Belews CBE - Appendix C_20200107

APPENDIX C
ENGINEERING EVALUATIONS AND ANALYSES

APPENDIX Cl
STORMWATER

ASCOM
Job
Description
Duke Energy — Belews Creek Closure Project No. 60603274 Sheet 1 of 6
Stormwater Management Plan
Computed by KDO Date 9/10/19
Checked by AN/HR Date 9/18/19
The purpose of this analysis is to demonstrate the stormwater management plan for Belews
Creek Ash Basin closure design meets the required North Carolina Department of
Environmental Quality (NCDEQ) and Duke Energy (Duke) design criteria. It is important to note,
Duke design criteria satisfies or exceeds the NCDEQ requirements. This stormwater
management calculation package will address the post closure stormwater attenuation and
impacts to existing downstream infrastructure.
This calculation package does not address erosion and sediment control during construction, or
the design of channels and culverts associated with the landfill. Construction related erosion
and sediment control will be addressed during the detailed design phase of the ash basin
closure. In addition, a detailed stormwater management system design will be developed for
the proposed CCR landfill as part of its permit design, and hence not addressed herein.
I. SITE AND PROJECT DESCRIPTION
Belews Creek Ash Basin is located north and west of Pine Hall Road and south and east of
Middleton Loop Road. The Ash Basin is part of the Dan River watershed. An unnamed tributary is
located downstream of the Ash Basin and channels surface water flows to the Dan River. The
unnamed tributary is hereon referred to as Tributary 52 to mimic the Federal Emergency
Management Agency (FEMA) nomenclature. Belews Creek Ash Basin has a drainage area of 670
acres to the Main Dam (State Dam ID Stoke-116). The land use outside the Ash Basin footprint
primarily consists of forested areas, industrial development, and vegetated farmland.
According to the United States Department of Agriculture (USDA) Natural Resources Conservation
Service's (NRCS) Web Soil Survey (WSS), the Tributary 52 watershed outside of the influence of
settled ash in the Ash Basin and adjacent landfill caps has a hydraulic soil group of approximately
60% C and 40% B.
The Ash Basin closure project will consist of (1) removing the free water from the Ash Basin, (2)
excavating and placing the existing in -place coal combustion residual (CCR) (also referred to as
"ash") to create a landfill located within the ash basin footprint, and (3) attenuating stormwater
runoff to prevent impacts to Tributary 52, North Carolina Department of Transportation
(NCDOT) Middleton Loop Road culvert, and Norfolk Southern (NS) railroad culvert downstream
of the closed Ash Basin.
The stormwater management system for this closure project relies on the construction of the
detention and retention basins to attenuate storm flows. The following sections summarize the
design criteria, procedures, assumptions, and results of the design of the stormwater management
system.
Belews Creek Basin Design Memo

ASCOM
Job
Description
Duke Energy — Belews Creek Closure Project No. 60603274 Sheet 2 of 6
Stormwater Management Plan
II. DESIGN CRITERIA
Computed by KDO Date 9/10/19
Checked by AN/HR Date 9/18/19
The design criteria for the Ash Basin closure design is to meet or exceed the requirements set
forth by the NCDEQ solid waste guidelines. The Belews Creek closure design is a closure -by -
removal method and will result in the partial removal of the Ash Basin Main Dam. The Pine Hall
Road Embankment will not be impounding water following this. Therefore, solid waste rules
govern the design of the stormwater management system. The design storm set forth by the
NCDEQ solid waste guidelines is the 25 year, 24 hour average recurrence synthetic design storm
(25yr storm) for all surface water components. Furthermore, when evaluating downstream
impacts to the Middleton Loop Road and NS railroad culverts the 100yr storm was used. The
100yr storm is the design criteria set forth by NS Public Projects Manual effective August 1,
2015. The design criteria set forth by NCDOT Guidelines for Drainage Studies and Hydraulic
Design effective November 21, 2016, Table 7-1 Design Frequency is the 25yr storm, however
due to unknown tailwater effects by the Dan River, the 100yr storm was used for both culvert
evaluations. The 100yr tailwater is established by FEMA Flood Insurance Rate Map, NC, Panel
6982.
Detention Basin Design Criteria
The proposed Ash Basin closure design includes the establishment of a detention basin located
within the existing Ash Basin footprint, prior to breaching the existing dam. The detention basin
will attenuate post construction stormwater runoff to not exceed pre -Ash Basin (pre -
development) peak discharge rates for the 100yr storm. The detention basin is created by
installing an approximately 26 foot tall earthen berm. The embankment is not intended to hold
water during dry weather conditions and a bottomless culvert will be utilized to attenuate peak
stormwater discharge rates below pre -development conditions along Tributary 52. Pre -
development conditions refer to pre -ash basin and pre -dam conditions and are different from
existing conditions. It is not possible to limit post -closure downstream flows to be less than
existing conditions as the dam will be removed. At this level of conceptual design for permitting
purposes, it is unknown if the detention basin will be classified as a regulated dam by NCDEQ
due to the retention basin located downstream, therefore a conservative approach was taken
and the detention basin was designed to route the 100yr storm through the structures primary
spillway without activating the emergency spillway, corresponding to a small intermediate
(Class B) hazard dam according to North Carolina Administrative Code Subchapter 2K and the
North Carolina Dam Safety Law of 1967. For the definition of the 100yr storm, see section IV.
Retention Basin Design Criteria
The proposed Ash Basin closure design includes the establishment of a retention basin located
where the existing ash basin main dam crosses the historical stream, after the dam is breached.
Belews Creek Basin Design Memo

ASCOM
Job
Description
IV.
Duke Energy — Belews Creek Closure Project No. 60603274 Sheet 3 of 6
Stormwater Management Plan
Computed by KDO Date 9/10/19
Checked by AN/HR Date 9/18/19
The retention basin will create a permanent pool of water to allow suspended solids collected
by stormwater runoff to settle prior to discharging to Tributary 52. The retention basin is
created by installing an approximately 31 foot tall embankment near the toe of the
downstream side of the main dam. A riser structure will be utilized to maintain and control the
normal water elevation within the permanent pool as well as route the 100yr storm to
Tributary 52 without activating the emergency spillway. Based on a design maximum height of
33.56 feet, the permanent pool within the retention basin will have an approximate height of
8.75 feet above the downstream toe of the dam.
PROCEDURE
Historical grades, as well as a conceptual landfill grading plan, located within the ash basin
footprint were used to establish a stormwater management plan. The stormwater management
plan was used to analyze and design (1) onsite detention basin, (2) onsite retention basin, and
(3) impacts to Tributary 52 and downstream existing infrastructure.
HydroCAD (Version 10.00-20) modeling software was used to conduct the hydrologic and
hydraulic calculations for this analysis with design inputs based on the drainage areas, runoff
curve numbers, rainfall data, and other design assumptions in accordance with NCRS hydrologic
and hydraulic design criteria.
The model was used to generate peak water surface elevations at both the detention and
retention basins, as well as design and analyze the proposed detention basin and downstream
impacts to Tributary 52 and its associated appurtenances.
NOTES/ASSUMPTIONS
The following is a list of key notes and assumptions made in completing this analysis.
Cover system basin design
• Runoff Method: SCS TR-20
• Reach Routing Method: Storage-indication+translation method
• Pond Routing Method: Storage -indication method
• 24 hour Design Storm Distribution: Type II
• 24 hour Rainfall Depth Source: NOAA Atlas 14 Point Precipitation Frequency Estimates
• 100 year, 24 hour Rainfall Depth: 7.94 inches
• Time of Concentration: TR-55 Segmental Method
Belews Creek Basin Design Memo

ASCOM
Job
Description
Duke Energy — Belews Creek Closure Project No. 60603274 Sheet 4 of 6
Stormwater Management Plan
Computed by KDO Date 9/10/19
Checked by AN/HR Date 9/18/19
• Runoff curve numbers (CN): In accordance with Natural Resource Conservation Services
(NRCS) Curve Number Description
o 80 for the existing and proposed landfill cover due to grass cover and assumed
hydraulic soil group D.
V. SUMMARY OF RESULTS
Detention Basin
The detention basin has been designed to route the runoff from the 100yr storm through the
primary spillway while maintaining a minimum of 1 foot of freeboard. The 1 foot of freeboard is
compliant with the Duke programmatic criteria, but the NC Dam Safety Rules require that wave
action be considered for design floods not based upon the PMP to demonstrate no overtopping
will occur. Wave action has not been analyzed at this time though using 1 foot of freeboard is
anticipated to be adequate based on the size of the pond, but should be confirmed as part of a
detailed design process. The primary spillway is designed to control runoff from the 100 year
storm without activating the emergency spillway.
Additionally, the detention basin attenuates the peak 100yr runoff to under pre -development
conditions. This attenuation mitigates the impacts to Tributary 52 and its associated
appurtenances including the Middleton Loop Road and NS railroad culverts when compared to
the baseline pre -development conditions (i.e. pre -ash basin and pre -dam).
Retention Basin
The retention basin has been designed to maintain a permanent pool through the use of a riser
structure as its primary spillway. The runoff from the 100yr storm will be routed through this
primary spillway.
Additionally, the retention basin attenuates the peak 100yr runoff to under pre -development
conditions while maintaining a minimum of 1 foot of freeboard. This attenuation mitigates the
impacts to Tributary 52 and its associated appurtenances including the Middleton Loop Road
and NS railroad culverts when compared to the baseline pre -development conditions (i.e. pre -
ash basin and pre -dam).
For a summary of flows at various locations downstream of the ash basin, see Table 1 below. As
previously stated, it is not possible to maintain flows at or below existing conditions due to the
dam being breached. Therefore, pre -ash basin flows were used as the maximum allowable
flows.
Belews Creek Basin Design Memo

ASCOM
Job
Description
Duke Energy — Belews Creek Closure
Stormwater Management Plan
Project No.
60603274
Sheet
5 of 6
Computed by
KDO
Date
9/10/19
Checked by
AN/HR
Date
9/18/19
Table 1: Stormwater Runoff Summary Table
Pre Ash
Closure By Excavation and
Existing
Basin
Dam Breach with Detention
Conditions
(CN:61)
and Retention Basins
0031
1117
322
688
Qioo, Cfs
MLR 2
1281
528
855
RR
1166
437
759
Footnotes
1 003 = NPDES Outfall 003
z MLR = Middleton Loop Road
3 RR = Norfolk Southern Rail Road
VI. CONCLUSIONS
The proposed Ash Basin closure design meets or exceeds the requirements set forth by NCDEQ,
as well as additional Duke design criteria. The detention and retention basins are designed to
attenuate the peak 100yr storm discharge rates below pre -development conditions to eliminate
the potential of downstream impacts (i.e. pre -ash basin and pre -dam).
Additional design work will be conducted related to the structural designs of the stormwater
management system, especially related to the detention and retention basins. The design
shown for the detention and retention basins are conceptual at this time. These two structures
are not directly part of the ash basin closure structure from a regulatory aspect, and therefore,
additional refinement will be pursued separately prior to construction. Furthermore, detailed
design of landfill and associated channels and culverts will be performed at a later stage.
Belews Creek Basin Design Memo

ASCOM
Job Duke Energy — Belews Creek Closure Project No. 60603274 Sheet 6 of 6
Description Stormwater Management Plan Computed by KDO Date 9/10/19
Checked by AN/HR Date 9/18/19
VII. ATTACHMENTS
Figures:
Figure 1: Final Surface Water Management
Figure 2: Final Surface Water Management
Attachments:
Attachment A: HydroCAD Calculations for Basin Design
A-1: Pre Ash Basin 100yr storm
A-2: Existing Conditions 100yr storm
A-3: Post development 100yr storm
Belews Creek Basin Design Memo

Figures
Final Surface Water Management
Belews Creek Basin Design Memo

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P:\PROJECTS2\60603274_BELEWS_CREEK\900_CAD_GIS\910_CAD\05_MODELS\CIVIL\X-SURFACE WATER MANAGEMENT PLAN.DWG 9/26/2019 1105:12 AV--,- ��^'i��� `\\\\\ \ 'I (\ \�M-N!ll�j1
0 1 2 3 1 TENTHS 10 20 30 1
1
1
40 LEGEND
/ CCR UNIT BOUNDARY (APPROXIMATE)
— — — — — — — EXISTING SITE FEATURE (APPROXIMATE)
-� DUKE ENERGY PROPERTY BOUNDARY
EXISTING MINOR CONTOUR (5 FT)
EXISTING MAJOR CONTOUR (25 FT)
PROPOSED DAM BREACH MINOR CONTOUR (5 FT)
PROPOSED DAM BREACH MAJOR CONTOUR (25 FT)
�._ FLOW ARROW
PERMANENT POOL SURFACE WATER
PEAK WATER SURFACE ELEVATION
FOR 100-YR, 24-HR STORM EVENT
POTENTIAL SURFACE WATER DIVERSION DITCH
WETLANDS
NOTE
1. PROPOSED STORMWATER BASIN DESIGN IS CONCEPTUAL AND WILL
NEED DETAILED DESIGN AS PART OF DAM MODIFICATION AND
DECOMMISSIONING PLAN APPLICAITON.
2. ADDITIONAL STREAM RESTORATION, STORMWATER CHANNEL, AND
CULVERT DESIGN MAY BE REQUIRED WITHIN AND OUTSIDE THE ASH
BASIN.
TITLE
0 500 1000 1500
GRAPHIC SCALE (IN FEET)
NOT FOR CONSTRUCTION
FINAL SURFACE WATER MANAGEMENT
BELEWS CREEK STEAM STATION
STOKES COUNTY, NORTH CAROLINA
FOR ISSUED FOR REVIEW
_
DUKE
ENERGY®
SCALE: ASSHOWN
DES: SD/KO
DWG TYPE:.DWG
DFTR: SD/KO
JOB NO: 60603274
CHKD: SD
[DATE. 09-18-2019
ENGR : KO
FILENAME: X-SURFACE WATER MANAGEMENT PLAN.DWG
APPD: KK
DWG SIZE DRAWING NO. REVISION
ANSI D. O
N.C. ENGINEERING LICENSE NO. 22.0"x340" FIGURE 1
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I\ \ I I \ \------' //'/11" / /,�/ / / ' / //// 100 YR RUNOFF STORAGE VOLUME = 25.9 AC —FT / / / / / / / / ; / / / / / / / / / / / / / / / / / / / / / I I I I 1 ► \ \ ,\ \ \ \_ \ \\__, _,
I I I I \ \ / /i' /' / / / / / / / I / / / / / / / / , / , / / / / / / / / / / / / / / / , / / / / , / / / / , / , I \ \ 1 \ \ \ \ . \
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/ , , / / I ► I I 1 /; ,-/ / / ,/ l / , ' ,/// EMERGENCY SPILLWAY ELEVATION = 674 ? /// I / / / / / / / / / / / / / / / / / / / / / / / ; ; / / / / , / / / LANDFILL , y / I I / / , / / ,/ /,/ , l 1't I -1: \
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CCR UNIT BOUNDARY (APPROXIMATE)
— — — — — — — EXISTING SITE FEATURE (APPROXIMATE)
--- DUKE ENERGY PROPERTY BOUNDARY
EXISTING MINOR CONTOUR (5 FT)
EXISTING MAJOR CONTOUR (25 FT)
PROPOSED DAM BREACH MINOR CONTOUR (5 FT)
PROPOSED DAM BREACH MAJOR CONTOUR (25 FT)
PERMANENT POOL SURFACE WATER
PEAK WATER SURFACE ELEVATION
FOR 100-YR, 24-HR STORM EVENT
POTENTIAL SURFACE WATER DIVERSION DITCH
.`.`+++'+ WETLANDS
NOTE
1. PROPOSED STORMWATER BASIN DESIGN IS CONCEPTUAL AND WILL
NEED DETAILED DESIGN AS PART OF DAM MODIFICATION AND
DECOMMISSIONING PLAN APPLICAITON.
2. ADDITIONAL STREAM RESTORATION, STORMWATER CHANNEL, AND
CULVERT DESIGN MAY BE REQUIRED WITHIN AND OUTSIDE THE ASH
BASIN.
TITLE
FOR
0 150 300 450
GRAPHIC SCALE (IN FEET)
NOT FOR CONSTRUCTION
FINAL SURFACE WATER MANAGEMENT
BELEWS CREEK STEAM STATION
STOKES COUNTY, NORTH CAROLINA
ISSUED FOR REVIEW
DUKE SCALE: AS SHOWN
tm*
DWG TYPE:.DWG
/ / / / , , // / / / \ \ \ \ \ \ \ \ \ `\ \ l / / / / ' / / / / / / / / / / / / ( / \ � / , / / I I / / / I , I / I / / / / / , / ' / , ,'- ' O JOB N0: 60603274
I / / / / / / /; / ,',' /' ,' / - \ \ \ \ \ \ \ \ \ \ `� `-_ - -'^\ , / / / / / / / / / / / / / / / / / / \ \ \ \ / I / / , / I / / / 1 / ' / / / / �' I I E N E R YR DATE: 09-18-2019
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\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ , , / , r , T/ �/ , , / , / , \ \ I DWG SIZE DRAWING NO.
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P:\PROJECTS2\60603274_BELEWS_CREEK\900_CAD_GIS\910_CAD\05_MODELS\CIVIL\X-SURFACE WATER MANAGEMENT BASIN INFORMATION.DWG 9/26/2019 11:08�37 AM \\�\\�\`\\\�`\\`\\\\�`\\\ `\ \ \\,\ \\ \,�\ `\\\�� \�� �` ` \ `\,`\\\\=-',/% / / /; /////// ///I,/ //; / �/ /Ij,/,1 ,//// //// ////;/ N.C. ENGINEERING LICENSENO. 22.0"x34.0" FIGURE 2
DES: SD/KO
DFTR : SD/KO
CHKD: SD
ENGR : KO
ff.VV45K
REVISION
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C1J

ATTACHMENT A-1
HydroCAD Calculations for Basin Design:
Pre Ash Basin 100yr storm
Belews Creek Basin Design Memo

F3OR
o Dan iver `
15
(14 DA 15
DA 14 29R Q-
13
12 RR Culv rt DA 13
DA 12
11
281] DA 11
DA 10 Road Cu vert
9
DA 9
77 R
6
Spillway utfall
DA 6
C)
DA7
F16R] '' (4�
v — 2
DA5
DA1
Subcat Reach on Link
DA4
15R
2
1
DA2

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 1: DA1
Runoff = 232.01 cfs @ 12.77 hrs, Volume= 40.493 af, Depth> 3.66"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
79.701
70
Woods, Good, HSG C
53.134
55
Woods, Good, HSG B
132.835
64
Weighted Average
132.835
100.00% Pervious Area
Tc Length
(min) (feet)
Slope
(ft/ft)
Velocity
(ft/sec)
Capacity Description
(cfs)
10.1 100
0.1263
0.16
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
59.9 3,746
0.0435
1.04
Shallow Concentrated Flow, Down sideslope
Woodland Kv= 5.0 fDs
70.0 3,846 Total
240
220
200
180
160
140
0 120
FL 100
80
60
40
20
0
Subcatchment 1: DA1
Hydrograph
232.01 cfs F7
Type-112"r
100 ears - 24 hrs, Rainf 11=7A"
Run�ff Are=132.835 a
Run�ff Volume=40.493�f
Runoff [Ye->3.66—
Flow-Length=3,46—
—
Tc=70.0 min
CN=44
- - 4-
7 7
7 -
I
rt I
I fi
L
I
L
— -
J-
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 3
Hydrograph for Subcatchment 1: DA1
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.01
9.50
1.29
0.00
0.10
9.75
1.36
0.01
0.33
10.00
1.44
0.02
0.75
10.25
1.52
0.03
1.35
10.50
1.62
0.04
2.15
10.75
1.73
0.06
3.23
11.00
1.87
0.09
4.68
11.25
2.03
0.13
6.66
11.50
2.25
0.19
9.46
11.75
3.07
0.50
14.12
12.00
5.26
1.75
31.16
12.25
5.61
1.99
95.00
12.50
5.84
2.15
190.94
12.75
6.00
2.26
231.80
13.00
6.13
2.36
209.55
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
156.46
13.50
6.34
2.51
115.27
13.75
6.43
2.58
87.94
14.00
6.51
2.63
68.98
14.25
6.58
2.69
55.86
14.50
6.65
2.74
46.41
14.75
6.72
2.79
39.68
15.00
6.78
2.83
34.88
15.25
6.83
2.88
31.42
15.50
6.89
2.92
28.81
15.75
6.94
2.96
26.52
16.00
6.99
2.99
24.72
16.25
7.03
3.03
23.25
16.50
7.08
3.06
21.83
16.75
7.12
3.09
20.62
17.00
7.16
3.12
19.59
17.25
7.20
3.15
18.76
17.50
7.24
3.18
18.11
17.75
7.28
3.21
17.50
18.00
7.31
3.24
16.97
18.25
7.35
3.27
16.46
18.50
7.38
3.29
15.94
18.75
7.41
3.32
15.46
19.00
7.45
3.34
14.96
19.25
7.48
3.37
14.47
19.50
7.50
3.39
13.98
19.75
7.53
3.41
13.48
20.00
7.56
3.43
12.99
20.25
7.58
3.45
12.49
20.50
7.61
3.47
12.00
20.75
7.64
3.49
11.58
21.00
7.66
3.51
11.22
21.25
7.68
3.53
10.98
21.50
7.71
3.55
10.79
21.75
7.73
3.57
10.64
22.00
7.76
3.59
10.53
22.25
7.78
3.61
10.40
22.50
7.80
3.63
10.31
22.75
7.83
3.64
10.21
23.00
7.85
3.66
10.10
23.25
7.87
3.68
10.02
23.50
7.90
3.70
9.91
23.75
7.92
3.72
9.82
24.00
7.94
3.73
9.73

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 2: DA2
Runoff = 271.54 cfs @ 12.57 hrs, Volume= 39.458 af, Depth> 3.68"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
77.289
70
Woods, Good, HSG C
51.526
55
Woods, Good, HSG B
128.815
64
Weighted Average
128.815
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
11.7 100
0.0881
0.14
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
42.5 2,510
0.0387
0.98
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
54.2 2,610 Total
300
250
MIN
3 150
0
U-
11'
50
1
Subcatchment 2: DA2
Hydrograph
271.54 cfs
Type II 24-11ir
100 years -24 hrs Rainf 11=7.9, "
Runoff Area=128.815 a�
Run?ff Volume=39.458 of
Runoff Depth>3.68"
Flo* Length=2,610'
Tc=54.2 min
CN=44
�— t
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 5
Hydrograph for Subcatchment 2: DA2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.03
9.50
1.29
0.00
0.20
9.75
1.36
0.01
0.58
10.00
1.44
0.02
1.15
10.25
1.52
0.03
1.89
10.50
1.62
0.04
2.88
10.75
1.73
0.06
4.20
11.00
1.87
0.09
5.98
11.25
2.03
0.13
8.43
11.50
2.25
0.19
12.00
11.75
3.07
0.50
18.59
12.00
5.26
1.75
51.23
12.25
5.61
1.99
167.78
12.50
5.84
2.15
267.48
12.75
6.00
2.26
242.83
13.00
6.13
2.36
165.61
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
113.63
13.50
6.34
2.51
81.86
13.75
6.43
2.58
62.43
14.00
6.51
2.63
50.15
14.25
6.58
2.69
41.83
14.50
6.65
2.74
35.95
14.75
6.72
2.79
31.69
15.00
6.78
2.83
28.67
15.25
6.83
2.88
26.76
15.50
6.89
2.92
25.20
15.75
6.94
2.96
23.79
16.00
6.99
2.99
22.44
16.25
7.03
3.03
21.12
16.50
7.08
3.06
19.87
16.75
7.12
3.09
18.85
17.00
7.16
3.12
18.07
17.25
7.20
3.15
17.45
17.50
7.24
3.18
16.92
17.75
7.28
3.21
16.42
18.00
7.31
3.24
15.94
18.25
7.35
3.27
15.47
18.50
7.38
3.29
14.99
18.75
7.41
3.32
14.52
19.00
7.45
3.34
14.04
19.25
7.48
3.37
13.56
19.50
7.50
3.39
13.08
19.75
7.53
3.41
12.60
20.00
7.56
3.43
12.12
20.25
7.58
3.45
11.64
20.50
7.61
3.47
11.18
20.75
7.64
3.49
10.83
21.00
7.66
3.51
10.59
21.25
7.68
3.53
10.42
21.50
7.71
3.55
10.30
21.75
7.73
3.57
10.19
22.00
7.76
3.59
10.08
22.25
7.78
3.61
9.99
22.50
7.80
3.63
9.89
22.75
7.83
3.64
9.80
23.00
7.85
3.66
9.70
23.25
7.87
3.68
9.61
23.50
7.90
3.70
9.52
23.75
7.92
3.72
9.43
24.00
7.94
3.73
9.34

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 3: DA3
Runoff = 143.46 cfs @ 12.44 hrs, Volume= 18.316 af, Depth> 3.69"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
35.779
70 Woods, Good, HSG C
23.853
55 Woods, Good, HSG B
59.632
64 Weighted Average
59.632
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
24.9 100
0.0132
0.07
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
20.4 1,484
0.0587
1.21
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
45.3 1,584 Total
160
140
120
100
3
80
0
60
40
20
0
0
Subcatchment 3: DA3
Hydrograph
143.46 cfs
Type�ll 24-fir
100 ears - 24 hrs Rainfall=7.94"
Runoff ►ire';59.632 ac
Run�ff Volume=1�8.316 f
Runoff [Ye-pth—>3.69—
Flowl Length=1,584'
Tc=45.3 min
CN=64
L I
— t
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 7
Hydrograph for Subcatchment 3: DA3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.03
9.50
1.29
0.00
0.15
9.75
1.36
0.01
0.37
10.00
1.44
0.02
0.68
10.25
1.52
0.03
1.07
10.50
1.62
0.04
1.59
10.75
1.73
0.06
2.29
11.00
1.87
0.09
3.23
11.25
2.03
0.13
4.55
11.50
2.25
0.19
6.52
11.75
3.07
0.50
10.49
12.00
5.26
1.75
34.26
12.25
5.61
1.99
111.51
12.50
5.84
2.15
141.08
12.75
6.00
2.26
99.72
13.00
6.13
2.36
62.21
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
41.91
13.50
6.34
2.51
30.56
13.75
6.43
2.58
24.07
14.00
6.51
2.63
19.91
14.25
6.58
2.69
17.01
14.50
6.65
2.74
14.80
14.75
6.72
2.79
13.51
15.00
6.78
2.83
12.61
15.25
6.83
2.88
11.91
15.50
6.89
2.92
11.26
15.75
6.94
2.96
10.65
16.00
6.99
2.99
10.04
16.25
7.03
3.03
9.45
16.50
7.08
3.06
8.89
16.75
7.12
3.09
8.48
17.00
7.16
3.12
8.17
17.25
7.20
3.15
7.92
17.50
7.24
3.18
7.69
17.75
7.28
3.21
7.47
18.00
7.31
3.24
7.25
18.25
7.35
3.27
7.04
18.50
7.38
3.29
6.82
18.75
7.41
3.32
6.60
19.00
7.45
3.34
6.38
19.25
7.48
3.37
6.16
19.50
7.50
3.39
5.94
19.75
7.53
3.41
5.71
20.00
7.56
3.43
5.49
20.25
7.58
3.45
5.26
20.50
7.61
3.47
5.07
20.75
7.64
3.49
4.93
21.00
7.66
3.51
4.84
21.25
7.68
3.53
4.78
21.50
7.71
3.55
4.73
21.75
7.73
3.57
4.68
22.00
7.76
3.59
4.64
22.25
7.78
3.61
4.60
22.50
7.80
3.63
4.56
22.75
7.83
3.64
4.51
23.00
7.85
3.66
4.47
23.25
7.87
3.68
4.43
23.50
7.90
3.70
4.39
23.75
7.92
3.72
4.34
24.00
7.94
3.73
4.30

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 8
Summary for Subcatchment 4: DA4
Runoff = 164.24 cfs @ 12.42 hrs, Volume= 20.365 af, Depth> 3.69"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
39.758
70
Woods, Good, HSG C
26.505
55
Woods, Good, HSG B
66.263
64
Weighted Average
66.263
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
13.4 100
0.0622
0.12
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
29.9 2,054
0.0525
1.15
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
43.3 2,154 Total
160
` 11
120
100
0 80
u-
60
,M
20
0L
0
Subcatchment 4: DA4
Hydrograph
164.24 cfs
Type�ll 24lir
100 years -24 hrs Rai nfall=7.94"
Runoff Area=66.263 ac
Run�ff Volume=20.365 of
f
Runoff Depth>3.69"
Flout Length=�154'
f
Tc=43.3 min
C N b-4
t
_ t
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 9
Hydrograph for Subcatchment 4: DA4
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.03
9.50
1.29
0.00
0.18
9.75
1.36
0.01
0.44
10.00
1.44
0.02
0.79
10.25
1.52
0.03
1.24
10.50
1.62
0.04
1.84
10.75
1.73
0.06
2.64
11.00
1.87
0.09
3.72
11.25
2.03
0.13
5.23
11.50
2.25
0.19
7.52
11.75
3.07
0.50
12.21
12.00
5.26
1.75
42.10
12.25
5.61
1.99
134.97
12.50
5.84
2.15
158.55
12.75
6.00
2.26
105.18
13.00
6.13
2.36
65.41
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
43.99
13.50
6.34
2.51
32.37
13.75
6.43
2.58
25.69
14.00
6.51
2.63
21.47
14.25
6.58
2.69
18.32
14.50
6.65
2.74
16.18
14.75
6.72
2.79
14.82
15.00
6.78
2.83
13.88
15.25
6.83
2.88
13.12
15.50
6.89
2.92
12.42
15.75
6.94
2.96
11.75
16.00
6.99
2.99
11.08
16.25
7.03
3.03
10.41
16.50
7.08
3.06
9.81
16.75
7.12
3.09
9.36
17.00
7.16
3.12
9.04
17.25
7.20
3.15
8.77
17.50
7.24
3.18
8.51
17.75
7.28
3.21
8.27
18.00
7.31
3.24
8.03
18.25
7.35
3.27
7.79
18.50
7.38
3.29
7.55
18.75
7.41
3.32
7.30
19.00
7.45
3.34
7.06
19.25
7.48
3.37
6.81
19.50
7.50
3.39
6.57
19.75
7.53
3.41
6.32
20.00
7.56
3.43
6.07
20.25
7.58
3.45
5.82
20.50
7.61
3.47
5.60
20.75
7.64
3.49
5.46
21.00
7.66
3.51
5.37
21.25
7.68
3.53
5.30
21.50
7.71
3.55
5.25
21.75
7.73
3.57
5.20
22.00
7.76
3.59
5.15
22.25
7.78
3.61
5.10
22.50
7.80
3.63
5.06
22.75
7.83
3.64
5.01
23.00
7.85
3.66
4.96
23.25
7.87
3.68
4.92
23.50
7.90
3.70
4.87
23.75
7.92
3.72
4.82
24.00
7.94
3.73
4.77

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 10
Summary for Subcatchment 5: DA5
Runoff = 126.63 cfs @ 12.54 hrs, Volume= 17.916 af, Depth> 3.68"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
35.071
70 Woods, Good, HSG C
23.381
55 Woods, Good, HSG B
58.452
64 Weighted Average
58.452
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
13.2 100
0.0648
0.13
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
39.0 2,495
0.0454
1.07
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
52.2 2,595 Total
140
120
100
80
3
�° 60
40
20
0
Subcatchment 5: DA5
Hydrograph
126.63 cfs
Type II 24-hr
100 years - 24 hrs Rainfall=7.94"
Runoff Area=58.452 ac
Runoff Volume=17.916 of
Runoff Depth>3.68"
Flow Length=2,595'
Tc=52.2 min
CN=64
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 11
Hydrograph for Subcatchment 5: DA5
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.02
9.50
1.29
0.00
0.10
9.75
1.36
0.01
0.28
10.00
1.44
0.02
0.55
10.25
1.52
0.03
0.90
10.50
1.62
0.04
1.36
10.75
1.73
0.06
1.98
11.00
1.87
0.09
2.81
11.25
2.03
0.13
3.95
11.50
2.25
0.19
5.64
11.75
3.07
0.50
8.80
12.00
5.26
1.75
24.98
12.25
5.61
1.99
82.51
12.50
5.84
2.15
126.10
12.75
6.00
2.26
108.73
13.00
6.13
2.36
71.89
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
49.18
13.50
6.34
2.51
35.47
13.75
6.43
2.58
27.18
14.00
6.51
2.63
21.96
14.25
6.58
2.69
18.40
14.50
6.65
2.74
15.88
14.75
6.72
2.79
14.02
15.00
6.78
2.83
12.83
15.25
6.83
2.88
12.02
15.50
6.89
2.92
11.34
15.75
6.94
2.96
10.71
16.00
6.99
2.99
10.10
16.25
7.03
3.03
9.51
16.50
7.08
3.06
8.95
16.75
7.12
3.09
8.50
17.00
7.16
3.12
8.16
17.25
7.20
3.15
7.88
17.50
7.24
3.18
7.64
17.75
7.28
3.21
7.42
18.00
7.31
3.24
7.20
18.25
7.35
3.27
6.99
18.50
7.38
3.29
6.78
18.75
7.41
3.32
6.56
19.00
7.45
3.34
6.34
19.25
7.48
3.37
6.13
19.50
7.50
3.39
5.91
19.75
7.53
3.41
5.69
20.00
7.56
3.43
5.48
20.25
7.58
3.45
5.26
20.50
7.61
3.47
5.05
20.75
7.64
3.49
4.89
21.00
7.66
3.51
4.79
21.25
7.68
3.53
4.72
21.50
7.71
3.55
4.66
21.75
7.73
3.57
4.62
22.00
7.76
3.59
4.57
22.25
7.78
3.61
4.53
22.50
7.80
3.63
4.48
22.75
7.83
3.64
4.44
23.00
7.85
3.66
4.40
23.25
7.87
3.68
4.36
23.50
7.90
3.70
4.32
23.75
7.92
3.72
4.27
24.00
7.94
3.73
4.23

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 12
Summary for Subcatchment 6: DA 6
Runoff = 142.54 cfs @ 12.11 hrs, Volume= 10.205 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
19.776
70 Woods, Good, HSG C
13.184
55 Woods, Good, HSG B
32.960
64 Weighted Average
32.960
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
13.4 100
0.0624
0.12
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
4.9 657
0.2014
2.24
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
18.3 757 Total
140
120
N 100
3
80
0
U- 60
40
20
0
0
Subcatchment 6: DA 6
Hydrograph
142.54 cfs
Type II 24-fir
100 years - 24 hrs Rainfall=7.94"
Runoff Area=32.960 ac
Runoff Vol} rne=10.205 of
Runoff Depth>1. 2"
Flo* Length=757,
Tc=18.3 min
CN=64
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 13
Hydrograph for Subcatchment 6: DA 6
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.01
9.25
1.23
0.00
0.11
9.50
1.29
0.00
0.29
9.75
1.36
0.01
0.47
10.00
1.44
0.02
0.72
10.25
1.52
0.03
1.05
10.50
1.62
0.04
1.50
10.75
1.73
0.06
2.09
11.00
1.87
0.09
2.94
11.25
2.03
0.13
4.16
11.50
2.25
0.19
6.32
11.75
3.07
0.50
16.68
12.00
5.26
1.75
100.53
12.25
5.61
1.99
94.37
12.50
5.84
2.15
35.22
12.75
6.00
2.26
19.61
13.00
6.13
2.36
14.48
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
12.07
13.50
6.34
2.51
10.54
13.75
6.43
2.58
9.29
14.00
6.51
2.63
8.28
14.25
6.58
2.69
7.42
14.50
6.65
2.74
6.97
14.75
6.72
2.79
6.63
15.00
6.78
2.83
6.31
15.25
6.83
2.88
5.99
15.50
6.89
2.92
5.66
15.75
6.94
2.96
5.33
16.00
6.99
2.99
5.00
16.25
7.03
3.03
4.69
16.50
7.08
3.06
4.52
16.75
7.12
3.09
4.40
17.00
7.16
3.12
4.28
17.25
7.20
3.15
4.17
17.50
7.24
3.18
4.05
17.75
7.28
3.21
3.93
18.00
7.31
3.24
3.81
18.25
7.35
3.27
3.69
18.50
7.38
3.29
3.57
18.75
7.41
3.32
3.45
19.00
7.45
3.34
3.32
19.25
7.48
3.37
3.20
19.50
7.50
3.39
3.08
19.75
7.53
3.41
2.95
20.00
7.56
3.43
2.83
20.25
7.58
3.45
2.71
20.50
7.61
3.47
2.67
20.75
7.64
3.49
2.64
21.00
7.66
3.51
2.62
21.25
7.68
3.53
2.60
21.50
7.71
3.55
2.57
21.75
7.73
3.57
2.55
22.00
7.76
3.59
2.53
22.25
7.78
3.61
2.50
22.50
7.80
3.63
2.48
22.75
7.83
3.64
2.46
23.00
7.85
3.66
2.43
23.25
7.87
3.68
2.41
23.50
7.90
3.70
2.38
23.75
7.92
3.72
2.36
24.00
7.94
3.73
2.34

Pre Ash Basin Type 1124-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 14
Summary for Subcatchment 7: DA7
Runoff = 638.42 cfs @ 12.23 hrs, Volume= 59.464 af, Depth> 3.70"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
115.573
70 Woods, Good, HSG C
77.049
55 Woods, Good, HSG B
192.622
64 Weighted Average
192.622
100.00% Pervious Area
Tc
Length
Slope
Velocity Capacity
Description
(min)
(feet)
(ft/ft)
(ft/sec) (cfs)
12.4
100
0.0762
0.13
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
15.4
2,866
0.0369
3.09
Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
0.5
1,430
0.0410
47.03278,600.50
Trap/Vee/Rect Channel Flow,
Bot.W=24.00' D=35.60' Z= 4.0 '/' Top.W=308.80'
n= 0.045
28.3 4,396 Total
700
600
500
400
3
�° 300
200
100
0
Subcatchment 7: DA7
Hydrograph
638.42 cfs
Type II 24-hr
100 years - 24 hrs Rainfall=7.94"
Runoff Area=192.622 ac
Runoff Volume=59.464 of
Runoff Depth>3.70"
Flow Length=4,396'
Tc=28.3 min
CN=64
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 15
Hydrograph for Subcatchment 7: DA7
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.01
9.25
1.23
0.00
0.30
9.50
1.29
0.00
1.10
9.75
1.36
0.01
2.10
10.00
1.44
0.02
3.34
10.25
1.52
0.03
4.99
10.50
1.62
0.04
7.20
10.75
1.73
0.06
10.12
11.00
1.87
0.09
14.21
11.25
2.03
0.13
19.97
11.50
2.25
0.19
29.50
11.75
3.07
0.50
56.38
12.00
5.26
1.75
287.86
12.25
5.61
1.99
635.69
12.50
5.84
2.15
349.68
12.75
6.00
2.26
182.48
13.00
6.13
2.36
113.42
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
84.17
13.50
6.34
2.51
68.20
13.75
6.43
2.58
59.11
14.00
6.51
2.63
52.21
14.25
6.58
2.69
46.53
14.50
6.65
2.74
42.58
14.75
6.72
2.79
40.12
15.00
6.78
2.83
38.10
15.25
6.83
2.88
36.18
15.50
6.89
2.92
34.27
15.75
6.94
2.96
32.35
16.00
6.99
2.99
30.41
16.25
7.03
3.03
28.50
16.50
7.08
3.06
27.10
16.75
7.12
3.09
26.21
17.00
7.16
3.12
25.47
17.25
7.20
3.15
24.77
17.50
7.24
3.18
24.08
17.75
7.28
3.21
23.39
18.00
7.31
3.24
22.69
18.25
7.35
3.27
21.99
18.50
7.38
3.29
21.28
18.75
7.41
3.32
20.57
19.00
7.45
3.34
19.86
19.25
7.48
3.37
19.14
19.50
7.50
3.39
18.42
19.75
7.53
3.41
17.69
20.00
7.56
3.43
16.96
20.25
7.58
3.45
16.26
20.50
7.61
3.47
15.79
20.75
7.64
3.49
15.55
21.00
7.66
3.51
15.39
21.25
7.68
3.53
15.25
21.50
7.71
3.55
15.12
21.75
7.73
3.57
14.98
22.00
7.76
3.59
14.85
22.25
7.78
3.61
14.71
22.50
7.80
3.63
14.57
22.75
7.83
3.64
14.44
23.00
7.85
3.66
14.30
23.25
7.87
3.68
14.16
23.50
7.90
3.70
14.02
23.75
7.92
3.72
13.88
24.00
7.94
3.73
13.74

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 16
Summary for Subcatchment 9: DA 9
Runoff = 249.24 cfs @ 12.19 hrs, Volume= 21.439 af, Depth> 3.71"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
41.628
70 Woods, Good, HSG C
27.752
55 Woods, Good, HSG B
69.380
64 Weighted Average
69.380
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
11.0 100
0.1018
0.15
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
14.0 1,342
0.1020
1.60
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
25.0 1,442 Total
250
200
150
3
_o
" 100
50
0
Subcatchment 9: DA 9
Hydrograph
249.24 cfs
Type II 24-hr
100 years - 24 hrs Rainfall=7.94"
Runoff Area=69.380 ac
Runoff Volume=21.439 of
Runoff Depth>3.71"
Flow Length=1,442'
Tc=25.0 min
CN=64
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 17
Hydrograph for Subcatchment 9: DA 9
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.14
9.50
1.29
0.00
0.46
9.75
1.36
0.01
0.83
10.00
1.44
0.02
1.30
10.25
1.52
0.03
1.93
10.50
1.62
0.04
2.77
10.75
1.73
0.06
3.88
11.00
1.87
0.09
5.45
11.25
2.03
0.13
7.66
11.50
2.25
0.19
11.42
11.75
3.07
0.50
23.54
12.00
5.26
1.75
129.85
12.25
5.61
1.99
236.15
12.50
5.84
2.15
108.28
12.75
6.00
2.26
56.34
13.00
6.13
2.36
36.54
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
28.03
13.50
6.34
2.51
23.61
13.75
6.43
2.58
20.66
14.00
6.51
2.63
18.32
14.25
6.58
2.69
16.36
14.50
6.65
2.74
15.08
14.75
6.72
2.79
14.27
15.00
6.78
2.83
13.57
15.25
6.83
2.88
12.89
15.50
6.89
2.92
12.20
15.75
6.94
2.96
11.51
16.00
6.99
2.99
10.81
16.25
7.03
3.03
10.13
16.50
7.08
3.06
9.67
16.75
7.12
3.09
9.38
17.00
7.16
3.12
9.12
17.25
7.20
3.15
8.87
17.50
7.24
3.18
8.62
17.75
7.28
3.21
8.37
18.00
7.31
3.24
8.12
18.25
7.35
3.27
7.87
18.50
7.38
3.29
7.61
18.75
7.41
3.32
7.36
19.00
7.45
3.34
7.10
19.25
7.48
3.37
6.84
19.50
7.50
3.39
6.58
19.75
7.53
3.41
6.32
20.00
7.56
3.43
6.06
20.25
7.58
3.45
5.81
20.50
7.61
3.47
5.66
20.75
7.64
3.49
5.59
21.00
7.66
3.51
5.53
21.25
7.68
3.53
5.48
21.50
7.71
3.55
5.44
21.75
7.73
3.57
5.39
22.00
7.76
3.59
5.34
22.25
7.78
3.61
5.29
22.50
7.80
3.63
5.24
22.75
7.83
3.64
5.19
23.00
7.85
3.66
5.14
23.25
7.87
3.68
5.09
23.50
7.90
3.70
5.04
23.75
7.92
3.72
4.99
24.00
7.94
3.73
4.94

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 18
Summary for Subcatchment 10: DA 10
Runoff = 112.70 cfs @ 12.08 hrs, Volume= 7.472 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
14.468
70
Woods, Good, HSG C
9.646
55
Woods, Good, HSG B
24.114
64
Weighted Average
24.114
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
9.9 100
0.1343
0.17
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
5.8 595
0.1187
1.72
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
15.7 695 Total
120
110
100
90
N 80
70
3 60
FZ 50
40
30
20
10
0
Subcatchment 10: DA 10
Hydrograph
112.70 cfs
Type�ll 24-fir
100- tears — 24-hrs Rainfatl=7 ,4"
Runoff Are=24.`IIU ac
Runoff Volume=7I.472 aft
Runoff Depth>3.72"
Flow-Length=695'
Tc=15.7 -min
CN=64
T T
T
T T
T
— T
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 19
Hydrograph for Subcatchment 10: DA 10
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.01
9.25
1.23
0.00
0.10
9.50
1.29
0.00
0.23
9.75
1.36
0.01
0.37
10.00
1.44
0.02
0.56
10.25
1.52
0.03
0.81
10.50
1.62
0.04
1.15
10.75
1.73
0.06
1.61
11.00
1.87
0.09
2.26
11.25
2.03
0.13
3.22
11.50
2.25
0.19
4.91
11.75
3.07
0.50
14.94
12.00
5.26
1.75
89.59
12.25
5.61
1.99
57.26
12.50
5.84
2.15
21.97
12.75
6.00
2.26
12.93
13.00
6.13
2.36
10.21
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
8.59
13.50
6.34
2.51
7.55
13.75
6.43
2.58
6.66
14.00
6.51
2.63
5.94
14.25
6.58
2.69
5.35
14.50
6.65
2.74
5.05
14.75
6.72
2.79
4.81
15.00
6.78
2.83
4.58
15.25
6.83
2.88
4.34
15.50
6.89
2.92
4.10
15.75
6.94
2.96
3.86
16.00
6.99
2.99
3.62
16.25
7.03
3.03
3.40
16.50
7.08
3.06
3.29
16.75
7.12
3.09
3.21
17.00
7.16
3.12
3.12
17.25
7.20
3.15
3.03
17.50
7.24
3.18
2.95
17.75
7.28
3.21
2.86
18.00
7.31
3.24
2.77
18.25
7.35
3.27
2.68
18.50
7.38
3.29
2.60
18.75
7.41
3.32
2.51
19.00
7.45
3.34
2.42
19.25
7.48
3.37
2.33
19.50
7.50
3.39
2.24
19.75
7.53
3.41
2.14
20.00
7.56
3.43
2.05
20.25
7.58
3.45
1.98
20.50
7.61
3.47
1.95
20.75
7.64
3.49
1.93
21.00
7.66
3.51
1.91
21.25
7.68
3.53
1.90
21.50
7.71
3.55
1.88
21.75
7.73
3.57
1.86
22.00
7.76
3.59
1.85
22.25
7.78
3.61
1.83
22.50
7.80
3.63
1.81
22.75
7.83
3.64
1.79
23.00
7.85
3.66
1.78
23.25
7.87
3.68
1.76
23.50
7.90
3.70
1.74
23.75
7.92
3.72
1.72
24.00
7.94
3.73
1.71

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 20
Summary for Subcatchment 11: DA 11
Runoff = 136.61 cfs @ 12.25 hrs, Volume= 13.221 af, Depth> 3.70"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
25.710
70 Woods, Good, HSG C
17.140
55 Woods, Good, HSG B
42.850
64 Weighted Average
42.850
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
11.4 100
0.0936
0.15
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
18.7 1,561
0.0776
1.39
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
30.1 1,661 Total
140
120
100
80
3
FL 60
40
20
0
0
Subcatchment 11: DA 11
Hydrograph
136.61 cfs
Type II 24-hr
100 years - 24 hrs-Rainfall=7 94"
Runoff Area=42.850 ac
Run?ff Volume=13.221 of
Runoff Depth>3.70"
FlovA(Length=1,661'
Tc=30.1 m i n
CN=64
F
fi
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 21
Hydrograph for Subcatchment 11: DA 11
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.06
9.50
1.29
0.00
0.22
9.75
1.36
0.01
0.44
10.00
1.44
0.02
0.71
10.25
1.52
0.03
1.07
10.50
1.62
0.04
1.54
10.75
1.73
0.06
2.18
11.00
1.87
0.09
3.06
11.25
2.03
0.13
4.30
11.50
2.25
0.19
6.31
11.75
3.07
0.50
11.69
12.00
5.26
1.75
57.05
12.25
5.61
1.99
136.60
12.50
5.84
2.15
83.59
12.75
6.00
2.26
43.89
13.00
6.13
2.36
26.89
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
19.57
13.50
6.34
2.51
15.68
13.75
6.43
2.58
13.38
14.00
6.51
2.63
11.79
14.25
6.58
2.69
10.49
14.50
6.65
2.74
9.56
14.75
6.72
2.79
8.99
15.00
6.78
2.83
8.53
15.25
6.83
2.88
8.09
15.50
6.89
2.92
7.67
15.75
6.94
2.96
7.24
16.00
6.99
2.99
6.81
16.25
7.03
3.03
6.38
16.50
7.08
3.06
6.06
16.75
7.12
3.09
5.85
17.00
7.16
3.12
5.68
17.25
7.20
3.15
5.53
17.50
7.24
3.18
5.38
17.75
7.28
3.21
5.22
18.00
7.31
3.24
5.06
18.25
7.35
3.27
4.91
18.50
7.38
3.29
4.75
18.75
7.41
3.32
4.60
19.00
7.45
3.34
4.44
19.25
7.48
3.37
4.28
19.50
7.50
3.39
4.12
19.75
7.53
3.41
3.95
20.00
7.56
3.43
3.79
20.25
7.58
3.45
3.63
20.50
7.61
3.47
3.52
20.75
7.64
3.49
3.47
21.00
7.66
3.51
3.43
21.25
7.68
3.53
3.40
21.50
7.71
3.55
3.37
21.75
7.73
3.57
3.34
22.00
7.76
3.59
3.31
22.25
7.78
3.61
3.28
22.50
7.80
3.63
3.25
22.75
7.83
3.64
3.21
23.00
7.85
3.66
3.18
23.25
7.87
3.68
3.15
23.50
7.90
3.70
3.12
23.75
7.92
3.72
3.09
24.00
7.94
3.73
3.06

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 22
Summary for Subcatchment 12: DA 12
Runoff = 4.92 cfs @ 12.08 hrs, Volume= 0.326 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
0.632
70 Woods, Good, HSG C
0.421
55 Woods, Good, HSG B
1.053
64 Weighted Average
1.053
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
13.3 100
0.0630
0.12
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
2.4 229
0.1036
1.61
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
15.7 329 Total
3
3
0
2
il
Subcatchment 12: DA 12
Hydrograph
4.92 cfs
Type II 24-hr
100 years - 24 hrs Rainfall=7.94"
Runoff Area=1.053 ac
Runoff Volume=0.326 of
Runoff Depth>3.72"
Flow Length=329'
Tc=15.7 min
CN=64
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 23
Hydrograph for Subcatchment 12: DA 12
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.00
9.50
1.29
0.00
0.01
9.75
1.36
0.01
0.02
10.00
1.44
0.02
0.02
10.25
1.52
0.03
0.04
10.50
1.62
0.04
0.05
10.75
1.73
0.06
0.07
11.00
1.87
0.09
0.10
11.25
2.03
0.13
0.14
11.50
2.25
0.19
0.21
11.75
3.07
0.50
0.65
12.00
5.26
1.75
3.91
12.25
5.61
1.99
2.50
12.50
5.84
2.15
0.96
12.75
6.00
2.26
0.56
13.00
6.13
2.36
0.45
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
0.38
13.50
6.34
2.51
0.33
13.75
6.43
2.58
0.29
14.00
6.51
2.63
0.26
14.25
6.58
2.69
0.23
14.50
6.65
2.74
0.22
14.75
6.72
2.79
0.21
15.00
6.78
2.83
0.20
15.25
6.83
2.88
0.19
15.50
6.89
2.92
0.18
15.75
6.94
2.96
0.17
16.00
6.99
2.99
0.16
16.25
7.03
3.03
0.15
16.50
7.08
3.06
0.14
16.75
7.12
3.09
0.14
17.00
7.16
3.12
0.14
17.25
7.20
3.15
0.13
17.50
7.24
3.18
0.13
17.75
7.28
3.21
0.12
18.00
7.31
3.24
0.12
18.25
7.35
3.27
0.12
18.50
7.38
3.29
0.11
18.75
7.41
3.32
0.11
19.00
7.45
3.34
0.11
19.25
7.48
3.37
0.10
19.50
7.50
3.39
0.10
19.75
7.53
3.41
0.09
20.00
7.56
3.43
0.09
20.25
7.58
3.45
0.09
20.50
7.61
3.47
0.09
20.75
7.64
3.49
0.08
21.00
7.66
3.51
0.08
21.25
7.68
3.53
0.08
21.50
7.71
3.55
0.08
21.75
7.73
3.57
0.08
22.00
7.76
3.59
0.08
22.25
7.78
3.61
0.08
22.50
7.80
3.63
0.08
22.75
7.83
3.64
0.08
23.00
7.85
3.66
0.08
23.25
7.87
3.68
0.08
23.50
7.90
3.70
0.08
23.75
7.92
3.72
0.08
24.00
7.94
3.73
0.07

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 24
Summary for Subcatchment 13: DA 13
Runoff = 37.71 cfs @ 12.04 hrs, Volume= 2.214 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
4.282
70 Woods, Good, HSG C
2.855
55 Woods, Good, HSG B
7.137
64 Weighted Average
7.137
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
7.3 100
0.2842
0.23
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
4.8 532
0.1367
1.85
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
12.1 632 Total
4
3
3
Subcatchment 13: DA 13
Hydrograph
37.71 cfs
Type II 24-h r
100 ears - 24 hrsl Rainf111=7.94 "
-Ruzff Are 7.13Zac
Run?ff Volume=2.214 of
-Runoff Depth->3.7
Flo* Length=632'I
Tc=12.1 min — — — — - - -
CN=64
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 25
Hydrograph for Subcatchment 13: DA 13
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.04
9.50
1.29
0.00
0.08
9.75
1.36
0.01
0.12
10.00
1.44
0.02
0.18
10.25
1.52
0.03
0.26
10.50
1.62
0.04
0.37
10.75
1.73
0.06
0.51
11.00
1.87
0.09
0.72
11.25
2.03
0.13
1.04
11.50
2.25
0.19
1.58
11.75
3.07
0.50
6.09
12.00
5.26
1.75
34.68
12.25
5.61
1.99
11.88
12.50
5.84
2.15
5.34
12.75
6.00
2.26
3.49
13.00
6.13
2.36
2.89
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
2.46
13.50
6.34
2.51
2.17
13.75
6.43
2.58
1.92
14.00
6.51
2.63
1.71
14.25
6.58
2.69
1.55
14.50
6.65
2.74
1.48
14.75
6.72
2.79
1.41
15.00
6.78
2.83
1.34
15.25
6.83
2.88
1.27
15.50
6.89
2.92
1.20
15.75
6.94
2.96
1.13
16.00
6.99
2.99
1.05
16.25
7.03
3.03
1.00
16.50
7.08
3.06
0.97
16.75
7.12
3.09
0.94
17.00
7.16
3.12
0.92
17.25
7.20
3.15
0.89
17.50
7.24
3.18
0.87
17.75
7.28
3.21
0.84
18.00
7.31
3.24
0.81
18.25
7.35
3.27
0.79
18.50
7.38
3.29
0.76
18.75
7.41
3.32
0.74
19.00
7.45
3.34
0.71
19.25
7.48
3.37
0.68
19.50
7.50
3.39
0.66
19.75
7.53
3.41
0.63
20.00
7.56
3.43
0.60
20.25
7.58
3.45
0.58
20.50
7.61
3.47
0.58
20.75
7.64
3.49
0.57
21.00
7.66
3.51
0.57
21.25
7.68
3.53
0.56
21.50
7.71
3.55
0.56
21.75
7.73
3.57
0.55
22.00
7.76
3.59
0.55
22.25
7.78
3.61
0.54
22.50
7.80
3.63
0.53
22.75
7.83
3.64
0.53
23.00
7.85
3.66
0.52
23.25
7.87
3.68
0.52
23.50
7.90
3.70
0.51
23.75
7.92
3.72
0.51
24.00
7.94
3.73
0.50

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 26
Summary for Subcatchment 14: DA 14
Runoff = 6.30 cfs @ 12.01 hrs, Volume= 0.341 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
0.660
70
Woods, Good, HSG C
0.440
55
Woods, Good, HSG B
1.100
64
Weighted Average
1.100
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
8.4 100
0.2027
0.20
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
1.3 80
0.0443
1.05
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
9.7 180 Total
7
6
5--
4-
2 3
U-
2
1
0
0
Subcatchment 14: DA 14
Hydrograph
6.30 cfs
Type II 24-hr
100 years - 24 hrsl Rainfa11=7.94"
Runoff Areaa=1.100 ac
Runoff Volume=0:341 of
Runoff Depth>3.72"
Flow Length=180'I
Tc=9.7 min
EN=64
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 27
Hydrograph for Subcatchment 14: DA 14
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.01
9.50
1.29
0.00
0.01
9.75
1.36
0.01
0.02
10.00
1.44
0.02
0.03
10.25
1.52
0.03
0.04
10.50
1.62
0.04
0.06
10.75
1.73
0.06
0.08
11.00
1.87
0.09
0.12
11.25
2.03
0.13
0.17
11.50
2.25
0.19
0.26
11.75
3.07
0.50
1.18
12.00
5.26
1.75
6.23
12.25
5.61
1.99
1.40
12.50
5.84
2.15
0.74
12.75
6.00
2.26
0.52
13.00
6.13
2.36
0.43
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
0.37
13.50
6.34
2.51
0.33
13.75
6.43
2.58
0.29
14.00
6.51
2.63
0.26
14.25
6.58
2.69
0.24
14.50
6.65
2.74
0.23
14.75
6.72
2.79
0.22
15.00
6.78
2.83
0.20
15.25
6.83
2.88
0.19
15.50
6.89
2.92
0.18
15.75
6.94
2.96
0.17
16.00
6.99
2.99
0.16
16.25
7.03
3.03
0.15
16.50
7.08
3.06
0.15
16.75
7.12
3.09
0.14
17.00
7.16
3.12
0.14
17.25
7.20
3.15
0.14
17.50
7.24
3.18
0.13
17.75
7.28
3.21
0.13
18.00
7.31
3.24
0.12
18.25
7.35
3.27
0.12
18.50
7.38
3.29
0.12
18.75
7.41
3.32
0.11
19.00
7.45
3.34
0.11
19.25
7.48
3.37
0.10
19.50
7.50
3.39
0.10
19.75
7.53
3.41
0.10
20.00
7.56
3.43
0.09
20.25
7.58
3.45
0.09
20.50
7.61
3.47
0.09
20.75
7.64
3.49
0.09
21.00
7.66
3.51
0.09
21.25
7.68
3.53
0.09
21.50
7.71
3.55
0.09
21.75
7.73
3.57
0.08
22.00
7.76
3.59
0.08
22.25
7.78
3.61
0.08
22.50
7.80
3.63
0.08
22.75
7.83
3.64
0.08
23.00
7.85
3.66
0.08
23.25
7.87
3.68
0.08
23.50
7.90
3.70
0.08
23.75
7.92
3.72
0.08
24.00
7.94
3.73
0.08

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 28
Summary for Subcatchment 15: DA 15
Runoff = 17.91 cfs @ 12.09 hrs, Volume= 1.208 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
2.339
70 Woods, Good, HSG C
1.559
55 Woods, Good, HSG B
3.898
64 Weighted Average
3.898
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
13.1 100
0.0654
0.13
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
3.2 208
0.0462
1.07
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
M011-311111111[*M.
2
1
1
1
3 1
0
FL
Subcatchment 15: DA 15
Hydrograph
0--
17.91
cfs
8
Type) 1124-hr
6
0 arm 24-hrslRain
Runoff Are=3.898
1=7-4A"
4
ac
Run?ff Volume=1.208 of
2
-Runoff Depth>3.7
— — —
Flowl Length=308'I
c 16.3 min
8
CN14
6
4
-
—I -
-
2
-
0
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 29
Hydrograph for Subcatchment 15: DA 15
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.02
9.50
1.29
0.00
0.04
9.75
1.36
0.01
0.06
10.00
1.44
0.02
0.09
10.25
1.52
0.03
0.13
10.50
1.62
0.04
0.18
10.75
1.73
0.06
0.26
11.00
1.87
0.09
0.36
11.25
2.03
0.13
0.51
11.50
2.25
0.19
0.78
11.75
3.07
0.50
2.30
12.00
5.26
1.75
13.84
12.25
5.61
1.99
9.72
12.50
5.84
2.15
3.68
12.75
6.00
2.26
2.14
13.00
6.13
2.36
1.66
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
1.40
13.50
6.34
2.51
1.23
13.75
6.43
2.58
1.08
14.00
6.51
2.63
0.96
14.25
6.58
2.69
0.87
14.50
6.65
2.74
0.82
14.75
6.72
2.79
0.78
15.00
6.78
2.83
0.74
15.25
6.83
2.88
0.70
15.50
6.89
2.92
0.66
15.75
6.94
2.96
0.63
16.00
6.99
2.99
0.59
16.25
7.03
3.03
0.55
16.50
7.08
3.06
0.53
16.75
7.12
3.09
0.52
17.00
7.16
3.12
0.50
17.25
7.20
3.15
0.49
17.50
7.24
3.18
0.48
17.75
7.28
3.21
0.46
18.00
7.31
3.24
0.45
18.25
7.35
3.27
0.43
18.50
7.38
3.29
0.42
18.75
7.41
3.32
0.41
19.00
7.45
3.34
0.39
19.25
7.48
3.37
0.38
19.50
7.50
3.39
0.36
19.75
7.53
3.41
0.35
20.00
7.56
3.43
0.33
20.25
7.58
3.45
0.32
20.50
7.61
3.47
0.32
20.75
7.64
3.49
0.31
21.00
7.66
3.51
0.31
21.25
7.68
3.53
0.31
21.50
7.71
3.55
0.30
21.75
7.73
3.57
0.30
22.00
7.76
3.59
0.30
22.25
7.78
3.61
0.30
22.50
7.80
3.63
0.29
22.75
7.83
3.64
0.29
23.00
7.85
3.66
0.29
23.25
7.87
3.68
0.28
23.50
7.90
3.70
0.28
23.75
7.92
3.72
0.28
24.00
7.94
3.73
0.28

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 30
Summary for Reach 15R: 1
Inflow Area = 261.650 ac, 0.00% Impervious, Inflow Depth > 3.67" for 100 years - 24 hrs event
Inflow = 489.01 cfs @ 12.64 hrs, Volume= 79.951 of
Outflow = 488.72 cfs @ 12.66 hrs, Volume= 79.906 af, Atten= 0%, Lag= 1.0 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 6.65 fps, Min. Travel Time= 0.5 min
Avg. Velocity = 3.32 fps, Avg. Travel Time= 1.0 min
Peak Storage= 14,699 cf @ 12.65 hrs
Average Depth at Peak Storage= 2.20'
Bank -Full Depth= 25.63' Flow Area= 9,138.2 sf, Capacity= 251,265.09 cfs
Custom cross-section, Length= 200.0' Slope= 0.0267 T (104 Elevation Intervals)
Constant n= 0.045
Inlet Invert= 689.16', Outlet Invert= 683.82'
Offset Elevation Chan.Depth
(feet) (feet)
(feet)
234.50 705.00
0.00
282.04 699.37
5.63
361.70 693.69
11.31
457.53 679.37
25.63
470.80 679.37
25.63
587.16 689.38
15.62
657.34 692.40
12.60
941.48 699.37
5.63
1,026.55 705.00
0.00
Depth End Area Perim.
Storage
Discharge
(feet) (sq-ft) (feet)
(cubic -feet)
(cfs)
0.00 0.0 13.3
0
0.00
10.01 1,050.5 197.8
210,097
17,254.73
13.03 1,780.8 288.5
356,152
32,334.78
14.32 2,190.5 349.8
438,097
40,155.70
20.00 5,052.3 661.3
1,010,453
105,749.64
25.63 9,138.2 794.4
1,827,642
251,265.09

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 31
500
450
400
N 350
300
0 250
" 200
150
100
50
0
Reach 15R: 1
Hydrograph
488.72 cfs
Inflow Area=261.650 a�
Avg. Flow Depth�2.2 L I
Ma Vel= 6.6� fps 1
n=;04;)
L=200-.01 fi 1
s=o.02617 T-
Cajac=25I 2I 6 .09 cfs
1 I L I
L-111
-4 1 1
L I
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
Inflow
— Outflow

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 32
Hydrograph for Reach 15R: 1
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
689.16
0.00
0.50
0.00
0
689.16
0.00
1.00
0.00
0
689.16
0.00
1.50
0.00
0
689.16
0.00
2.00
0.00
0
689.16
0.00
2.50
0.00
0
689.16
0.00
3.00
0.00
0
689.16
0.00
3.50
0.00
0
689.16
0.00
4.00
0.00
0
689.16
0.00
4.50
0.00
0
689.16
0.00
5.00
0.00
0
689.16
0.00
5.50
0.00
0
689.16
0.00
6.00
0.00
0
689.16
0.00
6.50
0.00
0
689.16
0.00
7.00
0.00
0
689.16
0.00
7.50
0.00
0
689.16
0.00
8.00
0.00
0
689.16
0.00
8.50
0.00
0
689.16
0.00
9.00
0.00
0
689.16
0.00
9.50
0.30
26
689.17
0.25
10.00
1.89
179
689.22
1.73
10.50
5.03
486
689.32
4.74
11.00
10.66
936
689.45
10.32
11.50
21.46
1,506
689.59
20.76
12.00
82.40
3,858
690.05
75.72
12.50
458.42
13,954
691.29
451.13
13.00
375.16
12,152
691.11
381.79
13.50
197.13
7,578
690.59
200.99
14.00
119.13
5,243
690.27
120.94
14.50
82.37
4,008
690.08
83.30
15.00
63.54
3,332
689.96
63.99
15.50
54.01
2,970
689.90
54.32
16.00
47.15
2,682
689.84
47.41
16.50
41.71
2,453
689.79
41.92
17.00
37.66
2,281
689.76
37.78
17.50
35.03
2,170
689.74
35.11
18.00
32.91
2,082
689.72
32.99
18.50
30.94
1,999
689.70
31.02
19.00
29.00
1,918
689.69
29.08
19.50
27.07
1,837
689.67
27.15
20.00
25.11
1,732
689.65
25.20
20.50
23.19
1,627
689.62
23.27
21.00
21.81
1,552
689.60
21.86
21.50
21.09
1,512
689.59
21.11
22.00
20.61
1,486
689.58
20.63
22.50
20.20
1,464
689.58
20.22
23.00
19.81
1,443
689.57
19.84
23.50
19.43
1,422
689.57
19.45
24.00
19.06
1,402
689.56
19.08

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 33
Summary for Reach 16R: 2
Inflow Area = 445.997 ac, 0.00% Impervious, Inflow Depth > 3.67" for 100 years - 24 hrs event
Inflow = 885.03 cfs @ 12.55 hrs, Volume= 136.502 of
Outflow = 854.68 cfs @ 12.80 hrs, Volume= 135.393 af, Atten= 3%, Lag= 14.7 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 4.77 fps, Min. Travel Time= 8.4 min
Avg. Velocity = 2.66 fps, Avg. Travel Time= 15.1 min
Peak Storage= 431,430 cf @ 12.66 hrs
Average Depth at Peak Storage= 1.66'
Bank -Full Depth= 60.63' Flow Area= 28,198.4 sf, Capacity= 802,050.80 cfs
Custom cross-section, Length= 2,406.0' Slope= 0.0114 T (104 Elevation Intervals)
Constant n= 0.045
Inlet Invert= 683.82', Outlet Invert= 656.38'
Offset Elevation Chan.Depth
(feet) (feet)
(feet)
0.00 730.00
0.00
68.44 724.78
5.22
126.80 719.37
10.63
424.60 669.37
60.63
524.82 669.37
60.63
626.53 699.37
30.63
847.38 719.37
10.63
986.41 725.00
5.00
1,221.05 730.00
0.00
Depth End Area Perim.
Storage
Discharge
(feet) (sq-ft) (feet)
(cubic -feet)
(cfs)
0.00 0.0 100.2
0
0.00
30.00 7,212.4 387.4
17,353,155
178,655.60
50.00 18,224.3 730.0
43,847,786
548,986.52
55.41 22,641.9 922.3
54,476,489
674,462.61
55.63 22,843.6 930.6
54,961,714
680,414.00
60.63 28,198.4 1,231.1
67,845,269
802,050.80

Pre Ash Basin Type 1124-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 34
900
800
700
600
3 500
,° 400
300
200
100
0
Reach 16R: 2
Hydrograph
854.68 cfs
Infllow Area=1445.�97 a�
Avg. Flaw Dppth�1.661
Ma Vet 417 fps
n= . 451 1 —I
L=2,406�0'
S=�.011 I I
Capacity — 02;M"O cfs
-III �-4-
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
Inflow
— Outflow

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 35
Hydrograph for Reach 16R: 2
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
683.82
0.00
0.50
0.00
0
683.82
0.00
1.00
0.00
0
683.82
0.00
1.50
0.00
0
683.82
0.00
2.00
0.00
0
683.82
0.00
2.50
0.00
0
683.82
0.00
3.00
0.00
0
683.82
0.00
3.50
0.00
0
683.82
0.00
4.00
0.00
0
683.82
0.00
4.50
0.00
0
683.82
0.00
5.00
0.00
0
683.82
0.00
5.50
0.00
0
683.82
0.00
6.00
0.00
0
683.82
0.00
6.50
0.00
0
683.82
0.00
7.00
0.00
0
683.82
0.00
7.50
0.00
0
683.82
0.00
8.00
0.00
0
683.82
0.00
8.50
0.00
0
683.82
0.00
9.00
0.00
0
683.82
0.00
9.50
0.67
232
683.82
0.08
10.00
3.75
2,059
683.83
1.37
10.50
9.54
6,238
683.85
4.94
11.00
20.08
13,933
683.88
11.61
11.50
40.43
28,362
683.93
24.00
12.00
177.06
81,982
684.15
53.80
12.50
876.85
405,029
685.38
554.73
13.00
581.30
363,890
685.23
767.47
13.50
299.39
243,089
684.78
420.81
14.00
184.28
175,217
684.52
238.10
14.50
130.16
142,938
684.40
156.48
15.00
103.30
113,535
684.28
124.59
15.50
89.34
94,578
684.20
101.93
16.00
78.63
82,122
684.15
87.84
16.50
69.58
72,351
684.11
77.19
17.00
63.16
64,690
684.08
68.57
17.50
58.95
59,531
684.06
62.63
18.00
55.47
55,720
684.04
58.43
18.50
52.16
52,377
684.03
54.91
19.00
48.87
49,159
684.02
51.57
19.50
45.57
45,954
684.01
48.27
20.00
42.24
42,738
683.99
44.96
20.50
38.99
39,520
683.98
41.63
21.00
36.86
36,890
683.97
38.65
21.50
35.75
35,329
683.96
36.76
22.00
34.99
34,384
683.96
35.66
22.50
34.32
33,666
683.96
34.88
23.00
33.67
33,021
683.95
34.20
23.50
33.03
32,395
683.95
33.56
24.00
32.38
31,770
683.95
32.91

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 36
Summary for Reach 27R: Spillway Outfall
Inflow Area = 740.959 ac, 0.00% Impervious, Inflow Depth > 3.67" for 100 years - 24 hrs event
Inflow = 1,117.29 cfs @ 12.68 hrs, Volume= 226.501 of
Outflow = 1,114.18 cfs @ 12.75 hrs, Volume= 225.993 af, Atten= 0%, Lag= 4.3 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 9.49 fps, Min. Travel Time= 2.4 min
Avg. Velocity = 5.94 fps, Avg. Travel Time= 3.8 min
Peak Storage= 157,350 cf @ 12.71 hrs
Average Depth at Peak Storage= 3.95'
Bank -Full Depth= 94.66' Flow Area= 78,667.2 sf, Capacity= 6,461,392.31 cfs
Custom cross-section, Length= 1,338.8' Slope= 0.0303 T (112 Elevation Intervals)
Constant n= 0.040
Inlet Invert= 656.55', Outlet Invert= 615.97'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
74.42
700.66
0.00
168.56
695.66
5.00
283.63
671.68
28.98
442.63
620.00
80.66
514.29
610.00
90.66
733.65
611.99
88.67
754.40
606.24
94.42
764.63
606.00
94.66
771.19
608.00
92.66
843.45
612.00
88.66
1,316.83
682.00
18.66
1,444.58
690.00
10.66
1,552.47
688.51
12.15
1,647.76
678.00
22.66
1,658.48
678.00
22.66
1,792.16
700.66
0.00

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 37
Depth
End Area
Perim.
Storage Discharge
(feet)
(sq-ft)
(feet)
(cubic -feet) (cfs)
0.00
0.0
0.0
0 0.00
0.24
1.3
11.1
1,770 2.08
2.00
31.4
23.7
42,014 244.87
4.00
121.0
67.4
162,010 1,156.69
5.99
528.7
344.6
707,812 4,548.84
6.00
532.1
344.8
712,409 4,595.93
14.00
3,725.8
457.4
4,988,068 97,555.18
65.68
40,375.4
977.9
54,054,6443,119,567.13
72.00
46,695.1
1,062.8
62,515,3823,760,494.23
76.00
51,096.1
1,170.2
68,407,4474,098,013.65
82.51
59,361.3
1,404.6
79,472,9081,658,383.64
84.00
61,536.3
1,552.5
82,384,8164,626,837.94
89.66
70,387.6
1,614.1
94,234,8915,640,154.10
94.66
78,667.2
1,738.3
105,319,63C6,461,392.31
1,200
1,100
1,000
900
800
700
3 600
rL 500
400
300
200
100
0
Reach 27R: Spillway Outfall
Hydrograph
1,114.18 cfs
Infll w �ea=140.9�9 act
Avq. Flow Depth=�.95'
Max VeT 9.49 fps
n=0:0404
L=1,33 . ' �
S=0.03 '/' - -
Capacity=6,461,3913l cfs
T T
T
T
T
T
T T
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
- Inflow
- Outflow

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 38
Hydrograph for Reach 27R: Spillway Outfall
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
656.55
0.00
0.50
0.00
0
656.55
0.00
1.00
0.00
0
656.55
0.00
1.50
0.00
0
656.55
0.00
2.00
0.00
0
656.55
0.00
2.50
0.00
0
656.55
0.00
3.00
0.00
0
656.55
0.00
3.50
0.00
0
656.55
0.00
4.00
0.00
0
656.55
0.00
4.50
0.00
0
656.55
0.00
5.00
0.00
0
656.55
0.00
5.50
0.00
0
656.55
0.00
6.00
0.00
0
656.55
0.00
6.50
0.00
0
656.55
0.00
7.00
0.00
0
656.55
0.00
7.50
0.00
0
656.55
0.00
8.00
0.00
0
656.55
0.00
8.50
0.00
0
656.55
0.00
9.00
0.02
2
656.55
0.00
9.50
1.92
775
656.66
0.75
10.00
6.74
2,704
656.84
5.38
10.50
16.40
4,898
656.96
13.85
11.00
34.22
8,941
657.19
29.47
11.50
71.24
16,434
657.57
62.75
12.00
572.04
74,433
659.30
352.84
12.50
1,047.90
149,117
660.40
1,042.63
13.00
931.91
139,789
660.28
994.71
13.50
523.16
87,357
659.52
567.36
14.00
316.92
55,646
658.87
341.95
14.50
221.10
39,614
658.47
231.21
15.00
182.58
33,861
658.25
188.32
15.50
154.07
29,527
658.08
157.89
16.00
134.05
26,521
657.97
136.97
16.50
118.47
24,172
657.87
120.60
17.00
107.45
22,510
657.81
109.01
17.50
99.38
21,293
657.76
100.53
18.00
93.06
20,350
657.73
94.01
18.50
87.37
19,511
657.69
88.27
19.00
81.85
18,699
657.66
82.74
19.50
76.35
17,890
657.63
77.23
20.00
70.81
17,077
657.60
71.70
20.50
65.74
16,317
657.57
66.45
21.00
62.19
15,780
657.55
62.68
21.50
59.88
15,427
657.53
60.19
22.00
58.37
15,198
657.52
58.59
22.50
57.17
15,020
657.52
57.36
23.00
56.07
14,857
657.51
56.25
23.50
55.00
14,700
657.50
55.17
24.00
53.93
14,542
657.50
54.10

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 39
Summary for Reach 28R: Road Culvert
Inflow Area = 807.923 ac, 0.00% Impervious, Inflow Depth > 3.66" for 100 years - 24 hrs event
Inflow = 1,280.73 cfs @ 12.29 hrs, Volume= 246.686 of
Outflow = 1,162.75 cfs @ 12.90 hrs, Volume= 244.896 af, Atten= 9%, Lag= 36.8 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 5.74 fps, Min. Travel Time= 7.3 min
Avg. Velocity = 3.41 fps, Avg. Travel Time= 12.3 min
Peak Storage= 624,558 cf @ 12.79 hrs
Average Depth at Peak Storage= 3.55'
Bank -Full Depth= 39.37' Flow Area= 11,690.1 sf, Capacity= 402,588.09 cfs
Custom cross-section, Length= 2,511.7' Slope= 0.0111 T (109 Elevation Intervals)
Constant n= 0.040
Inlet Invert= 615.97', Outlet Invert= 588.00'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
16.74
629.37
0.00
46.74
623.76
5.61
73.81
616.00
13.37
87.73
610.00
19.37
95.22
604.48
24.89
103.27
590.00
39.37
137.81
590.00
39.37
140.51
592.00
37.37
332.24
594.00
35.37
348.56
596.04
33.33
362.15
598.63
30.74
410.71
616.00
13.37
420.31
622.00
7.37
445.73
629.37
0.00

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 40
Depth
End Area
Perim.
Storage
Discharge
(feet)
(sq-ft)
(feet)
(cubic -feet)
(cfs)
0.00
0.0
34.5
0
0.00
2.00
72.9
40.2
183,083
425.00
4.00
342.4
234.2
860,100
1,729.33
6.04
831.9
253.0
2,089,423
7,211.20
8.63
1,495.3
269.8
3,755,840
18,359.59
14.48
3,095.2
293.9
7,774,219
58,305.65
20.00
4,722.2
319.6
11,860,740
111,480.77
26.00
6,651.5
352.5
16,706,610
184,811.49
32.00
8,764.5
385.6
22,013,810
275,694.39
33.76
9,421.9
398.3
23,665,058
304,365.07
39.37
11,690.1
449.0
29,362,117
402,588.09
1,400
1,200
1,000
N
800
3
�° 600
400
200
0
0
Reach 28R: Road Culvert
Hydrograph
1,280.73 cfs
Inflow Area=807.923 1,162.75 cfs
Avg. Flow Depth=3.55'
Max Vet=5.74 fps
n=0.040
L=2, 511.7'
S=0.0111 V,
Capacity=402,588.09 cfs
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
- Inflow
- Outflow

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 41
Hydrograph for Reach 28R: Road Culvert
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
615.97
0.00
0.50
0.00
0
615.97
0.00
1.00
0.00
0
615.97
0.00
1.50
0.00
0
615.97
0.00
2.00
0.00
0
615.97
0.00
2.50
0.00
0
615.97
0.00
3.00
0.00
0
615.97
0.00
3.50
0.00
0
615.97
0.00
4.00
0.00
0
615.97
0.00
4.50
0.00
0
615.97
0.00
5.00
0.00
0
615.97
0.00
5.50
0.00
0
615.97
0.00
6.00
0.00
0
615.97
0.00
6.50
0.00
0
615.97
0.00
7.00
0.00
0
615.97
0.00
7.50
0.00
0
615.97
0.00
8.00
0.00
0
615.97
0.00
8.50
0.00
0
615.97
0.00
9.00
0.01
1
615.97
0.00
9.50
1.20
500
615.98
0.19
10.00
6.65
3,959
616.02
2.16
10.50
16.55
12,398
616.11
8.14
11.00
34.80
28,012
616.29
19.27
11.50
73.98
51,314
616.55
47.23
12.00
499.48
152,571
617.65
154.99
12.50
1,148.19
623,150
619.52
1,119.50
13.00
1,031.80
597,661
619.46
1,152.28
13.50
590.59
402,397
618.96
794.01
14.00
359.68
243,333
618.37
484.52
14.50
245.82
135,243
617.47
292.76
15.00
201.43
116,502
617.27
218.74
15.50
169.66
104,973
617.14
182.06
16.00
147.40
95,407
617.04
157.38
16.50
129.95
87,697
616.95
137.63
17.00
117.81
82,228
616.89
123.22
17.50
108.85
78,232
616.85
112.83
18.00
101.85
75,181
616.82
105.05
18.50
95.62
72,545
616.79
98.53
19.00
89.59
70,035
616.76
92.43
19.50
83.59
66,981
616.73
86.88
20.00
77.55
63,562
616.69
80.93
20.50
71.92
60,215
616.65
74.94
21.00
68.03
57,700
616.62
70.12
21.50
65.44
55,993
616.60
66.80
22.00
63.74
54,885
616.59
64.65
22.50
62.41
54,073
616.58
63.14
23.00
61.21
53,368
616.57
61.88
23.50
60.03
52,695
616.57
60.69
24.00
58.87
52,028
616.56
59.52

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 42
Summary for Reach 29R: RR Culvert
Inflow Area = 816.113 ac, 0.00% Impervious, Inflow Depth > 3.64" for 100 years - 24 hrs event
Inflow = 1,166.32 cfs @ 12.90 hrs, Volume= 247.436 of
Outflow = 1,165.96 cfs @ 12.91 hrs, Volume= 247.332 af, Atten= 0%, Lag= 0.6 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 10.95 fps, Min. Travel Time= 0.4 min
Avg. Velocity = 5.56 fps, Avg. Travel Time= 0.7 min
Peak Storage= 25,836 cf @ 12.91 hrs
Average Depth at Peak Storage= 5.73'
Bank -Full Depth= 27.36' Flow Area= 3,723.4 sf, Capacity= 91,794.33 cfs
Custom cross-section, Length= 242.5' Slope= 0.0165 T (104 Elevation Intervals)
Constant n= 0.040
Inlet Invert= 584.00', Outlet Invert= 580.00'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
34.01
607.36
0.00
66.97
600.00
7.36
118.99
600.00
7.36
176.43
590.00
17.36
213.63
588.00
19.36
228.46
580.00
27.36
238.68
580.00
27.36
244.95
585.91
21.45
342.59
607.36
0.00
Depth End
Area Perim.
Storage
Discharge
(feet)
(sq-ft) (feet)
(cubic -feet)
(cfs)
0.00
0.0 10.2
0
0.00
5.91
111.3 31.3
26,991
1,237.62
8.00
182.7 45.4
44,294
2,203.63
10.00
310.6 92.0
75,327
3,335.52
20.00 1,696.8
248.9
411,474
29,104.81
27.36 3,723.4
317.0
902,916
91,794.33

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 43
3
0
FL
7
1
Reach 29R: RR Culvert
Hydrograph
1,165.96 cfs
1 1
1
nflo"rea�M.11-43 �c
L 1
--1
kvg- F40w-Dppth�4. 7� -t
t
-t
%apacty=9-1,M133 C#s
T 7 7
T
--1
0 2 4 6 8
10 12 14 16
Time (hours)
18 20 22 24
Inflow
— Outflow

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 44
Hydrograph for Reach 29R: RR Culvert
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
584.00
0.00
0.50
0.00
0
584.00
0.00
1.00
0.00
0
584.00
0.00
1.50
0.00
0
584.00
0.00
2.00
0.00
0
584.00
0.00
2.50
0.00
0
584.00
0.00
3.00
0.00
0
584.00
0.00
3.50
0.00
0
584.00
0.00
4.00
0.00
0
584.00
0.00
4.50
0.00
0
584.00
0.00
5.00
0.00
0
584.00
0.00
5.50
0.00
0
584.00
0.00
6.00
0.00
0
584.00
0.00
6.50
0.00
0
584.00
0.00
7.00
0.00
0
584.00
0.00
7.50
0.00
0
584.00
0.00
8.00
0.00
0
584.00
0.00
8.50
0.00
0
584.00
0.00
9.00
0.00
0
584.00
0.00
9.50
0.28
29
584.01
0.22
10.00
2.36
261
584.10
2.05
10.50
8.56
866
584.33
8.18
11.00
20.09
1,541
584.57
19.54
11.50
49.02
2,752
584.97
47.67
12.00
193.59
6,941
586.14
182.32
12.50
1,125.80
25,100
589.62
1,113.59
13.00
1,155.62
25,678
589.71
1,157.62
13.50
796.51
19,612
588.73
806.16
14.00
486.49
13,713
587.64
491.58
14.50
294.45
9,594
586.77
298.89
15.00
220.28
7,790
586.35
221.39
15.50
183.44
6,855
586.12
184.29
16.00
158.59
6,195
585.95
159.19
16.50
138.74
5,644
585.81
139.23
17.00
124.27
5,233
585.70
124.61
17.50
113.83
4,930
585.62
114.09
18.00
105.98
4,688
585.55
106.19
18.50
99.41
4,487
585.49
99.59
19.00
93.25
4,298
585.44
93.43
19.50
87.64
4,126
585.39
87.81
20.00
81.62
3,931
585.33
81.81
20.50
75.60
3,728
585.27
75.78
21.00
70.76
3,563
585.22
70.89
21.50
67.44
3,450
585.19
67.53
22.00
65.28
3,377
585.17
65.34
22.50
63.76
3,325
585.15
63.80
23.00
62.48
3,282
585.14
62.52
23.50
61.28
3,241
585.13
61.32
24.00
60.10
3,201
585.11
60.14

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 45
Summary for Reach 30R: To Dan River
Inflow Area = 821.111 ac, 0.00% Impervious, Inflow Depth > 3.64" for 100 years - 24 hrs event
Inflow = 1,168.20 cfs @ 12.91 hrs, Volume= 248.881 of
Outflow = 1,167.93 cfs @ 12.93 hrs, Volume= 248.729 af, Atten= 0%, Lag= 1.0 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 7.34 fps, Min. Travel Time= 0.6 min
Avg. Velocity = 3.98 fps, Avg. Travel Time= 1.1 min
Peak Storage= 41,117 cf @ 12.92 hrs
Average Depth at Peak Storage= 3.78'
Bank -Full Depth= 10.54' Flow Area= 1,563.4 sf, Capacity= 19,048.17 cfs
Custom cross-section, Length= 258.3' Slope= 0.0157 T (103 Elevation Intervals)
Constant n= 0.040
Inlet Invert= 583.01', Outlet Invert= 578.96'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
43.40
593.14
0.00
226.12
588.00
5.14
252.69
586.00
7.14
285.16
582.83
10.31
293.21
582.60
10.54
342.47
588.00
5.14
411.43
593.14
0.00
Depth End Area Perim.
Storage
Discharge
(feet)
(sq-ft) (feet)
(cubic -feet)
(cfs)
0.00
0.0 0.0
0
0.00
0.23
1.2 10.2
301
1.28
3.40
130.6 71.9
33,743
905.02
5.40
318.5 116.9
82,274
2,890.90
10.54 1,563.4
368.8
403,820
19,048.17

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 46
Reach 30R: To Dan River
Hydrograph
1,300
1,167.93 cfs
1,200
-
—
1,100
nfl0"rea�82-1.1141 �c - I
I
—i
1,000
Avg-. Row Dpptlh4 7� -
t
�
090 _7-34 #PS
N 800
700
=2-58-.4' I I
-
3 600
0
500
S=0.0 7 ' ' I
apaC y=491,� c#s
1
400
-4 1 I �-- I
-4
200
100
0
0
2 4 6 8 10 12 14 16
18
20
22 24
Time (hours)
Inflow
— Outflow

Pre Ash Basin Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 47
Hydrograph for Reach 30R: To Dan River
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
583.01
0.00
0.50
0.00
0
583.01
0.00
1.00
0.00
0
583.01
0.00
1.50
0.00
0
583.01
0.00
2.00
0.00
0
583.01
0.00
2.50
0.00
0
583.01
0.00
3.00
0.00
0
583.01
0.00
3.50
0.00
0
583.01
0.00
4.00
0.00
0
583.01
0.00
4.50
0.00
0
583.01
0.00
5.00
0.00
0
583.01
0.00
5.50
0.00
0
583.01
0.00
6.00
0.00
0
583.01
0.00
6.50
0.00
0
583.01
0.00
7.00
0.00
0
583.01
0.00
7.50
0.00
0
583.01
0.00
8.00
0.00
0
583.01
0.00
8.50
0.00
0
583.01
0.00
9.00
0.00
0
583.01
0.00
9.50
0.27
66
583.12
0.16
10.00
2.16
385
583.27
1.84
10.50
8.43
1,043
583.47
7.87
11.00
20.01
1,961
583.68
19.06
11.50
48.71
3,766
584.00
46.57
12.00
202.39
10,599
584.81
183.68
12.50
1,118.01
39,524
586.71
1,094.95
13.00
1,159.71
40,928
586.78
1,162.37
13.50
807.72
31,190
586.27
823.39
14.00
492.80
21,546
585.68
501.01
14.50
299.93
14,923
585.19
307.85
15.00
222.34
11,867
584.93
224.11
15.50
185.14
10,356
584.79
186.51
16.00
159.94
9,284
584.68
160.92
16.50
139.92
8,406
584.59
140.70
17.00
125.26
7,736
584.52
125.82
17.50
114.70
7,246
584.46
115.12
18.00
106.76
6,868
584.42
107.09
18.50
100.13
6,553
584.38
100.42
19.00
93.93
6,247
584.34
94.22
19.50
88.27
5,967
584.31
88.55
20.00
82.23
5,667
584.27
82.53
20.50
76.18
5,352
584.23
76.46
21.00
71.29
5,095
584.20
71.49
21.50
67.91
4,918
584.17
68.05
22.00
65.72
4,797
584.16
65.81
22.50
64.18
4,712
584.14
64.25
23.00
62.89
4,641
584.13
62.95
23.50
61.68
4,575
584.12
61.74
24.00
60.49
4,510
584.11
60.55

ATTACHMENT A-2
HydroCAD Calculations for Basin Design:
Existing Conditions 100yr storm
Belews Creek Basin Design Memo

26R
ZI-Dan
ive0
17
- DA 17
DA 16
25R a-
15
RCuv rt
DA 15
14
.All
24R 4--
ad Ctrt DA 13
12
DA 12 23R o--, 11
Stream Beginning
1 O DA 11
DA 10
18-1
18-1
O � 17-1
9
DA9
O
DA6 8_1 O
6-1
7-1
8-1 DA8
O� � 7
O
DA5 5_1 O DA7
4-1
4-1 \
O D 3 2 O
,,,ppp 4
DA3 Dr y-2
I DA4
3-1QQ
p 8S
1-1 2-1
/ 11 21 O
DA18
O O
DA1 DA2
Subcat Reach on Link Routing Diagram for Existing Conditions
Prepared by AECOM, Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC

Existing Conditions Type 1124-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n o1089 ©2017 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 1: DA1
Runoff = 975.62 cfs @ 12.02 hrs, Volume= 54.893 af, Depth> 4.86"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
23.263
80
Pine Haul Road Landfill Liner
31.561
70
Woods, Good, HSG C
59.634
80
>75% Grass cover, Good, HSG D
21.040
55
Woods, Good, HSG B
135.498
74
Weighted Average
135.498
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
4.2
100
0.1635
0.40
Sheet Flow,
Grass: Short n= 0.150 P2= 3.31"
0.4
180
0.2536
7.55
Shallow Concentrated Flow, Down sideslope
Grassed Waterway Kv= 15.0 fps
3.7
829
0.0636
3.78
Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
2.1
978
0.0231
7.95
1,621.95 Trap/Vee/Rect Channel Flow,
Bot.W=0.00' D=4.00' Z= 13.5 & 12.0'/' Top.W=102.00'
n= 0.045
10.4 2,087 Total

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 3
1,000
900
800
700
600
_0 500
400
300
200
100
0
Subcatchment 1: DA1
Hydrograph
975.62 cfs
Type II 24-1�r
100 years - 24 hrs Rainfall=7.94"
Runoff Area=135.498 ac
— -
Runoff Volume=54.893I of
Runoff Depth>4. 6"
Flow Length=2,0�7'- t
Tc=10.4 min
CN=74
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 4
Hydrograph for Subcatchment 1: DA1
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.24
7.00
0.79
0.00
0.69
7.25
0.83
0.00
1.17
7.50
0.87
0.01
1.67
7.75
0.91
0.01
2.18
8.00
0.95
0.02
2.72
8.25
1.00
0.02
3.39
8.50
1.05
0.03
4.34
8.75
1.11
0.04
5.46
9.00
1.17
0.05
6.74
9.25
1.23
0.07
7.92
9.50
1.29
0.09
8.77
9.75
1.36
0.10
10.04
10.00
1.44
0.13
12.18
10.25
1.52
0.16
14.91
10.50
1.62
0.19
18.44
10.75
1.73
0.23
23.11
11.00
1.87
0.29
29.48
11.25
2.03
0.37
39.52
11.50
2.25
0.47
55.60
11.75
3.07
0.95
214.59
12.00
5.26
2.58
961.94
12.25
5.61
2.86
228.00
12.50
5.84
3.05
112.11
12.75
6.00
3.18
76.06
13.00
6.13
3.29
63.41
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
3.39
53.93
13.50
6.34
3.48
47.52
13.75
6.43
3.55
41.93
14.00
6.51
3.62
37.36
14.25
6.58
3.68
33.98
14.50
6.65
3.74
32.34
14.75
6.72
3.80
30.77
15.00
6.78
3.85
29.19
15.25
6.83
3.90
27.60
15.50
6.89
3.95
26.01
15.75
6.94
3.99
24.40
16.00
6.99
4.03
22.79
16.25
7.03
4.07
21.58
16.50
7.08
4.11
20.98
16.75
7.12
4.15
20.41
17.00
7.16
4.18
19.84
17.25
7.20
4.22
19.27
17.50
7.24
4.25
18.70
17.75
7.28
4.28
18.12
18.00
7.31
4.32
17.55
18.25
7.35
4.35
16.97
18.50
7.38
4.38
16.39
18.75
7.41
4.41
15.80
19.00
7.45
4.43
15.22
19.25
7.48
4.46
14.63
19.50
7.50
4.49
14.04
19.75
7.53
4.51
13.46
20.00
7.56
4.53
12.86
20.25
7.58
4.56
12.46
20.50
7.61
4.58
12.33
20.75
7.64
4.60
12.22
21.00
7.66
4.62
12.11
21.25
7.68
4.64
11.99
21.50
7.71
4.67
11.88
21.75
7.73
4.69
11.77
22.00
7.76
4.71
11.65
22.25
7.78
4.73
11.54
22.50
7.80
4.75
11.42
22.75
7.83
4.77
11.31
23.00
7.85
4.79
11.19
23.25
7.87
4.81
11.08
23.50
7.90
4.83
10.96
23.75
7.92
4.85
10.85
24.00
7.94
4.87
10.73

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 5
Summary for Subcatchment 2: DA2
Runoff = 516.52 cfs @ 12.20 hrs, Volume= 44.885 af, Depth> 4.38"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
43.498
70
Woods, Good, HSG C
49.167
80
Liner
0.710
74
>75% Grass cover, Good, HSG C
28.998
55
Woods, Good, HSG B
0.473
61
>75% Grass cover, Good, HSG B
122.846
70
Weighted Average
122.846
100.00% Pervious Area
Tc
(min)
Length
(feet)
Slope
(ft/ft)
Velocity
(ft/sec)
Capacity Description
(cfs)
11.0
100
0.1026
0.15
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
14.8
904
0.0415
1.02
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
25.8 1,004 Total
550
500
450
400
4 350
300
o 250
FL
200
150
100
50
0
Subcatchment 2: DA2
Hydrograph
516.52 cfs
Type ll24--hr
100 ars - 24-hr Rainfall=7.94"
-
Runbff Area=122.846 ac'
Run?ff Volume=4�.885 �f
Runoff Depth>4.38"
Flo*-Length=1 094'
Tc=25.8 min
CN=iO -1 - 1- 1-
-
T I T
T
T
T- -
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 6
Hydrograph for Subcatchment 2: DA2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.05
8.00
0.95
0.00
0.31
8.25
1.00
0.00
0.70
8.50
1.05
0.01
1.20
8.75
1.11
0.01
1.83
9.00
1.17
0.02
2.61
9.25
1.23
0.03
3.51
9.50
1.29
0.04
4.37
9.75
1.36
0.05
5.16
10.00
1.44
0.07
6.29
10.25
1.52
0.09
7.86
10.50
1.62
0.12
9.97
10.75
1.73
0.15
12.68
11.00
1.87
0.19
16.45
11.25
2.03
0.25
21.60
11.50
2.25
0.34
30.24
11.75
3.07
0.76
56.81
12.00
5.26
2.23
274.65
12.25
5.61
2.50
493.77
12.50
5.84
2.68
230.31
12.75
6.00
2.80
117.73
13.00
6.13
2.91
74.54
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
3.00
56.31
13.50
6.34
3.08
46.76
13.75
6.43
3.15
40.77
14.00
6.51
3.22
36.06
14.25
6.58
3.27
32.13
14.50
6.65
3.33
29.51
14.75
6.72
3.38
27.87
15.00
6.78
3.43
26.47
15.25
6.83
3.48
25.10
15.50
6.89
3.53
23.75
15.75
6.94
3.57
22.38
16.00
6.99
3.61
21.00
16.25
7.03
3.65
19.67
16.50
7.08
3.68
18.74
16.75
7.12
3.72
18.15
17.00
7.16
3.75
17.64
17.25
7.20
3.79
17.15
17.50
7.24
3.82
16.66
17.75
7.28
3.85
16.17
18.00
7.31
3.88
15.67
18.25
7.35
3.91
15.18
18.50
7.38
3.94
14.68
18.75
7.41
3.97
14.18
19.00
7.45
3.99
13.68
19.25
7.48
4.02
13.18
19.50
7.50
4.04
12.67
19.75
7.53
4.07
12.17
20.00
7.56
4.09
11.65
20.25
7.58
4.11
11.17
20.50
7.61
4.13
10.87
20.75
7.64
4.15
10.72
21.00
7.66
4.17
10.61
21.25
7.68
4.19
10.52
21.50
7.71
4.22
10.42
21.75
7.73
4.24
10.32
22.00
7.76
4.26
10.23
22.25
7.78
4.28
10.13
22.50
7.80
4.30
10.03
22.75
7.83
4.32
9.93
23.00
7.85
4.34
9.83
23.25
7.87
4.36
9.74
23.50
7.90
4.37
9.64
23.75
7.92
4.39
9.54
24.00
7.94
4.41
9.44

Existing Conditions Type 1124-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 7
Summary for Subcatchment 3: DA3
Runoff = 473.29 cfs @ 12.16 hrs, Volume= 38.573 af, Depth> 4.96"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
63.990
80
Liner
16.446
70
Woods, Good, HSG C
1.140
74
>75% Grass cover, Good, HSG C
10.964
55
Woods, Good, HSG B
0.760
61
>75% Grass cover, Good, HSG B
93.300
75
Weighted Average
93.300
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
12.4
100
0.0753
0.13
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
8.4
584
0.0541
1.16
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
2.3
973
0.0186
7.13
1,426.77 Trap/Vee/Rect Channel Flow,
Bot.W=0.00' D=4.00' Z= 13.0 & 12.0'/' Top.W=100.00'
n= 0.045
23.1 1,657 Total
500
450
400
350
300
3 250
0
u- 200
150
100
50
0
Subcatchment 3: DA3
Hydrograph
473.29 cfs
Type II 24-hr
100 years - 24 hrs Rainfall=7.94"
Runoff Area=93.300 ac
Runoff Volume=38.573 of
Runoff Depth>4.96"
Flow Length=1,657'
Tc=23.1 min
CN=75
L
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 8
Hydrograph for Subcatchment 3: DA3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.04
6.75
0.75
0.00
0.24
7.00
0.79
0.00
0.54
7.25
0.83
0.01
0.87
7.50
0.87
0.01
1.22
7.75
0.91
0.02
1.58
8.00
0.95
0.02
1.95
8.25
1.00
0.03
2.35
8.50
1.05
0.04
2.91
8.75
1.11
0.05
3.63
9.00
1.17
0.07
4.47
9.25
1.23
0.08
5.38
9.50
1.29
0.10
6.13
9.75
1.36
0.12
6.79
10.00
1.44
0.14
7.93
10.25
1.52
0.17
9.52
10.50
1.62
0.21
11.64
10.75
1.73
0.26
14.31
11.00
1.87
0.32
18.03
11.25
2.03
0.40
23.02
11.50
2.25
0.51
31.57
11.75
3.07
1.01
61.41
12.00
5.26
2.67
291.58
12.25
5.61
2.95
413.42
12.50
5.84
3.14
167.44
12.75
6.00
3.28
84.98
13.00
6.13
3.39
55.90
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
3.49
43.29
13.50
6.34
3.58
36.99
13.75
6.43
3.65
32.34
14.00
6.51
3.72
28.64
14.25
6.58
3.78
25.52
14.50
6.65
3.84
23.59
14.75
6.72
3.90
22.33
15.00
6.78
3.95
21.20
15.25
6.83
4.00
20.09
15.50
6.89
4.05
18.98
15.75
6.94
4.10
17.86
16.00
6.99
4.14
16.74
16.25
7.03
4.18
15.67
16.50
7.08
4.22
14.98
16.75
7.12
4.25
14.53
17.00
7.16
4.29
14.12
17.25
7.20
4.33
13.72
17.50
7.24
4.36
13.32
17.75
7.28
4.39
12.92
18.00
7.31
4.43
12.52
18.25
7.35
4.46
12.12
18.50
7.38
4.49
11.71
18.75
7.41
4.52
11.31
19.00
7.45
4.54
10.90
19.25
7.48
4.57
10.49
19.50
7.50
4.60
10.09
19.75
7.53
4.62
9.68
20.00
7.56
4.65
9.27
20.25
7.58
4.67
8.88
20.50
7.61
4.69
8.67
20.75
7.64
4.71
8.56
21.00
7.66
4.74
8.48
21.25
7.68
4.76
8.40
21.50
7.71
4.78
8.32
21.75
7.73
4.80
8.24
22.00
7.76
4.82
8.16
22.25
7.78
4.84
8.08
22.50
7.80
4.87
8.00
22.75
7.83
4.89
7.92
23.00
7.85
4.91
7.84
23.25
7.87
4.93
7.76
23.50
7.90
4.95
7.68
23.75
7.92
4.97
7.60
24.00
7.94
4.99
7.52

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 9
Summary for Subcatchment 4: DA4
Runoff = 481.89 cfs @ 11.95 hrs, Volume= 23.460 af, Depth> 5.80"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
35.330
80
Liner
8.930
98
Water Surface, HSG C
2.574
70
Woods, Good, HSG C
1.716
55
Woods, Good, HSG B
48.550
82
Weighted Average
39.620
81.61 % Pervious Area
8.930
18.39% Impervious Area
Tc
(min)
Length
(feet)
Slope
(ft/ft)
Velocity
(ft/sec)
Capacity Description
(cfs)
1.8
100
0.0685
0.91
Sheet Flow,
n= 0.035 P2= 3.31 "
1.4
559
0.0563
6.76
188.50 Channel Flow,
Area= 27.9 sf Perim= 50.8' r= 0.55' n= 0.035
3.2
500
450
400
350
300
0 250
" 200
150
100
50
0
659 Total, Increased to minimum Tc = 5.0 min
Subcatchment 4: DA4
Hydrograph
481.89 cfs
Type II 24-hr
100�year - 24 hrs Rainfall=7.94"
Run ffArea�-48.550 ac
Runoff IVolume=23.460 of
Runoff Depth>5.80"
7 -1 r- Flow Length=659'
Tc=5.0 min
CN=82
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 10
Hydrograph for Subcatchment 4: DA4
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.11
5.00
0.50
0.00
0.28
5.25
0.53
0.00
0.46
5.50
0.57
0.01
0.64
5.75
0.60
0.01
0.84
6.00
0.64
0.02
1.04
6.25
0.67
0.02
1.25
6.50
0.71
0.03
1.46
6.75
0.75
0.04
1.68
7.00
0.79
0.05
1.91
7.25
0.83
0.06
2.14
7.50
0.87
0.07
2.37
7.75
0.91
0.08
2.62
8.00
0.95
0.10
2.86
8.25
1.00
0.11
3.31
8.50
1.05
0.13
3.88
8.75
1.11
0.16
4.52
9.00
1.17
0.18
5.20
9.25
1.23
0.21
5.63
9.50
1.29
0.24
5.91
9.75
1.36
0.27
6.72
10.00
1.44
0.31
7.84
10.25
1.52
0.36
9.34
10.50
1.62
0.41
11.10
10.75
1.73
0.48
13.64
11.00
1.87
0.56
16.71
11.25
2.03
0.67
22.53
11.50
2.25
0.82
30.14
11.75
3.07
1.44
156.36
12.00
5.26
3.32
409.05
12.25
5.61
3.63
57.21
12.50
5.84
3.84
37.21
12.75
6.00
3.98
27.87
13.00
6.13
4.11
23.29
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
4.21
20.17
13.50
6.34
4.30
17.70
13.75
6.43
4.39
15.70
14.00
6.51
4.46
13.92
14.25
6.58
4.53
12.94
14.50
6.65
4.59
12.32
14.75
6.72
4.65
11.71
15.00
6.78
4.71
11.08
15.25
6.83
4.76
10.46
15.50
6.89
4.81
9.83
15.75
6.94
4.86
9.20
16.00
6.99
4.90
8.57
16.25
7.03
4.95
8.22
16.50
7.08
4.99
8.00
16.75
7.12
5.03
7.78
17.00
7.16
5.07
7.55
17.25
7.20
5.10
7.33
17.50
7.24
5.14
7.11
17.75
7.28
5.18
6.88
18.00
7.31
5.21
6.66
18.25
7.35
5.24
6.43
18.50
7.38
5.27
6.20
18.75
7.41
5.31
5.98
19.00
7.45
5.34
5.75
19.25
7.48
5.36
5.53
19.50
7.50
5.39
5.30
19.75
7.53
5.42
5.07
20.00
7.56
5.44
4.84
20.25
7.58
5.47
4.74
20.50
7.61
5.49
4.70
20.75
7.64
5.51
4.65
21.00
7.66
5.54
4.61
21.25
7.68
5.56
4.56
21.50
7.71
5.58
4.52
21.75
7.73
5.61
4.47
22.00
7.76
5.63
4.43
22.25
7.78
5.65
4.39
22.50
7.80
5.67
4.34
22.75
7.83
5.70
4.30
23.00
7.85
5.72
4.25
23.25
7.87
5.74
4.21
23.50
7.90
5.76
4.16
23.75
7.92
5.78
4.12
24.00
7.94
5.80
4.06

Existing Conditions Type 1124-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 11
Summary for Subcatchment 5: DA5
Runoff = 321.66 cfs @ 12.12 hrs, Volume= 23.744 af, Depth> 4.85"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
12.312
70
Woods, Good, HSG C
35.810
80
Liner
1.448
74
>75% Grass cover, Good, HSG C
8.208
55
Woods, Good, HSG B
0.965
61
>75% Grass cover, Good, HSG B
58.743
74
Weighted Average
58.743
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
11.7
100
0.0884
0.14
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
6.4
611
0.0517
1.59
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
1.3
846
0.0338
11.16
3,347.11 Trap/Vee/Rect Channel Flow,
Bot.W=0.00' D=5.00' Z= 11.0 & 13.0'/' Top.W=120.00'
n= 0.045
19.4 1,557 Total
350 1
250
200
3
F 150
100
50
0
Subcatchment 5: DA5
Hydrograph
321.66 cis
Type II 24-hr
100 years - 24 hrs Rainfall=7.94"
Runoff Area=58.743 ac
Runoff Volume=23.744 of
Runoff Depth>4.85"
Flow Length=1,557'
Tc=19.4 min
CN=74
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 12
Hydrograph for Subcatchment 5: DA5
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.04
7.00
0.79
0.00
0.19
7.25
0.83
0.00
0.39
7.50
0.87
0.01
0.60
7.75
0.91
0.01
0.82
8.00
0.95
0.02
1.05
8.25
1.00
0.02
1.30
8.50
1.05
0.03
1.65
8.75
1.11
0.04
2.10
9.00
1.17
0.05
2.61
9.25
1.23
0.07
3.16
9.50
1.29
0.09
3.59
9.75
1.36
0.10
4.02
10.00
1.44
0.13
4.78
10.25
1.52
0.16
5.79
10.50
1.62
0.19
7.15
10.75
1.73
0.23
8.85
11.00
1.87
0.29
11.26
11.25
2.03
0.37
14.54
11.50
2.25
0.47
20.28
11.75
3.07
0.95
45.60
12.00
5.26
2.58
228.82
12.25
5.61
2.86
226.89
12.50
5.84
3.05
82.49
12.75
6.00
3.18
43.92
13.00
6.13
3.29
31.16
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
3.39
25.62
13.50
6.34
3.48
22.21
13.75
6.43
3.55
19.50
14.00
6.51
3.62
17.32
14.25
6.58
3.68
15.48
14.50
6.65
3.74
14.45
14.75
6.72
3.80
13.72
15.00
6.78
3.85
13.04
15.25
6.83
3.90
12.35
15.50
6.89
3.95
11.66
15.75
6.94
3.99
10.97
16.00
6.99
4.03
10.27
16.25
7.03
4.07
9.62
16.50
7.08
4.11
9.25
16.75
7.12
4.15
8.99
17.00
7.16
4.18
8.74
17.25
7.20
4.22
8.49
17.50
7.24
4.25
8.25
17.75
7.28
4.28
8.00
18.00
7.31
4.32
7.75
18.25
7.35
4.35
7.50
18.50
7.38
4.38
7.24
18.75
7.41
4.41
6.99
19.00
7.45
4.43
6.74
19.25
7.48
4.46
6.48
19.50
7.50
4.49
6.23
19.75
7.53
4.51
5.98
20.00
7.56
4.53
5.72
20.25
7.58
4.56
5.49
20.50
7.61
4.58
5.38
20.75
7.64
4.60
5.33
21.00
7.66
4.62
5.28
21.25
7.68
4.64
5.23
21.50
7.71
4.67
5.18
21.75
7.73
4.69
5.13
22.00
7.76
4.71
5.08
22.25
7.78
4.73
5.03
22.50
7.80
4.75
4.98
22.75
7.83
4.77
4.93
23.00
7.85
4.79
4.88
23.25
7.87
4.81
4.83
23.50
7.90
4.83
4.78
23.75
7.92
4.85
4.73
24.00
7.94
4.87
4.68

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 13
Summary for Subcatchment 6: DA6
Runoff = 133.12 cfs @ 12.04 hrs, Volume= 8.029 af, Depth> 4.86"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
4.248
70
Woods, Good, HSG C
12.750
80
liner
2.832
55
Woods, Good, HSG B
19.830
74
Weighted Average
19.830
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
4.6
100
0.1265
0.36
Sheet Flow,
Grass: Short n= 0.150 P2= 3.31"
8.1
675
0.0389
1.38
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fDs
12.7 775 Total
140
120
100
80
3
,0 60
40
20
0
Subcatchment 6: DA6
Hydrograph
133.12 cfs
Typo II 24-hr
100 years - 24 hrs Rainfall=7.94"
Runoff Area=19.830 ac
Runoff Volume=8.029 of
Runoff Depth>4.86"
Flout Length=7751
Tc=12.7 min
CN=J4
L
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 14
Hydrograph for Subcatchment 6: DA6
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.03
7.00
0.79
0.00
0.09
7.25
0.83
0.00
0.16
7.50
0.87
0.01
0.23
7.75
0.91
0.01
0.31
8.00
0.95
0.02
0.39
8.25
1.00
0.02
0.48
8.50
1.05
0.03
0.61
8.75
1.11
0.04
0.77
9.00
1.17
0.05
0.96
9.25
1.23
0.07
1.14
9.50
1.29
0.09
1.27
9.75
1.36
0.10
1.44
10.00
1.44
0.13
1.74
10.25
1.52
0.16
2.12
10.50
1.62
0.19
2.62
10.75
1.73
0.23
3.27
11.00
1.87
0.29
4.18
11.25
2.03
0.37
5.52
11.50
2.25
0.47
7.78
11.75
3.07
0.95
25.62
12.00
5.26
2.58
122.56
12.25
5.61
2.86
43.67
12.50
5.84
3.05
18.33
12.75
6.00
3.18
11.62
13.00
6.13
3.29
9.53
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
3.39
8.05
13.50
6.34
3.48
7.09
13.75
6.43
3.55
6.24
14.00
6.51
3.62
5.56
14.25
6.58
3.68
5.03
14.50
6.65
3.74
4.77
14.75
6.72
3.80
4.54
15.00
6.78
3.85
4.30
15.25
6.83
3.90
4.07
15.50
6.89
3.95
3.84
15.75
6.94
3.99
3.60
16.00
6.99
4.03
3.37
16.25
7.03
4.07
3.18
16.50
7.08
4.11
3.08
16.75
7.12
4.15
3.00
17.00
7.16
4.18
2.92
17.25
7.20
4.22
2.83
17.50
7.24
4.25
2.75
17.75
7.28
4.28
2.66
18.00
7.31
4.32
2.58
18.25
7.35
4.35
2.50
18.50
7.38
4.38
2.41
18.75
7.41
4.41
2.32
19.00
7.45
4.43
2.24
19.25
7.48
4.46
2.15
19.50
7.50
4.49
2.07
19.75
7.53
4.51
1.98
20.00
7.56
4.53
1.89
20.25
7.58
4.56
1.83
20.50
7.61
4.58
1.81
20.75
7.64
4.60
1.79
21.00
7.66
4.62
1.77
21.25
7.68
4.64
1.76
21.50
7.71
4.67
1.74
21.75
7.73
4.69
1.72
22.00
7.76
4.71
1.71
22.25
7.78
4.73
1.69
22.50
7.80
4.75
1.67
22.75
7.83
4.77
1.66
23.00
7.85
4.79
1.64
23.25
7.87
4.81
1.62
23.50
7.90
4.83
1.61
23.75
7.92
4.85
1.59
24.00
7.94
4.87
1.57

Existing Conditions Type 1124-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n o1089 ©2017 HydroCAD Software Solutions LLC Page 15
Summary for Subcatchment 7: DA7
Runoff = 366.57 cfs @ 12.30 hrs, Volume= 39.286 af, Depth> 5.53"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Adj Description
52.705
80
Liner
20.490
98
Unconnected pavement, HSG C
7.275
70
Woods, Good, HSG C
4.850
55
Woods, Good, HSG B
85.320
82
80 Weighted Average, UI Adjusted
64.830
75.98% Pervious Area
20.490
24.02% Impervious Area
20.490
100.00% Unconnected
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
10.9
100
0.1054
0.15
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
24.2
1,471
0.0410
1.01
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
0.3
154
0.0430
8.97
1,936.85 Trap/Vee/Rect Channel Flow,
Bot.W=0.00' D=3.00' Z= 15.0 & 33.0'/' Top.W=144.00'
n= 0.045
35.4 1,725 Total

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 16
Subcatchment 7: DA7
Hydrograph
400
350
300
250
3 200
0
" 150
100
50
0
366.57 cfs
Type II 24-hr 1 - 4-
100 years - 24 hrs Rainfall=7.94"
Runoff Area=85.320 ac - L
Runoff Volume=39.286 of
Runoff Depth>5.53"
Flow Length=1,725'
Tc=35.4 min
UI Adjusted CN=80
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 17
Hydrograph for Subcatchment 7: DA7
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.01
5.50
0.57
0.00
0.08
5.75
0.60
0.00
0.28
6.00
0.64
0.01
0.55
6.25
0.67
0.01
0.85
6.50
0.71
0.02
1.18
6.75
0.75
0.02
1.51
7.00
0.79
0.03
1.86
7.25
0.83
0.04
2.22
7.50
0.87
0.05
2.60
7.75
0.91
0.06
2.98
8.00
0.95
0.07
3.37
8.25
1.00
0.08
3.78
8.50
1.05
0.10
4.31
8.75
1.11
0.12
5.04
9.00
1.17
0.14
5.94
9.25
1.23
0.17
6.94
9.50
1.29
0.19
7.87
9.75
1.36
0.22
8.59
10.00
1.44
0.26
9.49
10.25
1.52
0.30
10.91
10.50
1.62
0.35
12.85
10.75
1.73
0.41
15.34
11.00
1.87
0.48
18.62
11.25
2.03
0.58
23.00
11.50
2.25
0.72
29.67
11.75
3.07
1.30
44.92
12.00
5.26
3.12
148.10
12.25
5.61
3.43
358.11
12.50
5.84
3.63
280.80
12.75
6.00
3.78
148.51
13.00
6.13
3.90
87.08
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
4.00
58.62
13.50
6.34
4.09
44.39
13.75
6.43
4.17
36.14
14.00
6.51
4.25
30.69
14.25
6.58
4.31
27.05
14.50
6.65
4.37
24.35
14.75
6.72
4.43
22.60
15.00
6.78
4.49
21.29
15.25
6.83
4.54
20.13
15.50
6.89
4.59
19.03
15.75
6.94
4.64
17.95
16.00
6.99
4.68
16.88
16.25
7.03
4.72
15.81
16.50
7.08
4.76
14.91
16.75
7.12
4.80
14.30
17.00
7.16
4.84
13.84
17.25
7.20
4.88
13.43
17.50
7.24
4.92
13.04
17.75
7.28
4.95
12.65
18.00
7.31
4.98
12.26
18.25
7.35
5.02
11.87
18.50
7.38
5.05
11.48
18.75
7.41
5.08
11.09
19.00
7.45
5.11
10.71
19.25
7.48
5.14
10.31
19.50
7.50
5.16
9.92
19.75
7.53
5.19
9.52
20.00
7.56
5.21
9.13
20.25
7.58
5.24
8.75
20.50
7.61
5.26
8.44
20.75
7.64
5.28
8.26
21.00
7.66
5.31
8.15
21.25
7.68
5.33
8.06
21.50
7.71
5.35
7.98
21.75
7.73
5.38
7.91
22.00
7.76
5.40
7.83
22.25
7.78
5.42
7.75
22.50
7.80
5.44
7.67
22.75
7.83
5.46
7.60
23.00
7.85
5.49
7.52
23.25
7.87
5.51
7.44
23.50
7.90
5.53
7.36
23.75
7.92
5.55
7.28
24.00
7.94
5.57
7.21

Existing Conditions Type 1124-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 18
Summary for Subcatchment 8: DA8
Runoff = 317.22 cfs @ 12.17 hrs, Volume= 26.227 af, Depth> 4.16"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
12.770
80
Liner
2.290
98
Water Surface, HSG C
36.360
70
Woods, Good, HSG C
24.240
55
Woods, Good, HSG B
75.660
68
Weighted Average
73.370
96.97% Pervious Area
2.290
3.03% Impervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
13.4
100
0.0620
0.12
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
9.4
753
0.0714
1.34
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
0.9
390
0.0293
7.40
1,849.03 Trap/Vee/Rect Channel Flow,
Bot.W=0.00' D=3.00' Z= 33.0 & 22.5 '/' Top.W=166.50'
n= 0.045
23.7 1,243 Total
350 1
W
200
3
150
u-
�7%
0
Subcatchment 8: DA8
Hydrograph
317.22 cfs
Type II 24-hr
100 years - 24 hrs Rainfall=7.94"
Runoff Area=75.660 ac
Runoff Volume=26.227 of
Runoff Depth>4.16"
Flow Length=1,243'
Tc=23.7 min
CN=68
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 19
Hydrograph for Subcatchment 8: DA8
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.04
8.50
1.05
0.00
0.25
8.75
1.11
0.01
0.57
9.00
1.17
0.01
0.99
9.25
1.23
0.02
1.48
9.50
1.29
0.02
1.96
9.75
1.36
0.03
2.43
10.00
1.44
0.05
3.09
10.25
1.52
0.06
3.99
10.50
1.62
0.09
5.19
10.75
1.73
0.11
6.75
11.00
1.87
0.15
8.94
11.25
2.03
0.21
11.96
11.50
2.25
0.28
17.14
11.75
3.07
0.66
34.75
12.00
5.26
2.07
181.54
12.25
5.61
2.32
287.00
12.50
5.84
2.50
122.02
12.75
6.00
2.62
62.87
13.00
6.13
2.72
41.38
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.81
32.00
13.50
6.34
2.89
27.29
13.75
6.43
2.96
23.90
14.00
6.51
3.02
21.19
14.25
6.58
3.08
18.91
14.50
6.65
3.13
17.47
14.75
6.72
3.18
16.55
15.00
6.78
3.23
15.73
15.25
6.83
3.28
14.92
15.50
6.89
3.32
14.12
15.75
6.94
3.36
13.30
16.00
6.99
3.40
12.48
16.25
7.03
3.44
11.69
16.50
7.08
3.47
11.17
16.75
7.12
3.51
10.84
17.00
7.16
3.54
10.54
17.25
7.20
3.57
10.25
17.50
7.24
3.60
9.96
17.75
7.28
3.64
9.66
18.00
7.31
3.66
9.37
18.25
7.35
3.69
9.07
18.50
7.38
3.72
8.78
18.75
7.41
3.75
8.48
19.00
7.45
3.77
8.18
19.25
7.48
3.80
7.88
19.50
7.50
3.82
7.57
19.75
7.53
3.85
7.27
20.00
7.56
3.87
6.96
20.25
7.58
3.89
6.67
20.50
7.61
3.91
6.51
20.75
7.64
3.93
6.43
21.00
7.66
3.95
6.37
21.25
7.68
3.97
6.31
21.50
7.71
3.99
6.26
21.75
7.73
4.01
6.20
22.00
7.76
4.03
6.14
22.25
7.78
4.05
6.08
22.50
7.80
4.07
6.03
22.75
7.83
4.09
5.97
23.00
7.85
4.11
5.91
23.25
7.87
4.13
5.85
23.50
7.90
4.15
5.79
23.75
7.92
4.17
5.73
24.00
7.94
4.18
5.67

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n o1089 ©2017 HydroCAD Software Solutions LLC Page 20
Summary for Subcatchment 8S: DA18
Runoff = 195.32 cfs @ 12.06 hrs, Volume= 12.677 af, Depth> 5.32"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
8.820
80 Landfill
6.006
70 Woods, Good, HSG C
9.770
91 Urban industrial, 72% imp,
HSG C
4.004
55 Woods, Good, HSG B
28.600
78 Weighted Average
21.566
75.40% Pervious Area
7.034
24.60% Impervious Area
Tc Length
Slope Velocity Capacity
Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
4.6 100
0.3300 0.36
Sheet Flow,
Grass: Dense n= 0.240 P2= 3.31"
7.6 565
0.0620 1.24
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
1.5 823
0.0240 9.13 328.81
Channel Flow,
Area= 36.0 sf Perim= 22.0' r= 1.64' n= 0.035
1.0 624
0.0320 10.55 379.68
Channel Flow,
Area= 36.0 sf Perim= 22.0' r= 1.64' n= 0.035
14.7 2,112 Total

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 21
Subcatchment 8S: DA18
Hydrograph
200
180
160
140
120
0 100
80
60
40
20
0
11=74'9'
2 cfs
Type- II 24-hr _ _
100 years - 24 hrs Rainf—
Runoff Area=28.600 ac
Runoff Volume=12.677
Runoff Depth>5.3�2"
Flow-Length=2; 12'-t
Tc=14.7 min
CN=78
L -1
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 22
Hydrograph for Subcatchment 8S: DA18
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.02
6.00
0.64
0.00
0.11
6.25
0.67
0.00
0.21
6.50
0.71
0.01
0.32
6.75
0.75
0.01
0.42
7.00
0.79
0.02
0.54
7.25
0.83
0.02
0.66
7.50
0.87
0.03
0.78
7.75
0.91
0.04
0.90
8.00
0.95
0.05
1.03
8.25
1.00
0.06
1.18
8.50
1.05
0.07
1.43
8.75
1.11
0.09
1.71
9.00
1.17
0.11
2.04
9.25
1.23
0.13
2.35
9.50
1.29
0.15
2.55
9.75
1.36
0.18
2.80
10.00
1.44
0.21
3.29
10.25
1.52
0.24
3.92
10.50
1.62
0.29
4.76
10.75
1.73
0.34
5.80
11.00
1.87
0.41
7.27
11.25
2.03
0.50
9.34
11.50
2.25
0.63
12.91
11.75
3.07
1.18
36.17
12.00
5.26
2.94
169.30
12.25
5.61
3.23
83.19
12.50
5.84
3.43
31.36
12.75
6.00
3.58
18.50
13.00
6.13
3.69
14.81
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
3.80
12.42
13.50
6.34
3.88
10.89
13.75
6.43
3.96
9.57
14.00
6.51
4.03
8.51
14.25
6.58
4.10
7.65
14.50
6.65
4.16
7.22
14.75
6.72
4.22
6.87
15.00
6.78
4.27
6.52
15.25
6.83
4.33
6.17
15.50
6.89
4.37
5.81
15.75
6.94
4.42
5.46
16.00
6.99
4.46
5.10
16.25
7.03
4.50
4.79
16.50
7.08
4.54
4.64
16.75
7.12
4.58
4.51
17.00
7.16
4.62
4.39
17.25
7.20
4.66
4.26
17.50
7.24
4.69
4.13
17.75
7.28
4.73
4.01
18.00
7.31
4.76
3.88
18.25
7.35
4.79
3.75
18.50
7.38
4.82
3.62
18.75
7.41
4.85
3.50
19.00
7.45
4.88
3.37
19.25
7.48
4.91
3.24
19.50
7.50
4.94
3.11
19.75
7.53
4.96
2.98
20.00
7.56
4.98
2.85
20.25
7.58
5.01
2.74
20.50
7.61
5.03
2.70
20.75
7.64
5.05
2.68
21.00
7.66
5.08
2.65
21.25
7.68
5.10
2.63
21.50
7.71
5.12
2.60
21.75
7.73
5.15
2.58
22.00
7.76
5.17
2.55
22.25
7.78
5.19
2.53
22.50
7.80
5.21
2.50
22.75
7.83
5.23
2.48
23.00
7.85
5.25
2.45
23.25
7.87
5.27
2.43
23.50
7.90
5.29
2.40
23.75
7.92
5.32
2.38
24.00
7.94
5.34
2.35

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 23
Summary for Subcatchment 9: DA9
Runoff = 19.74 cfs @ 12.00 hrs, Volume= 1.072 af, Depth> 5.56"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
2.314 80 Liner
2.314 100.00% Pervious Area
Tc Length
(min) (feet)
Slope
(ft/ft)
Velocity
(ft/sec)
Capacity Description
(cfs)
5.8 100
0.0710
0.29
Sheet Flow,
Grass: Short n= 0.150 P2= 3.31"
3.1 765
0.0775
4.18
Shallow Concentrated Flow,
Grassed Waterwav Kv= 15.0 fos
8.9 865 Total
1
Subcatchment 9: DA9
Hydrograph
19.74 cfs
hype II 14-hr
1Q0 yeas
- 24 hrs R infall=7.94"
-
-Runoff Area=2.314 ac
IRunoflf Volu a=1.072 of
T
Runoffepth>5.56"
T
T T IRow "ngth=8W
Tc=8.9 min
T
T T T CN=80
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 24
Hydrograph for Subcatchment 9: DA9
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.01
5.75
0.60
0.00
0.02
6.00
0.64
0.01
0.03
6.25
0.67
0.01
0.04
6.50
0.71
0.02
0.05
6.75
0.75
0.02
0.06
7.00
0.79
0.03
0.07
7.25
0.83
0.04
0.08
7.50
0.87
0.05
0.09
7.75
0.91
0.06
0.10
8.00
0.95
0.07
0.11
8.25
1.00
0.08
0.13
8.50
1.05
0.10
0.15
8.75
1.11
0.12
0.18
9.00
1.17
0.14
0.21
9.25
1.23
0.17
0.23
9.50
1.29
0.19
0.24
9.75
1.36
0.22
0.27
10.00
1.44
0.26
0.32
10.25
1.52
0.30
0.38
10.50
1.62
0.35
0.46
10.75
1.73
0.41
0.56
11.00
1.87
0.48
0.70
11.25
2.03
0.58
0.92
11.50
2.25
0.72
1.25
11.75
3.07
1.30
5.12
12.00
5.26
3.12
19.74
12.25
5.61
3.43
3.56
12.50
5.84
3.63
1.96
12.75
6.00
3.78
1.36
13.00
6.13
3.90
1.14
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
4.00
0.97
13.50
6.34
4.09
0.86
13.75
6.43
4.17
0.76
14.00
6.51
4.25
0.67
14.25
6.58
4.31
0.61
14.50
6.65
4.37
0.58
14.75
6.72
4.43
0.56
15.00
6.78
4.49
0.53
15.25
6.83
4.54
0.50
15.50
6.89
4.59
0.47
15.75
6.94
4.64
0.44
16.00
6.99
4.68
0.41
16.25
7.03
4.72
0.39
16.50
7.08
4.76
0.38
16.75
7.12
4.80
0.37
17.00
7.16
4.84
0.36
17.25
7.20
4.88
0.35
17.50
7.24
4.92
0.34
17.75
7.28
4.95
0.33
18.00
7.31
4.98
0.32
18.25
7.35
5.02
0.30
18.50
7.38
5.05
0.29
18.75
7.41
5.08
0.28
19.00
7.45
5.11
0.27
19.25
7.48
5.14
0.26
19.50
7.50
5.16
0.25
19.75
7.53
5.19
0.24
20.00
7.56
5.21
0.23
20.25
7.58
5.24
0.22
20.50
7.61
5.26
0.22
20.75
7.64
5.28
0.22
21.00
7.66
5.31
0.22
21.25
7.68
5.33
0.22
21.50
7.71
5.35
0.21
21.75
7.73
5.38
0.21
22.00
7.76
5.40
0.21
22.25
7.78
5.42
0.21
22.50
7.80
5.44
0.20
22.75
7.83
5.46
0.20
23.00
7.85
5.49
0.20
23.25
7.87
5.51
0.20
23.50
7.90
5.53
0.20
23.75
7.92
5.55
0.19
24.00
7.94
5.57
0.19

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 25
Summary for Subcatchment 10: DA 10
Runoff = 156.18 cfs @ 12.02 hrs, Volume= 8.637 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
16.698
70
Woods, Good, HSG C
11.132
55
Woods, Good, HSG B
27.830
64
Weighted Average
27.830
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
7.2 100
0.2915
0.23
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
3.0 430
0.2216
2.35
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
10.2 530 Total
160
140
120
100
0 80
U-
:1t
.M
20
0-+
0
Subcatchment 10: DA 10
Hydrograph
156.18 cfs
Type II 24-11ir
100 rears-,24-hr 1Zainfaal=7-3,4"
Runoff Area=27.830 ac
Runr Volume=8.637 of
Runoff Depth>3.72"
Flo* Length=5301
Tc=10.2 min _
CN=44
T I
1
T T
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 26
Hydrograph for Subcatchment 10: DA 10
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.02
9.25
1.23
0.00
0.16
9.50
1.29
0.00
0.32
9.75
1.36
0.01
0.49
10.00
1.44
0.02
0.73
10.25
1.52
0.03
1.05
10.50
1.62
0.04
1.48
10.75
1.73
0.06
2.07
11.00
1.87
0.09
2.90
11.25
2.03
0.13
4.24
11.50
2.25
0.19
6.46
11.75
3.07
0.50
28.46
12.00
5.26
1.75
153.20
12.25
5.61
1.99
37.39
12.50
5.84
2.15
19.15
12.75
6.00
2.26
13.15
13.00
6.13
2.36
11.03
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
9.43
13.50
6.34
2.51
8.34
13.75
6.43
2.58
7.38
14.00
6.51
2.63
6.59
14.25
6.58
2.69
6.01
14.50
6.65
2.74
5.73
14.75
6.72
2.79
5.47
15.00
6.78
2.83
5.19
15.25
6.83
2.88
4.92
15.50
6.89
2.92
4.64
15.75
6.94
2.96
4.36
16.00
6.99
2.99
4.08
16.25
7.03
3.03
3.87
16.50
7.08
3.06
3.76
16.75
7.12
3.09
3.67
17.00
7.16
3.12
3.57
17.25
7.20
3.15
3.47
17.50
7.24
3.18
3.37
17.75
7.28
3.21
3.27
18.00
7.31
3.24
3.17
18.25
7.35
3.27
3.06
18.50
7.38
3.29
2.96
18.75
7.41
3.32
2.86
19.00
7.45
3.34
2.75
19.25
7.48
3.37
2.65
19.50
7.50
3.39
2.54
19.75
7.53
3.41
2.44
20.00
7.56
3.43
2.33
20.25
7.58
3.45
2.26
20.50
7.61
3.47
2.24
20.75
7.64
3.49
2.22
21.00
7.66
3.51
2.20
21.25
7.68
3.53
2.18
21.50
7.71
3.55
2.16
21.75
7.73
3.57
2.14
22.00
7.76
3.59
2.12
22.25
7.78
3.61
2.10
22.50
7.80
3.63
2.08
22.75
7.83
3.64
2.06
23.00
7.85
3.66
2.04
23.25
7.87
3.68
2.02
23.50
7.90
3.70
2.00
23.75
7.92
3.72
1.98
24.00
7.94
3.73
1.96

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 27
Summary for Subcatchment 11: DA 11
Runoff = 229.53 cfs @ 12.23 hrs, Volume= 21.250 af, Depth> 3.70"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
41.298
70
Woods, Good, HSG C
27.532
55
Woods, Good, HSG B
68.830
64
Weighted Average
68.830
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
14.2 100
0.0542
0.12
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
13.9 1,342
0.1040
1.61
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
28.1 1,442 Total
240
220
200
180
160
140
0 120
FL 100
80
60
40
20
0
Subcatchment 11: DA 11
Hydrograph
229.53 cfs
Type -ill 2". r -
100 ars� 2" Rainfall=79,4"
Run ff Are=68.8'30 ac
—
Run�ff Volume=2I1.250 f
Runoff [Ye-pth—>3.70—
FloW Length=l-,442'
Tc=28.1 min
CN=44
1 7
7
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 28
Hydrograph for Subcatchment 11: DA 11
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.11
9.50
1.29
0.00
0.40
9.75
1.36
0.01
0.75
10.00
1.44
0.02
1.20
10.25
1.52
0.03
1.79
10.50
1.62
0.04
2.58
10.75
1.73
0.06
3.63
11.00
1.87
0.09
5.10
11.25
2.03
0.13
7.16
11.50
2.25
0.19
10.59
11.75
3.07
0.50
20.32
12.00
5.26
1.75
104.39
12.25
5.61
1.99
228.05
12.50
5.84
2.15
123.58
12.75
6.00
2.26
64.54
13.00
6.13
2.36
40.22
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
29.93
13.50
6.34
2.51
24.28
13.75
6.43
2.58
21.08
14.00
6.51
2.63
18.62
14.25
6.58
2.69
16.60
14.50
6.65
2.74
15.19
14.75
6.72
2.79
14.32
15.00
6.78
2.83
13.60
15.25
6.83
2.88
12.92
15.50
6.89
2.92
12.24
15.75
6.94
2.96
11.55
16.00
6.99
2.99
10.86
16.25
7.03
3.03
10.17
16.50
7.08
3.06
9.68
16.75
7.12
3.09
9.36
17.00
7.16
3.12
9.10
17.25
7.20
3.15
8.85
17.50
7.24
3.18
8.60
17.75
7.28
3.21
8.36
18.00
7.31
3.24
8.11
18.25
7.35
3.27
7.86
18.50
7.38
3.29
7.60
18.75
7.41
3.32
7.35
19.00
7.45
3.34
7.09
19.25
7.48
3.37
6.84
19.50
7.50
3.39
6.58
19.75
7.53
3.41
6.32
20.00
7.56
3.43
6.06
20.25
7.58
3.45
5.81
20.50
7.61
3.47
5.64
20.75
7.64
3.49
5.56
21.00
7.66
3.51
5.50
21.25
7.68
3.53
5.45
21.50
7.71
3.55
5.40
21.75
7.73
3.57
5.35
22.00
7.76
3.59
5.31
22.25
7.78
3.61
5.26
22.50
7.80
3.63
5.21
22.75
7.83
3.64
5.16
23.00
7.85
3.66
5.11
23.25
7.87
3.68
5.06
23.50
7.90
3.70
5.01
23.75
7.92
3.72
4.96
24.00
7.94
3.73
4.91

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 29
Summary for Subcatchment 12: DA 12
Runoff = 112.70 cfs @ 12.08 hrs, Volume= 7.472 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
14.468
70
Woods, Good, HSG C
9.646
55
Woods, Good, HSG B
24.114
64
Weighted Average
24.114
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
9.9 100
0.1343
0.17
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
5.8 595
0.1187
1.72
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
15.7 695 Total
120
110
100
90
N 80
70
3 60
FZ 50
40
30
20
10
0
Subcatchment 12: DA 12
Hydrograph
112.70 cfs
Type�ll 24-fir
100- tears — 24-hrs Rainfatl=7 ,4"
Runoff Are=24.`IIU ac
Runoff Volume=7I.472 aft
Runoff Depth>3.72"
Flow-Length=695'
Tc=15.7 -min
CN=64
T T
T
T T
T
— T
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 30
Hydrograph for Subcatchment 12: DA 12
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.01
9.25
1.23
0.00
0.10
9.50
1.29
0.00
0.23
9.75
1.36
0.01
0.37
10.00
1.44
0.02
0.56
10.25
1.52
0.03
0.81
10.50
1.62
0.04
1.15
10.75
1.73
0.06
1.61
11.00
1.87
0.09
2.26
11.25
2.03
0.13
3.22
11.50
2.25
0.19
4.91
11.75
3.07
0.50
14.94
12.00
5.26
1.75
89.59
12.25
5.61
1.99
57.26
12.50
5.84
2.15
21.97
12.75
6.00
2.26
12.93
13.00
6.13
2.36
10.21
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
8.59
13.50
6.34
2.51
7.55
13.75
6.43
2.58
6.66
14.00
6.51
2.63
5.94
14.25
6.58
2.69
5.35
14.50
6.65
2.74
5.05
14.75
6.72
2.79
4.81
15.00
6.78
2.83
4.58
15.25
6.83
2.88
4.34
15.50
6.89
2.92
4.10
15.75
6.94
2.96
3.86
16.00
6.99
2.99
3.62
16.25
7.03
3.03
3.40
16.50
7.08
3.06
3.29
16.75
7.12
3.09
3.21
17.00
7.16
3.12
3.12
17.25
7.20
3.15
3.03
17.50
7.24
3.18
2.95
17.75
7.28
3.21
2.86
18.00
7.31
3.24
2.77
18.25
7.35
3.27
2.68
18.50
7.38
3.29
2.60
18.75
7.41
3.32
2.51
19.00
7.45
3.34
2.42
19.25
7.48
3.37
2.33
19.50
7.50
3.39
2.24
19.75
7.53
3.41
2.14
20.00
7.56
3.43
2.05
20.25
7.58
3.45
1.98
20.50
7.61
3.47
1.95
20.75
7.64
3.49
1.93
21.00
7.66
3.51
1.91
21.25
7.68
3.53
1.90
21.50
7.71
3.55
1.88
21.75
7.73
3.57
1.86
22.00
7.76
3.59
1.85
22.25
7.78
3.61
1.83
22.50
7.80
3.63
1.81
22.75
7.83
3.64
1.79
23.00
7.85
3.66
1.78
23.25
7.87
3.68
1.76
23.50
7.90
3.70
1.74
23.75
7.92
3.72
1.72
24.00
7.94
3.73
1.71

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 31
Summary for Subcatchment 13: DA 13
Runoff = 133.38 cfs @ 12.25 hrs, Volume= 12.908 af, Depth> 3.70"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
25.102
70
Woods, Good, HSG C
16.734
55
Woods, Good, HSG B
41.836
64
Weighted Average
41.836
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
11.4 100
0.0936
0.15
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
18.7 1,561
0.0776
1.39
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
30.1 1,661 Total
140
120
100
80
3
rL 60
40
20
0
0
Subcatchment 13: DA 13
Hydrograph
133.38 cfs
Type II 24-11ir
100 years - 24-hrsRainf� 1=7�4"
Runoff Area=41.836 ac
Runoff Volume=12.908 of
Runoff Depth>3.70"
Flow-Length=1,661'
Tc=30.1 min
C N 14
L I
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 32
Hydrograph for Subcatchment 13: DA 13
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.06
9.50
1.29
0.00
0.22
9.75
1.36
0.01
0.43
10.00
1.44
0.02
0.70
10.25
1.52
0.03
1.04
10.50
1.62
0.04
1.51
10.75
1.73
0.06
2.13
11.00
1.87
0.09
2.99
11.25
2.03
0.13
4.19
11.50
2.25
0.19
6.17
11.75
3.07
0.50
11.42
12.00
5.26
1.75
55.70
12.25
5.61
1.99
133.37
12.50
5.84
2.15
81.61
12.75
6.00
2.26
42.85
13.00
6.13
2.36
26.25
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
19.10
13.50
6.34
2.51
15.31
13.75
6.43
2.58
13.07
14.00
6.51
2.63
11.51
14.25
6.58
2.69
10.24
14.50
6.65
2.74
9.34
14.75
6.72
2.79
8.78
15.00
6.78
2.83
8.32
15.25
6.83
2.88
7.90
15.50
6.89
2.92
7.49
15.75
6.94
2.96
7.07
16.00
6.99
2.99
6.65
16.25
7.03
3.03
6.23
16.50
7.08
3.06
5.92
16.75
7.12
3.09
5.71
17.00
7.16
3.12
5.55
17.25
7.20
3.15
5.40
17.50
7.24
3.18
5.25
17.75
7.28
3.21
5.10
18.00
7.31
3.24
4.94
18.25
7.35
3.27
4.79
18.50
7.38
3.29
4.64
18.75
7.41
3.32
4.49
19.00
7.45
3.34
4.33
19.25
7.48
3.37
4.17
19.50
7.50
3.39
4.02
19.75
7.53
3.41
3.86
20.00
7.56
3.43
3.70
20.25
7.58
3.45
3.55
20.50
7.61
3.47
3.44
20.75
7.64
3.49
3.38
21.00
7.66
3.51
3.35
21.25
7.68
3.53
3.32
21.50
7.71
3.55
3.29
21.75
7.73
3.57
3.26
22.00
7.76
3.59
3.23
22.25
7.78
3.61
3.20
22.50
7.80
3.63
3.17
22.75
7.83
3.64
3.14
23.00
7.85
3.66
3.11
23.25
7.87
3.68
3.08
23.50
7.90
3.70
3.05
23.75
7.92
3.72
3.02
24.00
7.94
3.73
2.99

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 33
Summary for Subcatchment 14: DA 14
Runoff = 4.92 cfs @ 12.08 hrs, Volume= 0.326 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
0.632
70 Woods, Good, HSG C
0.421
55 Woods, Good, HSG B
1.053
64 Weighted Average
1.053
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
13.3 100
0.0630
0.12
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
2.4 229
0.1036
1.61
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
15.7 329 Total
3
3
0
2
il
Subcatchment 14: DA 14
Hydrograph
4.92 cfs
Type II 24-hr
100 years - 24 hrs Rainfall=7.94"
Runoff Area=1.053 ac
Runoff Volume=0.326 of
Runoff Depth>3.72"
Flow Length=329'
Tc=15.7 min
CN=64
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 34
Hydrograph for Subcatchment 14: DA 14
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.00
9.50
1.29
0.00
0.01
9.75
1.36
0.01
0.02
10.00
1.44
0.02
0.02
10.25
1.52
0.03
0.04
10.50
1.62
0.04
0.05
10.75
1.73
0.06
0.07
11.00
1.87
0.09
0.10
11.25
2.03
0.13
0.14
11.50
2.25
0.19
0.21
11.75
3.07
0.50
0.65
12.00
5.26
1.75
3.91
12.25
5.61
1.99
2.50
12.50
5.84
2.15
0.96
12.75
6.00
2.26
0.56
13.00
6.13
2.36
0.45
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
0.38
13.50
6.34
2.51
0.33
13.75
6.43
2.58
0.29
14.00
6.51
2.63
0.26
14.25
6.58
2.69
0.23
14.50
6.65
2.74
0.22
14.75
6.72
2.79
0.21
15.00
6.78
2.83
0.20
15.25
6.83
2.88
0.19
15.50
6.89
2.92
0.18
15.75
6.94
2.96
0.17
16.00
6.99
2.99
0.16
16.25
7.03
3.03
0.15
16.50
7.08
3.06
0.14
16.75
7.12
3.09
0.14
17.00
7.16
3.12
0.14
17.25
7.20
3.15
0.13
17.50
7.24
3.18
0.13
17.75
7.28
3.21
0.12
18.00
7.31
3.24
0.12
18.25
7.35
3.27
0.12
18.50
7.38
3.29
0.11
18.75
7.41
3.32
0.11
19.00
7.45
3.34
0.11
19.25
7.48
3.37
0.10
19.50
7.50
3.39
0.10
19.75
7.53
3.41
0.09
20.00
7.56
3.43
0.09
20.25
7.58
3.45
0.09
20.50
7.61
3.47
0.09
20.75
7.64
3.49
0.08
21.00
7.66
3.51
0.08
21.25
7.68
3.53
0.08
21.50
7.71
3.55
0.08
21.75
7.73
3.57
0.08
22.00
7.76
3.59
0.08
22.25
7.78
3.61
0.08
22.50
7.80
3.63
0.08
22.75
7.83
3.64
0.08
23.00
7.85
3.66
0.08
23.25
7.87
3.68
0.08
23.50
7.90
3.70
0.08
23.75
7.92
3.72
0.08
24.00
7.94
3.73
0.07

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 35
Summary for Subcatchment 15: DA 15
Runoff = 37.71 cfs @ 12.04 hrs, Volume= 2.214 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
4.282
70 Woods, Good, HSG C
2.855
55 Woods, Good, HSG B
7.137
64 Weighted Average
7.137
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
7.3 100
0.2842
0.23
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
4.8 532
0.1367
1.85
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
12.1 632 Total
4
3
3
Subcatchment 15: DA 15
Hydrograph
37.71 cfs
Type II 24-h r
100 ears - 24 hrsl Rainf111=7.94 "
-Ruzff Are 7.13Zac
Run?ff Volume=2.214 of
-Runoff Depth->3.7
Flo* Length=632'I
Tc=12.1 min — — — — - - -
CN=64
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 36
Hydrograph for Subcatchment 15: DA 15
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.04
9.50
1.29
0.00
0.08
9.75
1.36
0.01
0.12
10.00
1.44
0.02
0.18
10.25
1.52
0.03
0.26
10.50
1.62
0.04
0.37
10.75
1.73
0.06
0.51
11.00
1.87
0.09
0.72
11.25
2.03
0.13
1.04
11.50
2.25
0.19
1.58
11.75
3.07
0.50
6.09
12.00
5.26
1.75
34.68
12.25
5.61
1.99
11.88
12.50
5.84
2.15
5.34
12.75
6.00
2.26
3.49
13.00
6.13
2.36
2.89
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
2.46
13.50
6.34
2.51
2.17
13.75
6.43
2.58
1.92
14.00
6.51
2.63
1.71
14.25
6.58
2.69
1.55
14.50
6.65
2.74
1.48
14.75
6.72
2.79
1.41
15.00
6.78
2.83
1.34
15.25
6.83
2.88
1.27
15.50
6.89
2.92
1.20
15.75
6.94
2.96
1.13
16.00
6.99
2.99
1.05
16.25
7.03
3.03
1.00
16.50
7.08
3.06
0.97
16.75
7.12
3.09
0.94
17.00
7.16
3.12
0.92
17.25
7.20
3.15
0.89
17.50
7.24
3.18
0.87
17.75
7.28
3.21
0.84
18.00
7.31
3.24
0.81
18.25
7.35
3.27
0.79
18.50
7.38
3.29
0.76
18.75
7.41
3.32
0.74
19.00
7.45
3.34
0.71
19.25
7.48
3.37
0.68
19.50
7.50
3.39
0.66
19.75
7.53
3.41
0.63
20.00
7.56
3.43
0.60
20.25
7.58
3.45
0.58
20.50
7.61
3.47
0.58
20.75
7.64
3.49
0.57
21.00
7.66
3.51
0.57
21.25
7.68
3.53
0.56
21.50
7.71
3.55
0.56
21.75
7.73
3.57
0.55
22.00
7.76
3.59
0.55
22.25
7.78
3.61
0.54
22.50
7.80
3.63
0.53
22.75
7.83
3.64
0.53
23.00
7.85
3.66
0.52
23.25
7.87
3.68
0.52
23.50
7.90
3.70
0.51
23.75
7.92
3.72
0.51
24.00
7.94
3.73
0.50

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 37
Summary for Subcatchment 16: DA 16
Runoff = 6.30 cfs @ 12.01 hrs, Volume= 0.341 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
0.660
70
Woods, Good, HSG C
0.440
55
Woods, Good, HSG B
1.100
64
Weighted Average
1.100
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
8.4 100
0.2027
0.20
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
1.3 80
0.0443
1.05
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
9.7 180 Total
7
6
5--
4-
2 3
U-
2
1
0
0
Subcatchment 16: DA 16
Hydrograph
6.30 cfs
Type II 24-hr
100 years - 24 hrsl Rainfa11=7.94"
Runoff Areaa=1.100 ac
Runoff Volume=0:341 of
Runoff Depth>3.72"
Flow Length=180'I
Tc=9.7 min
EN=64
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 38
Hydrograph for Subcatchment 16: DA 16
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.01
9.50
1.29
0.00
0.01
9.75
1.36
0.01
0.02
10.00
1.44
0.02
0.03
10.25
1.52
0.03
0.04
10.50
1.62
0.04
0.06
10.75
1.73
0.06
0.08
11.00
1.87
0.09
0.12
11.25
2.03
0.13
0.17
11.50
2.25
0.19
0.26
11.75
3.07
0.50
1.18
12.00
5.26
1.75
6.23
12.25
5.61
1.99
1.40
12.50
5.84
2.15
0.74
12.75
6.00
2.26
0.52
13.00
6.13
2.36
0.43
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
0.37
13.50
6.34
2.51
0.33
13.75
6.43
2.58
0.29
14.00
6.51
2.63
0.26
14.25
6.58
2.69
0.24
14.50
6.65
2.74
0.23
14.75
6.72
2.79
0.22
15.00
6.78
2.83
0.20
15.25
6.83
2.88
0.19
15.50
6.89
2.92
0.18
15.75
6.94
2.96
0.17
16.00
6.99
2.99
0.16
16.25
7.03
3.03
0.15
16.50
7.08
3.06
0.15
16.75
7.12
3.09
0.14
17.00
7.16
3.12
0.14
17.25
7.20
3.15
0.14
17.50
7.24
3.18
0.13
17.75
7.28
3.21
0.13
18.00
7.31
3.24
0.12
18.25
7.35
3.27
0.12
18.50
7.38
3.29
0.12
18.75
7.41
3.32
0.11
19.00
7.45
3.34
0.11
19.25
7.48
3.37
0.10
19.50
7.50
3.39
0.10
19.75
7.53
3.41
0.10
20.00
7.56
3.43
0.09
20.25
7.58
3.45
0.09
20.50
7.61
3.47
0.09
20.75
7.64
3.49
0.09
21.00
7.66
3.51
0.09
21.25
7.68
3.53
0.09
21.50
7.71
3.55
0.09
21.75
7.73
3.57
0.08
22.00
7.76
3.59
0.08
22.25
7.78
3.61
0.08
22.50
7.80
3.63
0.08
22.75
7.83
3.64
0.08
23.00
7.85
3.66
0.08
23.25
7.87
3.68
0.08
23.50
7.90
3.70
0.08
23.75
7.92
3.72
0.08
24.00
7.94
3.73
0.08

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 39
Summary for Subcatchment 17: DA 17
Runoff = 17.91 cfs @ 12.09 hrs, Volume= 1.208 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
2.339
70 Woods, Good, HSG C
1.559
55 Woods, Good, HSG B
3.898
64 Weighted Average
3.898
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
13.1 100
0.0654
0.13
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
3.2 208
0.0462
1.07
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
M011-311111111[*M.
2
1
1
1
3 1
0
FL
Subcatchment 17: DA 17
Hydrograph
0--
17.91
cfs
8
Type) 1124-hr
6
0 arm 24-hrslRain
Runoff Are=3.898
1=7-4A"
4
ac
Run?ff Volume=1.208 of
2
-Runoff Depth>3.7
— — —
Flowl Length=308'I
c 16.3 min
8
CN14
6
4
-
—I -
-
2
-
0
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 40
Hydrograph for Subcatchment 17: DA 17
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.02
9.50
1.29
0.00
0.04
9.75
1.36
0.01
0.06
10.00
1.44
0.02
0.09
10.25
1.52
0.03
0.13
10.50
1.62
0.04
0.18
10.75
1.73
0.06
0.26
11.00
1.87
0.09
0.36
11.25
2.03
0.13
0.51
11.50
2.25
0.19
0.78
11.75
3.07
0.50
2.30
12.00
5.26
1.75
13.84
12.25
5.61
1.99
9.72
12.50
5.84
2.15
3.68
12.75
6.00
2.26
2.14
13.00
6.13
2.36
1.66
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
1.40
13.50
6.34
2.51
1.23
13.75
6.43
2.58
1.08
14.00
6.51
2.63
0.96
14.25
6.58
2.69
0.87
14.50
6.65
2.74
0.82
14.75
6.72
2.79
0.78
15.00
6.78
2.83
0.74
15.25
6.83
2.88
0.70
15.50
6.89
2.92
0.66
15.75
6.94
2.96
0.63
16.00
6.99
2.99
0.59
16.25
7.03
3.03
0.55
16.50
7.08
3.06
0.53
16.75
7.12
3.09
0.52
17.00
7.16
3.12
0.50
17.25
7.20
3.15
0.49
17.50
7.24
3.18
0.48
17.75
7.28
3.21
0.46
18.00
7.31
3.24
0.45
18.25
7.35
3.27
0.43
18.50
7.38
3.29
0.42
18.75
7.41
3.32
0.41
19.00
7.45
3.34
0.39
19.25
7.48
3.37
0.38
19.50
7.50
3.39
0.36
19.75
7.53
3.41
0.35
20.00
7.56
3.43
0.33
20.25
7.58
3.45
0.32
20.50
7.61
3.47
0.32
20.75
7.64
3.49
0.31
21.00
7.66
3.51
0.31
21.25
7.68
3.53
0.31
21.50
7.71
3.55
0.30
21.75
7.73
3.57
0.30
22.00
7.76
3.59
0.30
22.25
7.78
3.61
0.30
22.50
7.80
3.63
0.29
22.75
7.83
3.64
0.29
23.00
7.85
3.66
0.29
23.25
7.87
3.68
0.28
23.50
7.90
3.70
0.28
23.75
7.92
3.72
0.28
24.00
7.94
3.73
0.28

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 41
Summary for Reach 1-1: 1-1
Inflow Area = 135.498 ac, 0.00% Impervious, Inflow Depth > 4.86" for 100 years - 24 hrs event
Inflow = 975.62 cfs @ 12.02 hrs, Volume= 54.893 of
Outflow = 802.45 cfs @ 12.19 hrs, Volume= 54.377 af, Atten= 18%, Lag= 10.4 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 6.60 fps, Min. Travel Time= 6.6 min
Avg. Velocity = 1.95 fps, Avg. Travel Time= 22.4 min
Peak Storage= 321,191 cf @ 12.08 hrs
Average Depth at Peak Storage= 3.88'
Bank -Full Depth= 9.00' Flow Area= 613.7 sf, Capacity= 4,320.05 cfs
Custom cross-section, Length= 2,618.0' Slope= 0.0104 T (103 Elevation Intervals)
Constant n= 0.045
Inlet Invert= 760.00', Outlet Invert= 732.74'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
-71.43
9.00
0.00
0.00
7.00
2.00
10.00
6.72
2.28
35.71
6.00
3.00
53.71
0.00
9.00
73.71
0.00
9.00
91.71
6.00
3.00
129.68
9.00
0.00
Depth End Area
Perim.
Storage
Discharge
(feet)
(sq-ft)
(feet)
(cubic -feet)
(cfs)
0.00
0.0
20.0
0
0.00
6.00
228.0
57.9
596,904
1,914.79
6.72
280.9
92.8
735,282
1,980.00
7.00
308.2
106.4
806,822
2,110.53
9.00
613.7
203.2
1,606,560
4,320.05

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 42
1,000
900
800
^, 700
600
_0 500
400
300
200
100
0
Reach 1-1: 1-1
Hydrograph
975.62 cfs
lnfllow-Area�1-5.498 g02.45 cfs
Avg. Few Dpptth�
Max Ve =6.6Q fps,
n4-04
L=2,61 0.0' I - I -
Capacity=A, 21. 5-cf�-
rI-
L
- I
-
-4
—�—
�—
-
-t
1
� _I
_ I_ L
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
Inflow
— Outflow

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 43
Hydrograph for Reach 1-1: 1-1
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
760.00
0.00
0.50
0.00
0
760.00
0.00
1.00
0.00
0
760.00
0.00
1.50
0.00
0
760.00
0.00
2.00
0.00
0
760.00
0.00
2.50
0.00
0
760.00
0.00
3.00
0.00
0
760.00
0.00
3.50
0.00
0
760.00
0.00
4.00
0.00
0
760.00
0.00
4.50
0.00
0
760.00
0.00
5.00
0.00
0
760.00
0.00
5.50
0.00
0
760.00
0.00
6.00
0.00
0
760.00
0.00
6.50
0.00
0
760.00
0.00
7.00
0.69
430
760.01
0.06
7.50
1.67
2,015
760.04
0.40
8.00
2.72
4,480
760.08
0.99
8.50
4.34
7,354
760.14
2.27
9.00
6.74
10,793
760.20
4.14
9.50
8.77
14,083
760.26
6.73
10.00
12.18
17,196
760.31
9.23
10.50
18.44
22,253
760.40
13.64
11.00
29.48
30,033
760.53
21.61
11.50
55.60
44,431
760.76
38.10
12.00
961.94
273,906
763.45
304.00
12.50
112.11
105,937
761.63
233.98
13.00
63.41
61,495
761.02
81.33
13.50
47.52
49,348
760.84
55.52
14.00
37.36
42,076
760.72
42.98
14.50
32.34
37,361
760.65
34.97
15.00
29.19
34,887
760.61
31.20
15.50
26.01
32,511
760.57
28.04
16.00
22.79
30,100
760.53
24.84
16.50
20.98
28,077
760.50
22.11
17.00
19.84
26,981
760.48
20.65
17.50
18.70
26,022
760.46
19.48
18.00
17.55
25,072
760.45
18.33
18.50
16.39
24,044
760.43
17.23
19.00
15.22
22,970
760.41
16.08
19.50
14.04
21,885
760.39
14.91
20.00
12.86
20,794
760.38
13.73
20.50
12.33
19,972
760.36
12.71
21.00
12.11
19,638
760.36
12.32
21.50
11.88
19,378
760.35
12.07
22.00
11.65
19,130
760.35
11.84
22.50
11.42
18,884
760.34
11.61
23.00
11.19
18,637
760.34
11.38
23.50
10.96
18,389
760.33
11.15
24.00
10.73
18,140
760.33
10.92

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 44
Summary for Reach 2-1: 2-1
Inflow Area = 151.446 ac, 4.64% Impervious, Inflow Depth > 4.56" for 100 years - 24 hrs event
Inflow = 654.14 cfs @ 12.15 hrs, Volume= 57.562 of
Outflow = 589.00 cfs @ 12.36 hrs, Volume= 56.995 af, Atten= 10%, Lag= 12.8 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 6.03 fps, Min. Travel Time= 7.3 min
Avg. Velocity = 1.91 fps, Avg. Travel Time= 23.0 min
Peak Storage= 258,934 cf @ 12.24 hrs
Average Depth at Peak Storage= 3.29'
Bank -Full Depth= 9.00' Flow Area= 588.5 sf, Capacity= 4,252.14 cfs
Custom cross-section, Length= 2,636.0' Slope= 0.0103 T (101 Elevation Intervals)
Constant n= 0.045
Inlet Invert= 760.00', Outlet Invert= 732.74'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
0.00
9.00
0.00
96.77
6.00
3.00
114.77
0.00
9.00
134.77
0.00
9.00
152.77
6.00
3.00
184.35
9.00
0.00
Depth End Area
Perim.
Storage
Discharge
(feet)
(sq-ft)
(feet)
(cubic -feet)
(cfs)
0.00
0.0
20.0
0
0.00
6.00
228.0
57.9
601,008
1,908.24
9.00
588.5
186.5
1,551,352
4,252.14

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 45
Reach 2-1: 2-1
Hydrograph
700 654.14 cfs — Inflow
f1514 589.00 cfs 1 — Outflow
600 now►rea= - -
Av�. Flbw Qepthl=3.29'
500 -Mai V—e'=6.93-fp�
400n=1-04� 1
L=2,636.0300-
Capacity=4,1252.�14 cfs
200 - -
100- -I
0
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 46
Hydrograph for Reach 2-1: 2-1
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
760.00
0.00
0.50
0.00
0
760.00
0.00
1.00
0.00
0
760.00
0.00
1.50
0.00
0
760.00
0.00
2.00
0.00
0
760.00
0.00
2.50
0.00
0
760.00
0.00
3.00
0.00
0
760.00
0.00
3.50
0.00
0
760.00
0.00
4.00
0.00
0
760.00
0.00
4.50
0.00
0
760.00
0.00
5.00
0.00
0
760.00
0.00
5.50
0.00
0
760.00
0.00
6.00
0.11
58
760.00
0.01
6.50
0.32
352
760.01
0.07
7.00
0.54
850
760.02
0.18
7.50
0.78
1,499
760.03
0.34
8.00
1.34
2,411
760.05
0.54
8.50
2.62
4,370
760.08
0.95
9.00
4.65
7,539
760.14
2.24
9.50
6.91
11,255
760.21
4.36
10.00
9.58
14,567
760.27
6.83
10.50
14.73
19,112
760.34
10.43
11.00
23.71
26,010
760.46
16.73
11.50
43.15
37,693
760.65
28.94
12.00
443.95
143,532
762.08
112.74
12.50
261.67
182,631
762.52
495.24
13.00
89.34
83,367
761.32
142.45
13.50
57.64
57,628
760.96
72.24
14.00
44.57
47,646
760.81
51.93
14.50
36.74
41,386
760.71
41.01
15.00
32.99
38,050
760.66
35.41
15.50
29.56
35,549
760.62
31.76
16.00
26.10
32,973
760.58
28.39
16.50
23.39
30,585
760.54
25.05
17.00
22.03
29,133
760.51
23.04
17.50
20.79
28,045
760.49
21.68
18.00
19.55
27,009
760.48
20.43
18.50
18.31
25,971
760.46
19.19
19.00
17.05
24,912
760.44
17.95
19.50
15.78
23,756
760.42
16.74
20.00
14.50
22,568
760.40
15.48
20.50
13.57
21,490
760.39
14.25
21.00
13.27
20,967
760.38
13.55
21.50
13.02
20,686
760.37
13.22
22.00
12.78
20,450
760.37
12.97
22.50
12.53
20,220
760.36
12.72
23.00
12.29
19,989
760.36
12.47
23.50
12.04
19,736
760.36
12.24
24.00
11.79
19,469
760.35
12.00

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 47
Summary for Reach 3-1: 3-1
Inflow Area = 286.944 ac, 2.45% Impervious, Inflow Depth > 4.66" for 100 years - 24 hrs event
Inflow = 1,223.94 cfs @ 12.23 hrs, Volume= 111.373 of
Outflow = 1,220.77 cfs @ 12.24 hrs, Volume= 111.333 af, Atten= 0%, Lag= 0.5 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 6.89 fps, Min. Travel Time= 0.2 min
Avg. Velocity = 2.00 fps, Avg. Travel Time= 0.8 min
Peak Storage= 17,742 cf @ 12.23 hrs
Average Depth at Peak Storage= 3.51'
Bank -Full Depth= 9.00' Flow Area= 667.8 sf, Capacity= 6,464.84 cfs
Custom cross-section
Constant n= 0.045
Inlet Invert= 732.74',
Length= 100.0' Slope= 0.0108 T (101 Elevation Intervals)
Outlet Invert= 731.66'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
0.00
9.00
0.00
29.90
6.10
2.90
48.20
0.00
9.00
88.20
0.00
9.00
106.50
6.10
2.90
138.72
9.00
0.00
Depth End Area
Perim.
Storage
Discharge
(feet)
(sq-ft)
(feet)
(cubic -feet)
(cfs)
0.00
0.0
40.0
0
0.00
6.10
355.6
78.6
35,563
3,339.19
9.00
667.8
141.0
66,784
6,464.84

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 48
Reach 3-1: 3-1
Hydrograph
1,220.77 cfs
1,200 Inflow �►rea�286.1944 ac
1,000 Avg. Flow Depth=3.51'
Max Ve =6.8� fps,
N n=0.04�
800 L=100.0'
0 600 S � 01�8 T
M Capacity=6,464.84 cfs
Ann 1 � L
0
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
Inflow
Outflow

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 49
Hydrograph for Reach 3-1: 3-1
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
732.74
0.00
0.50
0.00
0
732.74
0.00
1.00
0.00
0
732.74
0.00
1.50
0.00
0
732.74
0.00
2.00
0.00
0
732.74
0.00
2.50
0.00
0
732.74
0.00
3.00
0.00
0
732.74
0.00
3.50
0.00
0
732.74
0.00
4.00
0.00
0
732.74
0.00
4.50
0.00
0
732.74
0.00
5.00
0.00
0
732.74
0.00
5.50
0.00
0
732.74
0.00
6.00
0.01
1
732.74
0.00
6.50
0.07
9
732.74
0.06
7.00
0.24
31
732.75
0.21
7.50
0.74
101
732.77
0.69
8.00
1.53
212
732.79
1.45
8.50
3.22
407
732.84
3.12
9.00
6.38
615
732.89
6.18
9.50
11.10
878
732.96
10.92
10.00
16.07
1,116
733.01
15.89
10.50
24.08
1,426
733.09
23.76
11.00
38.34
1,903
733.20
37.88
11.50
67.04
2,688
733.38
66.08
12.00
416.73
8,497
734.60
396.11
12.50
729.22
12,583
735.37
743.48
13.00
223.78
5,811
734.06
227.16
13.50
127.76
4,059
733.69
128.72
14.00
94.91
3,365
733.53
95.41
14.50
75.98
2,926
733.44
76.28
15.00
66.62
2,695
733.38
66.77
15.50
59.80
2,518
733.34
59.94
16.00
53.23
2,343
733.30
53.38
16.50
47.16
2,174
733.26
47.28
17.00
43.69
2,071
733.24
43.76
17.50
41.16
1,996
733.22
41.22
18.00
38.76
1,925
733.20
38.82
18.50
36.42
1,855
733.19
36.48
19.00
34.03
1,775
733.17
34.09
19.50
31.65
1,696
733.15
31.71
20.00
29.21
1,614
733.13
29.27
20.50
26.96
1,539
733.11
27.00
21.00
25.87
1,502
733.11
25.89
21.50
25.29
1,482
733.10
25.31
22.00
24.81
1,464
733.10
24.82
22.50
24.33
1,445
733.09
24.34
23.00
23.86
1,427
733.09
23.87
23.50
23.40
1,409
733.08
23.41
24.00
22.92
1,390
733.08
22.94

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 50
Summary for Reach 3-2: DA 3-2
Inflow Area = 380.244 ac, 1.85% Impervious, Inflow Depth > 4.73" for 100 years - 24 hrs event
Inflow = 1,663.43 cfs @ 12.22 hrs, Volume= 149.907 of
Outflow = 1,589.17 cfs @ 12.33 hrs, Volume= 149.096 af, Atten= 4%, Lag= 6.8 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 7.41 fps, Min. Travel Time= 3.8 min
Avg. Velocity = 2.20 fps, Avg. Travel Time= 12.7 min
Peak Storage= 364,995 cf @ 12.27 hrs
Average Depth at Peak Storage= 4.13'
Bank -Full Depth= 9.00' Flow Area= 667.8 sf, Capacity= 6,336.03 cfs
Custom cross-section
Constant n= 0.045
Inlet Invert= 732.74',
Length= 1,685.0' Slope= 0.0104 T (101 Elevation Intervals)
Outlet Invert= 715.26'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
0.00
9.00
0.00
29.90
6.10
2.90
48.20
0.00
9.00
88.20
0.00
9.00
106.50
6.10
2.90
138.72
9.00
0.00
Depth End Area
Perim.
Storage
Discharge
(feet)
(sq-ft)
(feet)
(cubic -feet)
(cfs)
0.00
0.0
40.0
0
0.00
6.10
355.6
78.6
599,237
3,272.66
9.00
667.8
141.0
1,125,317
6,336.03

Existing Conditions Type 1124-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 51
1,800
1,600
1,400
1,200
1,000
3 0 800
FL
• 11]
� 11]
MEER U111i
0
Reach 3-2: DA 3-2
Hydrograph
1,589.17 cfs
1n& w kaaa 380.1244 c
-4
Avg. Few-Dppth�Al:�L
-4
MaVel=7.41 fp
L=4-,685.0' 1 I
S- .01 4 '/'I I
p y=6,336.03
C c ti cf�-
- + -f I I -
I-
- t-f I I t- I
I
fi-t
I
-t-fII�--
--fI
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
Inflow
— Outflow

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 52
Hydrograph for Reach 3-2: DA 3-2
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
732.74
0.00
0.50
0.00
0
732.74
0.00
1.00
0.00
0
732.74
0.00
1.50
0.00
0
732.74
0.00
2.00
0.00
0
732.74
0.00
2.50
0.00
0
732.74
0.00
3.00
0.00
0
732.74
0.00
3.50
0.00
0
732.74
0.00
4.00
0.00
0
732.74
0.00
4.50
0.00
0
732.74
0.00
5.00
0.00
0
732.74
0.00
5.50
0.00
0
732.74
0.00
6.00
0.00
1
732.74
0.00
6.50
0.09
45
732.74
0.01
7.00
0.76
556
732.75
0.18
7.50
1.90
2,025
732.77
0.71
8.00
3.40
4,470
732.81
1.64
8.50
6.03
7,867
732.86
3.54
9.00
10.65
12,220
732.92
7.12
9.50
17.04
17,593
733.00
13.29
10.00
23.82
22,447
733.06
20.10
10.50
35.40
28,646
733.15
29.57
11.00
55.91
38,113
733.28
46.35
11.50
97.66
53,671
733.49
78.87
12.00
687.68
161,644
734.82
312.86
12.50
910.92
271,226
735.98
1,215.81
13.00
283.05
124,822
734.39
362.27
13.50
165.71
85,165
733.90
187.27
14.00
124.05
69,972
733.71
134.62
14.50
99.87
60,616
733.59
106.42
15.00
87.97
55,484
733.52
91.50
15.50
78.92
51,848
733.47
81.98
16.00
70.12
48,266
733.42
73.30
16.50
62.26
44,776
733.37
64.79
17.00
57.88
42,512
733.34
59.38
17.50
54.54
40,911
733.32
55.79
18.00
51.34
39,436
733.30
52.56
18.50
48.19
37,989
733.28
49.39
19.00
44.99
36,424
733.26
46.29
19.50
41.80
34,810
733.24
43.11
20.00
38.54
33,164
733.22
39.87
20.50
35.67
31,601
733.19
36.71
21.00
34.37
30,682
733.18
34.87
21.50
33.63
30,184
733.17
33.95
22.00
32.98
29,799
733.17
33.27
22.50
32.35
29,433
733.16
32.63
23.00
31.71
29,069
733.16
32.00
23.50
31.09
28,709
733.15
31.37
24.00
30.46
28,347
733.15
30.74

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 53
Summary for Reach 4-1: 4-1
Inflow Area = 48.550 ac, 18.39% Impervious, Inflow Depth > 5.80" for 100 years - 24 hrs event
Inflow = 481.89 cfs @ 11.95 hrs, Volume= 23.460 of
Outflow = 373.95 cfs @ 12.12 hrs, Volume= 23.265 af, Atten= 22%, Lag= 9.8 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 6.27 fps, Min. Travel Time= 6.6 min
Avg. Velocity = 1.85 fps, Avg. Travel Time= 22.5 min
Peak Storage= 151,964 cf @ 12.01 hrs
Average Depth at Peak Storage= 3.14'
Bank -Full Depth= 9.00' Flow Area= 512.3 sf, Capacity= 3,928.79 cfs
Custom cross-section, Length= 2,493.0' Slope= 0.0139 T (101 Elevation Intervals)
Constant n= 0.045
Inlet Invert= 750.00', Outlet Invert= 715.26'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
0.00
9.00
0.00
100.00
6.00
3.00
118.00
0.00
9.00
128.00
0.00
9.00
146.00
6.00
3.00
183.50
9.00
0.00
Depth End Area
Perim.
Storage
Discharge
(feet)
(sq-ft)
(feet)
(cubic -feet)
(cfs)
0.00
0.0
10.0
0
0.00
6.00
168.0
47.9
418,824
1,510.77
9.00
512.3
185.6
1,277,039
3,928.79

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 54
500
450
400
350
4 300
0 250
" 200
150
100
50
0
Reach 4-1: 4-1
Hydrograph
481.89 cfs
-A�f "ri 1a=4i5501- c
I 1 373.95 cfs rimmin fh=,q i14'
ep
"x-/eL=�.27 fps
0. 45
S=01.013� T
gapa¢1ty=P,920.79 pfs
IL—L11
�Ia-4i
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Inflow
— Outflow

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 55
Hydrograph for Reach 4-1: 4-1
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
750.00
0.00
0.50
0.00
0
750.00
0.00
1.00
0.00
0
750.00
0.00
1.50
0.00
0
750.00
0.00
2.00
0.00
0
750.00
0.00
2.50
0.00
0
750.00
0.00
3.00
0.00
0
750.00
0.00
3.50
0.00
0
750.00
0.00
4.00
0.00
0
750.00
0.00
4.50
0.00
0
750.00
0.00
5.00
0.28
180
750.01
0.03
5.50
0.64
759
750.03
0.19
6.00
1.04
1,618
750.06
0.43
6.50
1.46
2,645
750.10
0.79
7.00
1.91
3,491
750.13
1.36
7.50
2.37
4,246
750.16
1.86
8.00
2.86
4,976
750.19
2.36
8.50
3.88
5,853
750.22
3.05
9.00
5.20
7,151
750.27
4.12
9.50
5.91
8,221
750.30
5.33
10.00
7.84
9,468
750.34
6.44
10.50
11.10
11,774
750.42
8.88
11.00
16.71
15,347
750.53
13.08
11.50
30.14
22,298
750.73
21.97
12.00
409.05
151,709
753.14
222.98
12.50
37.21
37,020
751.11
68.95
13.00
23.29
23,318
750.76
29.51
13.50
17.70
18,854
750.64
20.77
14.00
13.92
16,020
750.55
16.13
14.50
12.32
14,324
750.50
13.29
15.00
11.08
13,342
750.47
11.88
15.50
9.83
12,412
750.44
10.63
16.00
8.57
11,406
750.41
9.42
16.50
8.00
10,688
750.38
8.40
17.00
7.55
10,283
750.37
7.87
17.50
7.11
9,912
750.36
7.41
18.00
6.66
9,511
750.35
6.98
18.50
6.20
9,091
750.33
6.54
19.00
5.75
8,667
750.32
6.09
19.50
5.30
8,241
750.30
5.64
20.00
4.84
7,815
750.29
5.18
20.50
4.70
7,535
750.28
4.82
21.00
4.61
7,421
750.27
4.68
21.50
4.52
7,333
750.27
4.59
22.00
4.43
7,247
750.27
4.50
22.50
4.34
7,150
750.27
4.42
23.00
4.25
7,049
750.26
4.33
23.50
4.16
6,947
750.26
4.24
24.00
4.06
6,843
750.25
4.15

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 56
Summary for Reach 5-1: 5-1
Inflow Area = 428.794 ac, 3.72% Impervious, Inflow Depth > 4.82" for 100 years - 24 hrs event
Inflow = 1,725.47 cfs @ 12.32 hrs, Volume= 172.361 of
Outflow = 1,720.11 cfs @ 12.32 hrs, Volume= 172.296 af, Atten= 0%, Lag= 0.5 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 7.00 fps, Min. Travel Time= 0.3 min
Avg. Velocity = 2.08 fps, Avg. Travel Time= 0.9 min
Peak Storage= 28,306 cf @ 12.32 hrs
Average Depth at Peak Storage= 4.58'
Bank -Full Depth= 10.00' Flow Area= 823.4 sf, Capacity= 7,199.07 cfs
Custom cross-section
Constant n= 0.045
Inlet Invert= 715.26',
Length= 115.0' Slope= 0.0083 '/'
Outlet Invert= 714.31'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
0.00
10.00
0.00
43.33
6.10
3.90
61.63
0.00
10.00
101.63
0.00
10.00
119.93
6.10
3.90
163.26
10.00
0.00
Depth End Area Perim.
Storage
Discharge
(feet)
(sq-ft) (feet)
(cubic -feet)
(cfs)
0.00
0.0 40.0
0
0.00
6.10
355.6 78.6
40,897
2,920.40
10.00
823.4 165.6
94,686
7,199.07

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 57
1,800
1,600
1,400
N 1,200
1,000
3
,° 800
0
Reach 5-1: 5-1
Hydrograph
1,720.11 cfs
lnflow-4 rea�428J94 ac
Avg. Flew Dppth�4.5§ J
=046
Vey=7.OQ fps, L
S==�.00�3 T
Capacity=7,'199.07 cf�
- -4 1 I �
- -4 I 1 4-
+ -i �
IILL-i
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
Inflow
— Outflow

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 58
Hydrograph for Reach 5-1: 5-1
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
715.26
0.00
0.50
0.00
0
715.26
0.00
1.00
0.00
0
715.26
0.00
1.50
0.00
0
715.26
0.00
2.00
0.00
0
715.26
0.00
2.50
0.00
0
715.26
0.00
3.00
0.00
0
715.26
0.00
3.50
0.00
0
715.26
0.00
4.00
0.00
0
715.26
0.00
4.50
0.00
0
715.26
0.00
5.00
0.03
4
715.26
0.02
5.50
0.19
30
715.27
0.16
6.00
0.43
73
715.28
0.40
6.50
0.80
133
715.29
0.74
7.00
1.54
261
715.32
1.45
7.50
2.57
438
715.35
2.44
8.00
4.00
574
715.38
3.90
8.50
6.59
781
715.43
6.37
9.00
11.25
1,102
715.50
11.01
9.50
18.62
1,516
715.58
18.36
10.00
26.54
1,896
715.66
26.23
10.50
38.45
2,381
715.76
37.96
11.00
59.43
3,115
715.91
58.69
11.50
100.84
4,339
716.14
99.36
12.00
535.84
12,565
717.59
506.85
12.50
1,284.76
23,233
719.17
1,309.60
13.00
391.78
10,488
717.24
399.02
13.50
208.03
6,938
716.63
209.97
14.00
150.75
5,641
716.39
151.64
14.50
119.71
4,873
716.25
120.28
15.00
103.38
4,440
716.16
103.67
15.50
92.61
4,139
716.11
92.86
16.00
82.72
3,860
716.05
82.98
16.50
73.19
3,571
716.00
73.40
17.00
67.24
3,390
715.96
67.36
17.50
63.20
3,257
715.93
63.30
18.00
59.54
3,137
715.91
59.64
18.50
55.93
3,019
715.89
56.03
19.00
52.38
2,902
715.86
52.48
19.50
48.74
2,772
715.84
48.85
20.00
45.05
2,637
715.81
45.16
20.50
41.53
2,509
715.78
41.62
21.00
39.55
2,436
715.77
39.59
21.50
38.53
2,398
715.76
38.56
22.00
37.77
2,368
715.76
37.79
22.50
37.04
2,339
715.75
37.07
23.00
36.32
2,309
715.74
36.35
23.50
35.61
2,279
715.74
35.63
24.00
34.89
2,250
715.73
34.91

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 59
Summary for Reach 5-2: 5-2
Inflow Area = 487.537 ac, 3.27% Impervious, Inflow Depth > 4.83" for 100 years - 24 hrs event
Inflow = 1,886.67 cfs @ 12.31 hrs, Volume= 196.040 of
Outflow = 1,862.41 cfs @ 12.38 hrs, Volume= 195.375 af, Atten= 1 %, Lag= 4.2 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 8.38 fps, Min. Travel Time= 2.5 min
Avg. Velocity = 2.52 fps, Avg. Travel Time= 8.3 min
Peak Storage= 278,549 cf @ 12.33 hrs
Average Depth at Peak Storage= 4.23'
Bank -Full Depth= 10.00' Flow Area= 818.9 sf, Capacity= 9,010.35 cfs
Custom cross-section
Constant n= 0.045
Inlet Invert= 715.26',
Length= 1,250.0' Slope= 0.0129 7'
Outlet Invert= 699.09'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
0.00
10.00
0.00
43.33
6.10
3.90
61.63
0.00
10.00
101.63
0.00
10.00
119.93
6.10
3.90
160.98
10.00
0.00
Depth End Area Perim.
Storage
Discharge
(feet)
(sq-ft) (feet)
(cubic -feet)
(cfs)
0.00
0.0 40.0
0
0.00
6.10
355.6 78.6
444,538
3,654.51
10.00
818.9 163.3
1,023,639
9,010.35

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 60
2,000
1,800
1,600
1,400
1,200
0 1,000
FL 800
600
400
200
0
Reach 5-2: 5-2
Hydrograph
1,862.41 cfs
Inflavre4�7.537c
Avg-. Flpw-Dppth�4.2�
Ma Ve =8.3$ fps
n 104
L='�,25q•0'
s=q- o s --
Capaci y=9,b 1-0 cf�-
I -A
4 -4
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
Inflow
— Outflow

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 61
Hydrograph for Reach 5-2: 5-2
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
715.26
0.00
0.50
0.00
0
715.26
0.00
1.00
0.00
0
715.26
0.00
1.50
0.00
0
715.26
0.00
2.00
0.00
0
715.26
0.00
2.50
0.00
0
715.26
0.00
3.00
0.00
0
715.26
0.00
3.50
0.00
0
715.26
0.00
4.00
0.00
0
715.26
0.00
4.50
0.00
0
715.26
0.00
5.00
0.02
7
715.26
0.00
5.50
0.16
106
715.26
0.06
6.00
0.40
354
715.27
0.21
6.50
0.74
738
715.27
0.45
7.00
1.64
1,538
715.29
0.93
7.50
3.04
3,084
715.32
1.89
8.00
4.95
5,364
715.37
3.42
8.50
8.02
7,425
715.41
6.26
9.00
13.63
10,823
715.47
11.03
9.50
21.95
14,929
715.55
18.84
10.00
31.01
18,850
715.63
27.91
10.50
45.10
23,767
715.72
40.39
11.00
69.94
31,267
715.86
62.28
11.50
119.64
43,581
716.08
104.81
12.00
735.67
126,814
717.44
448.92
12.50
1,392.09
238,729
718.99
1,627.59
13.00
430.18
109,904
717.18
507.79
13.50
232.18
71,962
716.57
252.50
14.00
168.96
58,222
716.34
178.37
14.50
134.73
50,211
716.20
140.45
15.00
116.71
45,609
716.12
119.82
15.50
104.52
42,563
716.06
107.06
16.00
93.25
39,642
716.01
95.83
16.50
82.65
36,794
715.96
84.82
17.00
76.10
34,777
715.92
77.43
17.50
71.55
33,426
715.90
72.59
18.00
67.39
32,231
715.88
68.39
18.50
63.28
31,041
715.85
64.31
19.00
59.21
29,764
715.83
60.28
19.50
55.08
28,460
715.81
56.16
20.00
50.88
27,136
715.78
51.97
20.50
47.00
25,867
715.76
47.90
21.00
44.87
24,998
715.74
45.34
21.50
43.74
24,546
715.73
44.02
22.00
42.87
24,225
715.73
43.11
22.50
42.05
23,930
715.72
42.28
23.00
41.23
23,636
715.72
41.46
23.50
40.41
23,343
715.71
40.64
24.00
39.59
23,051
715.71
39.82

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 62
Summary for Reach 6-1: 6-1
Inflow Area = 19.830 ac, 0.00% Impervious, Inflow Depth > 4.86" for 100 years - 24 hrs event
Inflow = 133.12 cfs @ 12.04 hrs, Volume= 8.029 of
Outflow = 120.34 cfs @ 12.16 hrs, Volume= 7.981 af, Atten= 10%, Lag= 6.7 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 6.14 fps, Min. Travel Time= 4.1 min
Avg. Velocity = 1.81 fps, Avg. Travel Time= 13.9 min
Peak Storage= 29,980 cf @ 12.09 hrs
Average Depth at Peak Storage= 1.40'
Bank -Full Depth= 9.00' Flow Area= 466.2 sf, Capacity= 6,384.82 cfs
Custom cross-section, Length= 1,502.0' Slope= 0.0322 T (101 Elevation Intervals)
Constant n= 0.045
Inlet Invert= 747.38', Outlet Invert= 699.09'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
0.00
9.00
0.00
43.48
5.00
4.00
58.50
0.00
9.00
68.50
0.00
9.00
83.50
5.00
4.00
130.56
9.00
0.00
Depth End Area
Perim.
Storage
Discharge
(feet)
(sq-ft)
(feet)
(cubic -feet)
(cfs)
0.00
0.0
10.0
0
0.00
5.00
125.1
41.6
187,825
1,541.18
9.00
466.2
132.5
700,247
6,384.82

Existing Conditions Type 11 24-hr 100 years -
24 hrs Rainfall=7.94"
Prepared by AECOM
Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC
Page 63
Reach 6-1: 6-1
Hydrograph
140
133.12
J
Inflow
Inflow �rea�19.60 120.34 cfs
— Outflow
120
-
-
A4 Flow Dlepth=1.410'
100
a� Ve'=6.114 fps- --TF I F7
0
_
FL 60
S=0.0322 T- L-i I L-t 1
Capacity=6,1384.02 cfjs
40
- -
-
20
0
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 64
Hydrograph for Reach 6-1: 6-1
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
747.38
0.00
0.50
0.00
0
747.38
0.00
1.00
0.00
0
747.38
0.00
1.50
0.00
0
747.38
0.00
2.00
0.00
0
747.38
0.00
2.50
0.00
0
747.38
0.00
3.00
0.00
0
747.38
0.00
3.50
0.00
0
747.38
0.00
4.00
0.00
0
747.38
0.00
4.50
0.00
0
747.38
0.00
5.00
0.00
0
747.38
0.00
5.50
0.00
0
747.38
0.00
6.00
0.00
0
747.38
0.00
6.50
0.00
0
747.38
0.00
7.00
0.09
43
747.38
0.02
7.50
0.23
183
747.39
0.12
8.00
0.39
361
747.40
0.26
8.50
0.61
587
747.42
0.43
9.00
0.96
938
747.44
0.69
9.50
1.27
1,358
747.47
1.01
10.00
1.74
1,672
747.49
1.46
10.50
2.62
2,136
747.52
2.17
11.00
4.18
2,930
747.56
3.36
11.50
7.78
4,303
747.65
6.09
12.00
122.56
24,879
748.59
60.46
12.50
18.33
9,603
747.93
28.47
13.00
9.53
5,692
747.72
10.93
13.50
7.09
4,626
747.66
7.77
14.00
5.56
3,959
747.63
6.09
14.50
4.77
3,508
747.60
4.99
15.00
4.30
3,288
747.59
4.48
15.50
3.84
3,078
747.57
4.02
16.00
3.37
2,866
747.56
3.55
16.50
3.08
2,668
747.55
3.19
17.00
2.92
2,555
747.54
3.00
17.50
2.75
2,452
747.54
2.83
18.00
2.58
2,349
747.53
2.66
18.50
2.41
2,244
747.52
2.49
19.00
2.24
2,139
747.52
2.32
19.50
2.07
2,034
747.51
2.15
20.00
1.89
1,928
747.50
1.98
20.50
1.81
1,850
747.50
1.84
21.00
1.77
1,824
747.50
1.79
21.50
1.74
1,803
747.50
1.76
22.00
1.71
1,783
747.49
1.72
22.50
1.67
1,762
747.49
1.69
23.00
1.64
1,742
747.49
1.66
23.50
1.61
1,721
747.49
1.62
24.00
1.57
1,700
747.49
1.59

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 65
Summary for Reach 7-1: 7-1
Inflow Area = 160.980 ac, 14.15% Impervious, Inflow Depth > 4.87" for 100 years - 24 hrs event
Inflow = 660.36 cfs @ 12.31 hrs, Volume= 65.329 of
Outflow = 633.40 cfs @ 12.45 hrs, Volume= 64.931 af, Atten= 4%, Lag= 8.3 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 7.24 fps, Min. Travel Time= 4.7 min
Avg. Velocity = 2.32 fps, Avg. Travel Time= 14.5 min
Peak Storage= 178,311 cf @ 12.37 hrs
Average Depth at Peak Storage= 3.02'
Bank -Full Depth= 10.00' Flow Area= 630.9 sf, Capacity= 7,020.15 cfs
Custom cross-section
Constant n= 0.045
Inlet Invert= 732.33',
Length= 2,028.0' Slope= 0.0164 '/'
Outlet Invert= 699.09'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
0.00
10.00
0.00
45.98
6.00
4.00
63.98
0.00
10.00
83.98
0.00
10.00
101.98
6.00
4.00
145.46
10.00
0.00
Depth End Area Perim.
Storage
Discharge
(feet)
(sq-ft) (feet)
(cubic -feet)
(cfs)
0.00
0.0 20.0
0
0.00
6.00
228.0 57.9
462,384
2,402.36
10.00
630.9 147.8
1,279,506
7,020.15

Existing Conditions Type 11 24-hr 100 years -
24 hrs Rainfall=7.94"
Prepared by AECOM
Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC
Page 66
Reach 7-1: 7-1
Hydrograph
700
-L-
633.40 cfs
Inflow
Inflow 1►rea�l601.980lac
— Outflow
600
_
-
Av§. Flow Depth=3.012'
500
Max Ve'=T--�4-fp�- 7
400
L-2,028.0'
300
S=0.0464-'/' L -1 _
,°
Capacity=7,1020.15 cfjs
200
-
1
0
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 67
Hydrograph for Reach 7-1: 7-1
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
732.33
0.00
0.50
0.00
0
732.33
0.00
1.00
0.00
0
732.33
0.00
1.50
0.00
0
732.33
0.00
2.00
0.00
0
732.33
0.00
2.50
0.00
0
732.33
0.00
3.00
0.00
0
732.33
0.00
3.50
0.00
0
732.33
0.00
4.00
0.00
0
732.33
0.00
4.50
0.00
0
732.33
0.00
5.00
0.00
0
732.33
0.00
5.50
0.08
29
732.33
0.01
6.00
0.55
418
732.34
0.14
6.50
1.18
1,301
732.36
0.51
7.00
1.86
2,517
732.39
1.03
7.50
2.60
3,948
732.43
1.65
8.00
3.37
5,172
732.45
2.68
8.50
4.33
6,130
732.48
3.58
9.00
6.22
7,624
732.51
4.87
9.50
8.83
9,745
732.56
7.22
10.00
11.62
11,846
732.61
9.94
10.50
16.64
14,699
732.67
13.85
11.00
25.29
19,138
732.77
20.79
11.50
42.04
26,274
732.92
33.62
12.00
209.59
62,876
733.63
92.24
12.50
490.02
161,318
735.13
619.04
13.00
143.65
71,720
733.78
200.02
13.50
75.68
44,777
733.29
90.59
14.00
54.21
35,244
733.11
60.56
14.50
43.15
30,126
733.00
46.87
15.00
37.76
27,297
732.95
39.63
15.50
33.90
25,474
732.91
35.50
16.00
30.12
23,660
732.87
31.71
16.50
26.60
21,899
732.83
27.97
17.00
24.69
20,703
732.81
25.48
17.50
23.29
19,895
732.79
23.92
18.00
21.92
19,156
732.77
22.54
18.50
20.55
18,422
732.76
21.18
19.00
19.18
17,682
732.74
19.80
19.50
17.81
16,927
732.72
18.45
20.00
16.43
16,086
732.71
17.12
20.50
15.16
15,247
732.69
15.76
21.00
14.60
14,751
732.68
14.86
21.50
14.30
14,522
732.67
14.45
22.00
14.03
14,346
732.67
14.17
22.50
13.76
14,178
732.66
13.90
23.00
13.49
14,009
732.66
13.63
23.50
13.22
13,839
732.66
13.36
24.00
12.94
13,669
732.65
13.08

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 68
Summary for Reach 8-1: 8-1
Inflow Area = 75.660 ac, 3.03% Impervious, Inflow Depth > 4.16" for 100 years - 24 hrs event
Inflow = 317.22 cfs @ 12.17 hrs, Volume= 26.227 of
Outflow = 294.81 cfs @ 12.32 hrs, Volume= 26.043 af, Atten= 7%, Lag= 9.2 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 6.26 fps, Min. Travel Time= 5.2 min
Avg. Velocity = 2.23 fps, Avg. Travel Time= 14.6 min
Peak Storage= 92,701 cf @ 12.24 hrs
Average Depth at Peak Storage= 2.64'
Bank -Full Depth= 9.00' Flow Area= 469.0 sf, Capacity= 4,160.07 cfs
Custom cross-section, Length= 1,957.0' Slope= 0.0101 T (101 Elevation Intervals)
Constant n= 0.035
Inlet Invert= 752.15', Outlet Invert= 732.33'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
0.00
9.00
0.00
75.00
6.00
3.00
93.00
0.00
9.00
103.00
0.00
9.00
121.00
6.00
3.00
154.70
9.00
0.00
Depth End Area
Perim.
Storage
Discharge
(feet)
(sq-ft)
(feet)
(cubic -feet)
(cfs)
0.00
0.0
10.0
0
0.00
6.00
168.0
47.9
328,776
1,655.95
9.00
469.0
156.8
917,931
4,160.07

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 69
Reach 8-1: 8-1
Hydrograph
350
300
250
200
3
150
U-
100
50
0L
0
294.81 cfs
Inflow Area�75.660 ac
Avg. Flow depth=2.64'
5Max Vel=6.�6 fps
n=0.035
L=1,957.0'
S=0.0101 T
Capacity=4,160.07 cfs
L 1+ 0 O I U I L I ,+ 1 0 10 L U
Time (hours)
— Inflow
— Outflow

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 70
Hydrograph for Reach 8-1: 8-1
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
752.15
0.00
0.50
0.00
0
752.15
0.00
1.00
0.00
0
752.15
0.00
1.50
0.00
0
752.15
0.00
2.00
0.00
0
752.15
0.00
2.50
0.00
0
752.15
0.00
3.00
0.00
0
752.15
0.00
3.50
0.00
0
752.15
0.00
4.00
0.00
0
752.15
0.00
4.50
0.00
0
752.15
0.00
5.00
0.00
0
752.15
0.00
5.50
0.00
0
752.15
0.00
6.00
0.00
0
752.15
0.00
6.50
0.00
0
752.15
0.00
7.00
0.00
0
752.15
0.00
7.50
0.00
0
752.15
0.00
8.00
0.00
0
752.15
0.00
8.50
0.25
109
752.16
0.02
9.00
0.99
844
752.19
0.28
9.50
1.96
2,265
752.26
0.96
10.00
3.09
3,535
752.32
2.12
10.50
5.19
5,083
752.39
3.79
11.00
8.94
7,345
752.49
6.68
11.50
17.14
11,190
752.65
12.37
12.00
181.54
46,836
753.76
61.49
12.50
122.02
59,012
754.06
209.22
13.00
41.38
25,844
753.16
56.57
13.50
27.29
18,319
752.91
31.29
14.00
21.19
15,295
752.80
23.51
14.50
17.47
13,284
752.73
18.80
15.00
15.73
12,290
752.69
16.47
15.50
14.12
11,457
752.66
14.87
16.00
12.48
10,602
752.62
13.24
16.50
11.17
9,822
752.59
11.69
17.00
10.54
9,377
752.57
10.85
17.50
9.96
9,029
752.56
10.25
18.00
9.37
8,686
752.55
9.66
18.50
8.78
8,341
752.53
9.07
19.00
8.18
7,991
752.52
8.48
19.50
7.57
7,628
752.50
7.89
20.00
6.96
7,225
752.49
7.30
20.50
6.51
6,862
752.47
6.72
21.00
6.37
6,711
752.46
6.45
21.50
6.26
6,626
752.46
6.32
22.00
6.14
6,549
752.46
6.20
22.50
6.03
6,471
752.45
6.09
23.00
5.91
6,392
752.45
5.97
23.50
5.79
6,314
752.45
5.86
24.00
5.67
6,234
752.44
5.74

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 71
Summary for Reach 17-1: 17-1
Inflow Area = 670.661 ac, 5.78% Impervious, Inflow Depth > 4.82" for 100 years - 24 hrs event
Inflow = 2,513.80 cfs @ 12.39 hrs, Volume= 269.360 of
Outflow = 2,509.44 cfs @ 12.40 hrs, Volume= 269.270 af, Atten= 0%, Lag= 0.4 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 24.12 fps, Min. Travel Time= 0.2 min
Avg. Velocity = 7.13 fps, Avg. Travel Time= 0.8 min
Peak Storage= 36,270 cf @ 12.40 hrs
Average Depth at Peak Storage= 5.21'
Bank -Full Depth= 6.50' Flow Area= 130.0 sf, Capacity= 3,441.46 cfs
20.00' x 6.50' deep channel, n= 0.013 Concrete, trowel finish
Length= 348.0' Slope= 0.0086 '/'
Inlet Invert= 694.00', Outlet Invert= 691.00'
2,500
2,000
N
1,500
3
0
U_
1,000
500
0
Reach 17-1: 17-1
Hydrograph
2,509.44 cfs
Inflow Area=670.661 ac
Avg. Flow Depth=5.21'
Max Vet=24.12 fps
n=0.013
L=348.0'
S=0.0086 '/'
Capacity=3,441.46 cfs
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Inflow
— Outflow

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 72
Hydrograph for Reach 17-1: 17-1
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
694.00
0.00
0.50
0.00
0
694.00
0.00
1.00
0.00
0
694.00
0.00
1.50
0.00
0
694.00
0.00
2.00
0.00
0
694.00
0.00
2.50
0.00
0
694.00
0.00
3.00
0.00
0
694.00
0.00
3.50
0.00
0
694.00
0.00
4.00
0.00
0
694.00
0.00
4.50
0.00
0
694.00
0.00
5.00
0.00
0
694.00
0.00
5.50
0.08
13
694.00
0.06
6.00
0.38
68
694.01
0.33
6.50
1.00
188
694.03
0.91
7.00
2.05
387
694.06
1.89
7.50
3.75
587
694.08
3.63
8.00
6.47
835
694.12
6.26
8.50
10.41
1,122
694.16
10.21
9.00
16.79
1,507
694.22
16.44
9.50
27.31
2,036
694.29
26.92
10.00
39.64
2,563
694.37
39.24
10.50
56.87
3,199
694.46
56.26
11.00
87.13
4,155
694.60
86.18
11.50
145.76
5,703
694.82
143.97
12.00
621.36
14,063
696.02
594.20
12.50
2,277.07
33,979
698.88
2,300.51
13.00
719.89
15,792
696.27
732.09
13.50
351.71
9,970
695.43
354.83
14.00
245.69
7,948
695.14
247.05
14.50
192.89
6,832
694.98
193.69
15.00
164.46
6,183
694.89
164.89
15.50
147.05
5,768
694.83
147.40
16.00
131.50
5,385
694.77
131.86
16.50
116.36
4,993
694.72
116.67
17.00
106.26
4,717
694.68
106.44
17.50
99.68
4,537
694.65
99.82
18.00
93.91
4,371
694.63
94.04
18.50
88.27
4,208
694.60
88.40
19.00
82.68
4,045
694.58
82.82
19.50
77.01
3,870
694.56
77.15
20.00
71.30
3,693
694.53
71.45
20.50
65.72
3,513
694.50
65.85
21.00
62.20
3,393
694.49
62.27
21.50
60.44
3,334
694.48
60.48
22.00
59.21
3,293
694.47
59.24
22.50
58.07
3,255
694.47
58.10
23.00
56.94
3,217
694.46
56.97
23.50
55.81
3,179
694.46
55.84
24.00
54.69
3,139
694.45
54.72

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 73
Summary for Reach 18-1: 18-1
Inflow Area = 670.661 ac, 5.78% Impervious, Inflow Depth > 4.82" for 100 years - 24 hrs event
Inflow = 2,509.44 cfs @ 12.40 hrs, Volume= 269.270 of
Outflow = 2,508.23 cfs @ 12.40 hrs, Volume= 269.243 af, Atten= 0%, Lag= 0.1 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 67.72 fps, Min. Travel Time= 0.1 min
Avg. Velocity = 19.29 fps, Avg. Travel Time= 0.2 min
Peak Storage= 10,153 cf @ 12.40 hrs
Average Depth at Peak Storage= 1.85'
Bank -Full Depth= 6.50' Flow Area= 130.0 sf, Capacity= 16,301.76 cfs
20.00' x 6.50' deep channel, n= 0.013 Concrete, trowel finish
Length= 274.0' Slope= 0.1934 '/'
Inlet Invert= 691.00', Outlet Invert= 638.00'
2,500
2,000
N
1,500
3
0
U_
1,000
500
0
Reach 18-1: 18-1
Hydrograph
2,508.23 cfs
Inflow Area=670.661 ac
Avg. Flow Depth=1.85'
Max Vet=67.72 fps
n=0.013
L=274.0'
S=0.1934 '/'
Capacity=16,301.76 cfs
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Inflow
— Outflow

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 74
Hydrograph for Reach 18-1: 18-1
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
691.00
0.00
0.50
0.00
0
691.00
0.00
1.00
0.00
0
691.00
0.00
1.50
0.00
0
691.00
0.00
2.00
0.00
0
691.00
0.00
2.50
0.00
0
691.00
0.00
3.00
0.00
0
691.00
0.00
3.50
0.00
0
691.00
0.00
4.00
0.00
0
691.00
0.00
4.50
0.00
0
691.00
0.00
5.00
0.00
0
691.00
0.00
5.50
0.06
2
691.00
0.06
6.00
0.33
11
691.00
0.32
6.50
0.91
31
691.01
0.90
7.00
1.89
63
691.01
1.86
7.50
3.63
122
691.02
3.59
8.00
6.26
210
691.04
6.19
8.50
10.21
343
691.06
10.12
9.00
16.44
448
691.08
16.34
9.50
26.92
612
691.11
26.80
10.00
39.24
779
691.14
39.14
10.50
56.26
968
691.18
56.07
11.00
86.18
1,256
691.23
85.88
11.50
143.97
1,723
691.31
143.43
12.00
594.20
4,094
691.75
586.76
12.50
2,300.51
9,613
692.75
2,306.64
13.00
732.09
4,687
691.86
735.62
13.50
354.83
2,996
691.55
355.75
14.00
247.05
2,400
691.44
247.44
14.50
193.69
2,068
691.38
193.93
15.00
164.89
1,874
691.34
165.01
15.50
147.40
1,752
691.32
147.50
16.00
131.86
1,633
691.30
131.95
16.50
116.67
1,517
691.28
116.75
17.00
106.44
1,438
691.26
106.49
17.50
99.82
1,381
691.25
99.86
18.00
94.04
1,329
691.24
94.09
18.50
88.40
1,279
691.23
88.44
19.00
82.82
1,228
691.22
82.86
19.50
77.15
1,177
691.21
77.19
20.00
71.45
1,126
691.21
71.49
20.50
65.85
1,076
691.20
65.89
21.00
62.27
1,037
691.19
62.29
21.50
60.48
1,017
691.19
60.49
22.00
59.24
1,003
691.18
59.25
22.50
58.10
990
691.18
58.11
23.00
56.97
978
691.18
56.98
23.50
55.84
965
691.18
55.85
24.00
54.72
953
691.17
54.73

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 75
Summary for Reach 23R: Stream Beginning
Inflow Area = 96.660 ac, 0.00% Impervious, Inflow Depth > 10.87" for 100 years - 24 hrs event
Inflow = 321.93 cfs @ 12.08 hrs, Volume= 87.527 af, Incl. 29.00 cfs Base Flow
Outflow = 315.25 cfs @ 12.20 hrs, Volume= 87.096 af, Atten= 2%, Lag= 7.2 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 7.92 fps, Min. Travel Time= 2.8 min
Avg. Velocity = 4.87 fps, Avg. Travel Time= 4.6 min
Peak Storage= 53,325 cf @ 12.15 hrs
Average Depth at Peak Storage= 2.26'
Bank -Full Depth= 94.66' Flow Area= 78,667.2 sf, Capacity= 6,461,392.31 cfs
Custom cross-section, Length= 1,338.8' Slope= 0.0303 T (112 Elevation Intervals)
Constant n= 0.040
Inlet Invert= 656.55', Outlet Invert= 615.97'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
74.42
700.66
0.00
168.56
695.66
5.00
283.63
671.68
28.98
442.63
620.00
80.66
514.29
610.00
90.66
733.65
611.99
88.67
754.40
606.24
94.42
764.63
606.00
94.66
771.19
608.00
92.66
843.45
612.00
88.66
1,316.83
682.00
18.66
1,444.58
690.00
10.66
1,552.47
688.51
12.15
1,647.76
678.00
22.66
1,658.48
678.00
22.66
1,792.16
700.66
0.00

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 76
Depth
End Area
Perim.
Storage Discharge
(feet)
(sq-ft)
(feet)
(cubic -feet) (cfs)
0.00
0.0
0.0
0 0.00
0.24
1.3
11.1
1,770 2.08
2.00
31.4
23.7
42,014 244.87
4.00
121.0
67.4
162,010 1,156.69
5.99
528.7
344.6
707,812 4,548.84
6.00
532.1
344.8
712,409 4,595.93
14.00
3,725.8
457.4
4,988,068 97,555.18
65.68
40,375.4
977.9
54,054,6443,119,567.13
72.00
46,695.1
1,062.8
62,515,3823,760,494.23
76.00
51,096.1
1,170.2
68,407,4474,098,013.65
82.51
59,361.3
1,404.6
79,472,90F4,658,383.64
84.00
61,536.3
1,552.5
82,384,8164,626,837.94
89.66
70,387.6
1,614.1
94,234,8915,640,154.10
94.66
78,667.2
1,738.3
105,319,63C6,461,392.31
350
300
250
N
200
3
F 150
100
50
0
Reach 23R: Stream Beginning
Hydrograph
315.25 cfs
Inflow Area=96.660 ac
Avg. Flow Depth=2.26'
Max Vet=7.92 fps
n=0.040
=1,338.8'
S=0.0303 T
Capacity=6,461,392.31 cfs
0 2 4 6 8 10 12 14 16 18 20 22
Time (hours)
24
- Inflow
- Outflow

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 77
Hydrograph for Reach 23R: Stream Beginning
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
29.00
0
656.55
0.00
0.50
29.00
8,403
657.16
28.96
1.00
29.00
8,407
657.16
29.00
1.50
29.00
8,407
657.16
29.00
2.00
29.00
8,407
657.16
29.00
2.50
29.00
8,407
657.16
29.00
3.00
29.00
8,407
657.16
29.00
3.50
29.00
8,407
657.16
29.00
4.00
29.00
8,407
657.16
29.00
4.50
29.00
8,407
657.16
29.00
5.00
29.00
8,407
657.16
29.00
5.50
29.00
8,407
657.16
29.00
6.00
29.00
8,407
657.16
29.00
6.50
29.00
8,407
657.16
29.00
7.00
29.00
8,407
657.16
29.00
7.50
29.00
8,407
657.16
29.00
8.00
29.00
8,407
657.16
29.00
8.50
29.00
8,407
657.16
29.00
9.00
29.03
8,410
657.16
29.00
9.50
29.71
8,552
657.17
29.50
10.00
30.93
8,835
657.18
30.60
10.50
33.06
9,322
657.21
32.47
11.00
37.00
10,213
657.26
35.88
11.50
46.04
12,190
657.37
43.22
12.00
286.59
41,296
658.53
183.62
12.50
171.73
34,658
658.28
213.49
13.00
80.25
18,859
657.67
87.34
13.50
61.62
15,796
657.55
63.68
14.00
54.21
14,645
657.50
55.30
14.50
49.93
13,668
657.45
50.64
15.00
47.80
13,107
657.42
48.25
15.50
45.88
12,633
657.39
46.32
16.00
43.93
12,155
657.37
44.38
16.50
42.44
11,757
657.34
42.69
17.00
41.66
11,554
657.33
41.83
17.50
40.97
11,382
657.32
41.13
18.00
40.27
11,210
657.31
40.43
18.50
39.56
11,036
657.30
39.73
19.00
38.85
10,859
657.29
39.01
19.50
38.12
10,681
657.28
38.29
20.00
37.39
10,501
657.27
37.56
20.50
36.88
10,361
657.27
36.96
21.00
36.70
10,311
657.26
36.74
21.50
36.56
10,277
657.26
36.60
22.00
36.43
10,243
657.26
36.46
22.50
36.29
10,209
657.26
36.32
23.00
36.15
10,175
657.26
36.18
23.50
36.01
10,141
657.25
36.05
24.00
35.87
10,106
657.25
35.90

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 78
Summary for Reach 24R: Road Culvert
Inflow Area = 162.610 ac, 0.00% Impervious, Inflow Depth > 7.93" for 100 years - 24 hrs event
Inflow = 527.74 cfs @ 12.17 hrs, Volume= 107.476 of
Outflow = 427.05 cfs @ 12.50 hrs, Volume= 106.116 af, Atten= 19%, Lag= 19.7 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 5.74 fps, Min. Travel Time= 7.3 min
Avg. Velocity = 2.53 fps, Avg. Travel Time= 16.6 min
Peak Storage= 239,275 cf @ 12.37 hrs
Average Depth at Peak Storage= 2.39'
Bank -Full Depth= 39.37' Flow Area= 11,690.1 sf, Capacity= 402,588.09 cfs
Custom cross-section, Length= 2,511.7' Slope= 0.0111 T (109 Elevation Intervals)
Constant n= 0.040
Inlet Invert= 615.97', Outlet Invert= 588.00'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
16.74
629.37
0.00
46.74
623.76
5.61
73.81
616.00
13.37
87.73
610.00
19.37
95.22
604.48
24.89
103.27
590.00
39.37
137.81
590.00
39.37
140.51
592.00
37.37
332.24
594.00
35.37
348.56
596.04
33.33
362.15
598.63
30.74
410.71
616.00
13.37
420.31
622.00
7.37
445.73
629.37
0.00

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 79
Depth
End Area
Perim.
Storage
Discharge
(feet)
(sq-ft)
(feet)
(cubic -feet)
(cfs)
0.00
0.0
34.5
0
0.00
2.00
72.9
40.2
183,083
425.00
4.00
342.4
234.2
860,100
1,729.33
6.04
831.9
253.0
2,089,423
7,211.20
8.63
1,495.3
269.8
3,755,840
18,359.59
14.48
3,095.2
293.9
7,774,219
58,305.65
20.00
4,722.2
319.6
11,860,740
111,480.77
26.00
6,651.5
352.5
16,706,610
184,811.49
32.00
8,764.5
385.6
22,013,810
275,694.39
33.76
9,421.9
398.3
23,665,058
304,365.07
39.37
11,690.1
449.0
29,362,117
402,588.09
550
500
450
HIN
350
3 300
�° 250
200
150
100
50
0
Reach 24R: Road Culvert
Hydrograph
527
Infl6w-Area=l1�r2.�" at
Avq. Few-Bopth�.39 42
Max Vet=5.7� fps
n 4.04QI
L ,511 �7' L -
S=+.0111 11, I
Capacity=402,588.09 cfs
T 7 T- -T
L -L
�- 4
T- 7
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
Inflow
- Outflow

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 80
Hydrograph for Reach 24R: Road Culvert
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
615.97
0.00
0.50
28.96
23,227
616.23
14.94
1.00
29.00
32,404
616.34
25.82
1.50
29.00
34,473
616.36
28.28
2.00
29.00
34,771
616.37
28.95
2.50
29.00
34,784
616.37
29.00
3.00
29.00
34,784
616.37
29.00
3.50
29.00
34,784
616.37
29.00
4.00
29.00
34,784
616.37
29.00
4.50
29.00
34,784
616.37
29.00
5.00
29.00
34,784
616.37
29.00
5.50
29.00
34,784
616.37
29.00
6.00
29.00
34,784
616.37
29.00
6.50
29.00
34,784
616.37
29.00
7.00
29.00
34,784
616.37
29.00
7.50
29.00
34,784
616.37
29.00
8.00
29.00
34,784
616.37
29.00
8.50
29.00
34,784
616.37
29.00
9.00
29.01
34,785
616.37
29.00
9.50
29.95
35,107
616.37
29.31
10.00
31.86
36,036
616.38
30.72
10.50
35.13
37,622
616.40
33.15
11.00
41.13
40,472
616.43
37.45
11.50
54.30
46,349
616.50
45.86
12.00
328.91
112,823
617.23
98.39
12.50
317.07
216,745
618.21
427.03
13.00
123.80
93,390
617.02
177.48
13.50
86.54
70,743
616.77
100.17
14.00
72.75
61,919
616.67
79.70
14.50
65.03
56,553
616.61
68.98
15.00
61.15
53,783
616.58
63.25
15.50
57.91
51,860
616.56
59.73
16.00
54.65
50,004
616.54
56.48
16.50
51.90
48,276
616.52
53.29
17.00
50.50
47,285
616.51
51.26
17.50
49.33
46,587
616.50
49.98
18.00
48.15
45,919
616.49
48.81
18.50
46.96
45,244
616.48
47.63
19.00
45.76
44,560
616.48
46.44
19.50
44.55
43,869
616.47
45.23
20.00
43.32
43,171
616.46
44.01
20.50
42.34
42,540
616.45
42.82
21.00
42.00
42,252
616.45
42.18
21.50
41.76
42,104
616.45
41.89
22.00
41.53
41,973
616.45
41.66
22.50
41.30
41,842
616.45
41.43
23.00
41.07
41,709
616.44
41.20
23.50
40.84
41,576
616.44
40.97
24.00
40.60
41,442
616.44
40.73

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 81
Summary for Reach 25R: RR Culvert
Inflow Area = 170.800 ac, 0.00% Impervious, Inflow Depth > 7.63" for 100 years - 24 hrs event
Inflow = 436.98 cfs @ 12.32 hrs, Volume= 108.656 of
Outflow = 432.92 cfs @ 12.50 hrs, Volume= 108.572 af, Atten= 1 %, Lag= 10.8 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 8.37 fps, Min. Travel Time= 0.5 min
Avg. Velocity = 4.14 fps, Avg. Travel Time= 1.0 min
Peak Storage= 12,672 cf @ 12.32 hrs
Average Depth at Peak Storage= 3.43'
Bank -Full Depth= 27.36' Flow Area= 3,723.4 sf, Capacity= 91,794.33 cfs
Custom cross-section, Length= 242.5' Slope= 0.0165 T (104 Elevation Intervals)
Constant n= 0.040
Inlet Invert= 584.00', Outlet Invert= 580.00'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
34.01
607.36
0.00
66.97
600.00
7.36
118.99
600.00
7.36
176.43
590.00
17.36
213.63
588.00
19.36
228.46
580.00
27.36
238.68
580.00
27.36
244.95
585.91
21.45
342.59
607.36
0.00
Depth End
Area Perim.
Storage
Discharge
(feet)
(sq-ft) (feet)
(cubic -feet)
(cfs)
0.00
0.0 10.2
0
0.00
5.91
111.3 31.3
26,991
1,237.62
8.00
182.7 45.4
44,294
2,203.63
10.00
310.6 92.0
75,327
3,335.52
20.00 1,696.8
248.9
411,474
29,104.81
27.36 3,723.4
317.0
902,916
91,794.33

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 82
Reach 25R: RR Culvert
Hydrograph
450
400
350
N 300
3 250
,° 200
150
100
50
0
432.92 cfs
Inflow �rea=l701-800 ac
Avg. Flow Depth=3.413'
Mai Ve'=&. 7 fps
n-Q.04Q
L=t42�' I L 1
Capacigy-91,794.33 cfs
L
—L 1
1
-4 1
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
Inflow
— Outflow

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 83
Hydrograph for Reach 25R: RR Culvert
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
584.00
0.00
0.50
14.94
1,230
584.46
13.84
1.00
25.82
1,815
584.67
25.61
1.50
28.28
1,932
584.71
28.24
2.00
28.95
1,964
584.72
28.94
2.50
29.00
1,966
584.72
29.00
3.00
29.00
1,966
584.72
29.00
3.50
29.00
1,966
584.72
29.00
4.00
29.00
1,966
584.72
29.00
4.50
29.00
1,966
584.72
29.00
5.00
29.00
1,966
584.72
29.00
5.50
29.00
1,966
584.72
29.00
6.00
29.00
1,966
584.72
29.00
6.50
29.00
1,966
584.72
29.00
7.00
29.00
1,966
584.72
29.00
7.50
29.00
1,966
584.72
29.00
8.00
29.00
1,966
584.72
29.00
8.50
29.00
1,966
584.72
29.00
9.00
29.00
1,966
584.72
29.00
9.50
29.40
1,983
584.72
29.36
10.00
30.93
2,052
584.75
30.85
10.50
33.57
2,172
584.79
33.43
11.00
38.27
2,367
584.85
38.04
11.50
47.65
2,721
584.96
47.15
12.00
136.98
5,440
585.75
127.40
12.50
433.34
12,571
587.41
432.92
13.00
180.82
6,837
586.12
186.23
13.50
102.67
4,603
585.52
103.93
14.00
81.68
3,938
585.33
82.18
14.50
70.68
3,563
585.22
70.97
15.00
64.79
3,362
585.16
64.94
15.50
61.11
3,237
585.12
61.23
16.00
57.69
3,120
585.09
57.82
16.50
54.40
2,993
585.05
54.51
17.00
52.31
2,912
585.02
52.37
17.50
50.98
2,861
585.01
51.03
18.00
49.75
2,813
584.99
49.79
18.50
48.51
2,766
584.98
48.55
19.00
47.25
2,717
584.96
47.30
19.50
45.98
2,669
584.95
46.03
20.00
44.70
2,619
584.93
44.75
20.50
43.48
2,573
584.92
43.52
21.00
42.83
2,547
584.91
42.84
21.50
42.53
2,536
584.90
42.54
22.00
42.29
2,526
584.90
42.30
22.50
42.05
2,517
584.90
42.05
23.00
41.80
2,508
584.90
41.81
23.50
41.56
2,498
584.89
41.57
24.00
41.31
2,489
584.89
41.32

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 84
Summary for Reach 26R: To Dan River
Inflow Area = 175.798 ac, 0.00% Impervious, Inflow Depth > 7.52" for 100 years - 24 hrs event
Inflow = 439.99 cfs @ 12.33 hrs, Volume= 110.121 of
Outflow = 440.91 cfs @ 12.37 hrs, Volume= 109.999 af, Atten= 0%, Lag= 2.1 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 5.78 fps, Min. Travel Time= 0.7 min
Avg. Velocity = 3.19 fps, Avg. Travel Time= 1.3 min
Peak Storage= 19,724 cf @ 12.35 hrs
Average Depth at Peak Storage= 2.54'
Bank -Full Depth= 10.54' Flow Area= 1,563.4 sf, Capacity= 19,048.17 cfs
Custom cross-section, Length= 258.3' Slope= 0.0157 T (103 Elevation Intervals)
Constant n= 0.040
Inlet Invert= 583.01', Outlet Invert= 578.96'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
43.40
593.14
0.00
226.12
588.00
5.14
252.69
586.00
7.14
285.16
582.83
10.31
293.21
582.60
10.54
342.47
588.00
5.14
411.43
593.14
0.00
Depth End Area Perim.
Storage
Discharge
(feet)
(sq-ft) (feet)
(cubic -feet)
(cfs)
0.00
0.0 0.0
0
0.00
0.23
1.2 10.2
301
1.28
3.40
130.6 71.9
33,743
905.02
5.40
318.5 116.9
82,274
2,890.90
10.54 1,563.4
368.8
403,820
19,048.17

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 85
450
400
350
300
3 250
,° 200
150
100
50
0
Reach 26R: To Dan River
Hydrograph
440.91 Cfs
Inflow 1►rea�1751.7981ac
Avg. F16wDepth=2.54' 1
Mai Ve'=5.78 fps 1 1 1 1 1 1 1
S=6.01$7-I' L A 1 L-1 1
Capacity=1 048�.17�fs I — I
- 1 4 1 —'
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
Inflow
— Outflow

Existing Conditions Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 86
Hydrograph for Reach 26R: To Dan River
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
583.01
0.00
0.50
13.84
1,454
583.57
12.13
1.00
25.61
2,390
583.77
25.27
1.50
28.24
2,576
583.80
28.16
2.00
28.94
2,626
583.81
28.93
2.50
29.00
2,630
583.81
29.00
3.00
29.00
2,630
583.81
29.00
3.50
29.00
2,630
583.81
29.00
4.00
29.00
2,630
583.81
29.00
4.50
29.00
2,630
583.81
29.00
5.00
29.00
2,630
583.81
29.00
5.50
29.00
2,630
583.81
29.00
6.00
29.00
2,630
583.81
29.00
6.50
29.00
2,630
583.81
29.00
7.00
29.00
2,630
583.81
29.00
7.50
29.00
2,630
583.81
29.00
8.00
29.00
2,630
583.81
29.00
8.50
29.00
2,630
583.81
29.00
9.00
29.00
2,630
583.81
29.00
9.50
29.41
2,655
583.82
29.35
10.00
30.96
2,756
583.84
30.84
10.50
33.67
2,928
583.87
33.47
11.00
38.52
3,222
583.92
38.15
11.50
48.19
3,787
584.01
47.41
12.00
147.46
8,349
584.58
131.81
12.50
437.35
19,584
585.54
436.62
13.00
188.33
10,628
584.81
197.60
13.50
105.48
6,847
584.42
107.54
14.00
83.40
5,738
584.28
84.19
14.50
72.01
5,140
584.20
72.48
15.00
65.88
4,811
584.16
66.13
15.50
62.08
4,601
584.13
62.28
16.00
58.57
4,408
584.10
58.76
16.50
55.20
4,222
584.07
55.36
17.00
53.02
4,097
584.05
53.11
17.50
51.64
4,016
584.04
51.71
18.00
50.37
3,942
584.03
50.44
18.50
49.09
3,868
584.02
49.16
19.00
47.80
3,793
584.01
47.87
19.50
46.49
3,717
584.00
46.57
20.00
45.17
3,640
583.98
45.25
20.50
43.92
3,567
583.97
43.99
21.00
43.24
3,526
583.97
43.26
21.50
42.93
3,508
583.96
42.95
22.00
42.68
3,493
583.96
42.69
22.50
42.43
3,479
583.96
42.44
23.00
42.18
3,464
583.96
42.19
23.50
41.93
3,448
583.95
41.94
24.00
41.67
3,432
583.95
41.69

ATTACHMENT A-3
HydroCAD Calculations for Basin Design:
Post Development 100yr storm
Belews Creek Basin Design Memo

/D 30R
14 To Dan ever
DA 14 15
DA 15
(12 D 29R 13
DA 12 RR Cu v rt DA 13
D� 28R a (�,
O Road ulvert DA 11
DA 10
DA 6 Spillwr utfall DA 9
O -V A5P
DA 6 Retentiln Basin
(5)
1P
(new Subcat) (new Subcat)
16S
18P 15R (new Subcat)
NE Drainage (new Reach)
17
DA5 Detente n Basin \ NE dfill Corner
O
DA7 11 R
(new each)
O 6R (�) 7S
DA3 DA4 O
new Reach)
(new Subcat)
4R 5R Q\
/}� c2) / (new Reach) (new Reach)
cl) DA2
DA1
Subcat Reach on Link

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 1: DA1
Runoff = 291.27 cfs @ 12.56 hrs, Volume= 42.101 af, Depth> 3.68"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
82.455 70 Woods, Good, HSG C
54.970 55 Woods, Good, HSG B
137.425 64 Weighted Average
137.425 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
17.8
100
0.0305
0.09
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
1.2
47
0.0183
0.68
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
0.6
78
0.2040
2.26
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
24.4
1,266
0.0298
0.86
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
9.7
663
0.0523
1.14
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
0.1
1,392
0.0852
198.75887,689.19
Channel Flow,
Area= 4,466.3 sf Perim= 307.2' r= 14.54' n= 0.013
53.8 3,546 Total

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 3
Subcatchment 1: DA1
Hydrograph
300
250
N 200
0 150
U_
100
50-
04
0
291.27 cfs
Type II 24-1ir I i
100 years -,24 hrs Rainf 11=7.94"
Runoff Area=137.425 a 7
Runoff Volume=42.101 of
Run-off Depth>3.68—
Flo* Length=3,546'
Tc=53.8 min
CN44
I
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 4
Hydrograph for Subcatchment 1: DA1
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.03
9.50
1.29
0.00
0.22
9.75
1.36
0.01
0.63
10.00
1.44
0.02
1.24
10.25
1.52
0.03
2.04
10.50
1.62
0.04
3.10
10.75
1.73
0.06
4.51
11.00
1.87
0.09
6.42
11.25
2.03
0.13
9.05
11.50
2.25
0.19
12.89
11.75
3.07
0.50
20.01
12.00
5.26
1.75
55.10
12.25
5.61
1.99
181.62
12.50
5.84
2.15
288.72
12.75
6.00
2.26
258.55
13.00
6.13
2.36
174.73
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
120.05
13.50
6.34
2.51
86.47
13.75
6.43
2.58
65.99
14.00
6.51
2.63
53.07
14.25
6.58
2.69
44.31
14.50
6.65
2.74
38.15
14.75
6.72
2.79
33.63
15.00
6.78
2.83
30.49
15.25
6.83
2.88
28.49
15.50
6.89
2.92
26.84
15.75
6.94
2.96
25.34
16.00
6.99
2.99
23.90
16.25
7.03
3.03
22.49
16.50
7.08
3.06
21.17
16.75
7.12
3.09
20.08
17.00
7.16
3.12
19.26
17.25
7.20
3.15
18.61
17.50
7.24
3.18
18.04
17.75
7.28
3.21
17.51
18.00
7.31
3.24
16.99
18.25
7.35
3.27
16.49
18.50
7.38
3.29
15.98
18.75
7.41
3.32
15.47
19.00
7.45
3.34
14.96
19.25
7.48
3.37
14.45
19.50
7.50
3.39
13.94
19.75
7.53
3.41
13.43
20.00
7.56
3.43
12.92
20.25
7.58
3.45
12.41
20.50
7.61
3.47
11.93
20.75
7.64
3.49
11.55
21.00
7.66
3.51
11.29
21.25
7.68
3.53
11.11
21.50
7.71
3.55
10.97
21.75
7.73
3.57
10.85
22.00
7.76
3.59
10.75
22.25
7.78
3.61
10.65
22.50
7.80
3.63
10.55
22.75
7.83
3.64
10.46
23.00
7.85
3.66
10.36
23.25
7.87
3.68
10.26
23.50
7.90
3.70
10.16
23.75
7.92
3.72
10.06
24.00
7.94
3.73
9.96

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 5
Summary for Subcatchment 2: DA2
Runoff = 422.40 cfs @ 12.53 hrs, Volume= 58.976 af, Depth> 4.92"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
58.998
70
Woods, Good, HSG C
39.332
55
Woods, Good, HSG B
45.387
98
Water Surface
143.717
75
Weighted Average
98.330
68.42% Pervious Area
45.387
31.58% Impervious Area
Tc
Length
Slope
Velocity Capacity
Description
(min)
(feet)
(ft/ft)
(ft/sec) (cfs)
21.2
100
0.0197
0.08
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
20.4
1,198
0.0384
0.98
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
9.8
699
0.0568
1.19
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
1.1
1,577
0.0220
22.93 16,334.95
Channel Flow,
Area= 712.3 sf Perim= 102.5' r= 6.95' n= 0.035
52.5 3,574 Total
450
400
350
MIN
250
3
2 200
150
100
50
Subcatchment 2: DA2
Hydrograph
- 422.40 cfs
Type)--Il 2"r — I—
-�--
---4
100 years -124 hra Rainfall=7.94"
Runoff �a=443.7'17
at.
Runoff Volume=58.976
Runoff Depth>4.9'2"
of
Flov_Lenoh _3 574'
Tc=52.5 min
CN45
4
4
- +
- +
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 6
Hydrograph for Subcatchment 2: DA2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.06
7.00
0.79
0.00
0.25
7.25
0.83
0.01
0.58
7.50
0.87
0.01
1.01
7.75
0.91
0.02
1.49
8.00
0.95
0.02
2.01
8.25
1.00
0.03
2.56
8.50
1.05
0.04
3.17
8.75
1.11
0.05
3.92
9.00
1.17
0.07
4.86
9.25
1.23
0.08
5.99
9.50
1.29
0.10
7.24
9.75
1.36
0.12
8.44
10.00
1.44
0.14
9.62
10.25
1.52
0.17
11.12
10.50
1.62
0.21
13.16
10.75
1.73
0.26
15.89
11.00
1.87
0.32
19.47
11.25
2.03
0.40
24.26
11.50
2.25
0.51
31.04
11.75
3.07
1.01
43.36
12.00
5.26
2.67
102.10
12.25
5.61
2.95
289.37
12.50
5.84
3.14
421.04
12.75
6.00
3.28
355.54
13.00
6.13
3.39
230.80
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
3.49
154.70
13.50
6.34
3.58
109.40
13.75
6.43
3.65
82.30
14.00
6.51
3.72
65.52
14.25
6.58
3.78
54.35
14.50
6.65
3.84
46.56
14.75
6.72
3.90
40.80
15.00
6.78
3.95
37.11
15.25
6.83
4.00
34.66
15.50
6.89
4.05
32.60
15.75
6.94
4.10
30.74
16.00
6.99
4.14
28.96
16.25
7.03
4.18
27.22
16.50
7.08
4.22
25.59
16.75
7.12
4.25
24.26
17.00
7.16
4.29
23.24
17.25
7.20
4.33
22.42
17.50
7.24
4.36
21.71
17.75
7.28
4.39
21.06
18.00
7.31
4.43
20.43
18.25
7.35
4.46
19.81
18.50
7.38
4.49
19.18
18.75
7.41
4.52
18.55
19.00
7.45
4.54
17.92
19.25
7.48
4.57
17.30
19.50
7.50
4.60
16.67
19.75
7.53
4.62
16.05
20.00
7.56
4.65
15.43
20.25
7.58
4.67
14.80
20.50
7.61
4.69
14.21
20.75
7.64
4.71
13.75
21.00
7.66
4.74
13.45
21.25
7.68
4.76
13.24
21.50
7.71
4.78
13.08
21.75
7.73
4.80
12.94
22.00
7.76
4.82
12.81
22.25
7.78
4.84
12.67
22.50
7.80
4.87
12.54
22.75
7.83
4.89
12.42
23.00
7.85
4.91
12.30
23.25
7.87
4.93
12.18
23.50
7.90
4.95
12.06
23.75
7.92
4.97
11.94
24.00
7.94
4.99
11.81

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 7
Summary for Subcatchment 3: DA3
Runoff = 143.46 cfs @ 12.44 hrs, Volume= 18.316 af, Depth> 3.69"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
35.779
70
Woods, Good, HSG C
23.853
55
Woods, Good, HSG B
59.632
64
Weighted Average
59.632
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
24.9 100
0.0132
0.07
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
20.4 1,484
0.0587
1.21
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
45.3 1,584 Total
160
140
120
100
3
80
0
60
40
20
0
0
Subcatchment 3: DA3
Hydrograph
143.46 cfs
Type�ll 24-fir
100 ears - 24 hrs Rainfall=7.94"
Runoff ►ire';59.632 ac
Run�ff Volume=1�8.316 f
Runoff [Ye-pth—>3.69—
Flowl Length=1,584'
Tc=45.3 min
CN=64
L I
— t
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 8
Hydrograph for Subcatchment 3: DA3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.03
9.50
1.29
0.00
0.15
9.75
1.36
0.01
0.37
10.00
1.44
0.02
0.68
10.25
1.52
0.03
1.07
10.50
1.62
0.04
1.59
10.75
1.73
0.06
2.29
11.00
1.87
0.09
3.23
11.25
2.03
0.13
4.55
11.50
2.25
0.19
6.52
11.75
3.07
0.50
10.49
12.00
5.26
1.75
34.26
12.25
5.61
1.99
111.51
12.50
5.84
2.15
141.08
12.75
6.00
2.26
99.72
13.00
6.13
2.36
62.21
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
41.91
13.50
6.34
2.51
30.56
13.75
6.43
2.58
24.07
14.00
6.51
2.63
19.91
14.25
6.58
2.69
17.01
14.50
6.65
2.74
14.80
14.75
6.72
2.79
13.51
15.00
6.78
2.83
12.61
15.25
6.83
2.88
11.91
15.50
6.89
2.92
11.26
15.75
6.94
2.96
10.65
16.00
6.99
2.99
10.04
16.25
7.03
3.03
9.45
16.50
7.08
3.06
8.89
16.75
7.12
3.09
8.48
17.00
7.16
3.12
8.17
17.25
7.20
3.15
7.92
17.50
7.24
3.18
7.69
17.75
7.28
3.21
7.47
18.00
7.31
3.24
7.25
18.25
7.35
3.27
7.04
18.50
7.38
3.29
6.82
18.75
7.41
3.32
6.60
19.00
7.45
3.34
6.38
19.25
7.48
3.37
6.16
19.50
7.50
3.39
5.94
19.75
7.53
3.41
5.71
20.00
7.56
3.43
5.49
20.25
7.58
3.45
5.26
20.50
7.61
3.47
5.07
20.75
7.64
3.49
4.93
21.00
7.66
3.51
4.84
21.25
7.68
3.53
4.78
21.50
7.71
3.55
4.73
21.75
7.73
3.57
4.68
22.00
7.76
3.59
4.64
22.25
7.78
3.61
4.60
22.50
7.80
3.63
4.56
22.75
7.83
3.64
4.51
23.00
7.85
3.66
4.47
23.25
7.87
3.68
4.43
23.50
7.90
3.70
4.39
23.75
7.92
3.72
4.34
24.00
7.94
3.73
4.30

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 9
Summary for Subcatchment 4: DA4
Runoff = 132.63 cfs @ 12.35 hrs, Volume= 14.995 af, Depth> 3.69"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
29.229
70
Woods, Good, HSG C
19.486
55
Woods, Good, HSG B
48.715
64
Weighted Average
48.715
100.00% Pervious Area
Tc Length
(min) (feet)
Slope
(ft/ft)
Velocity
(ft/sec)
Capacity Description
(cfs)
22.9 100
0.0163
0.07
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
15.1 1,183
0.0684
1.31
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
38.0 1,283 Total
140
120
100
80
3
,° 60
40
20
0
0
Subcatchment 4: DA4
Hydrograph
132.63 cfs
Type II 24-11ir
100 )ears-.24_hrs Rainf'1=T.9 "
Runoff Area=48.715 ac
Runoff Volume=14.995 of
Runoff Depth>3.69"
Flowv_Length=1,283' —
Tc=38.0 min
C N k4 L I
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 10
Hydrograph for Subcatchment 4: DA4
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.03
9.50
1.29
0.00
0.17
9.75
1.36
0.01
0.39
10.00
1.44
0.02
0.67
10.25
1.52
0.03
1.03
10.50
1.62
0.04
1.50
10.75
1.73
0.06
2.14
11.00
1.87
0.09
3.01
11.25
2.03
0.13
4.23
11.50
2.25
0.19
6.11
11.75
3.07
0.50
10.33
12.00
5.26
1.75
40.70
12.25
5.61
1.99
121.93
12.50
5.84
2.15
115.34
12.75
6.00
2.26
66.39
13.00
6.13
2.36
40.59
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
27.67
13.50
6.34
2.51
21.00
13.75
6.43
2.58
17.16
14.00
6.51
2.63
14.49
14.25
6.58
2.69
12.71
14.50
6.65
2.74
11.43
14.75
6.72
2.79
10.59
15.00
6.78
2.83
9.98
15.25
6.83
2.88
9.46
15.50
6.89
2.92
8.96
15.75
6.94
2.96
8.48
16.00
6.99
2.99
7.99
16.25
7.03
3.03
7.50
16.50
7.08
3.06
7.08
16.75
7.12
3.09
6.78
17.00
7.16
3.12
6.57
17.25
7.20
3.15
6.38
17.50
7.24
3.18
6.20
17.75
7.28
3.21
6.02
18.00
7.31
3.24
5.84
18.25
7.35
3.27
5.67
18.50
7.38
3.29
5.49
18.75
7.41
3.32
5.31
19.00
7.45
3.34
5.13
19.25
7.48
3.37
4.95
19.50
7.50
3.39
4.77
19.75
7.53
3.41
4.58
20.00
7.56
3.43
4.40
20.25
7.58
3.45
4.22
20.50
7.61
3.47
4.07
20.75
7.64
3.49
3.98
21.00
7.66
3.51
3.92
21.25
7.68
3.53
3.88
21.50
7.71
3.55
3.85
21.75
7.73
3.57
3.81
22.00
7.76
3.59
3.78
22.25
7.78
3.61
3.74
22.50
7.80
3.63
3.71
22.75
7.83
3.64
3.67
23.00
7.85
3.66
3.64
23.25
7.87
3.68
3.60
23.50
7.90
3.70
3.57
23.75
7.92
3.72
3.53
24.00
7.94
3.73
3.50

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 11
Summary for Subcatchment 4S: DA 6
Runoff = 142.54 cfs @ 12.11 hrs, Volume= 10.205 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
19.776 70 Woods, Good, HSG C
13.184 55 Woods, Good, HSG B
32.960 64 Weighted Average
32.960 100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
13.4 100
0.0624
0.12
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
4.9 657
0.2014
2.24
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
18.3 757 Total
140
120
N 100
3
80
0
U_ 60
40
20
0
0
Subcatchment 4S: DA 6
Hydrograph
142.54 cfs
Type II 24-fir
100 years - 24 hrs Rainfall=7.94"
Runoff Area=32.960 ac
Runoff Vol} rne=10.205 of
Runoff Depth>1. 2"
Flo* Length=757,
Tc=18.3 min
CN=64
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 12
Hydrograph for Subcatchment 4S: DA 6
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.01
9.25
1.23
0.00
0.11
9.50
1.29
0.00
0.29
9.75
1.36
0.01
0.47
10.00
1.44
0.02
0.72
10.25
1.52
0.03
1.05
10.50
1.62
0.04
1.50
10.75
1.73
0.06
2.09
11.00
1.87
0.09
2.94
11.25
2.03
0.13
4.16
11.50
2.25
0.19
6.32
11.75
3.07
0.50
16.68
12.00
5.26
1.75
100.53
12.25
5.61
1.99
94.37
12.50
5.84
2.15
35.22
12.75
6.00
2.26
19.61
13.00
6.13
2.36
14.48
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
12.07
13.50
6.34
2.51
10.54
13.75
6.43
2.58
9.29
14.00
6.51
2.63
8.28
14.25
6.58
2.69
7.42
14.50
6.65
2.74
6.97
14.75
6.72
2.79
6.63
15.00
6.78
2.83
6.31
15.25
6.83
2.88
5.99
15.50
6.89
2.92
5.66
15.75
6.94
2.96
5.33
16.00
6.99
2.99
5.00
16.25
7.03
3.03
4.69
16.50
7.08
3.06
4.52
16.75
7.12
3.09
4.40
17.00
7.16
3.12
4.28
17.25
7.20
3.15
4.17
17.50
7.24
3.18
4.05
17.75
7.28
3.21
3.93
18.00
7.31
3.24
3.81
18.25
7.35
3.27
3.69
18.50
7.38
3.29
3.57
18.75
7.41
3.32
3.45
19.00
7.45
3.34
3.32
19.25
7.48
3.37
3.20
19.50
7.50
3.39
3.08
19.75
7.53
3.41
2.95
20.00
7.56
3.43
2.83
20.25
7.58
3.45
2.71
20.50
7.61
3.47
2.67
20.75
7.64
3.49
2.64
21.00
7.66
3.51
2.62
21.25
7.68
3.53
2.60
21.50
7.71
3.55
2.57
21.75
7.73
3.57
2.55
22.00
7.76
3.59
2.53
22.25
7.78
3.61
2.50
22.50
7.80
3.63
2.48
22.75
7.83
3.64
2.46
23.00
7.85
3.66
2.43
23.25
7.87
3.68
2.41
23.50
7.90
3.70
2.38
23.75
7.92
3.72
2.36
24.00
7.94
3.73
2.34

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 13
Summary for Subcatchment 5: DA5
Runoff = 129.14 cfs @ 12.54 hrs, Volume= 18.272 af, Depth> 3.68"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
35.768 70 Woods, Good, HSG C
23.845 55 Woods, Good, HSG B
59.613 64 Weighted Average
59.613 100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
13.2 100
0.0648
0.13
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
39.0 2,495
0.0454
1.07
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
52.2 2,595 Total
140
120
100
N
80
3
,° 60
40
20
0
0
Subcatchment 5: DA5
Hydrograph
129.14 cfs
Type II 24-11ir
100 ears - 24 hrs Rainfall=7.94"
Runoff Are=59.613 ac
Run?ff Volume=18.272 of
Runoff Depth>3.68"
FlowrLength=2;595'
Tc=52.2 min
CN=64 —
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 14
Hydrograph for Subcatchment 5: DA5
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.02
9.50
1.29
0.00
0.10
9.75
1.36
0.01
0.29
10.00
1.44
0.02
0.56
10.25
1.52
0.03
0.92
10.50
1.62
0.04
1.39
10.75
1.73
0.06
2.02
11.00
1.87
0.09
2.86
11.25
2.03
0.13
4.03
11.50
2.25
0.19
5.75
11.75
3.07
0.50
8.98
12.00
5.26
1.75
25.48
12.25
5.61
1.99
84.15
12.50
5.84
2.15
128.60
12.75
6.00
2.26
110.89
13.00
6.13
2.36
73.31
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
50.16
13.50
6.34
2.51
36.17
13.75
6.43
2.58
27.72
14.00
6.51
2.63
22.39
14.25
6.58
2.69
18.77
14.50
6.65
2.74
16.20
14.75
6.72
2.79
14.29
15.00
6.78
2.83
13.08
15.25
6.83
2.88
12.26
15.50
6.89
2.92
11.57
15.75
6.94
2.96
10.92
16.00
6.99
2.99
10.30
16.25
7.03
3.03
9.70
16.50
7.08
3.06
9.13
16.75
7.12
3.09
8.67
17.00
7.16
3.12
8.32
17.25
7.20
3.15
8.04
17.50
7.24
3.18
7.79
17.75
7.28
3.21
7.56
18.00
7.31
3.24
7.34
18.25
7.35
3.27
7.13
18.50
7.38
3.29
6.91
18.75
7.41
3.32
6.69
19.00
7.45
3.34
6.47
19.25
7.48
3.37
6.25
19.50
7.50
3.39
6.03
19.75
7.53
3.41
5.81
20.00
7.56
3.43
5.59
20.25
7.58
3.45
5.36
20.50
7.61
3.47
5.15
20.75
7.64
3.49
4.99
21.00
7.66
3.51
4.88
21.25
7.68
3.53
4.81
21.50
7.71
3.55
4.76
21.75
7.73
3.57
4.71
22.00
7.76
3.59
4.66
22.25
7.78
3.61
4.62
22.50
7.80
3.63
4.57
22.75
7.83
3.64
4.53
23.00
7.85
3.66
4.49
23.25
7.87
3.68
4.45
23.50
7.90
3.70
4.40
23.75
7.92
3.72
4.36
24.00
7.94
3.73
4.31

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 15
Summary for Subcatchment 6: DA 6
Runoff = 36.54 cfs @ 12.15 hrs, Volume= 2.866 af, Depth> 3.71"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
5.560
70
Woods, Good, HSG C
3.706
55
Woods, Good, HSG B
9.266
64
Weighted Average
9.266
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
10.6 100
0.1115
0.16
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
10.9 1,132
0.1206
1.74
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
21.5 1,232 Total
1�
N 2
y
3 2
0
" 1
1
Subcatchment 6: DA 6
Hydrograph
36.54 cfs
Type 11 24.r -
100 (ears -I24 hrslRainfT11=7.94t"
Rurrbff Area=9266 ac
Run?ff Volume=2.I866 afl
Runoff Depth->3.7f—
Flowl Length=1,232'
Tc=21.5 min
CN=64
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 16
Hydrograph for Subcatchment 6: DA 6
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.02
9.50
1.29
0.00
0.07
9.75
1.36
0.01
0.12
10.00
1.44
0.02
0.19
10.25
1.52
0.03
0.28
10.50
1.62
0.04
0.40
10.75
1.73
0.06
0.55
11.00
1.87
0.09
0.78
11.25
2.03
0.13
1.10
11.50
2.25
0.19
1.65
11.75
3.07
0.50
3.80
12.00
5.26
1.75
22.27
12.25
5.61
1.99
30.31
12.50
5.84
2.15
12.01
12.75
6.00
2.26
6.37
13.00
6.13
2.36
4.40
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
3.53
13.50
6.34
2.51
3.05
13.75
6.43
2.58
2.68
14.00
6.51
2.63
2.38
14.25
6.58
2.69
2.13
14.50
6.65
2.74
1.98
14.75
6.72
2.79
1.88
15.00
6.78
2.83
1.79
15.25
6.83
2.88
1.70
15.50
6.89
2.92
1.61
15.75
6.94
2.96
1.52
16.00
6.99
2.99
1.42
16.25
7.03
3.03
1.33
16.50
7.08
3.06
1.28
16.75
7.12
3.09
1.24
17.00
7.16
3.12
1.21
17.25
7.20
3.15
1.18
17.50
7.24
3.18
1.14
17.75
7.28
3.21
1.11
18.00
7.31
3.24
1.08
18.25
7.35
3.27
1.04
18.50
7.38
3.29
1.01
18.75
7.41
3.32
0.98
19.00
7.45
3.34
0.94
19.25
7.48
3.37
0.91
19.50
7.50
3.39
0.87
19.75
7.53
3.41
0.84
20.00
7.56
3.43
0.80
20.25
7.58
3.45
0.77
20.50
7.61
3.47
0.75
20.75
7.64
3.49
0.74
21.00
7.66
3.51
0.74
21.25
7.68
3.53
0.73
21.50
7.71
3.55
0.72
21.75
7.73
3.57
0.72
22.00
7.76
3.59
0.71
22.25
7.78
3.61
0.70
22.50
7.80
3.63
0.70
22.75
7.83
3.64
0.69
23.00
7.85
3.66
0.69
23.25
7.87
3.68
0.68
23.50
7.90
3.70
0.67
23.75
7.92
3.72
0.66
24.00
7.94
3.73
0.66

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 17
Summary for Subcatchment 7: DA7
Runoff = 9.96 cfs @ 12.65 hrs, Volume= 1.570 af, Depth> 3.67"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
3.081
70 Woods, Good, HSG C
2.054
55 Woods, Good, HSG B
5.135
64 Weighted Average
5.135
100.00% Pervious Area
Tc Length
Slope Velocity Capacity
Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
33.7 100
0.0062 0.05
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
25.7 607
0.0062 0.39
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
1.4 229
0.2863 2.68
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
60.8 936 Total
Subcatchment 7: DA7
Hydrograph
11
9.96 cfs
19
Type II 24-hr
9
00 ears - 24TirsIl�ainfall=7?S�L"
8
Runoff Are _'M3 aC
7
Runoff Vol �me=1.570 of T
Runoff Depth>3.67"
6
low Leng#o=936'
2 5
Tc=60.8 min
CN =4
4
3
2
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 18
Hydrograph for Subcatchment 7: DA7
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.00
9.50
1.29
0.00
0.01
9.75
1.36
0.01
0.02
10.00
1.44
0.02
0.04
10.25
1.52
0.03
0.06
10.50
1.62
0.04
0.10
10.75
1.73
0.06
0.15
11.00
1.87
0.09
0.21
11.25
2.03
0.13
0.30
11.50
2.25
0.19
0.43
11.75
3.07
0.50
0.65
12.00
5.26
1.75
1.62
12.25
5.61
1.99
5.11
12.50
5.84
2.15
9.23
12.75
6.00
2.26
9.69
13.00
6.13
2.36
7.50
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
5.20
13.50
6.34
2.51
3.78
13.75
6.43
2.58
2.86
14.00
6.51
2.63
2.26
14.25
6.58
2.69
1.86
14.50
6.65
2.74
1.57
14.75
6.72
2.79
1.37
15.00
6.78
2.83
1.22
15.25
6.83
2.88
1.11
15.50
6.89
2.92
1.04
15.75
6.94
2.96
0.97
16.00
6.99
2.99
0.92
16.25
7.03
3.03
0.86
16.50
7.08
3.06
0.81
16.75
7.12
3.09
0.77
17.00
7.16
3.12
0.73
17.25
7.20
3.15
0.71
17.50
7.24
3.18
0.68
17.75
7.28
3.21
0.66
18.00
7.31
3.24
0.64
18.25
7.35
3.27
0.62
18.50
7.38
3.29
0.61
18.75
7.41
3.32
0.59
19.00
7.45
3.34
0.57
19.25
7.48
3.37
0.55
19.50
7.50
3.39
0.53
19.75
7.53
3.41
0.51
20.00
7.56
3.43
0.49
20.25
7.58
3.45
0.47
20.50
7.61
3.47
0.45
20.75
7.64
3.49
0.44
21.00
7.66
3.51
0.43
21.25
7.68
3.53
0.42
21.50
7.71
3.55
0.41
21.75
7.73
3.57
0.41
22.00
7.76
3.59
0.40
22.25
7.78
3.61
0.40
22.50
7.80
3.63
0.40
22.75
7.83
3.64
0.39
23.00
7.85
3.66
0.39
23.25
7.87
3.68
0.38
23.50
7.90
3.70
0.38
23.75
7.92
3.72
0.38
24.00
7.94
3.73
0.37

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 19
Summary for Subcatchment 7S: (new Subcat)
Runoff = 46.77 cfs @ 12.16 hrs, Volume= 3.858 af, Depth> 5.54"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
8.354 80 Liner
8.354 100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
20.6 100
0.0030
0.08
Sheet Flow,
Grass: Short n= 0.150 P2= 3.31"
2.6 545
0.2507
3.50
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fDs
23.2 645 Total
5
4
4
3
3
3 2
0
'L 2
1
1
Subcatchment 7S: (new Subcat)
Hydrograph
46.77 cfs
Type II 24-hr I
100 ears - 24 hrslRainff 11=7.CIA"
-
Rundff Are=8.354 ac
-Runoff Vo4ume=3.1858 OF
Runoff Depth>5.54"
Flo* Length=645'I
Tc=23.2 min
CN=60
T
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 20
Hydrograph for Subcatchment 7S: (new Subcat)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.02
5.75
0.60
0.00
0.05
6.00
0.64
0.01
0.08
6.25
0.67
0.01
0.11
6.50
0.71
0.02
0.14
6.75
0.75
0.02
0.17
7.00
0.79
0.03
0.21
7.25
0.83
0.04
0.24
7.50
0.87
0.05
0.28
7.75
0.91
0.06
0.32
8.00
0.95
0.07
0.36
8.25
1.00
0.08
0.40
8.50
1.05
0.10
0.47
8.75
1.11
0.12
0.55
9.00
1.17
0.14
0.65
9.25
1.23
0.17
0.75
9.50
1.29
0.19
0.83
9.75
1.36
0.22
0.89
10.00
1.44
0.26
1.02
10.25
1.52
0.30
1.19
10.50
1.62
0.35
1.42
10.75
1.73
0.41
1.71
11.00
1.87
0.48
2.10
11.25
2.03
0.58
2.63
11.50
2.25
0.72
3.52
11.75
3.07
1.30
6.61
12.00
5.26
3.12
29.53
12.25
5.61
3.43
40.69
12.50
5.84
3.63
16.32
12.75
6.00
3.78
8.19
13.00
6.13
3.90
5.33
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
4.00
4.11
13.50
6.34
4.09
3.50
13.75
6.43
4.17
3.06
14.00
6.51
4.25
2.71
14.25
6.58
4.31
2.41
14.50
6.65
4.37
2.22
14.75
6.72
4.43
2.10
15.00
6.78
4.49
1.99
15.25
6.83
4.54
1.89
15.50
6.89
4.59
1.78
15.75
6.94
4.64
1.68
16.00
6.99
4.68
1.57
16.25
7.03
4.72
1.47
16.50
7.08
4.76
1.41
16.75
7.12
4.80
1.36
17.00
7.16
4.84
1.32
17.25
7.20
4.88
1.29
17.50
7.24
4.92
1.25
17.75
7.28
4.95
1.21
18.00
7.31
4.98
1.17
18.25
7.35
5.02
1.13
18.50
7.38
5.05
1.10
18.75
7.41
5.08
1.06
19.00
7.45
5.11
1.02
19.25
7.48
5.14
0.98
19.50
7.50
5.16
0.94
19.75
7.53
5.19
0.90
20.00
7.56
5.21
0.87
20.25
7.58
5.24
0.83
20.50
7.61
5.26
0.81
20.75
7.64
5.28
0.80
21.00
7.66
5.31
0.79
21.25
7.68
5.33
0.78
21.50
7.71
5.35
0.78
21.75
7.73
5.38
0.77
22.00
7.76
5.40
0.76
22.25
7.78
5.42
0.75
22.50
7.80
5.44
0.75
22.75
7.83
5.46
0.74
23.00
7.85
5.49
0.73
23.25
7.87
5.51
0.72
23.50
7.90
5.53
0.72
23.75
7.92
5.55
0.71
24.00
7.94
5.57
0.70

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 21
Summary for Subcatchment 8S: (new Subcat)
Runoff = 444.38 cfs @ 12.87 hrs, Volume= 83.991 af, Depth> 4.55"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
106.251
80
Liner
69.265
70
Woods, Good, HSG C
46.176
55
Woods, Good, HSG B
221.692
72
Weighted Average
221.692
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
42.1
100
0.0005
0.04
Sheet Flow,
Grass: Short n= 0.150 P2= 3.31"
2.2
457
0.2366
3.40
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
13.8
5,725
0.0117
6.93
249.66 Channel Flow,
Area= 36.0 sf Perim= 19.4' r= 1.86' n= 0.035
21.7
1,506
0.0536
1.16
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
79.8 7,788 Total
450
400
350
300
250
200
150
100
50
0
Subcatchment 8S: (new Subcat)
Hydrograph
444.38 cfs
Type11124-fir
100 ears - 24-hr. 1Tainfa�,4 l=7"
Runoff Are =22192 at
Run?ff Volume=83.991 �f
Runoff Depth>4.55"
Flo* Length=7,788'
Tc 79.8 min
CN=f2 L
0 2 4 6 8 10 12 14
Time (hours)
16 18 20 22 24
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 22
Hydrograph for Subcatchment 8S: (new Subcat)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.03
7.75
0.91
0.00
0.14
8.00
0.95
0.01
0.39
8.25
1.00
0.01
0.80
8.50
1.05
0.02
1.36
8.75
1.11
0.03
2.06
9.00
1.17
0.04
2.93
9.25
1.23
0.05
4.00
9.50
1.29
0.06
5.29
9.75
1.36
0.08
6.73
10.00
1.44
0.10
8.27
10.25
1.52
0.12
9.95
10.50
1.62
0.15
11.97
10.75
1.73
0.19
14.54
11.00
1.87
0.24
17.89
11.25
2.03
0.31
22.35
11.50
2.25
0.40
28.40
11.75
3.07
0.85
37.79
12.00
5.26
2.40
67.17
12.25
5.61
2.67
161.12
12.50
5.84
2.86
317.08
12.75
6.00
2.99
428.46
13.00
6.13
3.10
434.12
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
3.19
365.84
13.50
6.34
3.28
274.82
13.75
6.43
3.35
208.61
14.00
6.51
3.42
162.65
14.25
6.58
3.48
129.67
14.50
6.65
3.53
105.67
14.75
6.72
3.59
88.15
15.00
6.78
3.64
75.66
15.25
6.83
3.69
66.38
15.50
6.89
3.73
59.70
15.75
6.94
3.78
54.52
16.00
6.99
3.82
50.19
16.25
7.03
3.86
46.23
16.50
7.08
3.89
42.82
16.75
7.12
3.93
40.26
17.00
7.16
3.97
38.01
17.25
7.20
4.00
36.23
17.50
7.24
4.03
34.75
17.75
7.28
4.07
33.47
18.00
7.31
4.10
32.38
18.25
7.35
4.13
31.29
18.50
7.38
4.16
30.32
18.75
7.41
4.18
29.35
19.00
7.45
4.21
28.38
19.25
7.48
4.24
27.47
19.50
7.50
4.26
26.50
19.75
7.53
4.29
25.59
20.00
7.56
4.31
24.64
20.25
7.58
4.33
23.70
20.50
7.61
4.35
22.80
20.75
7.64
4.38
21.92
21.00
7.66
4.40
21.23
21.25
7.68
4.42
20.65
21.50
7.71
4.44
20.23
21.75
7.73
4.46
19.90
22.00
7.76
4.48
19.61
22.25
7.78
4.50
19.39
22.50
7.80
4.52
19.15
22.75
7.83
4.54
18.96
23.00
7.85
4.56
18.76
23.25
7.87
4.58
18.56
23.50
7.90
4.60
18.39
23.75
7.92
4.62
18.19
24.00
7.94
4.64
18.02

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 23
Summary for Subcatchment 9: DA 9
Runoff = 243.78 cfs @ 12.20 hrs, Volume= 21.433 af, Depth> 3.71"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
41.628
70
Woods, Good, HSG C
27.752
55
Woods, Good, HSG B
69.380
64
Weighted Average
69.380
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
16.2 100
0.0385
0.10
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
9.7 1,098
0.1413
1.88
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
25.9 1,198 Total
250
200
150
3
0
LL 100
50
1
Subcatchment 9: DA 9
Hydrograph
243.78 cfs
Type II 24-11ir
100 years ­24 hrs Rainfall=7.94"
Runoff Area=69.380 ac
Runoff Volume=21.433 �f
Runoff Depth>3.71"
Flo*_Length=9, IJ8'
Tc=25.9 min
CN=44
I
L I
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 24
Hydrograph for Subcatchment 9: DA 9
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.13
9.50
1.29
0.00
0.44
9.75
1.36
0.01
0.81
10.00
1.44
0.02
1.28
10.25
1.52
0.03
1.89
10.50
1.62
0.04
2.72
10.75
1.73
0.06
3.81
11.00
1.87
0.09
5.36
11.25
2.03
0.13
7.53
11.50
2.25
0.19
11.20
11.75
3.07
0.50
22.54
12.00
5.26
1.75
122.20
12.25
5.61
1.99
235.23
12.50
5.84
2.15
112.96
12.75
6.00
2.26
58.79
13.00
6.13
2.36
37.63
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
28.63
13.50
6.34
2.51
23.83
13.75
6.43
2.58
20.83
14.00
6.51
2.63
18.45
14.25
6.58
2.69
16.47
14.50
6.65
2.74
15.14
14.75
6.72
2.79
14.32
15.00
6.78
2.83
13.61
15.25
6.83
2.88
12.93
15.50
6.89
2.92
12.24
15.75
6.94
2.96
11.55
16.00
6.99
2.99
10.85
16.25
7.03
3.03
10.16
16.50
7.08
3.06
9.69
16.75
7.12
3.09
9.39
17.00
7.16
3.12
9.13
17.25
7.20
3.15
8.89
17.50
7.24
3.18
8.64
17.75
7.28
3.21
8.39
18.00
7.31
3.24
8.14
18.25
7.35
3.27
7.88
18.50
7.38
3.29
7.63
18.75
7.41
3.32
7.37
19.00
7.45
3.34
7.12
19.25
7.48
3.37
6.86
19.50
7.50
3.39
6.60
19.75
7.53
3.41
6.33
20.00
7.56
3.43
6.07
20.25
7.58
3.45
5.82
20.50
7.61
3.47
5.67
20.75
7.64
3.49
5.59
21.00
7.66
3.51
5.54
21.25
7.68
3.53
5.49
21.50
7.71
3.55
5.44
21.75
7.73
3.57
5.39
22.00
7.76
3.59
5.34
22.25
7.78
3.61
5.29
22.50
7.80
3.63
5.24
22.75
7.83
3.64
5.19
23.00
7.85
3.66
5.14
23.25
7.87
3.68
5.09
23.50
7.90
3.70
5.04
23.75
7.92
3.72
4.99
24.00
7.94
3.73
4.94

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 25
Summary for Subcatchment 9S: (new Subcat)
Runoff = 187.80 cfs @ 12.25 hrs, Volume= 17.975 af, Depth> 3.70"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
34.950
70
Woods, Good, HSG C
23.300
55
Woods, Good, HSG B
58.250
64
Weighted Average
58.250
100.00% Pervious Area
Tc
Length
Slope
Velocity Capacity
Description
(min)
(feet)
(ft/ft)
(ft/sec) (cfs)
13.6
100
0.0603
0.12
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
9.9
721
0.0595
1.22
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
0.8
62
0.0690
1.31
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
4.0
277
0.0522
1.14
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
1.3
1,049
0.0035
13.41 18,437.07
Channel Flow,
Area= 1,375.1 sf Perim= 111.5' r= 12.33' n= 0.035
29.6 2,209 Total
200
180
160
140
120
3 100
80
60
40
20
0
Subcatchment 9S: (new Subcat)
Hydrograph
TGA"
Type 11 2"- r
100 ears -i24 hr� Rainf
Run�ff Area=58.250 ac
Runoff Volume=17�375 Runoff Depth>3.70" _
Flo* Length=2,2Q9'
Tc=29.6 inin — — — — — — — — —
CN=64
L __1 J� V I
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 26
Hydrograph for Subcatchment 9S: (new Subcat)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.08
9.50
1.29
0.00
0.31
9.75
1.36
0.01
0.61
10.00
1.44
0.02
0.98
10.25
1.52
0.03
1.47
10.50
1.62
0.04
2.12
10.75
1.73
0.06
2.99
11.00
1.87
0.09
4.20
11.25
2.03
0.13
5.89
11.50
2.25
0.19
8.68
11.75
3.07
0.50
16.20
12.00
5.26
1.75
80.10
12.25
5.61
1.99
187.76
12.50
5.84
2.15
111.41
12.75
6.00
2.26
58.38
13.00
6.13
2.36
35.91
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
26.28
13.50
6.34
2.51
21.11
13.75
6.43
2.58
18.10
14.00
6.51
2.63
15.95
14.25
6.58
2.69
14.21
14.50
6.65
2.74
12.97
14.75
6.72
2.79
12.19
15.00
6.78
2.83
11.57
15.25
6.83
2.88
10.99
15.50
6.89
2.92
10.41
15.75
6.94
2.96
9.83
16.00
6.99
2.99
9.24
16.25
7.03
3.03
8.66
16.50
7.08
3.06
8.22
16.75
7.12
3.09
7.95
17.00
7.16
3.12
7.72
17.25
7.20
3.15
7.51
17.50
7.24
3.18
7.30
17.75
7.28
3.21
7.09
18.00
7.31
3.24
6.88
18.25
7.35
3.27
6.67
18.50
7.38
3.29
6.45
18.75
7.41
3.32
6.24
19.00
7.45
3.34
6.02
19.25
7.48
3.37
5.81
19.50
7.50
3.39
5.59
19.75
7.53
3.41
5.37
20.00
7.56
3.43
5.15
20.25
7.58
3.45
4.93
20.50
7.61
3.47
4.79
20.75
7.64
3.49
4.71
21.00
7.66
3.51
4.66
21.25
7.68
3.53
4.62
21.50
7.71
3.55
4.57
21.75
7.73
3.57
4.53
22.00
7.76
3.59
4.49
22.25
7.78
3.61
4.45
22.50
7.80
3.63
4.41
22.75
7.83
3.64
4.37
23.00
7.85
3.66
4.33
23.25
7.87
3.68
4.29
23.50
7.90
3.70
4.24
23.75
7.92
3.72
4.20
24.00
7.94
3.73
4.16

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 27
Summary for Subcatchment 10: DA 10
Runoff = 112.70 cfs @ 12.08 hrs, Volume= 7.472 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
14.468
70
Woods, Good, HSG C
9.646
55
Woods, Good, HSG B
24.114
64
Weighted Average
24.114
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
9.9 100
0.1343
0.17
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
5.8 595
0.1187
1.72
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
15.7 695 Total
120
110
100
90
N 80
70
3 60
FZ 50
40
30
20
10
0
Subcatchment 10: DA 10
Hydrograph
112.70 cfs
Type�ll 24-fir
100-years— 24-hrs Rainfatl=7 ,4"
Runoff Are=24.`IIU ac
Runoff Volume=7I.472 aft
Runoff Depth>3.72"
Flow-Length=695'
Tc=15.7 -min
CN=64
T T
T
T T
T
— T
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 28
Hydrograph for Subcatchment 10: DA 10
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.01
9.25
1.23
0.00
0.10
9.50
1.29
0.00
0.23
9.75
1.36
0.01
0.37
10.00
1.44
0.02
0.56
10.25
1.52
0.03
0.81
10.50
1.62
0.04
1.15
10.75
1.73
0.06
1.61
11.00
1.87
0.09
2.26
11.25
2.03
0.13
3.22
11.50
2.25
0.19
4.91
11.75
3.07
0.50
14.94
12.00
5.26
1.75
89.59
12.25
5.61
1.99
57.26
12.50
5.84
2.15
21.97
12.75
6.00
2.26
12.93
13.00
6.13
2.36
10.21
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
8.59
13.50
6.34
2.51
7.55
13.75
6.43
2.58
6.66
14.00
6.51
2.63
5.94
14.25
6.58
2.69
5.35
14.50
6.65
2.74
5.05
14.75
6.72
2.79
4.81
15.00
6.78
2.83
4.58
15.25
6.83
2.88
4.34
15.50
6.89
2.92
4.10
15.75
6.94
2.96
3.86
16.00
6.99
2.99
3.62
16.25
7.03
3.03
3.40
16.50
7.08
3.06
3.29
16.75
7.12
3.09
3.21
17.00
7.16
3.12
3.12
17.25
7.20
3.15
3.03
17.50
7.24
3.18
2.95
17.75
7.28
3.21
2.86
18.00
7.31
3.24
2.77
18.25
7.35
3.27
2.68
18.50
7.38
3.29
2.60
18.75
7.41
3.32
2.51
19.00
7.45
3.34
2.42
19.25
7.48
3.37
2.33
19.50
7.50
3.39
2.24
19.75
7.53
3.41
2.14
20.00
7.56
3.43
2.05
20.25
7.58
3.45
1.98
20.50
7.61
3.47
1.95
20.75
7.64
3.49
1.93
21.00
7.66
3.51
1.91
21.25
7.68
3.53
1.90
21.50
7.71
3.55
1.88
21.75
7.73
3.57
1.86
22.00
7.76
3.59
1.85
22.25
7.78
3.61
1.83
22.50
7.80
3.63
1.81
22.75
7.83
3.64
1.79
23.00
7.85
3.66
1.78
23.25
7.87
3.68
1.76
23.50
7.90
3.70
1.74
23.75
7.92
3.72
1.72
24.00
7.94
3.73
1.71

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 29
Summary for Subcatchment 11: DA 11
Runoff = 136.61 cfs @ 12.25 hrs, Volume= 13.221 af, Depth> 3.70"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
25.710 70 Woods, Good, HSG C
17.140 55 Woods, Good, HSG B
42.850 64 Weighted Average
42.850 100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
11.4 100
0.0936
0.15
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
18.7 1,561
0.0776
1.39
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
30.1 1,661 Total
140
120
100
80
3
FL 60
40
20
0
0
Subcatchment 11: DA 11
Hydrograph
136.61 cfs
Type II 24-hr
100 years - 24 hrs-Rainfall=7 94"
Runoff Area=42.850 ac
Run?ff Volume=13.221 of
Runoff Depth>3.70"
FlovA(Length=1,661'
Tc=30.1 m i n
CN=64
F
fi
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 30
Hydrograph for Subcatchment 11: DA 11
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.06
9.50
1.29
0.00
0.22
9.75
1.36
0.01
0.44
10.00
1.44
0.02
0.71
10.25
1.52
0.03
1.07
10.50
1.62
0.04
1.54
10.75
1.73
0.06
2.18
11.00
1.87
0.09
3.06
11.25
2.03
0.13
4.30
11.50
2.25
0.19
6.31
11.75
3.07
0.50
11.69
12.00
5.26
1.75
57.05
12.25
5.61
1.99
136.60
12.50
5.84
2.15
83.59
12.75
6.00
2.26
43.89
13.00
6.13
2.36
26.89
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
19.57
13.50
6.34
2.51
15.68
13.75
6.43
2.58
13.38
14.00
6.51
2.63
11.79
14.25
6.58
2.69
10.49
14.50
6.65
2.74
9.56
14.75
6.72
2.79
8.99
15.00
6.78
2.83
8.53
15.25
6.83
2.88
8.09
15.50
6.89
2.92
7.67
15.75
6.94
2.96
7.24
16.00
6.99
2.99
6.81
16.25
7.03
3.03
6.38
16.50
7.08
3.06
6.06
16.75
7.12
3.09
5.85
17.00
7.16
3.12
5.68
17.25
7.20
3.15
5.53
17.50
7.24
3.18
5.38
17.75
7.28
3.21
5.22
18.00
7.31
3.24
5.06
18.25
7.35
3.27
4.91
18.50
7.38
3.29
4.75
18.75
7.41
3.32
4.60
19.00
7.45
3.34
4.44
19.25
7.48
3.37
4.28
19.50
7.50
3.39
4.12
19.75
7.53
3.41
3.95
20.00
7.56
3.43
3.79
20.25
7.58
3.45
3.63
20.50
7.61
3.47
3.52
20.75
7.64
3.49
3.47
21.00
7.66
3.51
3.43
21.25
7.68
3.53
3.40
21.50
7.71
3.55
3.37
21.75
7.73
3.57
3.34
22.00
7.76
3.59
3.31
22.25
7.78
3.61
3.28
22.50
7.80
3.63
3.25
22.75
7.83
3.64
3.21
23.00
7.85
3.66
3.18
23.25
7.87
3.68
3.15
23.50
7.90
3.70
3.12
23.75
7.92
3.72
3.09
24.00
7.94
3.73
3.06

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 31
Summary for Subcatchment 12: DA 12
Runoff = 4.92 cfs @ 12.08 hrs, Volume= 0.326 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
0.632
70 Woods, Good, HSG C
0.421
55 Woods, Good, HSG B
1.053
64 Weighted Average
1.053
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
13.3 100
0.0630
0.12
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
2.4 229
0.1036
1.61
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
15.7 329 Total
3
3
0
2
i
0L
0
Subcatchment 12: DA 12
Hydrograph
4.92 cfs
Type II 24-hr
100 years - 24 hrsl Rainf�11=7.94"
Runoff Area=1.053-ac T
Runoff Volume=0.326 of
Runoff Depth>3.72"
Flow-Length=329'
Tc=15.7 min
CN=64
L_
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 32
Hydrograph for Subcatchment 12: DA 12
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.00
9.50
1.29
0.00
0.01
9.75
1.36
0.01
0.02
10.00
1.44
0.02
0.02
10.25
1.52
0.03
0.04
10.50
1.62
0.04
0.05
10.75
1.73
0.06
0.07
11.00
1.87
0.09
0.10
11.25
2.03
0.13
0.14
11.50
2.25
0.19
0.21
11.75
3.07
0.50
0.65
12.00
5.26
1.75
3.91
12.25
5.61
1.99
2.50
12.50
5.84
2.15
0.96
12.75
6.00
2.26
0.56
13.00
6.13
2.36
0.45
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
0.38
13.50
6.34
2.51
0.33
13.75
6.43
2.58
0.29
14.00
6.51
2.63
0.26
14.25
6.58
2.69
0.23
14.50
6.65
2.74
0.22
14.75
6.72
2.79
0.21
15.00
6.78
2.83
0.20
15.25
6.83
2.88
0.19
15.50
6.89
2.92
0.18
15.75
6.94
2.96
0.17
16.00
6.99
2.99
0.16
16.25
7.03
3.03
0.15
16.50
7.08
3.06
0.14
16.75
7.12
3.09
0.14
17.00
7.16
3.12
0.14
17.25
7.20
3.15
0.13
17.50
7.24
3.18
0.13
17.75
7.28
3.21
0.12
18.00
7.31
3.24
0.12
18.25
7.35
3.27
0.12
18.50
7.38
3.29
0.11
18.75
7.41
3.32
0.11
19.00
7.45
3.34
0.11
19.25
7.48
3.37
0.10
19.50
7.50
3.39
0.10
19.75
7.53
3.41
0.09
20.00
7.56
3.43
0.09
20.25
7.58
3.45
0.09
20.50
7.61
3.47
0.09
20.75
7.64
3.49
0.08
21.00
7.66
3.51
0.08
21.25
7.68
3.53
0.08
21.50
7.71
3.55
0.08
21.75
7.73
3.57
0.08
22.00
7.76
3.59
0.08
22.25
7.78
3.61
0.08
22.50
7.80
3.63
0.08
22.75
7.83
3.64
0.08
23.00
7.85
3.66
0.08
23.25
7.87
3.68
0.08
23.50
7.90
3.70
0.08
23.75
7.92
3.72
0.08
24.00
7.94
3.73
0.07

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 33
Summary for Subcatchment 13: DA 13
Runoff = 37.71 cfs @ 12.04 hrs, Volume= 2.214 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
4.282
70 Woods, Good, HSG C
2.855
55 Woods, Good, HSG B
7.137
64 Weighted Average
7.137
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
7.3 100
0.2842
0.23
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
4.8 532
0.1367
1.85
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
12.1 632 Total
4
3
3
2
3 2
0
U_
1
1
Subcatchment 13: DA 13
Hydrograph
37.71 cfs
Type II 24-h r
100 ears - 24 hrsl Rainf111=7.94 "
Buzff Are 7._13Zac
Run?ff Volume=2.214 of
-Runoff Depth->3.7
Flo* Length=632'I
Tc=12.1 min — — — — - - -
CN=64
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 34
Hydrograph for Subcatchment 13: DA 13
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.04
9.50
1.29
0.00
0.08
9.75
1.36
0.01
0.12
10.00
1.44
0.02
0.18
10.25
1.52
0.03
0.26
10.50
1.62
0.04
0.37
10.75
1.73
0.06
0.51
11.00
1.87
0.09
0.72
11.25
2.03
0.13
1.04
11.50
2.25
0.19
1.58
11.75
3.07
0.50
6.09
12.00
5.26
1.75
34.68
12.25
5.61
1.99
11.88
12.50
5.84
2.15
5.34
12.75
6.00
2.26
3.49
13.00
6.13
2.36
2.89
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
2.46
13.50
6.34
2.51
2.17
13.75
6.43
2.58
1.92
14.00
6.51
2.63
1.71
14.25
6.58
2.69
1.55
14.50
6.65
2.74
1.48
14.75
6.72
2.79
1.41
15.00
6.78
2.83
1.34
15.25
6.83
2.88
1.27
15.50
6.89
2.92
1.20
15.75
6.94
2.96
1.13
16.00
6.99
2.99
1.05
16.25
7.03
3.03
1.00
16.50
7.08
3.06
0.97
16.75
7.12
3.09
0.94
17.00
7.16
3.12
0.92
17.25
7.20
3.15
0.89
17.50
7.24
3.18
0.87
17.75
7.28
3.21
0.84
18.00
7.31
3.24
0.81
18.25
7.35
3.27
0.79
18.50
7.38
3.29
0.76
18.75
7.41
3.32
0.74
19.00
7.45
3.34
0.71
19.25
7.48
3.37
0.68
19.50
7.50
3.39
0.66
19.75
7.53
3.41
0.63
20.00
7.56
3.43
0.60
20.25
7.58
3.45
0.58
20.50
7.61
3.47
0.58
20.75
7.64
3.49
0.57
21.00
7.66
3.51
0.57
21.25
7.68
3.53
0.56
21.50
7.71
3.55
0.56
21.75
7.73
3.57
0.55
22.00
7.76
3.59
0.55
22.25
7.78
3.61
0.54
22.50
7.80
3.63
0.53
22.75
7.83
3.64
0.53
23.00
7.85
3.66
0.52
23.25
7.87
3.68
0.52
23.50
7.90
3.70
0.51
23.75
7.92
3.72
0.51
24.00
7.94
3.73
0.50

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 35
Summary for Subcatchment 14: DA 14
Runoff = 6.30 cfs @ 12.01 hrs, Volume= 0.341 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac)
CN
Description
0.660
70
Woods, Good, HSG C
0.440
55
Woods, Good, HSG B
1.100
64
Weighted Average
1.100
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
8.4 100
0.2027
0.20
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
1.3 80
0.0443
1.05
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
9.7 180 Total
7
6
5
4-
3
0 3
U_
2
1
0
0
Subcatchment 14: DA 14
Hydrograph
6.30 cfs
Type II 24-hr
100 years - 24 hrsl Rainfa11=7.94"
Runoff Areaa=1.100 ac
Runoff Volume=0:341 of
Runoff Depth>3.72"
Flow Length=180'I
Tc=9.7 min
EN=64
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 36
Hydrograph for Subcatchment 14: DA 14
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.01
9.50
1.29
0.00
0.01
9.75
1.36
0.01
0.02
10.00
1.44
0.02
0.03
10.25
1.52
0.03
0.04
10.50
1.62
0.04
0.06
10.75
1.73
0.06
0.08
11.00
1.87
0.09
0.12
11.25
2.03
0.13
0.17
11.50
2.25
0.19
0.26
11.75
3.07
0.50
1.18
12.00
5.26
1.75
6.23
12.25
5.61
1.99
1.40
12.50
5.84
2.15
0.74
12.75
6.00
2.26
0.52
13.00
6.13
2.36
0.43
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
0.37
13.50
6.34
2.51
0.33
13.75
6.43
2.58
0.29
14.00
6.51
2.63
0.26
14.25
6.58
2.69
0.24
14.50
6.65
2.74
0.23
14.75
6.72
2.79
0.22
15.00
6.78
2.83
0.20
15.25
6.83
2.88
0.19
15.50
6.89
2.92
0.18
15.75
6.94
2.96
0.17
16.00
6.99
2.99
0.16
16.25
7.03
3.03
0.15
16.50
7.08
3.06
0.15
16.75
7.12
3.09
0.14
17.00
7.16
3.12
0.14
17.25
7.20
3.15
0.14
17.50
7.24
3.18
0.13
17.75
7.28
3.21
0.13
18.00
7.31
3.24
0.12
18.25
7.35
3.27
0.12
18.50
7.38
3.29
0.12
18.75
7.41
3.32
0.11
19.00
7.45
3.34
0.11
19.25
7.48
3.37
0.10
19.50
7.50
3.39
0.10
19.75
7.53
3.41
0.10
20.00
7.56
3.43
0.09
20.25
7.58
3.45
0.09
20.50
7.61
3.47
0.09
20.75
7.64
3.49
0.09
21.00
7.66
3.51
0.09
21.25
7.68
3.53
0.09
21.50
7.71
3.55
0.09
21.75
7.73
3.57
0.08
22.00
7.76
3.59
0.08
22.25
7.78
3.61
0.08
22.50
7.80
3.63
0.08
22.75
7.83
3.64
0.08
23.00
7.85
3.66
0.08
23.25
7.87
3.68
0.08
23.50
7.90
3.70
0.08
23.75
7.92
3.72
0.08
24.00
7.94
3.73
0.08

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 37
Summary for Subcatchment 15: DA 15
Runoff = 17.91 cfs @ 12.09 hrs, Volume= 1.208 af, Depth> 3.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
2.339
70 Woods, Good, HSG C
1.559
55 Woods, Good, HSG B
3.898
64 Weighted Average
3.898
100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
13.1 100
0.0654
0.13
Sheet Flow,
Woods: Light underbrush n= 0.400 P2= 3.31"
3.2 208
0.0462
1.07
Shallow Concentrated Flow,
Woodland Kv= 5.0 fDs
M011311111111[*M.
2
1
1
1
3 1
0
FL
Subcatchment 15: DA 15
Hydrograph
0--
17.91
cfs
8
Type) 1124-hr
6
0 arm 24-hrslRain
Runoff Are=3.898
1=7-4A"
4
ac
Run?ff Volume=1.208 of
2
-Runoff Depth>3.7
— — —
Flowl Length=308'I
c 16.3 min
8
CN14
6
4
-
—I -
-
2
-
0
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 38
Hydrograph for Subcatchment 15: DA 15
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.00
5.50
0.57
0.00
0.00
5.75
0.60
0.00
0.00
6.00
0.64
0.00
0.00
6.25
0.67
0.00
0.00
6.50
0.71
0.00
0.00
6.75
0.75
0.00
0.00
7.00
0.79
0.00
0.00
7.25
0.83
0.00
0.00
7.50
0.87
0.00
0.00
7.75
0.91
0.00
0.00
8.00
0.95
0.00
0.00
8.25
1.00
0.00
0.00
8.50
1.05
0.00
0.00
8.75
1.11
0.00
0.00
9.00
1.17
0.00
0.00
9.25
1.23
0.00
0.02
9.50
1.29
0.00
0.04
9.75
1.36
0.01
0.06
10.00
1.44
0.02
0.09
10.25
1.52
0.03
0.13
10.50
1.62
0.04
0.18
10.75
1.73
0.06
0.26
11.00
1.87
0.09
0.36
11.25
2.03
0.13
0.51
11.50
2.25
0.19
0.78
11.75
3.07
0.50
2.30
12.00
5.26
1.75
13.84
12.25
5.61
1.99
9.72
12.50
5.84
2.15
3.68
12.75
6.00
2.26
2.14
13.00
6.13
2.36
1.66
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
2.44
1.40
13.50
6.34
2.51
1.23
13.75
6.43
2.58
1.08
14.00
6.51
2.63
0.96
14.25
6.58
2.69
0.87
14.50
6.65
2.74
0.82
14.75
6.72
2.79
0.78
15.00
6.78
2.83
0.74
15.25
6.83
2.88
0.70
15.50
6.89
2.92
0.66
15.75
6.94
2.96
0.63
16.00
6.99
2.99
0.59
16.25
7.03
3.03
0.55
16.50
7.08
3.06
0.53
16.75
7.12
3.09
0.52
17.00
7.16
3.12
0.50
17.25
7.20
3.15
0.49
17.50
7.24
3.18
0.48
17.75
7.28
3.21
0.46
18.00
7.31
3.24
0.45
18.25
7.35
3.27
0.43
18.50
7.38
3.29
0.42
18.75
7.41
3.32
0.41
19.00
7.45
3.34
0.39
19.25
7.48
3.37
0.38
19.50
7.50
3.39
0.36
19.75
7.53
3.41
0.35
20.00
7.56
3.43
0.33
20.25
7.58
3.45
0.32
20.50
7.61
3.47
0.32
20.75
7.64
3.49
0.31
21.00
7.66
3.51
0.31
21.25
7.68
3.53
0.31
21.50
7.71
3.55
0.30
21.75
7.73
3.57
0.30
22.00
7.76
3.59
0.30
22.25
7.78
3.61
0.30
22.50
7.80
3.63
0.29
22.75
7.83
3.64
0.29
23.00
7.85
3.66
0.29
23.25
7.87
3.68
0.28
23.50
7.90
3.70
0.28
23.75
7.92
3.72
0.28
24.00
7.94
3.73
0.28

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 39
Summary for Subcatchment 16S: (new Subcat)
Runoff = 36.06 cfs @ 11.97 hrs, Volume= 1.818 af, Depth> 5.56"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type II 24-hr 100 years - 24 hrs Rainfall=7.94"
Area (ac) CN Description
3.921 80 Liner
3.921 100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
4.3 100
0.1543
0.39
Sheet Flow,
Grass: Short n= 0.150 P2= 3.31"
1.8 370
0.2504
3.50
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
6.1 470 Total
4
3
3
0 2
4-
3
3 2
0
" 1
1
Subcatchment 16S: (new Subcat)
Hydrograph
36.06 cfs
Type IT24--hr
10 yews - 24 hrs R infall=7.94"
unoo f Area=3.921-at
Runoff Volu a=1.818 of
Runoff Oepth>5.56"
(Flow 4ength=470'
—Tc=6.1 min
CN=80
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Runoff

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 40
Hydrograph for Subcatchment 16S: (new Subcat)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
0.25
0.02
0.00
0.00
0.50
0.04
0.00
0.00
0.75
0.06
0.00
0.00
1.00
0.08
0.00
0.00
1.25
0.11
0.00
0.00
1.50
0.13
0.00
0.00
1.75
0.15
0.00
0.00
2.00
0.17
0.00
0.00
2.25
0.20
0.00
0.00
2.50
0.22
0.00
0.00
2.75
0.25
0.00
0.00
3.00
0.27
0.00
0.00
3.25
0.30
0.00
0.00
3.50
0.33
0.00
0.00
3.75
0.35
0.00
0.00
4.00
0.38
0.00
0.00
4.25
0.41
0.00
0.00
4.50
0.44
0.00
0.00
4.75
0.47
0.00
0.00
5.00
0.50
0.00
0.00
5.25
0.53
0.00
0.01
5.50
0.57
0.00
0.02
5.75
0.60
0.00
0.04
6.00
0.64
0.01
0.05
6.25
0.67
0.01
0.07
6.50
0.71
0.02
0.08
6.75
0.75
0.02
0.10
7.00
0.79
0.03
0.12
7.25
0.83
0.04
0.13
7.50
0.87
0.05
0.15
7.75
0.91
0.06
0.17
8.00
0.95
0.07
0.19
8.25
1.00
0.08
0.22
8.50
1.05
0.10
0.26
8.75
1.11
0.12
0.31
9.00
1.17
0.14
0.36
9.25
1.23
0.17
0.39
9.50
1.29
0.19
0.42
9.75
1.36
0.22
0.47
10.00
1.44
0.26
0.56
10.25
1.52
0.30
0.67
10.50
1.62
0.35
0.80
10.75
1.73
0.41
0.99
11.00
1.87
0.48
1.22
11.25
2.03
0.58
1.65
11.50
2.25
0.72
2.23
11.75
3.07
1.30
10.97
12.00
5.26
3.12
34.11
12.25
5.61
3.43
4.73
12.50
5.84
3.63
3.05
12.75
6.00
3.78
2.23
13.00
6.13
3.90
1.87
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
13.25
6.24
4.00
1.61
13.50
6.34
4.09
1.42
13.75
6.43
4.17
1.26
14.00
6.51
4.25
1.11
14.25
6.58
4.31
1.03
14.50
6.65
4.37
0.98
14.75
6.72
4.43
0.93
15.00
6.78
4.49
0.88
15.25
6.83
4.54
0.83
15.50
6.89
4.59
0.78
15.75
6.94
4.64
0.74
16.00
6.99
4.68
0.69
16.25
7.03
4.72
0.66
16.50
7.08
4.76
0.64
16.75
7.12
4.80
0.62
17.00
7.16
4.84
0.60
17.25
7.20
4.88
0.58
17.50
7.24
4.92
0.57
17.75
7.28
4.95
0.55
18.00
7.31
4.98
0.53
18.25
7.35
5.02
0.51
18.50
7.38
5.05
0.50
18.75
7.41
5.08
0.48
19.00
7.45
5.11
0.46
19.25
7.48
5.14
0.44
19.50
7.50
5.16
0.42
19.75
7.53
5.19
0.41
20.00
7.56
5.21
0.39
20.25
7.58
5.24
0.38
20.50
7.61
5.26
0.37
20.75
7.64
5.28
0.37
21.00
7.66
5.31
0.37
21.25
7.68
5.33
0.36
21.50
7.71
5.35
0.36
21.75
7.73
5.38
0.36
22.00
7.76
5.40
0.35
22.25
7.78
5.42
0.35
22.50
7.80
5.44
0.35
22.75
7.83
5.46
0.34
23.00
7.85
5.49
0.34
23.25
7.87
5.51
0.34
23.50
7.90
5.53
0.33
23.75
7.92
5.55
0.33
24.00
7.94
5.57
0.32

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 41
Summary for Reach 4R: (new Reach)
Inflow Area = 137.425 ac, 0.00% Impervious, Inflow Depth > 3.68" for 100 years - 24 hrs event
Inflow = 291.27 cfs @ 12.56 hrs, Volume= 42.101 of
Outflow = 291.27 cfs @ 12.56 hrs, Volume= 42.101 af, Atten= 0%, Lag= 0.0 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
300
250
N 200
0 150
FZ
100
50
0
0
Reach 4R: (new Reach)
Hydrograph
291.27 cfs
Inflow Area=137'A25 ac
L 4 0 0 lu IL 14 10 10 Lu LL L4
Time (hours)
— Inflow
— Outflow

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 42
Hydrograph for Reach 4R: (new Reach)
Time
Inflow Elevation
Outflow
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
0.25
0.00
0.00
0.50
0.00
0.00
0.75
0.00
0.00
1.00
0.00
0.00
1.25
0.00
0.00
1.50
0.00
0.00
1.75
0.00
0.00
2.00
0.00
0.00
2.25
0.00
0.00
2.50
0.00
0.00
2.75
0.00
0.00
3.00
0.00
0.00
3.25
0.00
0.00
3.50
0.00
0.00
3.75
0.00
0.00
4.00
0.00
0.00
4.25
0.00
0.00
4.50
0.00
0.00
4.75
0.00
0.00
5.00
0.00
0.00
5.25
0.00
0.00
5.50
0.00
0.00
5.75
0.00
0.00
6.00
0.00
0.00
6.25
0.00
0.00
6.50
0.00
0.00
6.75
0.00
0.00
7.00
0.00
0.00
7.25
0.00
0.00
7.50
0.00
0.00
7.75
0.00
0.00
8.00
0.00
0.00
8.25
0.00
0.00
8.50
0.00
0.00
8.75
0.00
0.00
9.00
0.00
0.00
9.25
0.03
0.03
9.50
0.22
0.22
9.75
0.63
0.63
10.00
1.24
1.24
10.25
2.04
2.04
10.50
3.10
3.10
10.75
4.51
4.51
11.00
6.42
6.42
11.25
9.05
9.05
11.50
12.89
12.89
11.75
20.01
20.01
12.00
55.10
55.10
12.25
181.62
181.62
12.50
288.72
288.72
12.75
258.55
258.55
13.00
174.73
174.73
Time
Inflow Elevation
Outflow
(hours)
(cfs) (feet)
(cfs)
13.25
120.05
120.05
13.50
86.47
86.47
13.75
65.99
65.99
14.00
53.07
53.07
14.25
44.31
44.31
14.50
38.15
38.15
14.75
33.63
33.63
15.00
30.49
30.49
15.25
28.49
28.49
15.50
26.84
26.84
15.75
25.34
25.34
16.00
23.90
23.90
16.25
22.49
22.49
16.50
21.17
21.17
16.75
20.08
20.08
17.00
19.26
19.26
17.25
18.61
18.61
17.50
18.04
18.04
17.75
17.51
17.51
18.00
16.99
16.99
18.25
16.49
16.49
18.50
15.98
15.98
18.75
15.47
15.47
19.00
14.96
14.96
19.25
14.45
14.45
19.50
13.94
13.94
19.75
13.43
13.43
20.00
12.92
12.92
20.25
12.41
12.41
20.50
11.93
11.93
20.75
11.55
11.55
21.00
11.29
11.29
21.25
11.11
11.11
21.50
10.97
10.97
21.75
10.85
10.85
22.00
10.75
10.75
22.25
10.65
10.65
22.50
10.55
10.55
22.75
10.46
10.46
23.00
10.36
10.36
23.25
10.26
10.26
23.50
10.16
10.16
23.75
10.06
10.06
24.00
9.96
9.96

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 43
Summary for Reach 5R: (new Reach)
Inflow Area = 143.717 ac, 31.58% Impervious, Inflow Depth > 4.92" for 100 years - 24 hrs event
Inflow = 422.40 cfs @ 12.53 hrs, Volume= 58.976 of
Outflow = 422.40 cfs @ 12.53 hrs, Volume= 58.976 af, Atten= 0%, Lag= 0.0 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
450
400
350
300
250
3
U_
200
150
100
50
0
Reach 5R: (new Reach)
Hydrograph
422.40 cfs
Inflow AreaL1431 M ac
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Inflow
— Outflow

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 44
Hydrograph for Reach 5R: (new Reach)
Time
Inflow Elevation
Outflow
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
0.25
0.00
0.00
0.50
0.00
0.00
0.75
0.00
0.00
1.00
0.00
0.00
1.25
0.00
0.00
1.50
0.00
0.00
1.75
0.00
0.00
2.00
0.00
0.00
2.25
0.00
0.00
2.50
0.00
0.00
2.75
0.00
0.00
3.00
0.00
0.00
3.25
0.00
0.00
3.50
0.00
0.00
3.75
0.00
0.00
4.00
0.00
0.00
4.25
0.00
0.00
4.50
0.00
0.00
4.75
0.00
0.00
5.00
0.00
0.00
5.25
0.00
0.00
5.50
0.00
0.00
5.75
0.00
0.00
6.00
0.00
0.00
6.25
0.00
0.00
6.50
0.00
0.00
6.75
0.06
0.06
7.00
0.25
0.25
7.25
0.58
0.58
7.50
1.01
1.01
7.75
1.49
1.49
8.00
2.01
2.01
8.25
2.56
2.56
8.50
3.17
3.17
8.75
3.92
3.92
9.00
4.86
4.86
9.25
5.99
5.99
9.50
7.24
7.24
9.75
8.44
8.44
10.00
9.62
9.62
10.25
11.12
11.12
10.50
13.16
13.16
10.75
15.89
15.89
11.00
19.47
19.47
11.25
24.26
24.26
11.50
31.04
31.04
11.75
43.36
43.36
12.00
102.10
102.10
12.25
289.37
289.37
12.50
421.04
421.04
12.75
355.54
355.54
13.00
230.80
230.80
Time
Inflow Elevation
Outflow
(hours)
(cfs) (feet)
(cfs)
13.25
154.70
154.70
13.50
109.40
109.40
13.75
82.30
82.30
14.00
65.52
65.52
14.25
54.35
54.35
14.50
46.56
46.56
14.75
40.80
40.80
15.00
37.11
37.11
15.25
34.66
34.66
15.50
32.60
32.60
15.75
30.74
30.74
16.00
28.96
28.96
16.25
27.22
27.22
16.50
25.59
25.59
16.75
24.26
24.26
17.00
23.24
23.24
17.25
22.42
22.42
17.50
21.71
21.71
17.75
21.06
21.06
18.00
20.43
20.43
18.25
19.81
19.81
18.50
19.18
19.18
18.75
18.55
18.55
19.00
17.92
17.92
19.25
17.30
17.30
19.50
16.67
16.67
19.75
16.05
16.05
20.00
15.43
15.43
20.25
14.80
14.80
20.50
14.21
14.21
20.75
13.75
13.75
21.00
13.45
13.45
21.25
13.24
13.24
21.50
13.08
13.08
21.75
12.94
12.94
22.00
12.81
12.81
22.25
12.67
12.67
22.50
12.54
12.54
22.75
12.42
12.42
23.00
12.30
12.30
23.25
12.18
12.18
23.50
12.06
12.06
23.75
11.94
11.94
24.00
11.81
11.81

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 45
Summary for Reach 6R: (new Reach)
Inflow Area = 389.489 ac, 11.65% Impervious, Inflow Depth > 4.14" for 100 years - 24 hrs event
Inflow = 966.40 cfs @ 12.49 hrs, Volume= 134.388 of
Outflow = 966.40 cfs @ 12.49 hrs, Volume= 134.388 af, Atten= 0%, Lag= 0.0 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
1,000
900
800
700
600
0 500
400
300
200
100
0
Reach 6R: (new Reach)
Hydrograph
966.40 cfs
nftow-J�rea=aN.499
�c
1
-1
-
k__ 4-
_t
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
Inflow
— Outflow

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 46
Hydrograph for Reach 6R: (new Reach)
Time
Inflow Elevation
Outflow
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
0.25
0.00
0.00
0.50
0.00
0.00
0.75
0.00
0.00
1.00
0.00
0.00
1.25
0.00
0.00
1.50
0.00
0.00
1.75
0.00
0.00
2.00
0.00
0.00
2.25
0.00
0.00
2.50
0.00
0.00
2.75
0.00
0.00
3.00
0.00
0.00
3.25
0.00
0.00
3.50
0.00
0.00
3.75
0.00
0.00
4.00
0.00
0.00
4.25
0.00
0.00
4.50
0.00
0.00
4.75
0.00
0.00
5.00
0.00
0.00
5.25
0.00
0.00
5.50
0.00
0.00
5.75
0.00
0.00
6.00
0.00
0.00
6.25
0.00
0.00
6.50
0.00
0.00
6.75
0.06
0.06
7.00
0.25
0.25
7.25
0.58
0.58
7.50
1.01
1.01
7.75
1.49
1.49
8.00
2.01
2.01
8.25
2.56
2.56
8.50
3.17
3.17
8.75
3.92
3.92
9.00
4.86
4.86
9.25
6.09
6.09
9.50
7.78
7.78
9.75
9.83
9.83
10.00
12.20
12.20
10.25
15.25
15.25
10.50
19.35
19.35
10.75
24.83
24.83
11.00
32.13
32.13
11.25
42.08
42.08
11.50
56.56
56.56
11.75
84.19
84.19
12.00
232.16
232.16
12.25
704.43
704.43
12.50
966.18
966.18
12.75
780.20
780.20
13.00
508.33
508.33
Time
Inflow Elevation
Outflow
(hours)
(cfs) (feet)
(cfs)
13.25
344.32
344.32
13.50
247.43
247.43
13.75
189.52
189.52
14.00
152.99
152.99
14.25
128.38
128.38
14.50
110.94
110.94
14.75
98.53
98.53
15.00
90.18
90.18
15.25
84.51
84.51
15.50
79.66
79.66
15.75
75.20
75.20
16.00
70.88
70.88
16.25
66.66
66.66
16.50
62.73
62.73
16.75
59.60
59.60
17.00
57.23
57.23
17.25
55.33
55.33
17.50
53.64
53.64
17.75
52.06
52.06
18.00
50.52
50.52
18.25
49.00
49.00
18.50
47.47
47.47
18.75
45.93
45.93
19.00
44.40
44.40
19.25
42.86
42.86
19.50
41.32
41.32
19.75
39.78
39.78
20.00
38.24
38.24
20.25
36.69
36.69
20.50
35.27
35.27
20.75
34.21
34.21
21.00
33.50
33.50
21.25
33.01
33.01
21.50
32.63
32.63
21.75
32.29
32.29
22.00
31.97
31.97
22.25
31.66
31.66
22.50
31.36
31.36
22.75
31.06
31.06
23.00
30.77
30.77
23.25
30.47
30.47
23.50
30.18
30.18
23.75
29.87
29.87
24.00
29.57
29.57

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 47
Summary for Reach 11 R: (new Reach)
Inflow Area = 8.354 ac, 0.00% Impervious, Inflow Depth > 5.54" for 100 years - 24 hrs event
Inflow = 46.77 cfs @ 12.16 hrs, Volume= 3.858 of
Outflow = 45.81 cfs @ 12.22 hrs, Volume= 3.846 af, Atten= 2%, Lag= 4.0 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 6.11 fps, Min. Travel Time= 2.3 min
Avg. Velocity = 1.78 fps, Avg. Travel Time= 7.8 min
Peak Storage= 6,275 cf @ 12.19 hrs
Average Depth at Peak Storage= 0.95'
Bank -Full Depth= 3.00' Flow Area= 36.0 sf, Capacity= 408.08 cfs
6.00' x 3.00' deep channel, n= 0.035 Earth, dense weeds
Side Slope Z-value= 2.0 7' Top Width= 18.00'
Length= 832.1' Slope= 0.0313 7'
Inlet Invert= 780.15', Outlet Invert= 754.11'
50
45
40
35
30
3 25
0
FL 20
15
10
5
0
Reach 11 R: (new Reach)
Hydrograph
45.81 cfs
Inflow Area=8.354 ac
Avg. Flow Depth=0.95}
Max Vet=6.11 fps
n=0.035
L=832.1'
S=0.0313 '/'
Capacity=408.08 cfs
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Inflow
— Outflow

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 48
Hydrograph for Reach 11 R: (new Reach)
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
780.15
0.00
0.50
0.00
0
780.15
0.00
1.00
0.00
0
780.15
0.00
1.50
0.00
0
780.15
0.00
2.00
0.00
0
780.15
0.00
2.50
0.00
0
780.15
0.00
3.00
0.00
0
780.15
0.00
3.50
0.00
0
780.15
0.00
4.00
0.00
0
780.15
0.00
4.50
0.00
0
780.15
0.00
5.00
0.00
0
780.15
0.00
5.50
0.02
7
780.15
0.00
6.00
0.08
50
780.16
0.04
6.50
0.14
115
780.17
0.10
7.00
0.21
180
780.19
0.18
7.50
0.28
221
780.19
0.25
8.00
0.36
262
780.20
0.33
8.50
0.47
312
780.21
0.42
9.00
0.65
381
780.22
0.59
9.50
0.83
455
780.24
0.79
10.00
1.02
510
780.25
0.95
10.50
1.42
626
780.27
1.30
11.00
2.10
799
780.30
1.92
11.50
3.52
1,096
780.36
3.13
12.00
29.53
4,104
780.82
19.71
12.50
16.32
3,353
780.72
20.99
13.00
5.33
1,562
780.44
6.04
13.50
3.50
1,167
780.37
3.71
14.00
2.71
989
780.34
2.84
14.50
2.22
867
780.31
2.29
15.00
1.99
809
780.30
2.04
15.50
1.78
756
780.29
1.83
16.00
1.57
698
780.28
1.62
16.50
1.41
649
780.27
1.43
17.00
1.32
625
780.27
1.34
17.50
1.25
602
780.27
1.27
18.00
1.17
578
780.26
1.19
18.50
1.10
554
780.26
1.11
19.00
1.02
530
780.25
1.04
19.50
0.94
506
780.25
0.96
20.00
0.87
482
780.24
0.88
20.50
0.81
461
780.24
0.82
21.00
0.79
453
780.24
0.80
21.50
0.78
447
780.24
0.78
22.00
0.76
441
780.24
0.77
22.50
0.75
435
780.23
0.75
23.00
0.73
429
780.23
0.73
23.50
0.72
424
780.23
0.72
24.00
0.70
418
780.23
0.70

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 49
Summary for Reach 15R: (new Reach)
Inflow Area = 3.921 ac, 0.00% Impervious, Inflow Depth > 5.56" for 100 years - 24 hrs event
Inflow = 36.06 cfs @ 11.97 hrs, Volume= 1.818 of
Outflow = 34.72 cfs @ 11.99 hrs, Volume= 1.815 af, Atten= 4%, Lag= 1.6 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 7.72 fps, Min. Travel Time= 1.0 min
Avg. Velocity = 1.84 fps, Avg. Travel Time= 4.3 min
Peak Storage= 2,210 cf @ 11.98 hrs
Average Depth at Peak Storage= 0.64'
Bank -Full Depth= 3.00' Flow Area= 36.0 sf, Capacity= 650.15 cfs
6.00' x 3.00' deep channel, n= 0.035
Side Slope Z-value= 2.0 7' Top Width= 18.00'
Length= 477.0' Slope= 0.0794 7'
Inlet Invert= 792.00', Outlet Invert= 754.11'
40
35
30=
0 25
3 20
0
" 15
10
5
Reach 15R: (new Reach)
Hydrograph
34.72 cfs
Inflow Area=3.921 ac
Avg. Flow Depth=0.64'
Max Vet=7.72 fps
n=0.035
L=477.0'
S=0.0794 '/'
Capacity=650.15 cfs
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Inflow
— Outflow

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 50
Hydrograph for Reach 15R: (new Reach)
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
792.00
0.00
0.50
0.00
0
792.00
0.00
1.00
0.00
0
792.00
0.00
1.50
0.00
0
792.00
0.00
2.00
0.00
0
792.00
0.00
2.50
0.00
0
792.00
0.00
3.00
0.00
0
792.00
0.00
3.50
0.00
0
792.00
0.00
4.00
0.00
0
792.00
0.00
4.50
0.00
0
792.00
0.00
5.00
0.00
0
792.00
0.00
5.50
0.02
7
792.00
0.01
6.00
0.05
18
792.01
0.04
6.50
0.08
31
792.01
0.07
7.00
0.12
45
792.02
0.11
7.50
0.15
59
792.02
0.14
8.00
0.19
75
792.03
0.18
8.50
0.26
95
792.03
0.25
9.00
0.36
114
792.04
0.34
9.50
0.42
126
792.04
0.41
10.00
0.56
151
792.05
0.53
10.50
0.80
192
792.07
0.77
11.00
1.22
248
792.08
1.17
11.50
2.23
361
792.12
2.11
12.00
34.11
2,177
792.63
34.67
12.50
3.05
462
792.15
3.31
13.00
1.87
335
792.11
1.94
13.50
1.42
281
792.10
1.46
14.00
1.11
242
792.08
1.15
14.50
0.98
221
792.08
0.99
15.00
0.88
207
792.07
0.90
15.50
0.78
193
792.07
0.80
16.00
0.69
179
792.06
0.70
16.50
0.64
171
792.06
0.64
17.00
0.60
164
792.06
0.61
17.50
0.57
157
792.05
0.57
18.00
0.53
150
792.05
0.54
18.50
0.50
143
792.05
0.50
19.00
0.46
136
792.05
0.46
19.50
0.42
129
792.04
0.43
20.00
0.39
122
792.04
0.39
20.50
0.37
119
792.04
0.38
21.00
0.37
118
792.04
0.37
21.50
0.36
116
792.04
0.36
22.00
0.35
115
792.04
0.35
22.50
0.35
114
792.04
0.35
23.00
0.34
112
792.04
0.34
23.50
0.33
111
792.04
0.33
24.00
0.32
110
792.04
0.33

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 51
Summary for Reach 27R: Spillway Outfall
Inflow Area = 858.060 ac, 5.29% Impervious, Inflow Depth > 4.12" for 100 years - 24 hrs event
Inflow = 687.83 cfs @ 13.86 hrs, Volume= 294.699 of
Outflow = 687.72 cfs @ 13.94 hrs, Volume= 294.092 af, Atten= 0%, Lag= 4.6 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 8.74 fps, Min. Travel Time= 2.6 min
Avg. Velocity = 5.90 fps, Avg. Travel Time= 3.8 min
Peak Storage= 105,400 cf @ 13.90 hrs
Average Depth at Peak Storage= 3.23'
Bank -Full Depth= 94.66' Flow Area= 78,667.2 sf, Capacity= 6,461,392.31 cfs
Custom cross-section, Length= 1,338.8' Slope= 0.0303 T (112 Elevation Intervals)
Constant n= 0.040
Inlet Invert= 656.55', Outlet Invert= 615.97'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
74.42
700.66
0.00
168.56
695.66
5.00
283.63
671.68
28.98
442.63
620.00
80.66
514.29
610.00
90.66
733.65
611.99
88.67
754.40
606.24
94.42
764.63
606.00
94.66
771.19
608.00
92.66
843.45
612.00
88.66
1,316.83
682.00
18.66
1,444.58
690.00
10.66
1,552.47
688.51
12.15
1,647.76
678.00
22.66
1,658.48
678.00
22.66
1,792.16
700.66
0.00

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 52
Depth
(feet)
End Area
(sq-ft)
Perim.
(feet)
Storage Discharge
(cubic -feet) (cfs)
0.00
0.0
0.0
0 0.00
0.24
1.3
11.1
1,770 2.08
2.00
31.4
23.7
42,014 244.87
4.00
121.0
67.4
162,010 1,156.69
5.99
528.7
344.6
707,812 4,548.84
6.00
532.1
344.8
712,409 4,595.93
14.00
3,725.8
457.4
4,988,068 97,555.18
65.68
40,375.4
977.9
54,054,6443,119,567.13
72.00
46,695.1
1,062.8
62,515,3823,760,494.23
76.00
51,096.1
1,170.2
68,407,4474,098,013.65
82.51
59,361.3
1,404.6
79,472,9081,658,383.64
84.00
61,536.3
1,552.5
82,384,8164,626,837.94
89.66
70,387.6
1,614.1
94,234,8915,640,154.10
94.66
78,667.2
1,738.3
105,319,63C6,461,392.31
700
600
500
3 400
FL 300
200
100
0
0
Reach 27R: Spillway Outfall
Hydrograph
687.72 cfs
Inflow Arlea=8�8.066 ac
Avg. Flow Depth=3�23' -T
Max Vet=8.74 fps
n="40H
L=1,338.�
S=0.0303 T
Capacijy4 461 3k.31 cts
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
- Inflow
- Outflow

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 53
Hydrograph for Reach 27R: Spillway Outfall
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
656.55
0.00
0.50
0.00
0
656.55
0.00
1.00
0.00
0
656.55
0.00
1.50
0.00
0
656.55
0.00
2.00
0.00
0
656.55
0.00
2.50
0.00
0
656.55
0.00
3.00
0.00
0
656.55
0.00
3.50
0.00
0
656.55
0.00
4.00
0.00
0
656.55
0.00
4.50
0.00
0
656.55
0.00
5.00
0.00
0
656.55
0.00
5.50
0.00
0
656.55
0.00
6.00
0.00
0
656.55
0.00
6.50
0.00
0
656.55
0.00
7.00
0.06
21
656.55
0.02
7.50
0.44
213
656.58
0.22
8.00
1.26
734
656.65
0.79
8.50
2.69
1,707
656.78
1.88
9.00
4.94
2,387
656.82
4.36
9.50
9.72
3,454
656.88
8.42
10.00
19.82
5,766
657.01
17.33
10.50
33.12
8,905
657.19
29.74
11.00
56.45
14,194
657.48
50.05
11.50
99.74
20,538
657.73
89.92
12.00
422.21
58,589
658.93
288.42
12.50
598.60
95,071
659.63
613.68
13.00
631.46
97,765
659.67
621.15
13.50
678.32
103,960
659.76
673.55
14.00
686.26
105,289
659.78
687.41
14.50
649.92
101,122
659.72
658.01
15.00
588.30
93,526
659.61
598.66
15.50
514.15
84,338
659.48
526.35
16.00
414.86
71,246
659.23
439.00
16.50
266.49
47,981
658.69
295.52
17.00
157.45
30,096
658.11
162.67
17.50
143.06
27,746
658.01
144.75
18.00
134.47
26,461
657.96
135.82
18.50
126.61
25,302
657.92
127.91
19.00
118.73
24,154
657.87
120.14
19.50
109.19
22,770
657.82
110.86
20.00
98.50
21,213
657.76
100.36
20.50
86.56
19,466
657.69
88.55
21.00
77.96
18,134
657.64
79.00
21.50
73.84
17,492
657.61
74.35
22.00
71.64
17,153
657.60
71.94
22.50
70.06
16,917
657.59
70.31
23.00
68.66
16,711
657.58
68.89
23.50
67.32
16,512
657.58
67.54
24.00
65.98
16,316
657.57
66.20

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 54
Summary for Reach 28R: Road Culvert
Inflow Area = 925.024 ac, 4.91 % Impervious, Inflow Depth > 4.08" for 100 years - 24 hrs event
Inflow = 854.99 cfs @ 12.26 hrs, Volume= 314.785 of
Outflow = 753.37 cfs @ 12.57 hrs, Volume= 312.719 af, Atten= 12%, Lag= 18.7 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 5.78 fps, Min. Travel Time= 7.2 min
Avg. Velocity = 3.41 fps, Avg. Travel Time= 12.3 min
Peak Storage= 431,752 cf @ 12.45 hrs
Average Depth at Peak Storage= 3.08'
Bank -Full Depth= 39.37' Flow Area= 11,690.1 sf, Capacity= 402,588.09 cfs
Custom cross-section, Length= 2,511.7' Slope= 0.0111 T (109 Elevation Intervals)
Constant n= 0.040
Inlet Invert= 615.97', Outlet Invert= 588.00'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
16.74
629.37
0.00
46.74
623.76
5.61
73.81
616.00
13.37
87.73
610.00
19.37
95.22
604.48
24.89
103.27
590.00
39.37
137.81
590.00
39.37
140.51
592.00
37.37
332.24
594.00
35.37
348.56
596.04
33.33
362.15
598.63
30.74
410.71
616.00
13.37
420.31
622.00
7.37
445.73
629.37
0.00

Post Closure -Dam Breach_100 ft Breach Type 1124-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 55
Depth
(feet)
End Area
(sq-ft)
Perim.
(feet)
Storage
(cubic -feet)
Discharge
(cfs)
0.00
0.0
34.5
0
0.00
2.00
72.9
40.2
183,083
425.00
4.00
342.4
234.2
860,100
1,729.33
6.04
831.9
253.0
2,089,423
7,211.20
8.63
1,495.3
269.8
3,755,840
18,359.59
14.48
3,095.2
293.9
7,774,219
58,305.65
20.00
4,722.2
319.6
11,860,740
111,480.77
26.00
6,651.5
352.5
16,706,610
184,811.49
32.00
8,764.5
385.6
22,013,810
275,694.39
33.76
9,421.9
398.3
23,665,058
304,365.07
39.37
11,690.1
449.0
29,362,117
402,588.09
•le
�-0111(
700
N 600
500
3
�° 400
300
200
1001 0
0
Reach 28R: Road Culvert
Hydrograph
854.99 cfs
Inflow-Area=925.024 a 753.37 cfs
Avg. Flow Depth733.08'
Ma Vet=5.7$ fps
n .040
L=2,511 J' - - - - - I-
S=0.0111
p='/' 02,58809C acity4cfs
2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
- Inflow
- Outflow

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 56
Hydrograph for Reach 28R: Road Culvert
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
615.97
0.00
0.50
0.00
0
615.97
0.00
1.00
0.00
0
615.97
0.00
1.50
0.00
0
615.97
0.00
2.00
0.00
0
615.97
0.00
2.50
0.00
0
615.97
0.00
3.00
0.00
0
615.97
0.00
3.50
0.00
0
615.97
0.00
4.00
0.00
0
615.97
0.00
4.50
0.00
0
615.97
0.00
5.00
0.00
0
615.97
0.00
5.50
0.00
0
615.97
0.00
6.00
0.00
0
615.97
0.00
6.50
0.00
0
615.97
0.00
7.00
0.02
6
615.97
0.00
7.50
0.22
111
615.97
0.05
8.00
0.79
528
615.98
0.32
8.50
1.88
1,447
615.99
0.97
9.00
4.37
3,546
616.01
2.44
9.50
8.87
7,204
616.05
5.00
10.00
18.61
15,039
616.14
10.37
10.50
32.44
28,500
616.29
20.52
11.00
55.37
44,713
616.48
39.86
11.50
101.15
66,667
616.72
73.62
12.00
435.05
147,165
617.59
178.08
12.50
719.24
428,539
619.04
741.77
13.00
658.25
380,720
618.90
663.68
13.50
696.79
396,143
618.94
679.17
14.00
705.14
405,371
618.97
703.41
14.50
672.63
394,872
618.94
693.87
15.00
611.77
365,897
618.85
645.38
15.50
538.13
328,714
618.74
578.57
16.00
449.43
278,118
618.52
505.46
16.50
304.88
168,709
617.82
422.72
17.00
171.47
107,875
617.17
204.41
17.50
153.07
97,057
617.06
159.84
18.00
143.66
92,724
617.01
147.92
18.50
135.26
89,183
616.97
139.19
19.00
127.00
85,772
616.93
130.94
19.50
117.21
81,880
616.89
121.97
20.00
106.21
77,432
616.84
111.51
20.50
94.02
72,483
616.79
99.86
21.00
84.34
67,748
616.73
88.76
21.50
79.60
64,393
616.70
82.02
22.00
77.10
62,629
616.68
78.42
22.50
75.36
61,527
616.67
76.31
23.00
73.85
60,633
616.66
74.69
23.50
72.40
59,797
616.65
73.21
24.00
70.97
58,977
616.64
71.77

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 57
Summary for Reach 29R: RR Culvert
Inflow Area = 933.214 ac, 4.86% Impervious, Inflow Depth > 4.05" for 100 years - 24 hrs event
Inflow = 758.81 cfs @ 12.57 hrs, Volume= 315.259 of
Outflow = 757.55 cfs @ 12.58 hrs, Volume= 315.134 af, Atten= 0%, Lag= 0.7 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 9.75 fps, Min. Travel Time= 0.4 min
Avg. Velocity = 5.71 fps, Avg. Travel Time= 0.7 min
Peak Storage= 18,860 cf @ 12.57 hrs
Average Depth at Peak Storage= 4.60'
Bank -Full Depth= 27.36' Flow Area= 3,723.4 sf, Capacity= 91,794.33 cfs
Custom cross-section, Length= 242.5' Slope= 0.0165 T (104 Elevation Intervals)
Constant n= 0.040
Inlet Invert= 584.00', Outlet Invert= 580.00'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
34.01
607.36
0.00
66.97
600.00
7.36
118.99
600.00
7.36
176.43
590.00
17.36
213.63
588.00
19.36
228.46
580.00
27.36
238.68
580.00
27.36
244.95
585.91
21.45
342.59
607.36
0.00
Depth End
Area Perim.
Storage
Discharge
(feet)
(sq-ft) (feet)
(cubic -feet)
(cfs)
0.00
0.0 10.2
0
0.00
5.91
111.3 31.3
26,991
1,237.62
8.00
182.7 45.4
44,294
2,203.63
10.00
310.6 92.0
75,327
3,335.52
20.00 1,696.8
248.9
411,474
29,104.81
27.36 3,723.4
317.0
902,916
91,794.33

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 58
Reach 29R: RR Culvert
Hydrograph
0 500
3 400
0
U_
300
200
100
0
757.55 cfs
1 nfao"rea=9331.214lac
Avg. F16w Depth=4.6I0'
Max Ve'=9.75 fps
n=4.0
L=242. ' _
S=0.01 65 '/' I
Capadi y=_91 �9�33 ¢fs 1-
T 7 T
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
Inflow
— Outflow

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 59
Hydrograph for Reach 29R: RR Culvert
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
584.00
0.00
0.50
0.00
0
584.00
0.00
1.00
0.00
0
584.00
0.00
1.50
0.00
0
584.00
0.00
2.00
0.00
0
584.00
0.00
2.50
0.00
0
584.00
0.00
3.00
0.00
0
584.00
0.00
3.50
0.00
0
584.00
0.00
4.00
0.00
0
584.00
0.00
4.50
0.00
0
584.00
0.00
5.00
0.00
0
584.00
0.00
5.50
0.00
0
584.00
0.00
6.00
0.00
0
584.00
0.00
6.50
0.00
0
584.00
0.00
7.00
0.00
0
584.00
0.00
7.50
0.05
6
584.00
0.04
8.00
0.32
37
584.01
0.29
8.50
0.97
114
584.04
0.90
9.00
2.44
288
584.11
2.27
9.50
5.09
605
584.24
4.80
10.00
10.57
990
584.38
10.20
10.50
20.94
1,582
584.59
20.45
11.00
40.68
2,442
584.87
39.74
11.50
75.41
3,690
585.26
73.99
12.00
216.68
7,548
586.29
206.41
12.50
748.07
18,627
588.55
741.96
13.00
667.02
17,179
588.30
668.33
13.50
681.67
17,438
588.34
680.80
14.00
705.38
17,881
588.42
705.14
14.50
695.57
17,710
588.39
696.29
15.00
646.93
16,803
588.23
648.37
15.50
579.95
15,527
587.99
581.74
16.00
506.67
14,087
587.71
508.65
16.50
423.83
12,371
587.37
423.51
17.00
205.47
7,446
586.27
208.85
17.50
160.83
6,253
585.97
161.34
18.00
148.85
5,926
585.88
149.13
18.50
140.06
5,677
585.82
140.31
19.00
131.75
5,442
585.75
131.99
19.50
122.72
5,188
585.69
123.01
20.00
112.21
4,881
585.60
112.55
20.50
100.52
4,524
585.50
100.90
21.00
89.40
4,182
585.40
89.66
21.50
82.66
3,966
585.34
82.82
22.00
79.05
3,842
585.31
79.13
22.50
76.92
3,770
585.28
76.98
23.00
75.29
3,715
585.27
75.34
23.50
73.80
3,664
585.25
73.85
24.00
72.35
3,615
585.24
72.40

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 60
Summary for Reach 30R: To Dan River
Inflow Area = 938.212 ac, 4.84% Impervious, Inflow Depth > 4.05" for 100 years - 24 hrs event
Inflow = 761.23 cfs @ 12.58 hrs, Volume= 316.683 of
Outflow = 760.40 cfs @ 12.60 hrs, Volume= 316.500 af, Atten= 0%, Lag= 1.4 min
Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Max. Velocity= 6.63 fps, Min. Travel Time= 0.6 min
Avg. Velocity = 4.00 fps, Avg. Travel Time= 1.1 min
Peak Storage= 29,646 cf @ 12.59 hrs
Average Depth at Peak Storage= 3.17'
Bank -Full Depth= 10.54' Flow Area= 1,563.4 sf, Capacity= 19,048.17 cfs
Custom cross-section, Length= 258.3' Slope= 0.0157 T (103 Elevation Intervals)
Constant n= 0.040
Inlet Invert= 583.01', Outlet Invert= 578.96'
Offset Elevation Chan.Depth
(feet)
(feet)
(feet)
43.40
593.14
0.00
226.12
588.00
5.14
252.69
586.00
7.14
285.16
582.83
10.31
293.21
582.60
10.54
342.47
588.00
5.14
411.43
593.14
0.00
Depth End Area Perim.
Storage
Discharge
(feet)
(sq-ft) (feet)
(cubic -feet)
(cfs)
0.00
0.0 0.0
0
0.00
0.23
1.2 10.2
301
1.28
3.40
130.6 71.9
33,743
905.02
5.40
318.5 116.9
82,274
2,890.90
10.54 1,563.4
368.8
403,820
19,048.17

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 61
Reach 30R: To Dan River
Hydrograph
0
.l1c
0 500
0 400
U_
300
200
100
0
760.40 cfs
I nflo"rea=9381.212lac
Avg. Flbw Depth=3.117'
Max Ve'=6.f3 fps
n=0~.0
L=258. '
S=0.01 �7 '/' I
Capacity_19,AY4"7 ¢fs I-
T 7 T
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
Inflow
— Outflow

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 62
Hydrograph for Reach 30R: To Dan River
Time
Inflow
Storage
Elevation
Outflow
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
583.01
0.00
0.50
0.00
0
583.01
0.00
1.00
0.00
0
583.01
0.00
1.50
0.00
0
583.01
0.00
2.00
0.00
0
583.01
0.00
2.50
0.00
0
583.01
0.00
3.00
0.00
0
583.01
0.00
3.50
0.00
0
583.01
0.00
4.00
0.00
0
583.01
0.00
4.50
0.00
0
583.01
0.00
5.00
0.00
0
583.01
0.00
5.50
0.00
0
583.01
0.00
6.00
0.00
0
583.01
0.00
6.50
0.00
0
583.01
0.00
7.00
0.00
0
583.01
0.00
7.50
0.04
11
583.03
0.03
8.00
0.29
81
583.13
0.23
8.50
0.90
205
583.19
0.78
9.00
2.28
415
583.28
2.09
9.50
4.85
709
583.38
4.58
10.00
10.32
1,217
583.52
9.79
10.50
20.70
2,023
583.70
19.95
11.00
40.22
3,283
583.93
38.67
11.50
75.03
5,218
584.21
72.84
12.00
226.48
11,636
584.91
209.44
12.50
746.38
29,092
586.15
734.47
13.00
670.42
26,985
586.02
672.77
13.50
682.36
27,299
586.04
681.00
14.00
706.36
28,027
586.09
705.95
14.50
697.33
27,780
586.07
698.42
15.00
649.31
26,351
585.99
651.58
15.50
582.59
24,314
585.86
585.40
16.00
509.39
22,000
585.71
512.51
16.50
424.19
19,140
585.51
423.89
17.00
209.50
11,432
584.89
215.34
17.50
161.95
9,367
584.69
162.81
18.00
149.71
8,825
584.63
150.15
18.50
140.85
8,437
584.59
141.24
19.00
132.49
8,060
584.55
132.88
19.50
123.48
7,653
584.51
123.94
20.00
112.97
7,167
584.45
113.50
20.50
101.31
6,616
584.39
101.89
21.00
90.05
6,058
584.32
90.46
21.50
83.21
5,715
584.28
83.47
22.00
79.52
5,521
584.25
79.66
22.50
77.36
5,407
584.24
77.45
23.00
75.71
5,321
584.23
75.79
23.50
74.21
5,243
584.22
74.28
24.00
72.75
5,167
584.21
72.82

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 63
Summary for Pond 1 P: Detention Basin
Inflow Area = 454.237 ac, 9.99% Impervious, Inflow Depth > 4.07" for 100 years - 24 hrs event
Inflow =
1,104.03 cfs @
12.50 hrs,
Volume=
154.229 of
Outflow =
645.05 cfs @
12.95 hrs,
Volume=
154.199 af, Atten= 42%, Lag= 27.1 min
Primary =
645.05 cfs @
12.95 hrs,
Volume=
154.199 of
Secondary =
0.00 cfs @
0.00 hrs,
Volume=
0.000 of
Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Peak Elev= 671.58' @ 12.95 hrs Surf.Area= 4.391 ac Storage= 25.851 of
Plug -Flow detention time= 12.7 min calculated for 153.878 of (100% of inflow)
Center -of -Mass det. time= 12.6 min ( 871.5 - 858.9 )
Volume
Invert Avail.Storage
Storage Description
#1
655.00'
43.452 of
Custom Stage
Data (Irregular)Listed below (Recalc)
Elevation
Surf.Area
Perim.
Inc.Store
Cum.Store
Wet.Area
(feet)
(acres)
(feet)
(acre-feet)
(acre-feet)
(acres)
655.00
0.004
61.6
0.000
0.000
0.004
660.00
0.704
1,205.2
1.268
1.268
2.652
665.00
1.511
1,572.8
5.411
6.679
4.524
670.00
3.750
3,336.7
12.736
19.415
20.347
675.00
5.949
4,172.6
24.037
43.452
31.822
Device Routing Invert Outlet Devices
#1 Secondary 674.00' 100.0' long x 10.0' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
#2 Primary 654.68' 72.0" W x 72.0" H Box Culvert
L= 144.1' RCP, sq.cut end projecting, Ke= 0.500
Inlet / Outlet Invert= 654.68' / 649.35' S= 0.0370 '/' Cc= 0.900
n= 0.013, Flow Area= 36.00 sf
Primary OutFlow Max=645.05 cfs @ 12.95 hrs HW=671.58' (Free Discharge)
L2=Culvert (Inlet Controls 645.05 cfs @ 17.92 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=655.00' (Free Discharge)
1=Broad-Crested Rectangular Weir( Controls 0.00 cfs)

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 64
Pond 1 P: Detention Basin
Hydrograph
1,200
-
1,100
Inf�w74re�=45.2
T
1,000
Tc
900
PeAk gev�71.58'
L800
StgrT-iag=2�.851 I of
+
� 1
N
700
645.05 cfs
v
1
3 600
—
— — —
500
L 1- 1 L
L
L
L 1
,°
400
t t_f
L
t
d 1
300
200
000
f
. cs
0
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
Inflow
Outflow
— Primary
Secondary

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 65
Hydrograph for Pond 1 P: Detention Basin
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(acre-feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0.000
655.00
0.00
0.00
0.00
0.50
0.00
0.000
655.00
0.00
0.00
0.00
1.00
0.00
0.000
655.00
0.00
0.00
0.00
1.50
0.00
0.000
655.00
0.00
0.00
0.00
2.00
0.00
0.000
655.00
0.00
0.00
0.00
2.50
0.00
0.000
655.00
0.00
0.00
0.00
3.00
0.00
0.000
655.00
0.00
0.00
0.00
3.50
0.00
0.000
655.00
0.00
0.00
0.00
4.00
0.00
0.000
655.00
0.00
0.00
0.00
4.50
0.00
0.000
655.00
0.00
0.00
0.00
5.00
0.00
0.000
655.00
0.00
0.00
0.00
5.50
0.00
0.000
655.00
0.00
0.00
0.00
6.00
0.00
0.000
655.00
0.00
0.00
0.00
6.50
0.00
0.000
655.00
0.00
0.00
0.00
7.00
0.25
0.000
655.01
0.25
0.25
0.00
7.50
1.01
0.000
655.03
1.00
1.00
0.00
8.00
2.01
0.000
655.06
2.01
2.01
0.00
8.50
3.17
0.001
655.09
3.16
3.16
0.00
9.00
4.86
0.001
655.13
4.85
4.85
0.00
9.50
7.88
0.002
655.23
7.83
7.83
0.00
10.00
12.80
0.004
655.44
12.69
12.69
0.00
10.50
20.84
0.011
655.72
20.59
20.59
0.00
11.00
35.21
0.030
656.15
34.49
34.49
0.00
11.50
62.74
0.088
656.82
60.26
60.26
0.00
12.00
259.26
0.781
659.19
184.65
184.65
0.00
12.50
1,104.02
15.089
668.73
574.46
574.46
0.00
13.00
589.14
25.732
671.56
644.41
644.41
0.00
13.50
287.39
17.006
669.32
589.83
589.83
0.00
14.00
177.65
4.778
663.62
417.90
417.90
0.00
14.50
128.71
0.458
658.44
140.57
140.57
0.00
15.00
104.49
0.266
657.81
106.54
106.54
0.00
15.50
92.27
0.206
657.54
93.38
93.38
0.00
16.00
82.10
0.164
657.33
83.03
83.03
0.00
16.50
72.67
0.129
657.12
73.38
73.38
0.00
17.00
66.29
0.107
656.97
66.65
66.65
0.00
17.50
62.11
0.095
656.87
62.40
62.40
0.00
18.00
58.50
0.084
656.78
58.72
58.72
0.00
18.50
54.98
0.075
656.70
55.20
55.20
0.00
19.00
51.43
0.066
656.61
51.67
51.67
0.00
19.50
47.88
0.057
656.52
48.08
48.08
0.00
20.00
44.32
0.049
656.43
44.50
44.50
0.00
20.50
40.88
0.042
656.33
41.01
41.01
0.00
21.00
38.81
0.038
656.28
38.88
38.88
0.00
21.50
37.80
0.036
656.25
37.83
37.83
0.00
22.00
37.04
0.035
656.23
37.07
37.07
0.00
22.50
36.33
0.033
656.21
36.36
36.36
0.00
23.00
35.65
0.032
656.19
35.67
35.67
0.00
23.50
34.97
0.031
656.17
34.98
34.98
0.00
24.00
34.26
0.030
656.15
34.29
34.29
0.00

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 66
Summary for Pond 5P: Retention Basin
Inflow Area = 755.720 ac, 6.01 % Impervious, Inflow Depth > 4.20" for 100 years - 24 hrs event
Inflow = 1,127.06 cfs @ 12.89 hrs, Volume= 264.482 of
Outflow = 659.86 cfs @ 13.94 hrs, Volume= 263.061 af, Atten= 41 %, Lag= 63.1 min
Primary = 659.86 cfs @ 13.94 hrs, Volume= 263.061 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Starting Elev= 644.00' Surf.Area= 1.675 ac Storage= 10.362 of
Peak Elev= 663.56' @ 13.94 hrs Surf.Area= 4.384 ac Storage= 70.769 of (60.408 of above start)
Plug -Flow detention time= 68.4 min calculated for 252.699 of (96% of inflow)
Center -of -Mass det. time= 34.8 min ( 914.8 - 880.0 )
Volume Invert Avail.Storage Storage Description
#1 631.00' 77.215 of Custom Stage Data (Irregular)Listed below (Recalc)
Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area
(feet) (acres) (feet) (acre-feet) (acre-feet) (acres)
631.00 0.084 283.2 0.000 0.000 0.084
635.00 0.480 612.9 1.020 1.020 0.625
640.00 1.097 1,000.4 3.838 4.857 1.771
645.00 1.839 1,395.1 7.261 12.118 3.504
650.00 2.672 1,754.5 11.213 23.331 5.580
655.00 3.259 1,857.6 14.803 38.134 6.291
660.00 3.903 2,037.4 17.881 56.015 7.590
665.00 4.586 2,194.1 21.200 77.215 8.825
Device Routing Invert Outlet Devices
#1 Secondary 665.00' 100.0' long x 10.0' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
#2 Device 3 644.00' 72.0" x 72.0" Horiz. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#3 Primary 637.07' 72.0" Round Culvert
L= 161.6' RCP, sq.cut end projecting, Ke= 0.500
Inlet / Outlet Invert= 637.07' / 635.46' S= 0.0100 '/' Cc= 0.900
n= 0.013, Flow Area= 28.27 sf
Primary OutFlow Max=659.83 cfs @ 13.94 hrs HW=663.56' (Free Discharge)
LtCulvert (Inlet Controls 659.83 cfs @ 23.34 fps)
2=Orifice/Grate (Passes 659.83 cfs of 766.62 cfs potential flow)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=644.00' (Free Discharge)
L1=Broad-Crested Rectangular Weir( Controls 0.00 cfs)

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 67
Pond 5P: Retention Basin
Hydrograph
1,200
1,127.06 cfs
- Inflow
1,100
I46"re�=75 ac
Outflow
1,000
.72d
peak E�ev=§63.�6' I I I I
I
I
I I —Primary
- Secondary
900
t r800 ag =7� 70 af-
N
659.86 cfs
v 700
���I
TT
M 500
— —
400Lcfs
T
1
300
T T 1
T
T
1
200
0.0
0
0
2 4 6 8 10 12 14 16
18
20
22 24
Time (hours)

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 68
Hydrograph for Pond 5P: Retention Basin
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(acre-feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
10.362
644.00
0.00
0.00
0.00
0.50
0.00
10.362
644.00
0.00
0.00
0.00
1.00
0.00
10.362
644.00
0.00
0.00
0.00
1.50
0.00
10.362
644.00
0.00
0.00
0.00
2.00
0.00
10.362
644.00
0.00
0.00
0.00
2.50
0.00
10.362
644.00
0.00
0.00
0.00
3.00
0.00
10.362
644.00
0.00
0.00
0.00
3.50
0.00
10.362
644.00
0.00
0.00
0.00
4.00
0.00
10.362
644.00
0.00
0.00
0.00
4.50
0.00
10.362
644.00
0.00
0.00
0.00
5.00
0.00
10.362
644.00
0.00
0.00
0.00
5.50
0.00
10.362
644.00
0.00
0.00
0.00
6.00
0.00
10.362
644.00
0.00
0.00
0.00
6.50
0.00
10.362
644.00
0.00
0.00
0.00
7.00
0.25
10.364
644.00
0.06
0.06
0.00
7.50
1.03
10.380
644.01
0.44
0.44
0.00
8.00
2.39
10.415
644.03
1.26
1.26
0.00
8.50
4.52
10.476
644.07
2.69
2.69
0.00
9.00
7.78
10.571
644.12
4.93
4.93
0.00
9.50
14.35
10.743
644.22
8.99
8.99
0.00
10.00
23.15
10.971
644.36
17.82
17.82
0.00
10.50
36.29
11.223
644.50
28.90
28.90
0.00
11.00
58.79
11.600
644.71
48.16
48.16
0.00
11.50
100.13
12.173
645.03
82.22
82.22
0.00
12.00
297.71
13.756
645.86
199.48
199.48
0.00
12.50
936.98
26.106
651.02
450.42
450.42
0.00
13.00
1,117.40
49.132
658.18
579.35
579.35
0.00
13.50
902.14
65.950
662.44
643.95
643.95
0.00
14.00
617.13
70.666
663.54
659.52
659.52
0.00
14.50
282.02
61.350
661.34
627.81
627.81
0.00
15.00
217.31
46.673
657.50
568.38
568.38
0.00
15.50
187.43
32.946
653.36
496.24
496.24
0.00
16.00
166.71
21.506
649.30
399.02
399.02
0.00
16.50
148.70
14.486
646.22
252.28
252.28
0.00
17.00
136.12
13.048
645.49
144.04
144.04
0.00
17.50
127.47
12.864
645.40
130.37
130.37
0.00
18.00
120.15
12.758
645.34
122.52
122.52
0.00
18.50
113.13
12.663
645.29
115.41
115.41
0.00
19.00
105.42
12.560
645.24
108.29
108.29
0.00
19.50
96.16
12.430
645.17
99.52
99.52
0.00
20.00
85.82
12.283
645.09
89.60
89.60
0.00
20.50
74.12
12.114
645.00
78.22
78.22
0.00
21.00
67.44
11.978
644.92
69.80
69.80
0.00
21.50
64.69
11.909
644.88
65.83
65.83
0.00
22.00
63.07
11.873
644.86
63.77
63.77
0.00
22.50
61.78
11.848
644.85
62.34
62.34
0.00
23.00
60.57
11.826
644.84
61.09
61.09
0.00
23.50
59.40
11.805
644.83
59.89
59.89
0.00
24.00
58.21
11.784
644.82
58.70
58.70
0.00

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 69
Summary for Pond 17P: NE Landfill Corner
Inflow Area = 12.275 ac, 0.00% Impervious, Inflow Depth > 5.53" for 100 years - 24 hrs event
Inflow = 55.61 cfs @ 12.04 hrs, Volume= 5.661 of
Outflow = 56.48 cfs @ 12.04 hrs, Volume= 5.552 af, Atten= 0%, Lag= 0.3 min
Primary = 56.48 cfs @ 12.04 hrs, Volume= 5.552 of
Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Peak Elev= 758.35' @ 12.04 hrs Surf.Area= 3,741 sf Storage= 4,627 cf
Plug -Flow detention time= 17.5 min calculated for 5.541 of (98% of inflow)
Center -of -Mass det. time= 6.2 min ( 819.3 - 813.0 )
Volume Invert Avail.Storage Storage Description
#1 754.11' 4,627 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
754.11 0 0 0
755.00 763 340 340
756.00 2,035 1,399 1,739
757.00 3,741 2,888 4,627
Device Routing Invert Outlet Devices
#1 Primary 757.67' 32.1' long x 0.5' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00
Coef. (English) 2.80 2.92 3.08 3.30 3.32
Primary OutFlow Max=56.03 cfs @ 12.04 hrs HW=758.34' (Free Discharge)
L1=Broad-Crested Rectangular Weir (Weir Controls 56.03 cfs @ 2.59 fps)

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 70
6
5
5
4
^. 4
3
3 3
0
FZ 2
2
1
1
Pond 17P: NE Landfill Corner
Hydrograph
56.48 cfs
Inflow ;Area=12275__1ac
P A EIIev458.L35'
Stpragpe _4,027
TIIT�I
�rtIIT
T T 1
T
T T T 1
T
T
T
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
— Inflow
— Primary

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 71
Hydrograph for Pond 17P: NE Landfill Corner
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
754.11
0.00
0.50
0.00
0
754.11
0.00
1.00
0.00
0
754.11
0.00
1.50
0.00
0
754.11
0.00
2.00
0.00
0
754.11
0.00
2.50
0.00
0
754.11
0.00
3.00
0.00
0
754.11
0.00
3.50
0.00
0
754.11
0.00
4.00
0.00
0
754.11
0.00
4.50
0.00
0
754.11
0.00
5.00
0.00
0
754.11
0.00
5.50
0.02
10
754.26
0.00
6.00
0.08
96
754.58
0.00
6.50
0.17
320
754.97
0.00
7.00
0.28
718
755.38
0.00
7.50
0.40
1,331
755.79
0.00
8.00
0.51
2,144
756.18
0.00
8.50
0.67
3,186
756.57
0.00
9.00
0.94
4,625
757.00
0.00
9.50
1.20
4,627
757.69
0.28
10.00
1.48
4,627
757.70
0.56
10.50
2.07
4,627
757.72
1.15
11.00
3.08
4,627
757.75
2.16
11.50
5.24
4,627
757.80
4.32
12.00
54.38
4,627
758.32
53.46
12.50
24.30
4,627
758.07
23.38
13.00
7.98
4,627
757.85
7.06
13.50
5.16
4,627
757.80
4.24
14.00
3.98
4,627
757.77
3.06
14.50
3.28
4,627
757.76
2.36
15.00
2.93
4,627
757.75
2.01
15.50
2.63
4,627
757.74
1.71
16.00
2.32
4,627
757.73
1.39
16.50
2.07
4,627
757.72
1.15
17.00
1.95
4,627
757.72
1.03
17.50
1.84
4,627
757.72
0.92
18.00
1.73
4,627
757.71
0.81
18.50
1.62
4,627
757.71
0.69
19.00
1.50
4,627
757.70
0.58
19.50
1.39
4,627
757.70
0.47
20.00
1.28
4,627
757.69
0.36
20.50
1.19
4,627
757.69
0.27
21.00
1.16
4,627
757.68
0.24
21.50
1.14
4,627
757.68
0.22
22.00
1.12
4,627
757.68
0.20
22.50
1.10
4,627
757.68
0.18
23.00
1.08
4,627
757.68
0.15
23.50
1.05
4,627
757.68
0.13
24.00
1.03
4,627
757.68
0.11

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 72
Summary for Pond 18P: NE Drainage
Inflow Area = 70.525 ac, 0.00% Impervious, Inflow Depth > 4.00" for 100 years - 24 hrs event
Inflow = 239.63 cfs @ 12.24 hrs, Volume= 23.528 of
Outflow = 34.51 cfs @ 13.19 hrs, Volume= 23.425 af, Atten= 86%, Lag= 57.1 min
Primary = 34.51 cfs @ 13.19 hrs, Volume= 23.425 of
Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Peak Elev= 756.56' @ 13.19 hrs Surf.Area= 148,044 sf Storage= 441,387 cf
Plug -Flow detention time= 121.3 min calculated for 23.377 of (99% of inflow)
Center -of -Mass det. time= 118.5 min ( 962.4 - 843.9 )
Volume Invert Avail.Storage Storage Description
#1 748.40' 9,895,353 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
748.40 0 0 0
750.00 14,816 11,853 11,853
755.00 84,565 248,453 260,305
760.00 288,422 932,468 1,192,773
765.00 431,675 1,800,243 2,993,015
770.00 647,950 2,699,063 5,692,078
775.00 1,033,360 4,203,275 9,895,353
Device Routing Invert Outlet Devices
#1 Primary 748.40' 24.0" Round RCP —Round 24"
L= 338.0' RCP, sq.cut end projecting, Ke= 0.500
Inlet / Outlet Invert= 748.40' / 745.02' S= 0.0100 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
Primary OutFlow Max=34.51 cfs @ 13.19 hrs HW=756.56' (Free Discharge)
L1=RCP_Round 24" (Barrel Controls 34.51 cfs @ 10.99 fps)

Post Closure -Dam Breach-100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCADO 10.00-20 s/n 01089 © 2017 HydroCAD Software Solutions LLC Page 73
260
240
220
200
180
160
140
0 120
" 100
80
60
40
20
0
Pond 18P: NE Drainage
Hydrograph
T_Ja
Inflow Are=70.5
Peak dlev.756.5
Storage=441,3872�0RoundCulvert
_O
L A
S=0.040V/1 - 34.51 cfs
4
T_ _
F
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hours)
Inflow
— Primary

Post Closure -Dam Breach_100 ft Breach Type 11 24-hr 100 years - 24 hrs Rainfall=7.94"
Prepared by AECOM Printed 9/26/2019
HydroCAD® 10.00-20 s/n 01089 ©2017 HydroCAD Software Solutions LLC Page 74
Hydrograph for Pond 18P: NE Drainage
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
748.40
0.00
0.50
0.00
0
748.40
0.00
1.00
0.00
0
748.40
0.00
1.50
0.00
0
748.40
0.00
2.00
0.00
0
748.40
0.00
2.50
0.00
0
748.40
0.00
3.00
0.00
0
748.40
0.00
3.50
0.00
0
748.40
0.00
4.00
0.00
0
748.40
0.00
4.50
0.00
0
748.40
0.00
5.00
0.00
0
748.40
0.00
5.50
0.00
0
748.40
0.00
6.00
0.00
0
748.40
0.00
6.50
0.00
0
748.40
0.00
7.00
0.00
0
748.40
0.00
7.50
0.00
0
748.40
0.00
8.00
0.00
0
748.40
0.00
8.50
0.00
0
748.40
0.00
9.00
0.00
0
748.40
0.00
9.50
0.59
904
748.82
1.16
10.00
1.54
1,593
748.98
1.99
10.50
3.27
2,758
749.17
3.34
11.00
6.36
4,929
749.43
5.64
11.50
13.00
9,593
749.83
9.82
12.00
133.56
62,682
751.84
23.62
12.50
134.79
361,889
755.97
33.43
13.00
42.96
438,785
756.54
34.47
13.50
25.35
436,622
756.52
34.45
14.00
19.02
415,795
756.38
34.19
14.50
15.33
386,788
756.17
33.80
15.00
13.58
353,946
755.91
33.31
15.50
12.12
319,261
755.61
32.75
16.00
10.64
283,053
755.25
32.06
16.50
9.38
245,642
754.82
31.22
17.00
8.75
208,239
754.35
30.25
17.50
8.21
171,655
753.84
29.18
18.00
7.69
136,155
753.29
27.98
18.50
7.15
102,011
752.69
26.60
19.00
6.60
69,825
752.01
24.42
19.50
6.06
42,139
751.27
20.70
20.00
5.50
21,095
750.50
15.88
20.50
5.06
9,255
749.81
9.55
21.00
4.90
5,913
749.52
6.59
21.50
4.79
5,184
749.46
5.91
22.00
4.69
4,977
749.43
5.69
22.50
4.59
4,861
749.42
5.57
23.00
4.48
4,759
749.41
5.46
23.50
4.37
4,658
749.40
5.35
24.00
4.27
4,556
749.38
5.25

APPENDIX C2
SOIL QUANTITIES

ASCOM
Job
Description
Duke Energy — Belews Creek Closure
CCR Material and Soil Quantities
Project No. 60603274
Computed by KDO/SD
Sheet 1 of 4
10/09/19
Checked by KK Date 10/11/19
The purpose of this memorandum is to summarize the results of the estimated coal combustion
residual (CCR) (also referred to as "ash") cut volumes, ash basin main dam cut volumes, and soil
cut and fill volumes for the closure of the Belews Creek Steam Station Ash Basin. Landfill
volumes will be provided as part of the landfill permit package, to be provided at a later date.
It is important to note material swelling, shrinkage, and wastage were not considered at this
stage of the design. These factors will be incorporated during the detailed design phase.
Figures, calculations, and computer program outputs are provided as attachments and are
referenced herein.
METHODOLOGY
Proposed Ash Removal: For the ash basin closure, a closure -by -excavation method will be
utilized. Because of this all ash within the CCR unit boundary will be removed. The proposed
final grades, which will match historical grades, were compared with the existing
topographic and bathymetric contour grades to estimate the amount of ash within the ash
basin. In addition to this, Duke Energy provided an in -place CCR tonnage as of June 2019.
The proposed final ash grading, existing topography and bathymetry, and associated isopach
can be found in Appendix A of the closure report and a portion has been replicated as
Attachment A. It has been assumed that one foot of overcut will be required.
Borrow Soil: A stormwater diversion and borrow area is being proposed to the northeast of
the ash basin, near the Pine Hall Road embankment. This area will be used to provide soil
where needed. The following "Soil Fill" sections will further detail how this soil will be
utilized.
Soil Fill: Portions of the excavated area near the Pine Hall Road embankment will be filled to
promote drainage to the proposed basins. In these locations, a comparison between the
existing topographic grades and historical grades was created to estimate the amount of soil
fill needed. Native soil will be cut from the proposed borrow area for this use.
Soil will also be used to create the detention basin berm and retention basin berm. A
comparison between the proposed grades for these features and historical grades was
created to estimate the amount of soil fill required. Soil from the proposed borrow area will
also be used to create these basins berms.
Main Dam: The Ash Basin Main Dam will be breached and partially removed during closure
of the Ash Basin. The soil available from lowering the Ash Basin Main Dam was calculated by
comparing the dam grades before and after removal. An isopach was created using Autocad
2018 and Civil3d to visualize this area and can be found in Attachment B.
Belews Creek CCR Material and Soil Quantities Memo

ASCOM
Job
Description
Duke Energy — Belews Creek Closure
CCR Material and Soil Quantities
II. QUANTITY SUMMARIES
Project No. 60603274
Computed by KDO/SD
Sheet 2 of 4
10/09/19
Checked by KK Date 10/11/19
Proposed Ash Removal: Based on topographic and bathymetric surveys performed on April
2014 and June 2014, respectively, the Ash Basin is estimated to contain approximately 9.9
million cubic yards (9,859,304 cubic yards) of ash or an estimated 11.8 million tons
(11,831,165 tons) of ash, using a density of 1.2 tons per cubic yards being assumed by Duke
Energy for their fleet for reporting purposes. It is noted that based on estimates of net CCR
disposal rates into the Ash Basin since the dates of these surveys, Duke Energy has reported
an in -place CCR tonnage of 11.97 million tons (9.98 million cubic yards) as of June 2019.
AECOM understands Duke Energy utilized plant operation data to estimate ongoing CCR
placement rates. In addition to the reported quantity of ash, an assumed one foot of
overcut across the 270 acre ash basin was accounted for in the volume calculations. The one
foot of overcut is assumed to be a soil/CCR mix and therefore qualifies as CCR for the
purpose of this memorandum. The calculated ash cut volume for this one foot of overcut is
435,599 cubic yards.
Borrow Soil: The Borrow Area is estimated to provide 544,355 cubic yards of soil. This value
was determined by comparing the existing and proposed grading concepts of the borrow
area in Civil 3D.
Soil Fill: Civil 3D was used to create volume comparison surfaces where the soil fill will be
placed. Where the historical grades near the Pine Hall Road embankment are being filled
the calculated soil fill volume required is 44,385 cubic yards. The detention basin will require
a soil fill volume of 4,585 cubic yards. The retention basin will require a soil fill volume
of 21,938 cubic yards. This is a net fill of 70,908 cubic yards of soil.
Main Dam: Civil 3D was used to create volume comparison surfaces where the dam will be
breached. The calculated volume of material being cut is 649,823 cubic yards. The proposed
dam breach, existing topography and bathymetry, and associated isopach can be found in
Attachment B.
Belews Creek CCR Material and Soil Quantities Memo

ASCOM
Job
Description
Duke Energy — Belews Creek Closure
CCR Material and Soil Quantities
Project No. 60603274 Sheet 3 of 4
Computed by KDO/SD 10/09/19
Checked by KK Date 10/11/19
The earthwork volume demands stated above are summarized in Table 1.
Table 1— Summary of Estimated Ash and Soil Quantities
Material Description
Cubic 3
Yards (Yd )
Comments
Total Cut Volume
11,609,777
Ash Cut/Removal
9,980,000
Reported in -place CCR volume as reported by Duke Energy in June 2019.
1' Overcut
435,599
Based on multiplying the 270 acres by 1 foot.
Dam Breach Cut/Removal
649,823
Based on the comparing existing topographic and bathymetric surfaces with
proposed dam breach.
Borrow Area Soil Cut
544,355
Based on comparing existing topographic surfaces with proposed borrow area
grading.
Total Soil Fill Volume
70,908
Soil Fill for Detention Basin Berm
4,585
Based on comparing historical topographic surfaces with proposed surface.
Soil Fill for Retention Basin Berm
21,938
Based on comparing historical topographic surfaces with proposed surface.
Soil Fill for Drainage Fill
44,385
Based on comparing historical topographic surfaces with proposed surface.
III. Summary
Preliminary volume estimates for the closure by excavation project are provided in Table 1. As
design proceeds, these volumes may be updated. Volumes associated with the proposed
landfill will be developed as part of its permit application design.
Belews Creek CCR Material and Soil Quantities Memo

ASCOM
Job Duke Energy — Belews Creek Closure
Description CCR Material and Soil Quantities
IV. Attachments
Project No. 60603274
Computed by KDO/SD
Checked by KK
Attachment A
- Figure A-1— Final Ash Grading Cut Thickness
Attachment B
- Figure B-1— Dam Breach Grading Cut Thickness
Sheet 4 of 4
in/na/la
Date 10/11/19
Belews Creek CCR Material and Soil Quantities Memo

ATTACHMENT A
Belews Creek CCR Material and Soil Quantities Memo

REV. 0
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P:\PROJECTS2\60603274_BELEWS_CREEK\900_CAD_GIS\910_CAD\05_MODELS\CIVIL\X-ASH REMOVAL ISOPACH-BELEWS CREEK.DWG 10/10/2019 12:32:36 PM / / r/ - ! I f / / /// FILL � 1 y III I11 ► / , , /r -\, r^
0 1 2 3 2 TENTHS 10 20 30 3 4 5
CLOSURE BY EXCAVATION
SHALL BE FIELD VERIFIED
(SEE NOTE 3 AND 4)
-_
of -
•
/, III/ / 1, o
r
A=COM
N.C. ENGINEERING LICENSE NO
F-0342
N
LEGEND
- - - - - CCR UNIT BOUNDARY (APPROXIMATE)
- - - - - - - - - EXISTING SITE FEATURE (APPROXIMATE)
CLOSURE MINOR CONTOUR (5 FT)
CLOSURE MAJOR CONTOUR (25 FT)
AB-204-BORING ID
0707.90 BOTTOM OF ASH ELEVATION
711.73 ACCORDING TO BORINGS
710.36
HISTORICAL (1969) GRADE
EXISTING GRADE
NOTE
1. BASIS OF BEARINGS: INC GRID NAD83/2011. ELEVATIONS ARE BASED
ON NAVD88.
2. GRADES SHOWN WITHIN CCR UNIT BOUNDARY DEPICT HISTORICAL
GRADES.
3. THREE SOURCES OF INFORMATION WERE CONSIDERED WITH
REGARDS TO POTENTIAL FUTURE GRADES FOR THE CLOSURE BY
EXCAVATION AREA, GIVEN THE ABSENCE OF ASBUILT BOTTOM OF
ASH GRADES FOR THE ASH BASIN. THESE INCLUDE THE
PREDEVELOPMENT HISTORICAL GRADES WHICH CAN TYPICALLY BE
CONSIDERED THE BOTTOM OF ASH GRADES IN THE ABSENCE OF
ASBUILT GRADES, EXISTING BATHYMETRY CONTOURS WHICH CAN
BE CLOSE TO THE BOTTOM OF ASH GRADES IF ASH THICKNESS IS
MINIMAL, AND INTERPRETED BOTTOM OF ASH ELEVATIONS BASED
ON LIMITED NUMBER OF DISCRETE POINTS WHERE SUBSURFACE
INVESTIGATION WAS CONDUCTED IN 2018.
4. THE THREE SOURCES OF INFORMATION REFERENCED ABOVE AND
SHOWN ON THIS DRAWING ARE FOUND TO BE NOT CONSISTENT AT
LOCATIONS FOR THE BELEWS CREEK OPEN WATER PORTION OF
THE ASH BASIN. IN SOME AREAS THE HISTORICAL GRADES ARE
ABOVE THE 2015 BATHYMETRY GRADES. THEREFORE, CHANGES TO
THE PROPOSED FINAL ELEVATIONS WILL NEED TO BE BASED ON
ACTUAL FIELD CONDITIONS UNCOVERED DURING CONSTRUCTION
AND/OR PRE -CONSTRUCTION INVESTIGATION.
ASH DEPTH
Number
Minimum Depth
Maximum Depth
Color
1
-85.00
-80.00
2
-80.00
-70.00
3
-70.00
-60.00
4
-60.00
-50.00
5
-50.00
-40.00
6
-40.00
-30.00
7
-30.00
-20.00
8
-20.00
-10.00
9
I -10.00
0.00
0 300 600 900
GRAPHIC SCALE (IN FEET)
TITLE
FINAL ASH GRADING CUT
THICKNESS
BELEWS CREEK STEAM STATION
STOKES COUNTY, NORTH CAROLINA
FOR
ISSUED FOR REVIEW
DUKEDWG
- ENEK%,7Y®
SCALE: AS SHOWN
DES: SDIKO
TYPE :.DWG
DFTR : SD/KO
JOB NO: 603274
CHKD: SD
[DATE. 09608 2 19
ENGR: KO
FILENAME( -ASH REMOVAL ISOPACH-BELEWS CREEK.DW
PPD: KK
DWG SIZE
DRAWING NO.
REVISION
ANSI D
22.0"x34.0"
FIGURE A-1
0
Z1
M
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ATTACHMENT 6
Belews Creek CCR Material and Soil Quantities Memo

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N:928778.159' —
TRU E:1682155.174' `��� �� �\ �\\ ��\\ \ --_^ -_ -- -' / / ��� / �/' / �� G \
nygAl '' ELEV:770.04' /
I / 'EDGE OF WATER ELEVATION ���\ \ `-- --__-_ - ---------` \
RECORDED 12/13/2018
_
CONCRETE TOWER
tj�
W/RELEASE VALVE �//` ���-�\ --_ - - -ASH BASIN MAIN DAMI0���' TOP CONC.=764.40' _—__,— //' ��\—_�,—�,�--___ �_ (STOKE-116)--_— _
_ __
-- -
/ -� - - _ - _ / -----------
- - _ N.
----- / `- - - - - -
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-\ \ `\ / 1 / — — — — — — —
�_--------------------------------------
NN
--------------
�\
\ \
\ \ \ \ \ \\\\`\ \\\\ \ \`\ / \> / / j / // /l 11 l l 11 I I /�__�''-'/_ '�___ii��_�
\ , le
// / / / / / / / / / / /
Ile
CLOSURE BY EXCAVATION
\ \ \ \ / / ' / , // / ' / , / //' / / SHALL BE FIELD VERIFIED
NI Cl�CAII'l
1
2
CCR UNIT BOUNDARY (APPROXIMATE)
— — — — — — — — — EXISTING SITE FEATURE (APPROXIMATE)
CLOSURE MINOR CONTOUR (5 FT)
CLOSURE MAJOR CONTOUR (25 FT)
PROPOSED DAM BREACH MINOR CONTOUR (5 FT)
PROPOSED DAM BREACH MAJOR CONTOUR (25 FT)
NOTE
BASIS OF BEARINGS: NC GRID NAD83/2011. ELEVATIONS ARE BASED
ON NAVD88.
GRADES SHOWN WITHIN CCR UNIT BOUNDARY DEPICT HISTORICAL
GRADES.
DEPTH OF EXCAVATION
Number
Minimum Depth
Maximum Depth
Color
1
—135.00
—130.00
2
—130.00
—120.00
3
—120.00
—110.00
4
—110.00
—100.00
5
—100.00
—90.00
6
—90.00
—80.00
7
—80.00
—70.00
8
—70.00
—60.00
9
—60.00
—50.00
10
—50.00
—40.00
11
—40.00
—30.00
12
—30.00
—20.00
13
—20.00
—10.00
14
10.00
0.00
TITLE
0 75 150 225
GRAPHIC SCALE (IN FEET)
DAM BREACH GRADING CUT
THICKNESS
BELEWS CREEK STEAM STATION
STOKES COUNTY, NORTH CAROLINA
FOR ISSUED FOR REVIEW
NN \ `\ `\ \ `\ `\ CLOSURE BY EXCAVATION / / / ; , / , ; / / , / ,',' /' /
\ SHALL BE FIELD VERIFIED / / / ' � / ' DUKE SCALE: A H WN
` ` �\ �` `\ \ `\ \ ��'� / /' /' / / / i / / / l / i /'� / DWG TYPE :.DWG
It—NNN/ / / / /, , / �, ENERGY® JOB N0: 60603274
\\ \ \ \ \\ \\ \ \\ \ \\ \\ `\ / ' /' i / /
\ \ \ _ __ / , / / / / /, , / � DATE: 09-18-2019
FILENAMEX-DAM BREACH ISOPACH-BELEWS CREEK.
DWG SIZE DRAWING NO.
ANSI D
N.C. ENGINEERING LICENSE NO. 22.0"x34.0" FIGURE B-1
P:\PROJECTS2\60603274—BELEWS—CREEK\900—CAD—GIS\910—CAD\05—MODELS\CIVIL\X—DAM BREACH ISOPACH—BELEWS CREEK.DWG 10/10/2019 4:58:53 PM/ / , / / 4 / ; / F-0342
DES: SD/KO
DFTR : SD/KO
CHKD: SD
ENGR : KO
APPD: KK
REVISION
C
0 1 2 3 i ITENTHS 1,0 20 30