Courtyards at Emerald Lakes - Complete Stormwater Report 02-22-2018

1.0 INTRODUCTION

The Project is a proposed 35.3 acre single family residential subdivision with 93 lots, associated
roadways and one clubhouse and pool. The site is undeveloped and is largely wooded. The site
has a few defined drainage draws all conveying stormwater to the existing un-named stream along
the southern property line and Lawyers Road. The site generally slopes 2% to 5% towards the un-
named stream.

The proposed development will be divided into two distinct watersheds. The majority of the
watershed will be collected by storm sewers and conveyed to a wet pond BMP located at the
northeast portion of the site. The southern portion of Avalon Place roadway and lot areas will have
the stormwater runoff collected by storm sewers and conveyed to a wet pond BMP.

There is 7.65 acres of off-site drainage area to the west that drains toward the southwest corner
of the property and to the un-named stream. Currently, only a portion of this offsite drainage area
flows across the project property. The post development grading will install a drainage swale along
the west property line to effectively direct the stormwater to the un-named stream without entering
the project site. Therefore, this offsite drainage area is shown on our drainage mapping, but not
included in the stormwater calculations.

The 0.32 acre offsite drainage area along the west property line will be collected and conveyed
to the wet pond BMP. The offsite area drainage will be included in the stormwater calculations.

The existing 0.36 acre and 0.63 acre drainage area to the northwest current drain from the project
site to the adjacent properties. These areas will be reduced in areas that drain offsite and will
remain largely undeveloped. The reduced areas will be included in the developed areas draining
to the wet pond BMP; while the smaller, undeveloped areas will continue to drain offsite as they
have and will have reduced stormwater runoff peak flows from the reduced areas.

The 0.73 acre offsite drainage area located near the northeast portion of the site currently drains
onto the project site and will continue to drain into the project and will be collected by storm sewers
and conveyed to the wet pond. No change in to the existing charactoristics of the 0.73 acre area
is proposed.

The two on-site watersheds will have portions of the drainage areas that will be collected and
conveyed to the proposed stormwater BMPs and will have portions of the drainage areas that will
be left undeveloped and continue to direct discharge to the un-named stream. Each of the proposed
watersheds area analyzed separately and provides water quality for the developed portions of
the site and provides for a balanced overall stormwater control for the combined controlled and
directly discharged portions of the developed project. See the Pre and Post Tributary Area Maps
for reference.

2.0 EXISTING HYDROLOGY

The existing conditions hydrology exhibited on the Pre-Development Tributary Plan within the
construction plan set. The majority of the site is wooded in good hydrologic condition and is
predominantly Secrest – Cid Complex (ScA), Type C soils. Smaller portions of the project site have

Badin Channery Silt Loam, 2 to 8% slopes, Type B and Tarrus Gravelly Silt Loam, 2 to 8% slopes,
Type B soils. Type C soils was used for calculations to be conservative. The time of concentration
was calculated for each watershed and a minimum 7.5 minutes was used for the calculations, see
the HydroCAD output in Appendix B.

Rainfall Depths

Storm Event Rainfall Depth Rainfall Distribution
WQ 1.00 6-hr Type II
1-yr CPv 2.58 24-hr Type II
2 - year 2.28 6-hr Type II
10-year 3.72 6-hr Type II
25-year 4.38 6-hr Type II
50-year 4.92 6-hr Type II

3.0 PROPOSED CONDITIONS

The proposed site consists of single family, 1/4 acre lots, an amenity area, associated roadways
and the two stormwater BMP structures. The rooftops, driveways, parking lots and onsite lawn areas
drain to storm inlets and yard catch basins that collects and conveys the runoff to the stormwater
management structures. The on-site stormwater runoff is routed through the BMP basins structures to
provide the required water quality BMP as well as Channel Protection Volume (CPv) control. The
less frequent storm event runoff flows are routed through the BMP structures without topping the
structures. BMP water quality calculations are included in Appendix A. The stormwater routing
output from the HydroCAD models are included in Appendix B. Some key elements of the
calculations are as follows:

1. The Channel Protection Volume (CPv) and peak release rates and elevations are calculated
for the pre-development and post development 1 yr, 24 hr Type II storm events. The storm
event volume difference is the CPv volume. The CPv and WQv volumes are added together
to determine the control volume and peak elevation in the BMPs to provide the appropriate
WQv and CPv control.

2. The 2 through 50 year, 6 hr Type II storm occurrence stormwater runoff release rates are
routed through the Wet Pond basins without topping the basins.

3. Actual percent of pervious and impervious areas were calculated for each RG watershed.

4. The travel paths for the stormwater runoff were also calculated; the minimum Time of
Concentration (Tc) was 7.5 minutes for all subareas.

4.0 WEST WET BASIN DESIGN

The northern 4.19 acres of proposed development stormwater runoff is collected by storm sewers
and conveyed to a wet basin system to the west. See Appendix A for Wet Pond calculations.

The Wet Basin will provide the Channel Protection Volume (CPv) as well as control the peak
release reates for the 2 year through 50 year storm event stormwater runoff to those of the pre-
development peak release rates. The CPv for this area is calculated as the difference of the post
development 1 year event hydrograph runoff volume and the pre-development 1 year event
hydrograph volume. The CPv is to be release over 48 hours.

CPv = Post Vol (19,921cf) – Pre Vol (15,045cf) = 4876 cf. The CPv added to the WQv of
7,595cf = 12,471cf of volume to control the release over 48 hours; the maximum diameter outlet
orifice = 1.0 inches.

The Wet Basin normal water elevation is 637.50; the top of basin elevation is 642.00. The
maximum storage volume available is 67,620 cf. The basin will route the WQv, CPv and the 2
year through 50 year storm event runoffs without topping the basin crest.

The outlet control is a two (2) stage structure. The primary control is provided by one (1) 1.00 inch
orifice with invert set at 637.50 feet. The volume provided for the water quality/ CPv is from the
wet pond normal pool elevation (637.50) to the crest of the secondary outlet control. The
secondary outlet control is provided by one 24.0 inch wide by 9.0 inch high slot weirs with crests
set at 638.55 located on the face of the concrete control structure box. A 10 feet long emergency
weir is included along the top of the detention basin; the crest of the emergency weir is set at
641.50. The top of the wet pond is 642.00.

West Wet Pond Water Quality & CPv Summary Table
Event Peak Inflow (cfs) Peak Discharge
(cfs)
Peak HWL (ft) Peak Storage
(cu-ft)
WQ (HydoCAD) 1.51 0.02 638.27 7,679
CPv 0.33 638.68 12,485

West Wet Pond Routing Calculation Table
Event Post-Dev
Inflow (cfs)
Post Dev
Routed Peak
(cfs)
Basin Peak
HWL (ft)
Basin Peak
Storage (cu-ft)
1 9.13 0.35 638.69 12,561
2 9.17 0.49 638.72 12,989
10 17.61 4.16 639.29 20,214
25 24.38 5.88 639.60 24,588
50 28.40 6.95 639.85 28,538

West Watershed Combined Hydrograph Summary Table

Combined Summary Table
Event Pre-Dev Peak
Flow (cfs)
Post-Dev
Inflow (cfs)
1 4.16 1.39
2 3.65 1.36
10 13.20 8.05
25 20.04 12.47
50 25.19 15.67

5.0 EAST WET BASIN DESIGN

The eastern 22.5 acres of proposed development stormwater runoff is collected by storm sewers
and conveyed to a wet basin system located at the project eastern entry. The basin is comprised
of two basins connected by a culvert that equalizes the basin stormwater peak elevations. The
two compartment volumes are added together for routing calculations. See Appendix A for Wet
Pond calculations.

CPv = Post Vol (85,019cf) – Pre Vol (33,802cf) = 51,217cf. The CPv added to the WQv of
31,472 cf = 82,689 cf of volume. The WQv of 31,472 cf with a head of 1.36 feet is controlled
to release over 48 hours; the maximum diameter outlet orifice = 2.00 inches.

The Wet Basin normal water elevation is 634.50; the top of basin elevation is 640.00. The
maximum storage volume available is 161,487 cf. The basin will route the WQv, CPv and the 2
year through 50 year storm event runoffs without topping the basin crest.

The outlet control is a two (2) stage structure. The primary control is provided by one (1) 2.00 inch
orifice with invert set at 634.50 feet. The volume provided for the water quality/ CPv is from the
wet pond normal pool elevation (634.50) to the crest of the secondary outlet control. The
secondary outlet control is provided by four (4) 24.0 inch wide by 9.0 inch high slot weirs with
crests set at 637.68 located on the face of the concrete control structure box. A 10 feet long
emergency weir is included along the top of the detention basin; the crest of the emergency weir
is set at 639.50. The top of the wet pond is 640.00.

Wet Pond Water Quality & CPv Summary Table
Event Peak Inflow (cfs) Peak Discharge
(cfs)
Peak HWL (ft) Peak Storage
(cu-ft)
WQ (HydoCAD) 2.61 0.12 635.86 31,684
CPv 0.15 637.68 82,713

Wet Pond Routing Calculation Table
Event Post-Dev
Inflow (cfs)
Post Dev
Routed Peak
(cfs)
Basin Peak
HWL (ft)
Basin Peak
Storage (cu-ft)
1 10.65 0.15 636.60 51,298
2 10.83 0.14 636.28 42,789
10 28.80 4.12 637.97 91,570
25 39.33 10.81 638.23 100,109
50 47.57 17.88 638.46 107,568

East Watershed Combined Hydrograph Summary Table

Combined Summary Table
Event Pre-Dev Peak
Flow (cfs)
Post-Dev
Inflow (cfs)
1 4.64 2.45
2 4.93 1.97
10 17.82 6.89
25 25.54 10.79
50 32.21 13.52

APPENDIX A:

Wet Pond Calculations

Courtyards of Emerald Lake 9/26/2014
Stormwater Management Calculations East Wet Pond Design
Notes
Predeveloped Calculations Wet Basin Untreated
Discharge
Total Area (ac)18.85 0 18.85 acres total
Existing Woods HSG C (RCN=70)18.85
Existing Pond HSG B (RCN=98)0.00 0.00
Open Grass / Weeds HSG B (RCN=61)0.00
Open Space Type C (RCN=74)0.00
Existing Impervious Area 0.00 0.00 acres of impervious area ex condition
Composite RCN 70 70 RCN based on existing conditions
Tc (min)57 0
1-year Peak (cfs)3.90 0.00
10-year Peak (cfs)14.96 0
Post Developed Subareas
Subarea Wet Basin
Untreated
Discharge
Area (ac)18.85 0.00 18.85 acres total
% Imp 46%100%
RCN 78 98
Tc 39.1 0
1-year Peak (cfs)10.65 0.00 undetained peak
10-year Peak (cfs)28.80 0.00 undetained peak
Allowable Release Rate
Total Area within Pre Subarea 18.85
Existing Woods Type B (RCN=55)
Existing Woods Type C (RCN=70)18.85
Open Grass / Weeds HSG B (RCN=61)0
Open Space Type C (RCN=74)0
Existing Impervious Area 0
Composite RCN 70
Applied Existing Impervious Area 0.00
Modified RCN 70
Tc (min)57
Total 1-year Peak (cfs)3.90
Total 10-year Peak (cfs)14.96
Pro-rated 1-year Allowable (cfs)3.90
Pro-rated 10-year Allowable (cfs)14.96
Water Quality Calculations
Existing Impervious Area Treated 0.00 0.00 existing impervious area treated
Impervious Area not Treated 0.00 0.00 0.00 prop imperv area not treated for WQ
% Imp 46
Rv 0.460
WQv (ac-ft)0.72 18.84 ac developed
WQv (cu-ft)31472
75% WQv (cu-ft)23604
WQv Provided 51748 -see Hydrocad Output
Water Quality Storage Pipe Design
Lowest Top of Casting (ft)
Invert (ft)
Size (in)
Length (ft)
Top of Pipe Elevation (ft)
Water Quality Elevation (ft)static water quality elevation
Invert StormFilter Out (ft)
Overflow Weir Elevation (ft)
Min. Overflow Weir Width (ft)
1-year Peak Elevation (ft)
10-year Peak Elevation (ft)
Detention Pipe Design
Invert/Normal Pool (ft)
Size (in)
Length (ft)
Top of Pipe/Bank Elevation (ft)
Available Storage (cu-ft)
1st Stage Outlet:
2nd Stage Outlet:
Tailwater Control Orifice (in)
Inlet Pipe Size
Outlet Pipe Size
1-year Peak Elevation (ft)
10-year Peak Elevation (ft)
Wet/Dry/Sand Filter Surface Storage Design wet basin
Top Sand/Normal Pool (ft)634.50
Top of Bank (ft)640.00
1st Stage Outlet:2.0" orifice @
634.50
2nd Stage Outlet:(4) 24" wide
weirs @ 637.68
3rd Stage Outlet:10' wide Trap
weir @ 639.50
Tailwater Control Orifice (in)15" storm @
632.00
Emergency Spillway Elevation (ft)639.50
Emergency Spillway Width (ft)10.00
1-year Peak Elevation (ft)636.6
10-year Peak Elevation (ft)637.97
50-year Peak Elevation (ft)638.46
Results
1-year Peak Release (cfs)na 0.00
1-year Allowable (cfs)na 0.00
10-year Peak Release (cfs)na 0
10-year Allowable (cfs)na 0.00
Total Storage (cu-ft)na 0
10-year Storage Used (cu-ft)na 0
Courtyards of Emerald Lake 9/26/2014
Stormwater Management Calculations West Wet Pond Design
Notes
Predeveloped Calculations Wet Basin Untreated
Discharge
Total Area (ac)4.192 0 4.19 acres total
Existing Woods HSG C (RCN=70)4.19
Existing Pond HSG B (RCN=98)0.00 0.00
Open Grass / Weeds HSG B (RCN=61)0.00
Open Space Type C (RCN=74)0.00
Existing Impervious Area 0.00 0.00 acres of impervious area ex condition
Composite RCN 70 70 RCN based on existing conditions
Tc (min)16.5 0
1-year Peak (cfs)4.16 0.00
10-year Peak (cfs)13.2 0
Post Developed Subareas
Subarea Wet Basin
Untreated
Discharge
Area (ac)4.19 0.00 4.19 acres total
% Imp 50%100%
RCN 86 98
Tc 7.5 0
1-year Peak (cfs)9.13 0.00 undetained peak
10-year Peak (cfs)17.61 0.00 undetained peak
Allowable Release Rate
Total Area within Pre Subarea 4.192
Existing Woods Type B (RCN=55)
Existing Woods Type C (RCN=70)4.192
Open Grass / Weeds HSG B (RCN=61)0
Open Space Type C (RCN=74)0
Existing Impervious Area 0
Composite RCN 70
Applied Existing Impervious Area 0.00
Modified RCN 70
Tc (min)16.5
Total 1-year Peak (cfs)4.16
Total 10-year Peak (cfs)13.20
Pro-rated 1-year Allowable (cfs)4.16
Pro-rated 10-year Allowable (cfs)13.20
Water Quality Calculations
Existing Impervious Area Treated 0.00 0.00 existing impervious area treated
Impervious Area not Treated 0.00 0.00 0.00 prop imperv area not treated for WQ
% Imp 50
Rv 0.499
WQv (ac-ft)0.17
WQv (cu-ft)7595
75% WQv (cu-ft)5696
WQv Provided 51748 -see Hydrocad Output
Water Quality Storage Pipe Design
Lowest Top of Casting (ft)
Invert (ft)
Size (in)
Length (ft)
Top of Pipe Elevation (ft)
Water Quality Elevation (ft)static water quality elevation
Invert StormFilter Out (ft)
Overflow Weir Elevation (ft)
Min. Overflow Weir Width (ft)
1-year Peak Elevation (ft)
10-year Peak Elevation (ft)
Detention Pipe Design
Invert/Normal Pool (ft)
Size (in)
Length (ft)
Top of Pipe/Bank Elevation (ft)
Available Storage (cu-ft)
1st Stage Outlet:
2nd Stage Outlet:
Tailwater Control Orifice (in)
Inlet Pipe Size
Outlet Pipe Size
1-year Peak Elevation (ft)
10-year Peak Elevation (ft)
Wet/Dry/Sand Filter Surface Storage Design wet basin
Top Sand/Normal Pool (ft)637.50
Top of Bank (ft)642.00
1st Stage Outlet:1.0" orifice @
637.50
2nd Stage Outlet:24" wide weirs @
638.55
3rd Stage Outlet:10' wide Trap
weir @ 641.50
Tailwater Control Orifice (in)24" storm @
636.70
Emergency Spillway Elevation (ft)641.50
Emergency Spillway Width (ft)10.00
1-year Peak Elevation (ft)638.69
10-year Peak Elevation (ft)639.29
50-year Peak Elevation (ft)639.85
Results
1-year Peak Release (cfs)na 0.00
1-year Allowable (cfs)na 0.00
10-year Peak Release (cfs)na 0
10-year Allowable (cfs)na 0.00
Total Storage (cu-ft)na 0
10-year Storage Used (cu-ft)na 0

APPENDIX B:
HydroCAD Output

3S
West Post
E1
Pre. East WS
E1-A
Pre. East WS to BMP
E2
East Post
E3
East Onsite Bypass
W1
Pre. West WS
W1-A
Pre. West WS W3
West Onsite Bypass
1P
West Basin
5P
Prop Retention Pond
East
1L
(new Link)
6L
East Post Comb
Routing Diagram for 20131483-RG1-Det-comb 2-20-18
Prepared by Symanetc, Printed 2/22/2018
HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Subcat Reach Pond Link
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 2HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment 3S: West Post
Runoff = 9.13 cfs @ 11.99 hrs, Volume= 19,921 cf, Depth= 1.31"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Type II 24-hr 1 yr Rainfall=2.58"
Area (ac) CN Description
2.092 98 Paved parking, HSG C
2.100 74 >75% Grass cover, Good, HSG C
4.192 86 Weighted Average
2.100 50.10% Pervious Area
2.092 49.90% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
7.5 Direct Entry, Min Tc
Subcatchment 3S: West Post
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)10
9
8
7
6
5
4
3
2
1
0
Type II 24-hr
1 yr Rainfall=2.58"
Runoff Area=4.192 ac
Runoff Volume=19,921 cf
Runoff Depth=1.31"
Tc=7.5 min
CN=86
9.13 cfs
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 3HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment 3S: West Post
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.03 0.00 0.00
2.00 0.06 0.00 0.00
3.00 0.09 0.00 0.00
4.00 0.12 0.00 0.00
5.00 0.16 0.00 0.00
6.00 0.21 0.00 0.00
7.00 0.26 0.00 0.00
8.00 0.31 0.00 0.00
9.00 0.38 0.00 0.02
10.00 0.47 0.01 0.06
11.00 0.61 0.04 0.19
12.00 1.71 0.64 9.07
13.00 1.99 0.84 0.55
14.00 2.12 0.94 0.33
15.00 2.20 1.00 0.26
16.00 2.27 1.06 0.21
17.00 2.33 1.10 0.18
18.00 2.38 1.14 0.16
19.00 2.42 1.18 0.14
20.00 2.46 1.21 0.12
21.00 2.49 1.23 0.11
22.00 2.52 1.26 0.11
23.00 2.55 1.29 0.10
24.00 2.58 1.31 0.10
25.00 2.58 1.31 0.00
26.00 2.58 1.31 0.00
27.00 2.58 1.31 0.00
28.00 2.58 1.31 0.00
29.00 2.58 1.31 0.00
30.00 2.58 1.31 0.00
31.00 2.58 1.31 0.00
32.00 2.58 1.31 0.00
33.00 2.58 1.31 0.00
34.00 2.58 1.31 0.00
35.00 2.58 1.31 0.00
36.00 2.58 1.31 0.00
37.00 2.58 1.31 0.00
38.00 2.58 1.31 0.00
39.00 2.58 1.31 0.00
40.00 2.58 1.31 0.00
41.00 2.58 1.31 0.00
42.00 2.58 1.31 0.00
43.00 2.58 1.31 0.00
44.00 2.58 1.31 0.00
45.00 2.58 1.31 0.00
46.00 2.58 1.31 0.00
47.00 2.58 1.31 0.00
48.00 2.58 1.31 0.00
49.00 2.58 1.31 0.00
50.00 2.58 1.31 0.00
51.00 2.58 1.31 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 2.58 1.31 0.00
53.00 2.58 1.31 0.00
54.00 2.58 1.31 0.00
55.00 2.58 1.31 0.00
56.00 2.58 1.31 0.00
57.00 2.58 1.31 0.00
58.00 2.58 1.31 0.00
59.00 2.58 1.31 0.00
60.00 2.58 1.31 0.00
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 4HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E1: Pre. East WS
Runoff = 4.64 cfs @ 12.70 hrs, Volume= 40,258 cf, Depth= 0.49"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Type II 24-hr 1 yr Rainfall=2.58"
Area (ac) CN Description
22.450 70 Woods, Good, HSG C
22.450 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
49.7 270 0.0185 0.09 Sheet Flow, East-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
7.3 940 0.0176 2.14 Shallow Concentrated Flow, West Shallow
Unpaved Kv= 16.1 fps
57.0 1,210 Total
Subcatchment E1: Pre. East WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)5
4
3
2
1
0
Type II 24-hr
1 yr Rainfall=2.58"
Runoff Area=22.450 ac
Runoff Volume=40,258 cf
Runoff Depth=0.49"
Flow Length=1,210'
Tc=57.0 min
CN=70
4.64 cfs
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 5HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E1: Pre. East WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.03 0.00 0.00
2.00 0.06 0.00 0.00
3.00 0.09 0.00 0.00
4.00 0.12 0.00 0.00
5.00 0.16 0.00 0.00
6.00 0.21 0.00 0.00
7.00 0.26 0.00 0.00
8.00 0.31 0.00 0.00
9.00 0.38 0.00 0.00
10.00 0.47 0.00 0.00
11.00 0.61 0.00 0.00
12.00 1.71 0.14 0.18
13.00 1.99 0.24 3.70
14.00 2.12 0.29 1.45
15.00 2.20 0.32 0.90
16.00 2.27 0.35 0.72
17.00 2.33 0.38 0.59
18.00 2.38 0.40 0.53
19.00 2.42 0.42 0.47
20.00 2.46 0.43 0.41
21.00 2.49 0.45 0.36
22.00 2.52 0.47 0.35
23.00 2.55 0.48 0.34
24.00 2.58 0.49 0.33
25.00 2.58 0.49 0.10
26.00 2.58 0.49 0.01
27.00 2.58 0.49 0.00
28.00 2.58 0.49 0.00
29.00 2.58 0.49 0.00
30.00 2.58 0.49 0.00
31.00 2.58 0.49 0.00
32.00 2.58 0.49 0.00
33.00 2.58 0.49 0.00
34.00 2.58 0.49 0.00
35.00 2.58 0.49 0.00
36.00 2.58 0.49 0.00
37.00 2.58 0.49 0.00
38.00 2.58 0.49 0.00
39.00 2.58 0.49 0.00
40.00 2.58 0.49 0.00
41.00 2.58 0.49 0.00
42.00 2.58 0.49 0.00
43.00 2.58 0.49 0.00
44.00 2.58 0.49 0.00
45.00 2.58 0.49 0.00
46.00 2.58 0.49 0.00
47.00 2.58 0.49 0.00
48.00 2.58 0.49 0.00
49.00 2.58 0.49 0.00
50.00 2.58 0.49 0.00
51.00 2.58 0.49 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 2.58 0.49 0.00
53.00 2.58 0.49 0.00
54.00 2.58 0.49 0.00
55.00 2.58 0.49 0.00
56.00 2.58 0.49 0.00
57.00 2.58 0.49 0.00
58.00 2.58 0.49 0.00
59.00 2.58 0.49 0.00
60.00 2.58 0.49 0.00
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 6HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E1-A: Pre. East WS to BMP
Runoff = 3.89 cfs @ 12.70 hrs, Volume= 33,802 cf, Depth= 0.49"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Type II 24-hr 1 yr Rainfall=2.58"
Area (ac) CN Description
18.850 70 Woods, Good, HSG C
18.850 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
49.7 270 0.0185 0.09 Sheet Flow, East-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
7.3 940 0.0176 2.14 Shallow Concentrated Flow, West Shallow
Unpaved Kv= 16.1 fps
57.0 1,210 Total
Subcatchment E1-A: Pre. East WS to BMP
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)4
3
2
1
0
Type II 24-hr
1 yr Rainfall=2.58"
Runoff Area=18.850 ac
Runoff Volume=33,802 cf
Runoff Depth=0.49"
Flow Length=1,210'
Tc=57.0 min
CN=70
3.89 cfs
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 7HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E1-A: Pre. East WS to BMP
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.03 0.00 0.00
2.00 0.06 0.00 0.00
3.00 0.09 0.00 0.00
4.00 0.12 0.00 0.00
5.00 0.16 0.00 0.00
6.00 0.21 0.00 0.00
7.00 0.26 0.00 0.00
8.00 0.31 0.00 0.00
9.00 0.38 0.00 0.00
10.00 0.47 0.00 0.00
11.00 0.61 0.00 0.00
12.00 1.71 0.14 0.16
13.00 1.99 0.24 3.11
14.00 2.12 0.29 1.22
15.00 2.20 0.32 0.76
16.00 2.27 0.35 0.60
17.00 2.33 0.38 0.50
18.00 2.38 0.40 0.44
19.00 2.42 0.42 0.40
20.00 2.46 0.43 0.35
21.00 2.49 0.45 0.30
22.00 2.52 0.47 0.29
23.00 2.55 0.48 0.28
24.00 2.58 0.49 0.27
25.00 2.58 0.49 0.08
26.00 2.58 0.49 0.01
27.00 2.58 0.49 0.00
28.00 2.58 0.49 0.00
29.00 2.58 0.49 0.00
30.00 2.58 0.49 0.00
31.00 2.58 0.49 0.00
32.00 2.58 0.49 0.00
33.00 2.58 0.49 0.00
34.00 2.58 0.49 0.00
35.00 2.58 0.49 0.00
36.00 2.58 0.49 0.00
37.00 2.58 0.49 0.00
38.00 2.58 0.49 0.00
39.00 2.58 0.49 0.00
40.00 2.58 0.49 0.00
41.00 2.58 0.49 0.00
42.00 2.58 0.49 0.00
43.00 2.58 0.49 0.00
44.00 2.58 0.49 0.00
45.00 2.58 0.49 0.00
46.00 2.58 0.49 0.00
47.00 2.58 0.49 0.00
48.00 2.58 0.49 0.00
49.00 2.58 0.49 0.00
50.00 2.58 0.49 0.00
51.00 2.58 0.49 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 2.58 0.49 0.00
53.00 2.58 0.49 0.00
54.00 2.58 0.49 0.00
55.00 2.58 0.49 0.00
56.00 2.58 0.49 0.00
57.00 2.58 0.49 0.00
58.00 2.58 0.49 0.00
59.00 2.58 0.49 0.00
60.00 2.58 0.49 0.00
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 8HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E2: East Post
Runoff = 10.61 cfs @ 12.39 hrs, Volume= 57,495 cf, Depth= 0.84"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Type II 24-hr 1 yr Rainfall=2.58"
Area (ac) CN Description
0.320 70 Woods, Good, HSG C
* 0.390 98 Retention Ponds
* 17.410 78 Residential, 45% imp, HSG C
0.730 80 1/2 acre lots, 25% imp, HSG C
18.850 78 Weighted Average
10.443 55.40% Pervious Area
8.407 44.60% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
32.3 164 0.0200 0.08 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
6.8 1,511 0.0050 3.72 4.57 Pipe Channel, Storm Sewer
15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31'
n= 0.013
39.1 1,675 Total
Subcatchment E2: East Post
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)11
10
9
8
7
6
5
4
3
2
1
0
Type II 24-hr
1 yr Rainfall=2.58"
Runoff Area=18.850 ac
Runoff Volume=57,495 cf
Runoff Depth=0.84"
Flow Length=1,675'
Tc=39.1 min
CN=78
10.61 cfs
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 9HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E2: East Post
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.03 0.00 0.00
2.00 0.06 0.00 0.00
3.00 0.09 0.00 0.00
4.00 0.12 0.00 0.00
5.00 0.16 0.00 0.00
6.00 0.21 0.00 0.00
7.00 0.26 0.00 0.00
8.00 0.31 0.00 0.00
9.00 0.38 0.00 0.00
10.00 0.47 0.00 0.00
11.00 0.61 0.00 0.00
12.00 1.71 0.33 2.36
13.00 1.99 0.48 3.83
14.00 2.12 0.55 1.45
15.00 2.20 0.60 1.00
16.00 2.27 0.64 0.81
17.00 2.33 0.68 0.67
18.00 2.38 0.71 0.60
19.00 2.42 0.74 0.53
20.00 2.46 0.76 0.45
21.00 2.49 0.78 0.41
22.00 2.52 0.80 0.39
23.00 2.55 0.82 0.38
24.00 2.58 0.84 0.36
25.00 2.58 0.84 0.03
26.00 2.58 0.84 0.00
27.00 2.58 0.84 0.00
28.00 2.58 0.84 0.00
29.00 2.58 0.84 0.00
30.00 2.58 0.84 0.00
31.00 2.58 0.84 0.00
32.00 2.58 0.84 0.00
33.00 2.58 0.84 0.00
34.00 2.58 0.84 0.00
35.00 2.58 0.84 0.00
36.00 2.58 0.84 0.00
37.00 2.58 0.84 0.00
38.00 2.58 0.84 0.00
39.00 2.58 0.84 0.00
40.00 2.58 0.84 0.00
41.00 2.58 0.84 0.00
42.00 2.58 0.84 0.00
43.00 2.58 0.84 0.00
44.00 2.58 0.84 0.00
45.00 2.58 0.84 0.00
46.00 2.58 0.84 0.00
47.00 2.58 0.84 0.00
48.00 2.58 0.84 0.00
49.00 2.58 0.84 0.00
50.00 2.58 0.84 0.00
51.00 2.58 0.84 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 2.58 0.84 0.00
53.00 2.58 0.84 0.00
54.00 2.58 0.84 0.00
55.00 2.58 0.84 0.00
56.00 2.58 0.84 0.00
57.00 2.58 0.84 0.00
58.00 2.58 0.84 0.00
59.00 2.58 0.84 0.00
60.00 2.58 0.84 0.00
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 10HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E3: East Onsite Bypass
Runoff = 2.40 cfs @ 12.01 hrs, Volume= 5,900 cf, Depth= 0.49"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Type II 24-hr 1 yr Rainfall=2.58"
Area (ac) CN Description
3.290 70 Woods, Good, HSG C
3.290 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
7.5 Direct Entry, Direct Discharge
Subcatchment E3: East Onsite Bypass
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)2
1
0
Type II 24-hr
1 yr Rainfall=2.58"
Runoff Area=3.290 ac
Runoff Volume=5,900 cf
Runoff Depth=0.49"
Tc=7.5 min
CN=70
2.40 cfs
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 11HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E3: East Onsite Bypass
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.03 0.00 0.00
2.00 0.06 0.00 0.00
3.00 0.09 0.00 0.00
4.00 0.12 0.00 0.00
5.00 0.16 0.00 0.00
6.00 0.21 0.00 0.00
7.00 0.26 0.00 0.00
8.00 0.31 0.00 0.00
9.00 0.38 0.00 0.00
10.00 0.47 0.00 0.00
11.00 0.61 0.00 0.00
12.00 1.71 0.14 2.39
13.00 1.99 0.24 0.21
14.00 2.12 0.29 0.13
15.00 2.20 0.32 0.11
16.00 2.27 0.35 0.09
17.00 2.33 0.38 0.08
18.00 2.38 0.40 0.07
19.00 2.42 0.42 0.06
20.00 2.46 0.43 0.05
21.00 2.49 0.45 0.05
22.00 2.52 0.47 0.05
23.00 2.55 0.48 0.05
24.00 2.58 0.49 0.05
25.00 2.58 0.49 0.00
26.00 2.58 0.49 0.00
27.00 2.58 0.49 0.00
28.00 2.58 0.49 0.00
29.00 2.58 0.49 0.00
30.00 2.58 0.49 0.00
31.00 2.58 0.49 0.00
32.00 2.58 0.49 0.00
33.00 2.58 0.49 0.00
34.00 2.58 0.49 0.00
35.00 2.58 0.49 0.00
36.00 2.58 0.49 0.00
37.00 2.58 0.49 0.00
38.00 2.58 0.49 0.00
39.00 2.58 0.49 0.00
40.00 2.58 0.49 0.00
41.00 2.58 0.49 0.00
42.00 2.58 0.49 0.00
43.00 2.58 0.49 0.00
44.00 2.58 0.49 0.00
45.00 2.58 0.49 0.00
46.00 2.58 0.49 0.00
47.00 2.58 0.49 0.00
48.00 2.58 0.49 0.00
49.00 2.58 0.49 0.00
50.00 2.58 0.49 0.00
51.00 2.58 0.49 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 2.58 0.49 0.00
53.00 2.58 0.49 0.00
54.00 2.58 0.49 0.00
55.00 2.58 0.49 0.00
56.00 2.58 0.49 0.00
57.00 2.58 0.49 0.00
58.00 2.58 0.49 0.00
59.00 2.58 0.49 0.00
60.00 2.58 0.49 0.00
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 12HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W1: Pre. West WS
Runoff = 4.16 cfs @ 12.12 hrs, Volume= 15,045 cf, Depth= 0.49"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Type II 24-hr 1 yr Rainfall=2.58"
Area (ac) CN Description
8.390 70 Woods, Good, HSG C
8.390 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
11.6 50 0.0243 0.07 Sheet Flow, West-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
2.1 328 0.0270 2.65 Shallow Concentrated Flow, West Shallow1
Unpaved Kv= 16.1 fps
2.8 540 0.0396 3.20 Shallow Concentrated Flow, W-Shallow2
Unpaved Kv= 16.1 fps
16.5 918 Total
Subcatchment W1: Pre. West WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)4
3
2
1
0
Type II 24-hr
1 yr Rainfall=2.58"
Runoff Area=8.390 ac
Runoff Volume=15,045 cf
Runoff Depth=0.49"
Flow Length=918'
Tc=16.5 min
CN=70
4.16 cfs
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 13HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W1: Pre. West WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.03 0.00 0.00
2.00 0.06 0.00 0.00
3.00 0.09 0.00 0.00
4.00 0.12 0.00 0.00
5.00 0.16 0.00 0.00
6.00 0.21 0.00 0.00
7.00 0.26 0.00 0.00
8.00 0.31 0.00 0.00
9.00 0.38 0.00 0.00
10.00 0.47 0.00 0.00
11.00 0.61 0.00 0.00
12.00 1.71 0.14 2.33
13.00 1.99 0.24 0.60
14.00 2.12 0.29 0.36
15.00 2.20 0.32 0.29
16.00 2.27 0.35 0.23
17.00 2.33 0.38 0.20
18.00 2.38 0.40 0.18
19.00 2.42 0.42 0.16
20.00 2.46 0.43 0.14
21.00 2.49 0.45 0.13
22.00 2.52 0.47 0.13
23.00 2.55 0.48 0.12
24.00 2.58 0.49 0.12
25.00 2.58 0.49 0.00
26.00 2.58 0.49 0.00
27.00 2.58 0.49 0.00
28.00 2.58 0.49 0.00
29.00 2.58 0.49 0.00
30.00 2.58 0.49 0.00
31.00 2.58 0.49 0.00
32.00 2.58 0.49 0.00
33.00 2.58 0.49 0.00
34.00 2.58 0.49 0.00
35.00 2.58 0.49 0.00
36.00 2.58 0.49 0.00
37.00 2.58 0.49 0.00
38.00 2.58 0.49 0.00
39.00 2.58 0.49 0.00
40.00 2.58 0.49 0.00
41.00 2.58 0.49 0.00
42.00 2.58 0.49 0.00
43.00 2.58 0.49 0.00
44.00 2.58 0.49 0.00
45.00 2.58 0.49 0.00
46.00 2.58 0.49 0.00
47.00 2.58 0.49 0.00
48.00 2.58 0.49 0.00
49.00 2.58 0.49 0.00
50.00 2.58 0.49 0.00
51.00 2.58 0.49 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 2.58 0.49 0.00
53.00 2.58 0.49 0.00
54.00 2.58 0.49 0.00
55.00 2.58 0.49 0.00
56.00 2.58 0.49 0.00
57.00 2.58 0.49 0.00
58.00 2.58 0.49 0.00
59.00 2.58 0.49 0.00
60.00 2.58 0.49 0.00
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 14HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W1-A: Pre. West WS
Runoff = 2.08 cfs @ 12.12 hrs, Volume= 7,514 cf, Depth= 0.49"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Type II 24-hr 1 yr Rainfall=2.58"
Area (ac) CN Description
4.190 70 Woods, Good, HSG C
4.190 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
11.6 50 0.0243 0.07 Sheet Flow, West-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
2.1 328 0.0270 2.65 Shallow Concentrated Flow, West Shallow1
Unpaved Kv= 16.1 fps
2.8 540 0.0396 3.20 Shallow Concentrated Flow, W-Shallow2
Unpaved Kv= 16.1 fps
16.5 918 Total
Subcatchment W1-A: Pre. West WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)2
1
0
Type II 24-hr
1 yr Rainfall=2.58"
Runoff Area=4.190 ac
Runoff Volume=7,514 cf
Runoff Depth=0.49"
Flow Length=918'
Tc=16.5 min
CN=70
2.08 cfs
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 15HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W1-A: Pre. West WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.03 0.00 0.00
2.00 0.06 0.00 0.00
3.00 0.09 0.00 0.00
4.00 0.12 0.00 0.00
5.00 0.16 0.00 0.00
6.00 0.21 0.00 0.00
7.00 0.26 0.00 0.00
8.00 0.31 0.00 0.00
9.00 0.38 0.00 0.00
10.00 0.47 0.00 0.00
11.00 0.61 0.00 0.00
12.00 1.71 0.14 1.16
13.00 1.99 0.24 0.30
14.00 2.12 0.29 0.18
15.00 2.20 0.32 0.14
16.00 2.27 0.35 0.12
17.00 2.33 0.38 0.10
18.00 2.38 0.40 0.09
19.00 2.42 0.42 0.08
20.00 2.46 0.43 0.07
21.00 2.49 0.45 0.07
22.00 2.52 0.47 0.06
23.00 2.55 0.48 0.06
24.00 2.58 0.49 0.06
25.00 2.58 0.49 0.00
26.00 2.58 0.49 0.00
27.00 2.58 0.49 0.00
28.00 2.58 0.49 0.00
29.00 2.58 0.49 0.00
30.00 2.58 0.49 0.00
31.00 2.58 0.49 0.00
32.00 2.58 0.49 0.00
33.00 2.58 0.49 0.00
34.00 2.58 0.49 0.00
35.00 2.58 0.49 0.00
36.00 2.58 0.49 0.00
37.00 2.58 0.49 0.00
38.00 2.58 0.49 0.00
39.00 2.58 0.49 0.00
40.00 2.58 0.49 0.00
41.00 2.58 0.49 0.00
42.00 2.58 0.49 0.00
43.00 2.58 0.49 0.00
44.00 2.58 0.49 0.00
45.00 2.58 0.49 0.00
46.00 2.58 0.49 0.00
47.00 2.58 0.49 0.00
48.00 2.58 0.49 0.00
49.00 2.58 0.49 0.00
50.00 2.58 0.49 0.00
51.00 2.58 0.49 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 2.58 0.49 0.00
53.00 2.58 0.49 0.00
54.00 2.58 0.49 0.00
55.00 2.58 0.49 0.00
56.00 2.58 0.49 0.00
57.00 2.58 0.49 0.00
58.00 2.58 0.49 0.00
59.00 2.58 0.49 0.00
60.00 2.58 0.49 0.00
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 16HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W3: West Onsite Bypass
Runoff = 1.33 cfs @ 12.32 hrs, Volume= 7,532 cf, Depth= 0.49"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Type II 24-hr 1 yr Rainfall=2.58"
Area (ac) CN Description
4.200 70 Woods, Good, HSG C
4.200 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.5 264 0.0550 0.14 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
Subcatchment W3: West Onsite Bypass
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)1
0
Type II 24-hr
1 yr Rainfall=2.58"
Runoff Area=4.200 ac
Runoff Volume=7,532 cf
Runoff Depth=0.49"
Flow Length=264'
Slope=0.0550 '/'
Tc=31.5 min
CN=70
1.33 cfs
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 17HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W3: West Onsite Bypass
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.03 0.00 0.00
2.00 0.06 0.00 0.00
3.00 0.09 0.00 0.00
4.00 0.12 0.00 0.00
5.00 0.16 0.00 0.00
6.00 0.21 0.00 0.00
7.00 0.26 0.00 0.00
8.00 0.31 0.00 0.00
9.00 0.38 0.00 0.00
10.00 0.47 0.00 0.00
11.00 0.61 0.00 0.00
12.00 1.71 0.14 0.22
13.00 1.99 0.24 0.42
14.00 2.12 0.29 0.20
15.00 2.20 0.32 0.15
16.00 2.27 0.35 0.12
17.00 2.33 0.38 0.10
18.00 2.38 0.40 0.09
19.00 2.42 0.42 0.08
20.00 2.46 0.43 0.07
21.00 2.49 0.45 0.07
22.00 2.52 0.47 0.06
23.00 2.55 0.48 0.06
24.00 2.58 0.49 0.06
25.00 2.58 0.49 0.00
26.00 2.58 0.49 0.00
27.00 2.58 0.49 0.00
28.00 2.58 0.49 0.00
29.00 2.58 0.49 0.00
30.00 2.58 0.49 0.00
31.00 2.58 0.49 0.00
32.00 2.58 0.49 0.00
33.00 2.58 0.49 0.00
34.00 2.58 0.49 0.00
35.00 2.58 0.49 0.00
36.00 2.58 0.49 0.00
37.00 2.58 0.49 0.00
38.00 2.58 0.49 0.00
39.00 2.58 0.49 0.00
40.00 2.58 0.49 0.00
41.00 2.58 0.49 0.00
42.00 2.58 0.49 0.00
43.00 2.58 0.49 0.00
44.00 2.58 0.49 0.00
45.00 2.58 0.49 0.00
46.00 2.58 0.49 0.00
47.00 2.58 0.49 0.00
48.00 2.58 0.49 0.00
49.00 2.58 0.49 0.00
50.00 2.58 0.49 0.00
51.00 2.58 0.49 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 2.58 0.49 0.00
53.00 2.58 0.49 0.00
54.00 2.58 0.49 0.00
55.00 2.58 0.49 0.00
56.00 2.58 0.49 0.00
57.00 2.58 0.49 0.00
58.00 2.58 0.49 0.00
59.00 2.58 0.49 0.00
60.00 2.58 0.49 0.00
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 18HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Pond 1P: West Basin
Inflow Area = 182,604 sf, 49.90% Impervious, Inflow Depth = 1.31" for 1 yr event
Inflow = 9.13 cfs @ 11.99 hrs, Volume= 19,921 cf
Outflow = 0.35 cfs @ 13.86 hrs, Volume= 11,878 cf, Atten= 96%, Lag= 111.9 min
Primary = 0.35 cfs @ 13.86 hrs, Volume= 11,878 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Peak Elev= 638.69' @ 13.86 hrs Surf.Area= 11,987 sf Storage= 12,561 cf
Plug-Flow detention time= 719.8 min calculated for 11,878 cf (60% of inflow)
Center-of-Mass det. time= 604.1 min ( 1,434.6 - 830.5 )
Volume Invert Avail.Storage Storage Description
#1 637.50' 67,620 cf Custom Stage Data (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
637.50 7,400 0 0
638.00 11,122 4,631 4,631
639.00 12,383 11,753 16,383
640.00 16,772 14,578 30,961
641.00 18,330 17,551 48,512
642.00 19,887 19,109 67,620
Device Routing Invert Outlet Devices
#1 Primary 636.70'24.0" Round Culvert
L= 40.9' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 636.70' / 636.50' S= 0.0049 '/' Cc= 0.900
n= 0.013, Flow Area= 3.14 sf
#2 Device 1 637.50'1.0" Vert. Orifice/Grate C= 0.600
#3 Device 1 638.55'24.0" W x 9.0" H Vert. Orifice/Grate C= 0.600
#4 Secondary 641.50'10.0' 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
Primary OutFlow Max=0.35 cfs @ 13.86 hrs HW=638.69' (Free Discharge)
1=Culvert (Passes 0.35 cfs of 12.20 cfs potential flow)
2=Orifice/Grate (Orifice Controls 0.03 cfs @ 5.15 fps)
3=Orifice/Grate (Orifice Controls 0.32 cfs @ 1.19 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=637.50' (Free Discharge)
4=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 19HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Pond 1P: West Basin
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)10
9
8
7
6
5
4
3
2
1
0
Inflow Area=182,604 sf
Peak Elev=638.69'
Storage=12,561 cf
9.13 cfs
0.35 cfs
0.35 cfs
0.00 cfs
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 20HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Pond 1P: West Basin
Time
(hours)
Inflow
(cfs)
Storage
(cubic-feet)
Elevation
(feet)
Outflow
(cfs)
Primary
(cfs)
Secondary
(cfs)
0.00 0.00 0 637.50 0.00 0.00 0.00
2.50 0.00 0 637.50 0.00 0.00 0.00
5.00 0.00 0 637.50 0.00 0.00 0.00
7.50 0.00 0 637.50 0.00 0.00 0.00
10.00 0.06 144 637.52 0.00 0.00 0.00
12.50 0.91 11,295 638.58 0.06 0.06 0.00
15.00 0.26 12,411 638.67 0.31 0.31 0.00
17.50 0.17 12,000 638.64 0.20 0.20 0.00
20.00 0.12 11,755 638.62 0.15 0.15 0.00
22.50 0.11 11,596 638.61 0.12 0.12 0.00
25.00 0.00 11,288 638.58 0.06 0.06 0.00
27.50 0.00 10,927 638.55 0.03 0.03 0.00
30.00 0.00 10,691 638.53 0.03 0.03 0.00
32.50 0.00 10,458 638.51 0.03 0.03 0.00
35.00 0.00 10,226 638.49 0.03 0.03 0.00
37.50 0.00 9,997 638.47 0.03 0.03 0.00
40.00 0.00 9,771 638.45 0.03 0.03 0.00
42.50 0.00 9,547 638.43 0.02 0.02 0.00
45.00 0.00 9,325 638.41 0.02 0.02 0.00
47.50 0.00 9,106 638.39 0.02 0.02 0.00
50.00 0.00 8,889 638.37 0.02 0.02 0.00
52.50 0.00 8,674 638.36 0.02 0.02 0.00
55.00 0.00 8,462 638.34 0.02 0.02 0.00
57.50 0.00 8,252 638.32 0.02 0.02 0.00
60.00 0.00 8,045 638.30 0.02 0.02 0.00
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 21HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Pond 5P: Prop Retention Pond East
Inflow Area = 821,106 sf, 44.60% Impervious, Inflow Depth = 0.84" for 1 yr event
Inflow = 10.61 cfs @ 12.39 hrs, Volume= 57,495 cf
Outflow = 0.15 cfs @ 24.61 hrs, Volume= 23,431 cf, Atten= 99%, Lag= 733.4 min
Primary = 0.15 cfs @ 24.61 hrs, Volume= 23,431 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Tertiary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Peak Elev= 636.60' @ 24.61 hrs Surf.Area= 27,558 sf Storage= 51,296 cf
Plug-Flow detention time= 1,404.3 min calculated for 23,431 cf (41% of inflow)
Center-of-Mass det. time= 1,258.6 min ( 2,147.7 - 889.1 )
Volume Invert Avail.Storage Storage Description
#1 634.50' 161,487 cf East Wet Ponds (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
634.50 19,267 0 0
635.00 23,340 10,652 10,652
636.00 25,936 24,638 35,290
637.00 28,646 27,291 62,581
638.00 31,469 30,058 92,638
639.00 34,391 32,930 125,568
640.00 37,447 35,919 161,487
Device Routing Invert Outlet Devices
#1 Primary 634.50'2.0" Vert. Orifice/Grate C= 0.600
#2 Secondary 637.68'24.0" W x 9.0" H Vert. Orifice/Grate X 4.00 C= 0.600
#3 Tertiary 639.50'10.0' 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
Primary OutFlow Max=0.15 cfs @ 24.61 hrs HW=636.60' (Free Discharge)
1=Orifice/Grate (Orifice Controls 0.15 cfs @ 6.84 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=634.50' (Free Discharge)
2=Orifice/Grate ( Controls 0.00 cfs)
Tertiary OutFlow Max=0.00 cfs @ 0.00 hrs HW=634.50' (Free Discharge)
3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 22HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Pond 5P: Prop Retention Pond East
Inflow
Outflow
Primary
Secondary
Tertiary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)11
10
9
8
7
6
5
4
3
2
1
0
Inflow Area=821,106 sf
Peak Elev=636.60'
Storage=51,296 cf
10.61 cfs
0.15 cfs
0.15 cfs
0.00 cfs
0.00 cfs
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 23HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Pond 5P: Prop Retention Pond East
Time
(hours)
Inflow
(cfs)
Storage
(cubic-feet)
Elevation
(feet)
Outflow
(cfs)
Primary
(cfs)
Secondary
(cfs)
Tertiary
(cfs)
0.00 0.00 0 634.50 0.00 0.00 0.00 0.00
2.50 0.00 0 634.50 0.00 0.00 0.00 0.00
5.00 0.00 0 634.50 0.00 0.00 0.00 0.00
7.50 0.00 0 634.50 0.00 0.00 0.00 0.00
10.00 0.00 0 634.50 0.00 0.00 0.00 0.00
12.50 9.80 15,309 635.20 0.08 0.08 0.00 0.00
15.00 1.00 37,958 636.10 0.13 0.13 0.00 0.00
17.50 0.63 43,777 636.32 0.14 0.14 0.00 0.00
20.00 0.45 47,403 636.46 0.14 0.14 0.00 0.00
22.50 0.38 49,752 636.54 0.15 0.15 0.00 0.00
25.00 0.03 51,196 636.59 0.15 0.15 0.00 0.00
27.50 0.00 49,893 636.55 0.15 0.15 0.00 0.00
30.00 0.00 48,576 636.50 0.15 0.15 0.00 0.00
32.50 0.00 47,276 636.45 0.14 0.14 0.00 0.00
35.00 0.00 45,992 636.40 0.14 0.14 0.00 0.00
37.50 0.00 44,725 636.36 0.14 0.14 0.00 0.00
40.00 0.00 43,474 636.31 0.14 0.14 0.00 0.00
42.50 0.00 42,240 636.26 0.14 0.14 0.00 0.00
45.00 0.00 41,022 636.22 0.13 0.13 0.00 0.00
47.50 0.00 39,822 636.17 0.13 0.13 0.00 0.00
50.00 0.00 38,638 636.13 0.13 0.13 0.00 0.00
52.50 0.00 37,472 636.08 0.13 0.13 0.00 0.00
55.00 0.00 36,322 636.04 0.13 0.13 0.00 0.00
57.50 0.00 35,190 636.00 0.12 0.12 0.00 0.00
60.00 0.00 34,075 635.95 0.12 0.12 0.00 0.00
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 24HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Link 1L: (new Link)
Inflow Area = 365,556 sf, 24.93% Impervious, Inflow Depth > 0.64" for 1 yr event
Inflow = 1.36 cfs @ 12.32 hrs, Volume= 19,409 cf
Primary = 1.36 cfs @ 12.32 hrs, Volume= 19,409 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Link 1L: (new Link)
Inflow
Primary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)1
0
Inflow Area=365,556 sf
1.36 cfs
1.36 cfs
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 25HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Link 1L: (new Link)
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
0.00 0.00 0.00 0.00
1.00 0.00 0.00 0.00
2.00 0.00 0.00 0.00
3.00 0.00 0.00 0.00
4.00 0.00 0.00 0.00
5.00 0.00 0.00 0.00
6.00 0.00 0.00 0.00
7.00 0.00 0.00 0.00
8.00 0.00 0.00 0.00
9.00 0.00 0.00 0.00
10.00 0.00 0.00 0.00
11.00 0.00 0.00 0.00
12.00 0.24 0.00 0.24
13.00 0.67 0.00 0.67
14.00 0.56 0.00 0.56
15.00 0.46 0.00 0.46
16.00 0.38 0.00 0.38
17.00 0.32 0.00 0.32
18.00 0.28 0.00 0.28
19.00 0.25 0.00 0.25
20.00 0.22 0.00 0.22
21.00 0.20 0.00 0.20
22.00 0.18 0.00 0.18
23.00 0.17 0.00 0.17
24.00 0.17 0.00 0.17
25.00 0.06 0.00 0.06
26.00 0.04 0.00 0.04
27.00 0.03 0.00 0.03
28.00 0.03 0.00 0.03
29.00 0.03 0.00 0.03
30.00 0.03 0.00 0.03
31.00 0.03 0.00 0.03
32.00 0.03 0.00 0.03
33.00 0.03 0.00 0.03
34.00 0.03 0.00 0.03
35.00 0.03 0.00 0.03
36.00 0.03 0.00 0.03
37.00 0.03 0.00 0.03
38.00 0.03 0.00 0.03
39.00 0.03 0.00 0.03
40.00 0.03 0.00 0.03
41.00 0.02 0.00 0.02
42.00 0.02 0.00 0.02
43.00 0.02 0.00 0.02
44.00 0.02 0.00 0.02
45.00 0.02 0.00 0.02
46.00 0.02 0.00 0.02
47.00 0.02 0.00 0.02
48.00 0.02 0.00 0.02
49.00 0.02 0.00 0.02
50.00 0.02 0.00 0.02
51.00 0.02 0.00 0.02
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
52.00 0.02 0.00 0.02
53.00 0.02 0.00 0.02
54.00 0.02 0.00 0.02
55.00 0.02 0.00 0.02
56.00 0.02 0.00 0.02
57.00 0.02 0.00 0.02
58.00 0.02 0.00 0.02
59.00 0.02 0.00 0.02
60.00 0.02 0.00 0.02
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 26HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Link 6L: East Post Comb
Inflow Area = 964,418 sf, 37.97% Impervious, Inflow Depth > 0.36" for 1 yr event
Inflow = 2.40 cfs @ 12.01 hrs, Volume= 29,331 cf
Primary = 2.40 cfs @ 12.01 hrs, Volume= 29,331 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Link 6L: East Post Comb
Inflow
Primary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)2
1
0
Inflow Area=964,418 sf
2.40 cfs
2.40 cfs
Type II 24-hr 1 yr Rainfall=2.58"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 27HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Link 6L: East Post Comb
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
0.00 0.00 0.00 0.00
1.00 0.00 0.00 0.00
2.00 0.00 0.00 0.00
3.00 0.00 0.00 0.00
4.00 0.00 0.00 0.00
5.00 0.00 0.00 0.00
6.00 0.00 0.00 0.00
7.00 0.00 0.00 0.00
8.00 0.00 0.00 0.00
9.00 0.00 0.00 0.00
10.00 0.00 0.00 0.00
11.00 0.00 0.00 0.00
12.00 2.40 0.00 2.40
13.00 0.32 0.00 0.32
14.00 0.26 0.00 0.26
15.00 0.24 0.00 0.24
16.00 0.22 0.00 0.22
17.00 0.22 0.00 0.22
18.00 0.21 0.00 0.21
19.00 0.20 0.00 0.20
20.00 0.20 0.00 0.20
21.00 0.20 0.00 0.20
22.00 0.20 0.00 0.20
23.00 0.20 0.00 0.20
24.00 0.20 0.00 0.20
25.00 0.15 0.00 0.15
26.00 0.15 0.00 0.15
27.00 0.15 0.00 0.15
28.00 0.15 0.00 0.15
29.00 0.15 0.00 0.15
30.00 0.15 0.00 0.15
31.00 0.14 0.00 0.14
32.00 0.14 0.00 0.14
33.00 0.14 0.00 0.14
34.00 0.14 0.00 0.14
35.00 0.14 0.00 0.14
36.00 0.14 0.00 0.14
37.00 0.14 0.00 0.14
38.00 0.14 0.00 0.14
39.00 0.14 0.00 0.14
40.00 0.14 0.00 0.14
41.00 0.14 0.00 0.14
42.00 0.14 0.00 0.14
43.00 0.14 0.00 0.14
44.00 0.14 0.00 0.14
45.00 0.13 0.00 0.13
46.00 0.13 0.00 0.13
47.00 0.13 0.00 0.13
48.00 0.13 0.00 0.13
49.00 0.13 0.00 0.13
50.00 0.13 0.00 0.13
51.00 0.13 0.00 0.13
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
52.00 0.13 0.00 0.13
53.00 0.13 0.00 0.13
54.00 0.13 0.00 0.13
55.00 0.13 0.00 0.13
56.00 0.13 0.00 0.13
57.00 0.13 0.00 0.13
58.00 0.12 0.00 0.12
59.00 0.12 0.00 0.12
60.00 0.12 0.00 0.12
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 28HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment 3S: West Post
Runoff = 9.17 cfs @ 3.19 hrs, Volume= 16,225 cf, Depth= 1.07"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr Rainfall=2.28"
Area (ac) CN Description
2.092 98 Paved parking, HSG C
2.100 74 >75% Grass cover, Good, HSG C
4.192 86 Weighted Average
2.100 50.10% Pervious Area
2.092 49.90% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
7.5 Direct Entry, Min Tc
Subcatchment 3S: West Post
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)10
9
8
7
6
5
4
3
2
1
0
Charlotte 6-hr 2-yr
Rainfall=2.28"
Runoff Area=4.192 ac
Runoff Volume=16,225 cf
Runoff Depth=1.07"
Tc=7.5 min
CN=86
9.17 cfs
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 29HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment 3S: West Post
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.09 0.00 0.00
2.00 0.25 0.00 0.00
3.00 0.89 0.14 1.92
4.00 2.01 0.86 0.91
5.00 2.18 0.99 0.41
6.00 2.28 1.07 0.30
7.00 2.28 1.07 0.00
8.00 2.28 1.07 0.00
9.00 2.28 1.07 0.00
10.00 2.28 1.07 0.00
11.00 2.28 1.07 0.00
12.00 2.28 1.07 0.00
13.00 2.28 1.07 0.00
14.00 2.28 1.07 0.00
15.00 2.28 1.07 0.00
16.00 2.28 1.07 0.00
17.00 2.28 1.07 0.00
18.00 2.28 1.07 0.00
19.00 2.28 1.07 0.00
20.00 2.28 1.07 0.00
21.00 2.28 1.07 0.00
22.00 2.28 1.07 0.00
23.00 2.28 1.07 0.00
24.00 2.28 1.07 0.00
25.00 2.28 1.07 0.00
26.00 2.28 1.07 0.00
27.00 2.28 1.07 0.00
28.00 2.28 1.07 0.00
29.00 2.28 1.07 0.00
30.00 2.28 1.07 0.00
31.00 2.28 1.07 0.00
32.00 2.28 1.07 0.00
33.00 2.28 1.07 0.00
34.00 2.28 1.07 0.00
35.00 2.28 1.07 0.00
36.00 2.28 1.07 0.00
37.00 2.28 1.07 0.00
38.00 2.28 1.07 0.00
39.00 2.28 1.07 0.00
40.00 2.28 1.07 0.00
41.00 2.28 1.07 0.00
42.00 2.28 1.07 0.00
43.00 2.28 1.07 0.00
44.00 2.28 1.07 0.00
45.00 2.28 1.07 0.00
46.00 2.28 1.07 0.00
47.00 2.28 1.07 0.00
48.00 2.28 1.07 0.00
49.00 2.28 1.07 0.00
50.00 2.28 1.07 0.00
51.00 2.28 1.07 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 2.28 1.07 0.00
53.00 2.28 1.07 0.00
54.00 2.28 1.07 0.00
55.00 2.28 1.07 0.00
56.00 2.28 1.07 0.00
57.00 2.28 1.07 0.00
58.00 2.28 1.07 0.00
59.00 2.28 1.07 0.00
60.00 2.28 1.07 0.00
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 30HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E1: Pre. East WS
Runoff = 4.93 cfs @ 4.01 hrs, Volume= 28,901 cf, Depth= 0.35"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr Rainfall=2.28"
Area (ac) CN Description
22.450 70 Woods, Good, HSG C
22.450 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
49.7 270 0.0185 0.09 Sheet Flow, East-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
7.3 940 0.0176 2.14 Shallow Concentrated Flow, West Shallow
Unpaved Kv= 16.1 fps
57.0 1,210 Total
Subcatchment E1: Pre. East WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)5
4
3
2
1
0
Charlotte 6-hr 2-yr
Rainfall=2.28"
Runoff Area=22.450 ac
Runoff Volume=28,901 cf
Runoff Depth=0.35"
Flow Length=1,210'
Tc=57.0 min
CN=70
4.93 cfs
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 31HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E1: Pre. East WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.09 0.00 0.00
2.00 0.25 0.00 0.00
3.00 0.89 0.00 0.00
4.00 2.01 0.24 4.92
5.00 2.18 0.31 2.19
6.00 2.28 0.35 1.17
7.00 2.28 0.35 0.30
8.00 2.28 0.35 0.02
9.00 2.28 0.35 0.00
10.00 2.28 0.35 0.00
11.00 2.28 0.35 0.00
12.00 2.28 0.35 0.00
13.00 2.28 0.35 0.00
14.00 2.28 0.35 0.00
15.00 2.28 0.35 0.00
16.00 2.28 0.35 0.00
17.00 2.28 0.35 0.00
18.00 2.28 0.35 0.00
19.00 2.28 0.35 0.00
20.00 2.28 0.35 0.00
21.00 2.28 0.35 0.00
22.00 2.28 0.35 0.00
23.00 2.28 0.35 0.00
24.00 2.28 0.35 0.00
25.00 2.28 0.35 0.00
26.00 2.28 0.35 0.00
27.00 2.28 0.35 0.00
28.00 2.28 0.35 0.00
29.00 2.28 0.35 0.00
30.00 2.28 0.35 0.00
31.00 2.28 0.35 0.00
32.00 2.28 0.35 0.00
33.00 2.28 0.35 0.00
34.00 2.28 0.35 0.00
35.00 2.28 0.35 0.00
36.00 2.28 0.35 0.00
37.00 2.28 0.35 0.00
38.00 2.28 0.35 0.00
39.00 2.28 0.35 0.00
40.00 2.28 0.35 0.00
41.00 2.28 0.35 0.00
42.00 2.28 0.35 0.00
43.00 2.28 0.35 0.00
44.00 2.28 0.35 0.00
45.00 2.28 0.35 0.00
46.00 2.28 0.35 0.00
47.00 2.28 0.35 0.00
48.00 2.28 0.35 0.00
49.00 2.28 0.35 0.00
50.00 2.28 0.35 0.00
51.00 2.28 0.35 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 2.28 0.35 0.00
53.00 2.28 0.35 0.00
54.00 2.28 0.35 0.00
55.00 2.28 0.35 0.00
56.00 2.28 0.35 0.00
57.00 2.28 0.35 0.00
58.00 2.28 0.35 0.00
59.00 2.28 0.35 0.00
60.00 2.28 0.35 0.00
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 32HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E1-A: Pre. East WS to BMP
Runoff = 4.14 cfs @ 4.01 hrs, Volume= 24,267 cf, Depth= 0.35"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr Rainfall=2.28"
Area (ac) CN Description
18.850 70 Woods, Good, HSG C
18.850 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
49.7 270 0.0185 0.09 Sheet Flow, East-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
7.3 940 0.0176 2.14 Shallow Concentrated Flow, West Shallow
Unpaved Kv= 16.1 fps
57.0 1,210 Total
Subcatchment E1-A: Pre. East WS to BMP
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)4
3
2
1
0
Charlotte 6-hr 2-yr
Rainfall=2.28"
Runoff Area=18.850 ac
Runoff Volume=24,267 cf
Runoff Depth=0.35"
Flow Length=1,210'
Tc=57.0 min
CN=70
4.14 cfs
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 33HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E1-A: Pre. East WS to BMP
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.09 0.00 0.00
2.00 0.25 0.00 0.00
3.00 0.89 0.00 0.00
4.00 2.01 0.24 4.13
5.00 2.18 0.31 1.84
6.00 2.28 0.35 0.98
7.00 2.28 0.35 0.25
8.00 2.28 0.35 0.02
9.00 2.28 0.35 0.00
10.00 2.28 0.35 0.00
11.00 2.28 0.35 0.00
12.00 2.28 0.35 0.00
13.00 2.28 0.35 0.00
14.00 2.28 0.35 0.00
15.00 2.28 0.35 0.00
16.00 2.28 0.35 0.00
17.00 2.28 0.35 0.00
18.00 2.28 0.35 0.00
19.00 2.28 0.35 0.00
20.00 2.28 0.35 0.00
21.00 2.28 0.35 0.00
22.00 2.28 0.35 0.00
23.00 2.28 0.35 0.00
24.00 2.28 0.35 0.00
25.00 2.28 0.35 0.00
26.00 2.28 0.35 0.00
27.00 2.28 0.35 0.00
28.00 2.28 0.35 0.00
29.00 2.28 0.35 0.00
30.00 2.28 0.35 0.00
31.00 2.28 0.35 0.00
32.00 2.28 0.35 0.00
33.00 2.28 0.35 0.00
34.00 2.28 0.35 0.00
35.00 2.28 0.35 0.00
36.00 2.28 0.35 0.00
37.00 2.28 0.35 0.00
38.00 2.28 0.35 0.00
39.00 2.28 0.35 0.00
40.00 2.28 0.35 0.00
41.00 2.28 0.35 0.00
42.00 2.28 0.35 0.00
43.00 2.28 0.35 0.00
44.00 2.28 0.35 0.00
45.00 2.28 0.35 0.00
46.00 2.28 0.35 0.00
47.00 2.28 0.35 0.00
48.00 2.28 0.35 0.00
49.00 2.28 0.35 0.00
50.00 2.28 0.35 0.00
51.00 2.28 0.35 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 2.28 0.35 0.00
53.00 2.28 0.35 0.00
54.00 2.28 0.35 0.00
55.00 2.28 0.35 0.00
56.00 2.28 0.35 0.00
57.00 2.28 0.35 0.00
58.00 2.28 0.35 0.00
59.00 2.28 0.35 0.00
60.00 2.28 0.35 0.00
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 34HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E2: East Post
Runoff = 10.82 cfs @ 3.66 hrs, Volume= 44,411 cf, Depth= 0.65"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr Rainfall=2.28"
Area (ac) CN Description
0.320 70 Woods, Good, HSG C
* 0.390 98 Retention Ponds
* 17.410 78 Residential, 45% imp, HSG C
0.730 80 1/2 acre lots, 25% imp, HSG C
18.850 78 Weighted Average
10.443 55.40% Pervious Area
8.407 44.60% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
32.3 164 0.0200 0.08 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
6.8 1,511 0.0050 3.72 4.57 Pipe Channel, Storm Sewer
15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31'
n= 0.013
39.1 1,675 Total
Subcatchment E2: East Post
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)12
11
10
9
8
7
6
5
4
3
2
1
0
Charlotte 6-hr 2-yr
Rainfall=2.28"
Runoff Area=18.850 ac
Runoff Volume=44,411 cf
Runoff Depth=0.65"
Flow Length=1,675'
Tc=39.1 min
CN=78
10.82 cfs
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 35HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E2: East Post
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.09 0.00 0.00
2.00 0.25 0.00 0.00
3.00 0.89 0.03 0.03
4.00 2.01 0.49 7.16
5.00 2.18 0.59 2.10
6.00 2.28 0.65 1.21
7.00 2.28 0.65 0.10
8.00 2.28 0.65 0.00
9.00 2.28 0.65 0.00
10.00 2.28 0.65 0.00
11.00 2.28 0.65 0.00
12.00 2.28 0.65 0.00
13.00 2.28 0.65 0.00
14.00 2.28 0.65 0.00
15.00 2.28 0.65 0.00
16.00 2.28 0.65 0.00
17.00 2.28 0.65 0.00
18.00 2.28 0.65 0.00
19.00 2.28 0.65 0.00
20.00 2.28 0.65 0.00
21.00 2.28 0.65 0.00
22.00 2.28 0.65 0.00
23.00 2.28 0.65 0.00
24.00 2.28 0.65 0.00
25.00 2.28 0.65 0.00
26.00 2.28 0.65 0.00
27.00 2.28 0.65 0.00
28.00 2.28 0.65 0.00
29.00 2.28 0.65 0.00
30.00 2.28 0.65 0.00
31.00 2.28 0.65 0.00
32.00 2.28 0.65 0.00
33.00 2.28 0.65 0.00
34.00 2.28 0.65 0.00
35.00 2.28 0.65 0.00
36.00 2.28 0.65 0.00
37.00 2.28 0.65 0.00
38.00 2.28 0.65 0.00
39.00 2.28 0.65 0.00
40.00 2.28 0.65 0.00
41.00 2.28 0.65 0.00
42.00 2.28 0.65 0.00
43.00 2.28 0.65 0.00
44.00 2.28 0.65 0.00
45.00 2.28 0.65 0.00
46.00 2.28 0.65 0.00
47.00 2.28 0.65 0.00
48.00 2.28 0.65 0.00
49.00 2.28 0.65 0.00
50.00 2.28 0.65 0.00
51.00 2.28 0.65 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 2.28 0.65 0.00
53.00 2.28 0.65 0.00
54.00 2.28 0.65 0.00
55.00 2.28 0.65 0.00
56.00 2.28 0.65 0.00
57.00 2.28 0.65 0.00
58.00 2.28 0.65 0.00
59.00 2.28 0.65 0.00
60.00 2.28 0.65 0.00
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 36HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E3: East Onsite Bypass
Runoff = 1.91 cfs @ 3.23 hrs, Volume= 4,235 cf, Depth= 0.35"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr Rainfall=2.28"
Area (ac) CN Description
3.290 70 Woods, Good, HSG C
3.290 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
7.5 Direct Entry, Direct Discharge
Subcatchment E3: East Onsite Bypass
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)2
1
0
Charlotte 6-hr 2-yr
Rainfall=2.28"
Runoff Area=3.290 ac
Runoff Volume=4,235 cf
Runoff Depth=0.35"
Tc=7.5 min
CN=70
1.91 cfs
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 37HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E3: East Onsite Bypass
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.09 0.00 0.00
2.00 0.25 0.00 0.00
3.00 0.89 0.00 0.00
4.00 2.01 0.24 0.35
5.00 2.18 0.31 0.17
6.00 2.28 0.35 0.13
7.00 2.28 0.35 0.00
8.00 2.28 0.35 0.00
9.00 2.28 0.35 0.00
10.00 2.28 0.35 0.00
11.00 2.28 0.35 0.00
12.00 2.28 0.35 0.00
13.00 2.28 0.35 0.00
14.00 2.28 0.35 0.00
15.00 2.28 0.35 0.00
16.00 2.28 0.35 0.00
17.00 2.28 0.35 0.00
18.00 2.28 0.35 0.00
19.00 2.28 0.35 0.00
20.00 2.28 0.35 0.00
21.00 2.28 0.35 0.00
22.00 2.28 0.35 0.00
23.00 2.28 0.35 0.00
24.00 2.28 0.35 0.00
25.00 2.28 0.35 0.00
26.00 2.28 0.35 0.00
27.00 2.28 0.35 0.00
28.00 2.28 0.35 0.00
29.00 2.28 0.35 0.00
30.00 2.28 0.35 0.00
31.00 2.28 0.35 0.00
32.00 2.28 0.35 0.00
33.00 2.28 0.35 0.00
34.00 2.28 0.35 0.00
35.00 2.28 0.35 0.00
36.00 2.28 0.35 0.00
37.00 2.28 0.35 0.00
38.00 2.28 0.35 0.00
39.00 2.28 0.35 0.00
40.00 2.28 0.35 0.00
41.00 2.28 0.35 0.00
42.00 2.28 0.35 0.00
43.00 2.28 0.35 0.00
44.00 2.28 0.35 0.00
45.00 2.28 0.35 0.00
46.00 2.28 0.35 0.00
47.00 2.28 0.35 0.00
48.00 2.28 0.35 0.00
49.00 2.28 0.35 0.00
50.00 2.28 0.35 0.00
51.00 2.28 0.35 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 2.28 0.35 0.00
53.00 2.28 0.35 0.00
54.00 2.28 0.35 0.00
55.00 2.28 0.35 0.00
56.00 2.28 0.35 0.00
57.00 2.28 0.35 0.00
58.00 2.28 0.35 0.00
59.00 2.28 0.35 0.00
60.00 2.28 0.35 0.00
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 38HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W1: Pre. West WS
Runoff = 3.65 cfs @ 3.37 hrs, Volume= 10,801 cf, Depth= 0.35"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr Rainfall=2.28"
Area (ac) CN Description
8.390 70 Woods, Good, HSG C
8.390 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
11.6 50 0.0243 0.07 Sheet Flow, West-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
2.1 328 0.0270 2.65 Shallow Concentrated Flow, West Shallow1
Unpaved Kv= 16.1 fps
2.8 540 0.0396 3.20 Shallow Concentrated Flow, W-Shallow2
Unpaved Kv= 16.1 fps
16.5 918 Total
Subcatchment W1: Pre. West WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)4
3
2
1
0
Charlotte 6-hr 2-yr
Rainfall=2.28"
Runoff Area=8.390 ac
Runoff Volume=10,801 cf
Runoff Depth=0.35"
Flow Length=918'
Tc=16.5 min
CN=70
3.65 cfs
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 39HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W1: Pre. West WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.09 0.00 0.00
2.00 0.25 0.00 0.00
3.00 0.89 0.00 0.00
4.00 2.01 0.24 1.05
5.00 2.18 0.31 0.47
6.00 2.28 0.35 0.35
7.00 2.28 0.35 0.00
8.00 2.28 0.35 0.00
9.00 2.28 0.35 0.00
10.00 2.28 0.35 0.00
11.00 2.28 0.35 0.00
12.00 2.28 0.35 0.00
13.00 2.28 0.35 0.00
14.00 2.28 0.35 0.00
15.00 2.28 0.35 0.00
16.00 2.28 0.35 0.00
17.00 2.28 0.35 0.00
18.00 2.28 0.35 0.00
19.00 2.28 0.35 0.00
20.00 2.28 0.35 0.00
21.00 2.28 0.35 0.00
22.00 2.28 0.35 0.00
23.00 2.28 0.35 0.00
24.00 2.28 0.35 0.00
25.00 2.28 0.35 0.00
26.00 2.28 0.35 0.00
27.00 2.28 0.35 0.00
28.00 2.28 0.35 0.00
29.00 2.28 0.35 0.00
30.00 2.28 0.35 0.00
31.00 2.28 0.35 0.00
32.00 2.28 0.35 0.00
33.00 2.28 0.35 0.00
34.00 2.28 0.35 0.00
35.00 2.28 0.35 0.00
36.00 2.28 0.35 0.00
37.00 2.28 0.35 0.00
38.00 2.28 0.35 0.00
39.00 2.28 0.35 0.00
40.00 2.28 0.35 0.00
41.00 2.28 0.35 0.00
42.00 2.28 0.35 0.00
43.00 2.28 0.35 0.00
44.00 2.28 0.35 0.00
45.00 2.28 0.35 0.00
46.00 2.28 0.35 0.00
47.00 2.28 0.35 0.00
48.00 2.28 0.35 0.00
49.00 2.28 0.35 0.00
50.00 2.28 0.35 0.00
51.00 2.28 0.35 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 2.28 0.35 0.00
53.00 2.28 0.35 0.00
54.00 2.28 0.35 0.00
55.00 2.28 0.35 0.00
56.00 2.28 0.35 0.00
57.00 2.28 0.35 0.00
58.00 2.28 0.35 0.00
59.00 2.28 0.35 0.00
60.00 2.28 0.35 0.00
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 40HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W1-A: Pre. West WS
Runoff = 1.82 cfs @ 3.37 hrs, Volume= 5,394 cf, Depth= 0.35"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr Rainfall=2.28"
Area (ac) CN Description
4.190 70 Woods, Good, HSG C
4.190 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
11.6 50 0.0243 0.07 Sheet Flow, West-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
2.1 328 0.0270 2.65 Shallow Concentrated Flow, West Shallow1
Unpaved Kv= 16.1 fps
2.8 540 0.0396 3.20 Shallow Concentrated Flow, W-Shallow2
Unpaved Kv= 16.1 fps
16.5 918 Total
Subcatchment W1-A: Pre. West WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)2
1
0
Charlotte 6-hr 2-yr
Rainfall=2.28"
Runoff Area=4.190 ac
Runoff Volume=5,394 cf
Runoff Depth=0.35"
Flow Length=918'
Tc=16.5 min
CN=70
1.82 cfs
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 41HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W1-A: Pre. West WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.09 0.00 0.00
2.00 0.25 0.00 0.00
3.00 0.89 0.00 0.00
4.00 2.01 0.24 0.52
5.00 2.18 0.31 0.24
6.00 2.28 0.35 0.17
7.00 2.28 0.35 0.00
8.00 2.28 0.35 0.00
9.00 2.28 0.35 0.00
10.00 2.28 0.35 0.00
11.00 2.28 0.35 0.00
12.00 2.28 0.35 0.00
13.00 2.28 0.35 0.00
14.00 2.28 0.35 0.00
15.00 2.28 0.35 0.00
16.00 2.28 0.35 0.00
17.00 2.28 0.35 0.00
18.00 2.28 0.35 0.00
19.00 2.28 0.35 0.00
20.00 2.28 0.35 0.00
21.00 2.28 0.35 0.00
22.00 2.28 0.35 0.00
23.00 2.28 0.35 0.00
24.00 2.28 0.35 0.00
25.00 2.28 0.35 0.00
26.00 2.28 0.35 0.00
27.00 2.28 0.35 0.00
28.00 2.28 0.35 0.00
29.00 2.28 0.35 0.00
30.00 2.28 0.35 0.00
31.00 2.28 0.35 0.00
32.00 2.28 0.35 0.00
33.00 2.28 0.35 0.00
34.00 2.28 0.35 0.00
35.00 2.28 0.35 0.00
36.00 2.28 0.35 0.00
37.00 2.28 0.35 0.00
38.00 2.28 0.35 0.00
39.00 2.28 0.35 0.00
40.00 2.28 0.35 0.00
41.00 2.28 0.35 0.00
42.00 2.28 0.35 0.00
43.00 2.28 0.35 0.00
44.00 2.28 0.35 0.00
45.00 2.28 0.35 0.00
46.00 2.28 0.35 0.00
47.00 2.28 0.35 0.00
48.00 2.28 0.35 0.00
49.00 2.28 0.35 0.00
50.00 2.28 0.35 0.00
51.00 2.28 0.35 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 2.28 0.35 0.00
53.00 2.28 0.35 0.00
54.00 2.28 0.35 0.00
55.00 2.28 0.35 0.00
56.00 2.28 0.35 0.00
57.00 2.28 0.35 0.00
58.00 2.28 0.35 0.00
59.00 2.28 0.35 0.00
60.00 2.28 0.35 0.00
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 42HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W3: West Onsite Bypass
Runoff = 1.31 cfs @ 3.61 hrs, Volume= 5,407 cf, Depth= 0.35"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr Rainfall=2.28"
Area (ac) CN Description
4.200 70 Woods, Good, HSG C
4.200 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.5 264 0.0550 0.14 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
Subcatchment W3: West Onsite Bypass
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)1
0
Charlotte 6-hr 2-yr
Rainfall=2.28"
Runoff Area=4.200 ac
Runoff Volume=5,407 cf
Runoff Depth=0.35"
Flow Length=264'
Slope=0.0550 '/'
Tc=31.5 min
CN=70
1.31 cfs
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 43HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W3: West Onsite Bypass
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.09 0.00 0.00
2.00 0.25 0.00 0.00
3.00 0.89 0.00 0.00
4.00 2.01 0.24 0.78
5.00 2.18 0.31 0.28
6.00 2.28 0.35 0.18
7.00 2.28 0.35 0.01
8.00 2.28 0.35 0.00
9.00 2.28 0.35 0.00
10.00 2.28 0.35 0.00
11.00 2.28 0.35 0.00
12.00 2.28 0.35 0.00
13.00 2.28 0.35 0.00
14.00 2.28 0.35 0.00
15.00 2.28 0.35 0.00
16.00 2.28 0.35 0.00
17.00 2.28 0.35 0.00
18.00 2.28 0.35 0.00
19.00 2.28 0.35 0.00
20.00 2.28 0.35 0.00
21.00 2.28 0.35 0.00
22.00 2.28 0.35 0.00
23.00 2.28 0.35 0.00
24.00 2.28 0.35 0.00
25.00 2.28 0.35 0.00
26.00 2.28 0.35 0.00
27.00 2.28 0.35 0.00
28.00 2.28 0.35 0.00
29.00 2.28 0.35 0.00
30.00 2.28 0.35 0.00
31.00 2.28 0.35 0.00
32.00 2.28 0.35 0.00
33.00 2.28 0.35 0.00
34.00 2.28 0.35 0.00
35.00 2.28 0.35 0.00
36.00 2.28 0.35 0.00
37.00 2.28 0.35 0.00
38.00 2.28 0.35 0.00
39.00 2.28 0.35 0.00
40.00 2.28 0.35 0.00
41.00 2.28 0.35 0.00
42.00 2.28 0.35 0.00
43.00 2.28 0.35 0.00
44.00 2.28 0.35 0.00
45.00 2.28 0.35 0.00
46.00 2.28 0.35 0.00
47.00 2.28 0.35 0.00
48.00 2.28 0.35 0.00
49.00 2.28 0.35 0.00
50.00 2.28 0.35 0.00
51.00 2.28 0.35 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 2.28 0.35 0.00
53.00 2.28 0.35 0.00
54.00 2.28 0.35 0.00
55.00 2.28 0.35 0.00
56.00 2.28 0.35 0.00
57.00 2.28 0.35 0.00
58.00 2.28 0.35 0.00
59.00 2.28 0.35 0.00
60.00 2.28 0.35 0.00
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 44HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Pond 1P: West Basin
Inflow Area = 182,604 sf, 49.90% Impervious, Inflow Depth = 1.07" for 2-yr event
Inflow = 9.17 cfs @ 3.19 hrs, Volume= 16,225 cf
Outflow = 0.49 cfs @ 4.71 hrs, Volume= 9,489 cf, Atten= 95%, Lag= 91.1 min
Primary = 0.49 cfs @ 4.71 hrs, Volume= 9,489 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Peak Elev= 638.72' @ 4.71 hrs Surf.Area= 12,032 sf Storage= 12,988 cf
Plug-Flow detention time= 917.8 min calculated for 9,481 cf (58% of inflow)
Center-of-Mass det. time= 892.2 min ( 1,110.4 - 218.2 )
Volume Invert Avail.Storage Storage Description
#1 637.50' 67,620 cf Custom Stage Data (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
637.50 7,400 0 0
638.00 11,122 4,631 4,631
639.00 12,383 11,753 16,383
640.00 16,772 14,578 30,961
641.00 18,330 17,551 48,512
642.00 19,887 19,109 67,620
Device Routing Invert Outlet Devices
#1 Primary 636.70'24.0" Round Culvert
L= 40.9' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 636.70' / 636.50' S= 0.0049 '/' Cc= 0.900
n= 0.013, Flow Area= 3.14 sf
#2 Device 1 637.50'1.0" Vert. Orifice/Grate C= 0.600
#3 Device 1 638.55'24.0" W x 9.0" H Vert. Orifice/Grate C= 0.600
#4 Secondary 641.50'10.0' 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
Primary OutFlow Max=0.49 cfs @ 4.71 hrs HW=638.72' (Free Discharge)
1=Culvert (Passes 0.49 cfs of 12.51 cfs potential flow)
2=Orifice/Grate (Orifice Controls 0.03 cfs @ 5.23 fps)
3=Orifice/Grate (Orifice Controls 0.46 cfs @ 1.33 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=637.50' (Free Discharge)
4=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 45HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Pond 1P: West Basin
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)10
9
8
7
6
5
4
3
2
1
0
Inflow Area=182,604 sf
Peak Elev=638.72'
Storage=12,988 cf
9.17 cfs
0.49 cfs
0.49 cfs
0.00 cfs
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 46HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Pond 1P: West Basin
Time
(hours)
Inflow
(cfs)
Storage
(cubic-feet)
Elevation
(feet)
Outflow
(cfs)
Primary
(cfs)
Secondary
(cfs)
0.00 0.00 0 637.50 0.00 0.00 0.00
2.50 0.05 11 637.50 0.00 0.00 0.00
5.00 0.41 12,952 638.72 0.47 0.47 0.00
7.50 0.00 11,590 638.60 0.12 0.12 0.00
10.00 0.00 11,036 638.56 0.04 0.04 0.00
12.50 0.00 10,785 638.54 0.03 0.03 0.00
15.00 0.00 10,551 638.52 0.03 0.03 0.00
17.50 0.00 10,318 638.50 0.03 0.03 0.00
20.00 0.00 10,088 638.48 0.03 0.03 0.00
22.50 0.00 9,861 638.46 0.03 0.03 0.00
25.00 0.00 9,636 638.44 0.02 0.02 0.00
27.50 0.00 9,413 638.42 0.02 0.02 0.00
30.00 0.00 9,193 638.40 0.02 0.02 0.00
32.50 0.00 8,975 638.38 0.02 0.02 0.00
35.00 0.00 8,760 638.36 0.02 0.02 0.00
37.50 0.00 8,546 638.35 0.02 0.02 0.00
40.00 0.00 8,336 638.33 0.02 0.02 0.00
42.50 0.00 8,128 638.31 0.02 0.02 0.00
45.00 0.00 7,922 638.29 0.02 0.02 0.00
47.50 0.00 7,718 638.27 0.02 0.02 0.00
50.00 0.00 7,517 638.26 0.02 0.02 0.00
52.50 0.00 7,319 638.24 0.02 0.02 0.00
55.00 0.00 7,123 638.22 0.02 0.02 0.00
57.50 0.00 6,929 638.20 0.02 0.02 0.00
60.00 0.00 6,738 638.19 0.02 0.02 0.00
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 47HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Pond 5P: Prop Retention Pond East
Inflow Area = 821,106 sf, 44.60% Impervious, Inflow Depth = 0.65" for 2-yr event
Inflow = 10.82 cfs @ 3.66 hrs, Volume= 44,411 cf
Outflow = 0.14 cfs @ 6.92 hrs, Volume= 23,833 cf, Atten= 99%, Lag= 195.4 min
Primary = 0.14 cfs @ 6.92 hrs, Volume= 23,833 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Tertiary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Peak Elev= 636.28' @ 6.92 hrs Surf.Area= 26,708 sf Storage= 42,787 cf
Plug-Flow detention time= 1,592.3 min calculated for 23,813 cf (54% of inflow)
Center-of-Mass det. time= 1,558.6 min ( 1,814.1 - 255.5 )
Volume Invert Avail.Storage Storage Description
#1 634.50' 161,487 cf East Wet Ponds (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
634.50 19,267 0 0
635.00 23,340 10,652 10,652
636.00 25,936 24,638 35,290
637.00 28,646 27,291 62,581
638.00 31,469 30,058 92,638
639.00 34,391 32,930 125,568
640.00 37,447 35,919 161,487
Device Routing Invert Outlet Devices
#1 Primary 634.50'2.0" Vert. Orifice/Grate C= 0.600
#2 Secondary 637.68'24.0" W x 9.0" H Vert. Orifice/Grate X 4.00 C= 0.600
#3 Tertiary 639.50'10.0' 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
Primary OutFlow Max=0.14 cfs @ 6.92 hrs HW=636.28' (Free Discharge)
1=Orifice/Grate (Orifice Controls 0.14 cfs @ 6.28 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=634.50' (Free Discharge)
2=Orifice/Grate ( Controls 0.00 cfs)
Tertiary OutFlow Max=0.00 cfs @ 0.00 hrs HW=634.50' (Free Discharge)
3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 48HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Pond 5P: Prop Retention Pond East
Inflow
Outflow
Primary
Secondary
Tertiary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)12
11
10
9
8
7
6
5
4
3
2
1
0
Inflow Area=821,106 sf
Peak Elev=636.28'
Storage=42,787 cf
10.82 cfs
0.14 cfs
0.14 cfs
0.00 cfs
0.00 cfs
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 49HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Pond 5P: Prop Retention Pond East
Time
(hours)
Inflow
(cfs)
Storage
(cubic-feet)
Elevation
(feet)
Outflow
(cfs)
Primary
(cfs)
Secondary
(cfs)
Tertiary
(cfs)
0.00 0.00 0 634.50 0.00 0.00 0.00 0.00
2.50 0.00 0 634.50 0.00 0.00 0.00 0.00
5.00 2.10 35,856 636.02 0.13 0.13 0.00 0.00
7.50 0.01 42,617 636.28 0.14 0.14 0.00 0.00
10.00 0.00 41,404 636.23 0.13 0.13 0.00 0.00
12.50 0.00 40,199 636.19 0.13 0.13 0.00 0.00
15.00 0.00 39,010 636.14 0.13 0.13 0.00 0.00
17.50 0.00 37,838 636.10 0.13 0.13 0.00 0.00
20.00 0.00 36,683 636.05 0.13 0.13 0.00 0.00
22.50 0.00 35,545 636.01 0.13 0.13 0.00 0.00
25.00 0.00 34,425 635.97 0.12 0.12 0.00 0.00
27.50 0.00 33,321 635.92 0.12 0.12 0.00 0.00
30.00 0.00 32,236 635.88 0.12 0.12 0.00 0.00
32.50 0.00 31,167 635.84 0.12 0.12 0.00 0.00
35.00 0.00 30,116 635.80 0.12 0.12 0.00 0.00
37.50 0.00 29,083 635.76 0.11 0.11 0.00 0.00
40.00 0.00 28,067 635.72 0.11 0.11 0.00 0.00
42.50 0.00 27,069 635.68 0.11 0.11 0.00 0.00
45.00 0.00 26,089 635.64 0.11 0.11 0.00 0.00
47.50 0.00 25,127 635.60 0.11 0.11 0.00 0.00
50.00 0.00 24,183 635.56 0.10 0.10 0.00 0.00
52.50 0.00 23,256 635.52 0.10 0.10 0.00 0.00
55.00 0.00 22,348 635.49 0.10 0.10 0.00 0.00
57.50 0.00 21,458 635.45 0.10 0.10 0.00 0.00
60.00 0.00 20,587 635.42 0.10 0.10 0.00 0.00
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 50HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Link 1L: (new Link)
Inflow Area = 365,556 sf, 24.93% Impervious, Inflow Depth > 0.49" for 2-yr event
Inflow = 1.34 cfs @ 3.64 hrs, Volume= 14,896 cf
Primary = 1.34 cfs @ 3.64 hrs, Volume= 14,896 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Link 1L: (new Link)
Inflow
Primary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)1
0
Inflow Area=365,556 sf
1.34 cfs
1.34 cfs
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 51HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Link 1L: (new Link)
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
0.00 0.00 0.00 0.00
1.00 0.00 0.00 0.00
2.00 0.00 0.00 0.00
3.00 0.01 0.00 0.01
4.00 1.09 0.00 1.09
5.00 0.76 0.00 0.76
6.00 0.57 0.00 0.57
7.00 0.17 0.00 0.17
8.00 0.08 0.00 0.08
9.00 0.05 0.00 0.05
10.00 0.04 0.00 0.04
11.00 0.03 0.00 0.03
12.00 0.03 0.00 0.03
13.00 0.03 0.00 0.03
14.00 0.03 0.00 0.03
15.00 0.03 0.00 0.03
16.00 0.03 0.00 0.03
17.00 0.03 0.00 0.03
18.00 0.03 0.00 0.03
19.00 0.03 0.00 0.03
20.00 0.03 0.00 0.03
21.00 0.03 0.00 0.03
22.00 0.03 0.00 0.03
23.00 0.03 0.00 0.03
24.00 0.02 0.00 0.02
25.00 0.02 0.00 0.02
26.00 0.02 0.00 0.02
27.00 0.02 0.00 0.02
28.00 0.02 0.00 0.02
29.00 0.02 0.00 0.02
30.00 0.02 0.00 0.02
31.00 0.02 0.00 0.02
32.00 0.02 0.00 0.02
33.00 0.02 0.00 0.02
34.00 0.02 0.00 0.02
35.00 0.02 0.00 0.02
36.00 0.02 0.00 0.02
37.00 0.02 0.00 0.02
38.00 0.02 0.00 0.02
39.00 0.02 0.00 0.02
40.00 0.02 0.00 0.02
41.00 0.02 0.00 0.02
42.00 0.02 0.00 0.02
43.00 0.02 0.00 0.02
44.00 0.02 0.00 0.02
45.00 0.02 0.00 0.02
46.00 0.02 0.00 0.02
47.00 0.02 0.00 0.02
48.00 0.02 0.00 0.02
49.00 0.02 0.00 0.02
50.00 0.02 0.00 0.02
51.00 0.02 0.00 0.02
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
52.00 0.02 0.00 0.02
53.00 0.02 0.00 0.02
54.00 0.02 0.00 0.02
55.00 0.02 0.00 0.02
56.00 0.02 0.00 0.02
57.00 0.02 0.00 0.02
58.00 0.02 0.00 0.02
59.00 0.02 0.00 0.02
60.00 0.02 0.00 0.02
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 52HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Link 6L: East Post Comb
Inflow Area = 964,418 sf, 37.97% Impervious, Inflow Depth > 0.35" for 2-yr event
Inflow = 1.91 cfs @ 3.23 hrs, Volume= 28,068 cf
Primary = 1.91 cfs @ 3.23 hrs, Volume= 28,068 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Link 6L: East Post Comb
Inflow
Primary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)2
1
0
Inflow Area=964,418 sf
1.91 cfs
1.91 cfs
Charlotte 6-hr 2-yr Rainfall=2.28"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 53HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Link 6L: East Post Comb
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
0.00 0.00 0.00 0.00
1.00 0.00 0.00 0.00
2.00 0.00 0.00 0.00
3.00 0.00 0.00 0.00
4.00 0.45 0.00 0.45
5.00 0.30 0.00 0.30
6.00 0.26 0.00 0.26
7.00 0.14 0.00 0.14
8.00 0.14 0.00 0.14
9.00 0.14 0.00 0.14
10.00 0.13 0.00 0.13
11.00 0.13 0.00 0.13
12.00 0.13 0.00 0.13
13.00 0.13 0.00 0.13
14.00 0.13 0.00 0.13
15.00 0.13 0.00 0.13
16.00 0.13 0.00 0.13
17.00 0.13 0.00 0.13
18.00 0.13 0.00 0.13
19.00 0.13 0.00 0.13
20.00 0.13 0.00 0.13
21.00 0.13 0.00 0.13
22.00 0.13 0.00 0.13
23.00 0.13 0.00 0.13
24.00 0.12 0.00 0.12
25.00 0.12 0.00 0.12
26.00 0.12 0.00 0.12
27.00 0.12 0.00 0.12
28.00 0.12 0.00 0.12
29.00 0.12 0.00 0.12
30.00 0.12 0.00 0.12
31.00 0.12 0.00 0.12
32.00 0.12 0.00 0.12
33.00 0.12 0.00 0.12
34.00 0.12 0.00 0.12
35.00 0.12 0.00 0.12
36.00 0.12 0.00 0.12
37.00 0.11 0.00 0.11
38.00 0.11 0.00 0.11
39.00 0.11 0.00 0.11
40.00 0.11 0.00 0.11
41.00 0.11 0.00 0.11
42.00 0.11 0.00 0.11
43.00 0.11 0.00 0.11
44.00 0.11 0.00 0.11
45.00 0.11 0.00 0.11
46.00 0.11 0.00 0.11
47.00 0.11 0.00 0.11
48.00 0.11 0.00 0.11
49.00 0.10 0.00 0.10
50.00 0.10 0.00 0.10
51.00 0.10 0.00 0.10
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
52.00 0.10 0.00 0.10
53.00 0.10 0.00 0.10
54.00 0.10 0.00 0.10
55.00 0.10 0.00 0.10
56.00 0.10 0.00 0.10
57.00 0.10 0.00 0.10
58.00 0.10 0.00 0.10
59.00 0.10 0.00 0.10
60.00 0.10 0.00 0.10
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 54HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment 3S: West Post
Runoff = 17.61 cfs @ 3.19 hrs, Volume= 34,910 cf, Depth= 2.29"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 10-yr Rainfall=3.72"
Area (ac) CN Description
2.092 98 Paved parking, HSG C
2.100 74 >75% Grass cover, Good, HSG C
4.192 86 Weighted Average
2.100 50.10% Pervious Area
2.092 49.90% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
7.5 Direct Entry, Min Tc
Subcatchment 3S: West Post
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Charlotte 6-hr 10-yr
Rainfall=3.72"
Runoff Area=4.192 ac
Runoff Volume=34,910 cf
Runoff Depth=2.29"
Tc=7.5 min
CN=86
17.61 cfs
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 55HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment 3S: West Post
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.14 0.00 0.00
2.00 0.39 0.00 0.05
3.00 1.50 0.49 5.67
4.00 3.29 1.91 1.83
5.00 3.56 2.15 0.74
6.00 3.72 2.29 0.52
7.00 3.72 2.29 0.00
8.00 3.72 2.29 0.00
9.00 3.72 2.29 0.00
10.00 3.72 2.29 0.00
11.00 3.72 2.29 0.00
12.00 3.72 2.29 0.00
13.00 3.72 2.29 0.00
14.00 3.72 2.29 0.00
15.00 3.72 2.29 0.00
16.00 3.72 2.29 0.00
17.00 3.72 2.29 0.00
18.00 3.72 2.29 0.00
19.00 3.72 2.29 0.00
20.00 3.72 2.29 0.00
21.00 3.72 2.29 0.00
22.00 3.72 2.29 0.00
23.00 3.72 2.29 0.00
24.00 3.72 2.29 0.00
25.00 3.72 2.29 0.00
26.00 3.72 2.29 0.00
27.00 3.72 2.29 0.00
28.00 3.72 2.29 0.00
29.00 3.72 2.29 0.00
30.00 3.72 2.29 0.00
31.00 3.72 2.29 0.00
32.00 3.72 2.29 0.00
33.00 3.72 2.29 0.00
34.00 3.72 2.29 0.00
35.00 3.72 2.29 0.00
36.00 3.72 2.29 0.00
37.00 3.72 2.29 0.00
38.00 3.72 2.29 0.00
39.00 3.72 2.29 0.00
40.00 3.72 2.29 0.00
41.00 3.72 2.29 0.00
42.00 3.72 2.29 0.00
43.00 3.72 2.29 0.00
44.00 3.72 2.29 0.00
45.00 3.72 2.29 0.00
46.00 3.72 2.29 0.00
47.00 3.72 2.29 0.00
48.00 3.72 2.29 0.00
49.00 3.72 2.29 0.00
50.00 3.72 2.29 0.00
51.00 3.72 2.29 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 3.72 2.29 0.00
53.00 3.72 2.29 0.00
54.00 3.72 2.29 0.00
55.00 3.72 2.29 0.00
56.00 3.72 2.29 0.00
57.00 3.72 2.29 0.00
58.00 3.72 2.29 0.00
59.00 3.72 2.29 0.00
60.00 3.72 2.29 0.00
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 56HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E1: Pre. East WS
Runoff = 17.81 cfs @ 3.92 hrs, Volume= 93,434 cf, Depth= 1.15"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 10-yr Rainfall=3.72"
Area (ac) CN Description
22.450 70 Woods, Good, HSG C
22.450 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
49.7 270 0.0185 0.09 Sheet Flow, East-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
7.3 940 0.0176 2.14 Shallow Concentrated Flow, West Shallow
Unpaved Kv= 16.1 fps
57.0 1,210 Total
Subcatchment E1: Pre. East WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Charlotte 6-hr 10-yr
Rainfall=3.72"
Runoff Area=22.450 ac
Runoff Volume=93,434 cf
Runoff Depth=1.15"
Flow Length=1,210'
Tc=57.0 min
CN=70
17.81 cfs
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 57HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E1: Pre. East WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.14 0.00 0.00
2.00 0.39 0.00 0.00
3.00 1.50 0.08 0.05
4.00 3.29 0.88 17.57
5.00 3.56 1.05 6.09
6.00 3.72 1.15 2.80
7.00 3.72 1.15 0.68
8.00 3.72 1.15 0.05
9.00 3.72 1.15 0.00
10.00 3.72 1.15 0.00
11.00 3.72 1.15 0.00
12.00 3.72 1.15 0.00
13.00 3.72 1.15 0.00
14.00 3.72 1.15 0.00
15.00 3.72 1.15 0.00
16.00 3.72 1.15 0.00
17.00 3.72 1.15 0.00
18.00 3.72 1.15 0.00
19.00 3.72 1.15 0.00
20.00 3.72 1.15 0.00
21.00 3.72 1.15 0.00
22.00 3.72 1.15 0.00
23.00 3.72 1.15 0.00
24.00 3.72 1.15 0.00
25.00 3.72 1.15 0.00
26.00 3.72 1.15 0.00
27.00 3.72 1.15 0.00
28.00 3.72 1.15 0.00
29.00 3.72 1.15 0.00
30.00 3.72 1.15 0.00
31.00 3.72 1.15 0.00
32.00 3.72 1.15 0.00
33.00 3.72 1.15 0.00
34.00 3.72 1.15 0.00
35.00 3.72 1.15 0.00
36.00 3.72 1.15 0.00
37.00 3.72 1.15 0.00
38.00 3.72 1.15 0.00
39.00 3.72 1.15 0.00
40.00 3.72 1.15 0.00
41.00 3.72 1.15 0.00
42.00 3.72 1.15 0.00
43.00 3.72 1.15 0.00
44.00 3.72 1.15 0.00
45.00 3.72 1.15 0.00
46.00 3.72 1.15 0.00
47.00 3.72 1.15 0.00
48.00 3.72 1.15 0.00
49.00 3.72 1.15 0.00
50.00 3.72 1.15 0.00
51.00 3.72 1.15 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 3.72 1.15 0.00
53.00 3.72 1.15 0.00
54.00 3.72 1.15 0.00
55.00 3.72 1.15 0.00
56.00 3.72 1.15 0.00
57.00 3.72 1.15 0.00
58.00 3.72 1.15 0.00
59.00 3.72 1.15 0.00
60.00 3.72 1.15 0.00
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 58HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E1-A: Pre. East WS to BMP
Runoff = 14.95 cfs @ 3.92 hrs, Volume= 78,451 cf, Depth= 1.15"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 10-yr Rainfall=3.72"
Area (ac) CN Description
18.850 70 Woods, Good, HSG C
18.850 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
49.7 270 0.0185 0.09 Sheet Flow, East-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
7.3 940 0.0176 2.14 Shallow Concentrated Flow, West Shallow
Unpaved Kv= 16.1 fps
57.0 1,210 Total
Subcatchment E1-A: Pre. East WS to BMP
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Charlotte 6-hr 10-yr
Rainfall=3.72"
Runoff Area=18.850 ac
Runoff Volume=78,451 cf
Runoff Depth=1.15"
Flow Length=1,210'
Tc=57.0 min
CN=70
14.95 cfs
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 59HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E1-A: Pre. East WS to BMP
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.14 0.00 0.00
2.00 0.39 0.00 0.00
3.00 1.50 0.08 0.04
4.00 3.29 0.88 14.75
5.00 3.56 1.05 5.12
6.00 3.72 1.15 2.35
7.00 3.72 1.15 0.57
8.00 3.72 1.15 0.04
9.00 3.72 1.15 0.00
10.00 3.72 1.15 0.00
11.00 3.72 1.15 0.00
12.00 3.72 1.15 0.00
13.00 3.72 1.15 0.00
14.00 3.72 1.15 0.00
15.00 3.72 1.15 0.00
16.00 3.72 1.15 0.00
17.00 3.72 1.15 0.00
18.00 3.72 1.15 0.00
19.00 3.72 1.15 0.00
20.00 3.72 1.15 0.00
21.00 3.72 1.15 0.00
22.00 3.72 1.15 0.00
23.00 3.72 1.15 0.00
24.00 3.72 1.15 0.00
25.00 3.72 1.15 0.00
26.00 3.72 1.15 0.00
27.00 3.72 1.15 0.00
28.00 3.72 1.15 0.00
29.00 3.72 1.15 0.00
30.00 3.72 1.15 0.00
31.00 3.72 1.15 0.00
32.00 3.72 1.15 0.00
33.00 3.72 1.15 0.00
34.00 3.72 1.15 0.00
35.00 3.72 1.15 0.00
36.00 3.72 1.15 0.00
37.00 3.72 1.15 0.00
38.00 3.72 1.15 0.00
39.00 3.72 1.15 0.00
40.00 3.72 1.15 0.00
41.00 3.72 1.15 0.00
42.00 3.72 1.15 0.00
43.00 3.72 1.15 0.00
44.00 3.72 1.15 0.00
45.00 3.72 1.15 0.00
46.00 3.72 1.15 0.00
47.00 3.72 1.15 0.00
48.00 3.72 1.15 0.00
49.00 3.72 1.15 0.00
50.00 3.72 1.15 0.00
51.00 3.72 1.15 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 3.72 1.15 0.00
53.00 3.72 1.15 0.00
54.00 3.72 1.15 0.00
55.00 3.72 1.15 0.00
56.00 3.72 1.15 0.00
57.00 3.72 1.15 0.00
58.00 3.72 1.15 0.00
59.00 3.72 1.15 0.00
60.00 3.72 1.15 0.00
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 60HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E2: East Post
Runoff = 28.74 cfs @ 3.63 hrs, Volume= 114,031 cf, Depth= 1.67"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 10-yr Rainfall=3.72"
Area (ac) CN Description
0.320 70 Woods, Good, HSG C
* 0.390 98 Retention Ponds
* 17.410 78 Residential, 45% imp, HSG C
0.730 80 1/2 acre lots, 25% imp, HSG C
18.850 78 Weighted Average
10.443 55.40% Pervious Area
8.407 44.60% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
32.3 164 0.0200 0.08 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
6.8 1,511 0.0050 3.72 4.57 Pipe Channel, Storm Sewer
15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31'
n= 0.013
39.1 1,675 Total
Subcatchment E2: East Post
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Charlotte 6-hr 10-yr
Rainfall=3.72"
Runoff Area=18.850 ac
Runoff Volume=114,031 cf
Runoff Depth=1.67"
Flow Length=1,675'
Tc=39.1 min
CN=78
28.74 cfs
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 61HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E2: East Post
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.14 0.00 0.00
2.00 0.39 0.00 0.00
3.00 1.50 0.23 1.33
4.00 3.29 1.34 17.82
5.00 3.56 1.54 4.49
6.00 3.72 1.67 2.41
7.00 3.72 1.67 0.20
8.00 3.72 1.67 0.00
9.00 3.72 1.67 0.00
10.00 3.72 1.67 0.00
11.00 3.72 1.67 0.00
12.00 3.72 1.67 0.00
13.00 3.72 1.67 0.00
14.00 3.72 1.67 0.00
15.00 3.72 1.67 0.00
16.00 3.72 1.67 0.00
17.00 3.72 1.67 0.00
18.00 3.72 1.67 0.00
19.00 3.72 1.67 0.00
20.00 3.72 1.67 0.00
21.00 3.72 1.67 0.00
22.00 3.72 1.67 0.00
23.00 3.72 1.67 0.00
24.00 3.72 1.67 0.00
25.00 3.72 1.67 0.00
26.00 3.72 1.67 0.00
27.00 3.72 1.67 0.00
28.00 3.72 1.67 0.00
29.00 3.72 1.67 0.00
30.00 3.72 1.67 0.00
31.00 3.72 1.67 0.00
32.00 3.72 1.67 0.00
33.00 3.72 1.67 0.00
34.00 3.72 1.67 0.00
35.00 3.72 1.67 0.00
36.00 3.72 1.67 0.00
37.00 3.72 1.67 0.00
38.00 3.72 1.67 0.00
39.00 3.72 1.67 0.00
40.00 3.72 1.67 0.00
41.00 3.72 1.67 0.00
42.00 3.72 1.67 0.00
43.00 3.72 1.67 0.00
44.00 3.72 1.67 0.00
45.00 3.72 1.67 0.00
46.00 3.72 1.67 0.00
47.00 3.72 1.67 0.00
48.00 3.72 1.67 0.00
49.00 3.72 1.67 0.00
50.00 3.72 1.67 0.00
51.00 3.72 1.67 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 3.72 1.67 0.00
53.00 3.72 1.67 0.00
54.00 3.72 1.67 0.00
55.00 3.72 1.67 0.00
56.00 3.72 1.67 0.00
57.00 3.72 1.67 0.00
58.00 3.72 1.67 0.00
59.00 3.72 1.67 0.00
60.00 3.72 1.67 0.00
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 62HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E3: East Onsite Bypass
Runoff = 6.80 cfs @ 3.20 hrs, Volume= 13,692 cf, Depth= 1.15"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 10-yr Rainfall=3.72"
Area (ac) CN Description
3.290 70 Woods, Good, HSG C
3.290 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
7.5 Direct Entry, Direct Discharge
Subcatchment E3: East Onsite Bypass
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)7
6
5
4
3
2
1
0
Charlotte 6-hr 10-yr
Rainfall=3.72"
Runoff Area=3.290 ac
Runoff Volume=13,692 cf
Runoff Depth=1.15"
Tc=7.5 min
CN=70
6.80 cfs
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 63HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E3: East Onsite Bypass
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.14 0.00 0.00
2.00 0.39 0.00 0.00
3.00 1.50 0.08 1.03
4.00 3.29 0.88 0.97
5.00 3.56 1.05 0.41
6.00 3.72 1.15 0.29
7.00 3.72 1.15 0.00
8.00 3.72 1.15 0.00
9.00 3.72 1.15 0.00
10.00 3.72 1.15 0.00
11.00 3.72 1.15 0.00
12.00 3.72 1.15 0.00
13.00 3.72 1.15 0.00
14.00 3.72 1.15 0.00
15.00 3.72 1.15 0.00
16.00 3.72 1.15 0.00
17.00 3.72 1.15 0.00
18.00 3.72 1.15 0.00
19.00 3.72 1.15 0.00
20.00 3.72 1.15 0.00
21.00 3.72 1.15 0.00
22.00 3.72 1.15 0.00
23.00 3.72 1.15 0.00
24.00 3.72 1.15 0.00
25.00 3.72 1.15 0.00
26.00 3.72 1.15 0.00
27.00 3.72 1.15 0.00
28.00 3.72 1.15 0.00
29.00 3.72 1.15 0.00
30.00 3.72 1.15 0.00
31.00 3.72 1.15 0.00
32.00 3.72 1.15 0.00
33.00 3.72 1.15 0.00
34.00 3.72 1.15 0.00
35.00 3.72 1.15 0.00
36.00 3.72 1.15 0.00
37.00 3.72 1.15 0.00
38.00 3.72 1.15 0.00
39.00 3.72 1.15 0.00
40.00 3.72 1.15 0.00
41.00 3.72 1.15 0.00
42.00 3.72 1.15 0.00
43.00 3.72 1.15 0.00
44.00 3.72 1.15 0.00
45.00 3.72 1.15 0.00
46.00 3.72 1.15 0.00
47.00 3.72 1.15 0.00
48.00 3.72 1.15 0.00
49.00 3.72 1.15 0.00
50.00 3.72 1.15 0.00
51.00 3.72 1.15 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 3.72 1.15 0.00
53.00 3.72 1.15 0.00
54.00 3.72 1.15 0.00
55.00 3.72 1.15 0.00
56.00 3.72 1.15 0.00
57.00 3.72 1.15 0.00
58.00 3.72 1.15 0.00
59.00 3.72 1.15 0.00
60.00 3.72 1.15 0.00
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 64HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W1: Pre. West WS
Runoff = 13.20 cfs @ 3.33 hrs, Volume= 34,918 cf, Depth= 1.15"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 10-yr Rainfall=3.72"
Area (ac) CN Description
8.390 70 Woods, Good, HSG C
8.390 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
11.6 50 0.0243 0.07 Sheet Flow, West-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
2.1 328 0.0270 2.65 Shallow Concentrated Flow, West Shallow1
Unpaved Kv= 16.1 fps
2.8 540 0.0396 3.20 Shallow Concentrated Flow, W-Shallow2
Unpaved Kv= 16.1 fps
16.5 918 Total
Subcatchment W1: Pre. West WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Charlotte 6-hr 10-yr
Rainfall=3.72"
Runoff Area=8.390 ac
Runoff Volume=34,918 cf
Runoff Depth=1.15"
Flow Length=918'
Tc=16.5 min
CN=70
13.20 cfs
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 65HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W1: Pre. West WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.14 0.00 0.00
2.00 0.39 0.00 0.00
3.00 1.50 0.08 0.72
4.00 3.29 0.88 2.93
5.00 3.56 1.05 1.11
6.00 3.72 1.15 0.78
7.00 3.72 1.15 0.00
8.00 3.72 1.15 0.00
9.00 3.72 1.15 0.00
10.00 3.72 1.15 0.00
11.00 3.72 1.15 0.00
12.00 3.72 1.15 0.00
13.00 3.72 1.15 0.00
14.00 3.72 1.15 0.00
15.00 3.72 1.15 0.00
16.00 3.72 1.15 0.00
17.00 3.72 1.15 0.00
18.00 3.72 1.15 0.00
19.00 3.72 1.15 0.00
20.00 3.72 1.15 0.00
21.00 3.72 1.15 0.00
22.00 3.72 1.15 0.00
23.00 3.72 1.15 0.00
24.00 3.72 1.15 0.00
25.00 3.72 1.15 0.00
26.00 3.72 1.15 0.00
27.00 3.72 1.15 0.00
28.00 3.72 1.15 0.00
29.00 3.72 1.15 0.00
30.00 3.72 1.15 0.00
31.00 3.72 1.15 0.00
32.00 3.72 1.15 0.00
33.00 3.72 1.15 0.00
34.00 3.72 1.15 0.00
35.00 3.72 1.15 0.00
36.00 3.72 1.15 0.00
37.00 3.72 1.15 0.00
38.00 3.72 1.15 0.00
39.00 3.72 1.15 0.00
40.00 3.72 1.15 0.00
41.00 3.72 1.15 0.00
42.00 3.72 1.15 0.00
43.00 3.72 1.15 0.00
44.00 3.72 1.15 0.00
45.00 3.72 1.15 0.00
46.00 3.72 1.15 0.00
47.00 3.72 1.15 0.00
48.00 3.72 1.15 0.00
49.00 3.72 1.15 0.00
50.00 3.72 1.15 0.00
51.00 3.72 1.15 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 3.72 1.15 0.00
53.00 3.72 1.15 0.00
54.00 3.72 1.15 0.00
55.00 3.72 1.15 0.00
56.00 3.72 1.15 0.00
57.00 3.72 1.15 0.00
58.00 3.72 1.15 0.00
59.00 3.72 1.15 0.00
60.00 3.72 1.15 0.00
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 66HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W1-A: Pre. West WS
Runoff = 6.59 cfs @ 3.33 hrs, Volume= 17,438 cf, Depth= 1.15"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 10-yr Rainfall=3.72"
Area (ac) CN Description
4.190 70 Woods, Good, HSG C
4.190 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
11.6 50 0.0243 0.07 Sheet Flow, West-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
2.1 328 0.0270 2.65 Shallow Concentrated Flow, West Shallow1
Unpaved Kv= 16.1 fps
2.8 540 0.0396 3.20 Shallow Concentrated Flow, W-Shallow2
Unpaved Kv= 16.1 fps
16.5 918 Total
Subcatchment W1-A: Pre. West WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)7
6
5
4
3
2
1
0
Charlotte 6-hr 10-yr
Rainfall=3.72"
Runoff Area=4.190 ac
Runoff Volume=17,438 cf
Runoff Depth=1.15"
Flow Length=918'
Tc=16.5 min
CN=70
6.59 cfs
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 67HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W1-A: Pre. West WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.14 0.00 0.00
2.00 0.39 0.00 0.00
3.00 1.50 0.08 0.36
4.00 3.29 0.88 1.46
5.00 3.56 1.05 0.55
6.00 3.72 1.15 0.39
7.00 3.72 1.15 0.00
8.00 3.72 1.15 0.00
9.00 3.72 1.15 0.00
10.00 3.72 1.15 0.00
11.00 3.72 1.15 0.00
12.00 3.72 1.15 0.00
13.00 3.72 1.15 0.00
14.00 3.72 1.15 0.00
15.00 3.72 1.15 0.00
16.00 3.72 1.15 0.00
17.00 3.72 1.15 0.00
18.00 3.72 1.15 0.00
19.00 3.72 1.15 0.00
20.00 3.72 1.15 0.00
21.00 3.72 1.15 0.00
22.00 3.72 1.15 0.00
23.00 3.72 1.15 0.00
24.00 3.72 1.15 0.00
25.00 3.72 1.15 0.00
26.00 3.72 1.15 0.00
27.00 3.72 1.15 0.00
28.00 3.72 1.15 0.00
29.00 3.72 1.15 0.00
30.00 3.72 1.15 0.00
31.00 3.72 1.15 0.00
32.00 3.72 1.15 0.00
33.00 3.72 1.15 0.00
34.00 3.72 1.15 0.00
35.00 3.72 1.15 0.00
36.00 3.72 1.15 0.00
37.00 3.72 1.15 0.00
38.00 3.72 1.15 0.00
39.00 3.72 1.15 0.00
40.00 3.72 1.15 0.00
41.00 3.72 1.15 0.00
42.00 3.72 1.15 0.00
43.00 3.72 1.15 0.00
44.00 3.72 1.15 0.00
45.00 3.72 1.15 0.00
46.00 3.72 1.15 0.00
47.00 3.72 1.15 0.00
48.00 3.72 1.15 0.00
49.00 3.72 1.15 0.00
50.00 3.72 1.15 0.00
51.00 3.72 1.15 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 3.72 1.15 0.00
53.00 3.72 1.15 0.00
54.00 3.72 1.15 0.00
55.00 3.72 1.15 0.00
56.00 3.72 1.15 0.00
57.00 3.72 1.15 0.00
58.00 3.72 1.15 0.00
59.00 3.72 1.15 0.00
60.00 3.72 1.15 0.00
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 68HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W3: West Onsite Bypass
Runoff = 4.79 cfs @ 3.55 hrs, Volume= 17,480 cf, Depth= 1.15"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 10-yr Rainfall=3.72"
Area (ac) CN Description
4.200 70 Woods, Good, HSG C
4.200 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.5 264 0.0550 0.14 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
Subcatchment W3: West Onsite Bypass
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)5
4
3
2
1
0
Charlotte 6-hr 10-yr
Rainfall=3.72"
Runoff Area=4.200 ac
Runoff Volume=17,480 cf
Runoff Depth=1.15"
Flow Length=264'
Slope=0.0550 '/'
Tc=31.5 min
CN=70
4.79 cfs
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 69HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W3: West Onsite Bypass
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.14 0.00 0.00
2.00 0.39 0.00 0.00
3.00 1.50 0.08 0.06
4.00 3.29 0.88 2.40
5.00 3.56 1.05 0.69
6.00 3.72 1.15 0.42
7.00 3.72 1.15 0.01
8.00 3.72 1.15 0.00
9.00 3.72 1.15 0.00
10.00 3.72 1.15 0.00
11.00 3.72 1.15 0.00
12.00 3.72 1.15 0.00
13.00 3.72 1.15 0.00
14.00 3.72 1.15 0.00
15.00 3.72 1.15 0.00
16.00 3.72 1.15 0.00
17.00 3.72 1.15 0.00
18.00 3.72 1.15 0.00
19.00 3.72 1.15 0.00
20.00 3.72 1.15 0.00
21.00 3.72 1.15 0.00
22.00 3.72 1.15 0.00
23.00 3.72 1.15 0.00
24.00 3.72 1.15 0.00
25.00 3.72 1.15 0.00
26.00 3.72 1.15 0.00
27.00 3.72 1.15 0.00
28.00 3.72 1.15 0.00
29.00 3.72 1.15 0.00
30.00 3.72 1.15 0.00
31.00 3.72 1.15 0.00
32.00 3.72 1.15 0.00
33.00 3.72 1.15 0.00
34.00 3.72 1.15 0.00
35.00 3.72 1.15 0.00
36.00 3.72 1.15 0.00
37.00 3.72 1.15 0.00
38.00 3.72 1.15 0.00
39.00 3.72 1.15 0.00
40.00 3.72 1.15 0.00
41.00 3.72 1.15 0.00
42.00 3.72 1.15 0.00
43.00 3.72 1.15 0.00
44.00 3.72 1.15 0.00
45.00 3.72 1.15 0.00
46.00 3.72 1.15 0.00
47.00 3.72 1.15 0.00
48.00 3.72 1.15 0.00
49.00 3.72 1.15 0.00
50.00 3.72 1.15 0.00
51.00 3.72 1.15 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 3.72 1.15 0.00
53.00 3.72 1.15 0.00
54.00 3.72 1.15 0.00
55.00 3.72 1.15 0.00
56.00 3.72 1.15 0.00
57.00 3.72 1.15 0.00
58.00 3.72 1.15 0.00
59.00 3.72 1.15 0.00
60.00 3.72 1.15 0.00
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 70HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Pond 1P: West Basin
Inflow Area = 182,604 sf, 49.90% Impervious, Inflow Depth = 2.29" for 10-yr event
Inflow = 17.61 cfs @ 3.19 hrs, Volume= 34,910 cf
Outflow = 4.16 cfs @ 3.55 hrs, Volume= 28,133 cf, Atten= 76%, Lag= 21.7 min
Primary = 4.16 cfs @ 3.55 hrs, Volume= 28,133 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Peak Elev= 639.29' @ 3.55 hrs Surf.Area= 13,673 sf Storage= 20,214 cf
Plug-Flow detention time= 347.6 min calculated for 28,110 cf (81% of inflow)
Center-of-Mass det. time= 331.9 min ( 544.3 - 212.4 )
Volume Invert Avail.Storage Storage Description
#1 637.50' 67,620 cf Custom Stage Data (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
637.50 7,400 0 0
638.00 11,122 4,631 4,631
639.00 12,383 11,753 16,383
640.00 16,772 14,578 30,961
641.00 18,330 17,551 48,512
642.00 19,887 19,109 67,620
Device Routing Invert Outlet Devices
#1 Primary 636.70'24.0" Round Culvert
L= 40.9' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 636.70' / 636.50' S= 0.0049 '/' Cc= 0.900
n= 0.013, Flow Area= 3.14 sf
#2 Device 1 637.50'1.0" Vert. Orifice/Grate C= 0.600
#3 Device 1 638.55'24.0" W x 9.0" H Vert. Orifice/Grate C= 0.600
#4 Secondary 641.50'10.0' 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
Primary OutFlow Max=4.15 cfs @ 3.55 hrs HW=639.29' (Free Discharge)
1=Culvert (Passes 4.15 cfs of 16.53 cfs potential flow)
2=Orifice/Grate (Orifice Controls 0.03 cfs @ 6.37 fps)
3=Orifice/Grate (Orifice Controls 4.12 cfs @ 2.77 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=637.50' (Free Discharge)
4=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 71HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Pond 1P: West Basin
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Inflow Area=182,604 sf
Peak Elev=639.29'
Storage=20,214 cf
17.61 cfs
4.16 cfs
4.16 cfs
0.00 cfs
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 72HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Pond 1P: West Basin
Time
(hours)
Inflow
(cfs)
Storage
(cubic-feet)
Elevation
(feet)
Outflow
(cfs)
Primary
(cfs)
Secondary
(cfs)
0.00 0.00 0 637.50 0.00 0.00 0.00
2.50 0.60 509 637.57 0.00 0.00 0.00
5.00 0.74 15,060 638.89 1.32 1.32 0.00
7.50 0.00 11,859 638.63 0.17 0.17 0.00
10.00 0.00 11,112 638.56 0.04 0.04 0.00
12.50 0.00 10,836 638.54 0.03 0.03 0.00
15.00 0.00 10,601 638.52 0.03 0.03 0.00
17.50 0.00 10,368 638.50 0.03 0.03 0.00
20.00 0.00 10,138 638.48 0.03 0.03 0.00
22.50 0.00 9,910 638.46 0.03 0.03 0.00
25.00 0.00 9,684 638.44 0.02 0.02 0.00
27.50 0.00 9,461 638.42 0.02 0.02 0.00
30.00 0.00 9,240 638.41 0.02 0.02 0.00
32.50 0.00 9,022 638.39 0.02 0.02 0.00
35.00 0.00 8,806 638.37 0.02 0.02 0.00
37.50 0.00 8,592 638.35 0.02 0.02 0.00
40.00 0.00 8,381 638.33 0.02 0.02 0.00
42.50 0.00 8,172 638.31 0.02 0.02 0.00
45.00 0.00 7,966 638.29 0.02 0.02 0.00
47.50 0.00 7,762 638.28 0.02 0.02 0.00
50.00 0.00 7,561 638.26 0.02 0.02 0.00
52.50 0.00 7,361 638.24 0.02 0.02 0.00
55.00 0.00 7,165 638.22 0.02 0.02 0.00
57.50 0.00 6,971 638.21 0.02 0.02 0.00
60.00 0.00 6,779 638.19 0.02 0.02 0.00
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 73HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Pond 5P: Prop Retention Pond East
Inflow Area = 821,106 sf, 44.60% Impervious, Inflow Depth = 1.67" for 10-yr event
Inflow = 28.74 cfs @ 3.63 hrs, Volume= 114,031 cf
Outflow = 4.12 cfs @ 5.09 hrs, Volume= 61,985 cf, Atten= 86%, Lag= 87.8 min
Primary = 0.19 cfs @ 5.09 hrs, Volume= 34,540 cf
Secondary = 3.92 cfs @ 5.09 hrs, Volume= 27,446 cf
Tertiary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Peak Elev= 637.97' @ 5.09 hrs Surf.Area= 31,372 sf Storage= 91,562 cf
Plug-Flow detention time= 963.7 min calculated for 61,985 cf (54% of inflow)
Center-of-Mass det. time= 931.4 min ( 1,179.3 - 247.9 )
Volume Invert Avail.Storage Storage Description
#1 634.50' 161,487 cf East Wet Ponds (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
634.50 19,267 0 0
635.00 23,340 10,652 10,652
636.00 25,936 24,638 35,290
637.00 28,646 27,291 62,581
638.00 31,469 30,058 92,638
639.00 34,391 32,930 125,568
640.00 37,447 35,919 161,487
Device Routing Invert Outlet Devices
#1 Primary 634.50'2.0" Vert. Orifice/Grate C= 0.600
#2 Secondary 637.68'24.0" W x 9.0" H Vert. Orifice/Grate X 4.00 C= 0.600
#3 Tertiary 639.50'10.0' 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
Primary OutFlow Max=0.19 cfs @ 5.09 hrs HW=637.97' (Free Discharge)
1=Orifice/Grate (Orifice Controls 0.19 cfs @ 8.86 fps)
Secondary OutFlow Max=3.92 cfs @ 5.09 hrs HW=637.97' (Free Discharge)
2=Orifice/Grate (Orifice Controls 3.92 cfs @ 1.72 fps)
Tertiary OutFlow Max=0.00 cfs @ 0.00 hrs HW=634.50' (Free Discharge)
3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 74HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Pond 5P: Prop Retention Pond East
Inflow
Outflow
Primary
Secondary
Tertiary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Inflow Area=821,106 sf
Peak Elev=637.97'
Storage=91,562 cf
28.74 cfs
4.12 cfs
0.19 cfs
3.92 cfs
0.00 cfs
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 75HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Pond 5P: Prop Retention Pond East
Time
(hours)
Inflow
(cfs)
Storage
(cubic-feet)
Elevation
(feet)
Outflow
(cfs)
Primary
(cfs)
Secondary
(cfs)
Tertiary
(cfs)
0.00 0.00 0 634.50 0.00 0.00 0.00 0.00
2.50 0.00 0 634.50 0.00 0.00 0.00 0.00
5.00 4.49 91,500 637.96 4.08 0.19 3.88 0.00
7.50 0.03 84,862 637.75 0.67 0.19 0.48 0.00
10.00 0.00 82,215 637.66 0.18 0.18 0.00 0.00
12.50 0.00 80,563 637.61 0.18 0.18 0.00 0.00
15.00 0.00 78,926 637.56 0.18 0.18 0.00 0.00
17.50 0.00 77,304 637.50 0.18 0.18 0.00 0.00
20.00 0.00 75,696 637.45 0.18 0.18 0.00 0.00
22.50 0.00 74,103 637.39 0.18 0.18 0.00 0.00
25.00 0.00 72,526 637.34 0.17 0.17 0.00 0.00
27.50 0.00 70,963 637.29 0.17 0.17 0.00 0.00
30.00 0.00 69,416 637.24 0.17 0.17 0.00 0.00
32.50 0.00 67,884 637.18 0.17 0.17 0.00 0.00
35.00 0.00 66,367 637.13 0.17 0.17 0.00 0.00
37.50 0.00 64,866 637.08 0.17 0.17 0.00 0.00
40.00 0.00 63,380 637.03 0.16 0.16 0.00 0.00
42.50 0.00 61,909 636.98 0.16 0.16 0.00 0.00
45.00 0.00 60,455 636.93 0.16 0.16 0.00 0.00
47.50 0.00 59,016 636.87 0.16 0.16 0.00 0.00
50.00 0.00 57,593 636.82 0.16 0.16 0.00 0.00
52.50 0.00 56,185 636.77 0.16 0.16 0.00 0.00
55.00 0.00 54,794 636.72 0.15 0.15 0.00 0.00
57.50 0.00 53,418 636.68 0.15 0.15 0.00 0.00
60.00 0.00 52,059 636.63 0.15 0.15 0.00 0.00
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 76HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Link 1L: (new Link)
Inflow Area = 365,556 sf, 24.93% Impervious, Inflow Depth > 1.50" for 10-yr event
Inflow = 8.95 cfs @ 3.55 hrs, Volume= 45,613 cf
Primary = 8.95 cfs @ 3.55 hrs, Volume= 45,613 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Link 1L: (new Link)
Inflow
Primary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)10
9
8
7
6
5
4
3
2
1
0
Inflow Area=365,556 sf
8.95 cfs
8.95 cfs
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 77HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Link 1L: (new Link)
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
0.00 0.00 0.00 0.00
1.00 0.00 0.00 0.00
2.00 0.00 0.00 0.00
3.00 0.08 0.00 0.08
4.00 5.48 0.00 5.48
5.00 2.01 0.00 2.01
6.00 1.18 0.00 1.18
7.00 0.28 0.00 0.28
8.00 0.12 0.00 0.12
9.00 0.06 0.00 0.06
10.00 0.04 0.00 0.04
11.00 0.03 0.00 0.03
12.00 0.03 0.00 0.03
13.00 0.03 0.00 0.03
14.00 0.03 0.00 0.03
15.00 0.03 0.00 0.03
16.00 0.03 0.00 0.03
17.00 0.03 0.00 0.03
18.00 0.03 0.00 0.03
19.00 0.03 0.00 0.03
20.00 0.03 0.00 0.03
21.00 0.03 0.00 0.03
22.00 0.03 0.00 0.03
23.00 0.03 0.00 0.03
24.00 0.03 0.00 0.03
25.00 0.02 0.00 0.02
26.00 0.02 0.00 0.02
27.00 0.02 0.00 0.02
28.00 0.02 0.00 0.02
29.00 0.02 0.00 0.02
30.00 0.02 0.00 0.02
31.00 0.02 0.00 0.02
32.00 0.02 0.00 0.02
33.00 0.02 0.00 0.02
34.00 0.02 0.00 0.02
35.00 0.02 0.00 0.02
36.00 0.02 0.00 0.02
37.00 0.02 0.00 0.02
38.00 0.02 0.00 0.02
39.00 0.02 0.00 0.02
40.00 0.02 0.00 0.02
41.00 0.02 0.00 0.02
42.00 0.02 0.00 0.02
43.00 0.02 0.00 0.02
44.00 0.02 0.00 0.02
45.00 0.02 0.00 0.02
46.00 0.02 0.00 0.02
47.00 0.02 0.00 0.02
48.00 0.02 0.00 0.02
49.00 0.02 0.00 0.02
50.00 0.02 0.00 0.02
51.00 0.02 0.00 0.02
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
52.00 0.02 0.00 0.02
53.00 0.02 0.00 0.02
54.00 0.02 0.00 0.02
55.00 0.02 0.00 0.02
56.00 0.02 0.00 0.02
57.00 0.02 0.00 0.02
58.00 0.02 0.00 0.02
59.00 0.02 0.00 0.02
60.00 0.02 0.00 0.02
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 78HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Link 6L: East Post Comb
Inflow Area = 964,418 sf, 37.97% Impervious, Inflow Depth > 0.60" for 10-yr event
Inflow = 6.83 cfs @ 3.21 hrs, Volume= 48,232 cf
Primary = 6.83 cfs @ 3.21 hrs, Volume= 48,232 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Link 6L: East Post Comb
Inflow
Primary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)7
6
5
4
3
2
1
0
Inflow Area=964,418 sf
6.83 cfs
6.83 cfs
Charlotte 6-hr 10-yr Rainfall=3.72"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 79HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Link 6L: East Post Comb
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
0.00 0.00 0.00 0.00
1.00 0.00 0.00 0.00
2.00 0.00 0.00 0.00
3.00 1.03 0.00 1.03
4.00 1.13 0.00 1.13
5.00 0.60 0.00 0.60
6.00 0.48 0.00 0.48
7.00 0.19 0.00 0.19
8.00 0.19 0.00 0.19
9.00 0.19 0.00 0.19
10.00 0.18 0.00 0.18
11.00 0.18 0.00 0.18
12.00 0.18 0.00 0.18
13.00 0.18 0.00 0.18
14.00 0.18 0.00 0.18
15.00 0.18 0.00 0.18
16.00 0.18 0.00 0.18
17.00 0.18 0.00 0.18
18.00 0.18 0.00 0.18
19.00 0.18 0.00 0.18
20.00 0.18 0.00 0.18
21.00 0.18 0.00 0.18
22.00 0.18 0.00 0.18
23.00 0.18 0.00 0.18
24.00 0.18 0.00 0.18
25.00 0.17 0.00 0.17
26.00 0.17 0.00 0.17
27.00 0.17 0.00 0.17
28.00 0.17 0.00 0.17
29.00 0.17 0.00 0.17
30.00 0.17 0.00 0.17
31.00 0.17 0.00 0.17
32.00 0.17 0.00 0.17
33.00 0.17 0.00 0.17
34.00 0.17 0.00 0.17
35.00 0.17 0.00 0.17
36.00 0.17 0.00 0.17
37.00 0.17 0.00 0.17
38.00 0.17 0.00 0.17
39.00 0.16 0.00 0.16
40.00 0.16 0.00 0.16
41.00 0.16 0.00 0.16
42.00 0.16 0.00 0.16
43.00 0.16 0.00 0.16
44.00 0.16 0.00 0.16
45.00 0.16 0.00 0.16
46.00 0.16 0.00 0.16
47.00 0.16 0.00 0.16
48.00 0.16 0.00 0.16
49.00 0.16 0.00 0.16
50.00 0.16 0.00 0.16
51.00 0.16 0.00 0.16
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
52.00 0.16 0.00 0.16
53.00 0.16 0.00 0.16
54.00 0.15 0.00 0.15
55.00 0.15 0.00 0.15
56.00 0.15 0.00 0.15
57.00 0.15 0.00 0.15
58.00 0.15 0.00 0.15
59.00 0.15 0.00 0.15
60.00 0.15 0.00 0.15
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 80HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment 3S: West Post
Runoff = 24.38 cfs @ 3.19 hrs, Volume= 44,021 cf, Depth= 2.89"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"
Area (ac) CN Description
2.092 98 Paved parking, HSG C
2.100 74 >75% Grass cover, Good, HSG C
4.192 86 Weighted Average
2.100 50.10% Pervious Area
2.092 49.90% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
7.5 Direct Entry, Min Tc
Subcatchment 3S: West Post
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)26
24
22
20
18
16
14
12
10
8
6
4
2
0
Charlotte 6-hr 2-yr
25-yr Rainfall=4.38"
Runoff Area=4.192 ac
Runoff Volume=44,021 cf
Runoff Depth=2.89"
Tc=7.5 min
CN=86
24.38 cfs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 81HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment 3S: West Post
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.18 0.00 0.00
2.00 0.48 0.01 0.20
3.00 1.71 0.63 6.82
4.00 3.86 2.42 2.08
5.00 4.18 2.71 0.92
6.00 4.38 2.89 0.66
7.00 4.38 2.89 0.00
8.00 4.38 2.89 0.00
9.00 4.38 2.89 0.00
10.00 4.38 2.89 0.00
11.00 4.38 2.89 0.00
12.00 4.38 2.89 0.00
13.00 4.38 2.89 0.00
14.00 4.38 2.89 0.00
15.00 4.38 2.89 0.00
16.00 4.38 2.89 0.00
17.00 4.38 2.89 0.00
18.00 4.38 2.89 0.00
19.00 4.38 2.89 0.00
20.00 4.38 2.89 0.00
21.00 4.38 2.89 0.00
22.00 4.38 2.89 0.00
23.00 4.38 2.89 0.00
24.00 4.38 2.89 0.00
25.00 4.38 2.89 0.00
26.00 4.38 2.89 0.00
27.00 4.38 2.89 0.00
28.00 4.38 2.89 0.00
29.00 4.38 2.89 0.00
30.00 4.38 2.89 0.00
31.00 4.38 2.89 0.00
32.00 4.38 2.89 0.00
33.00 4.38 2.89 0.00
34.00 4.38 2.89 0.00
35.00 4.38 2.89 0.00
36.00 4.38 2.89 0.00
37.00 4.38 2.89 0.00
38.00 4.38 2.89 0.00
39.00 4.38 2.89 0.00
40.00 4.38 2.89 0.00
41.00 4.38 2.89 0.00
42.00 4.38 2.89 0.00
43.00 4.38 2.89 0.00
44.00 4.38 2.89 0.00
45.00 4.38 2.89 0.00
46.00 4.38 2.89 0.00
47.00 4.38 2.89 0.00
48.00 4.38 2.89 0.00
49.00 4.38 2.89 0.00
50.00 4.38 2.89 0.00
51.00 4.38 2.89 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 4.38 2.89 0.00
53.00 4.38 2.89 0.00
54.00 4.38 2.89 0.00
55.00 4.38 2.89 0.00
56.00 4.38 2.89 0.00
57.00 4.38 2.89 0.00
58.00 4.38 2.89 0.00
59.00 4.38 2.89 0.00
60.00 4.38 2.89 0.00
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 82HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E1: Pre. East WS
Runoff = 25.51 cfs @ 3.89 hrs, Volume= 129,521 cf, Depth= 1.59"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"
Area (ac) CN Description
22.450 70 Woods, Good, HSG C
22.450 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
49.7 270 0.0185 0.09 Sheet Flow, East-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
7.3 940 0.0176 2.14 Shallow Concentrated Flow, West Shallow
Unpaved Kv= 16.1 fps
57.0 1,210 Total
Subcatchment E1: Pre. East WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Charlotte 6-hr 2-yr
25-yr Rainfall=4.38"
Runoff Area=22.450 ac
Runoff Volume=129,521 cf
Runoff Depth=1.59"
Flow Length=1,210'
Tc=57.0 min
CN=70
25.51 cfs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 83HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E1: Pre. East WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.18 0.00 0.00
2.00 0.48 0.00 0.00
3.00 1.71 0.14 0.14
4.00 3.86 1.24 24.75
5.00 4.18 1.45 7.91
6.00 4.38 1.59 3.74
7.00 4.38 1.59 0.92
8.00 4.38 1.59 0.06
9.00 4.38 1.59 0.00
10.00 4.38 1.59 0.00
11.00 4.38 1.59 0.00
12.00 4.38 1.59 0.00
13.00 4.38 1.59 0.00
14.00 4.38 1.59 0.00
15.00 4.38 1.59 0.00
16.00 4.38 1.59 0.00
17.00 4.38 1.59 0.00
18.00 4.38 1.59 0.00
19.00 4.38 1.59 0.00
20.00 4.38 1.59 0.00
21.00 4.38 1.59 0.00
22.00 4.38 1.59 0.00
23.00 4.38 1.59 0.00
24.00 4.38 1.59 0.00
25.00 4.38 1.59 0.00
26.00 4.38 1.59 0.00
27.00 4.38 1.59 0.00
28.00 4.38 1.59 0.00
29.00 4.38 1.59 0.00
30.00 4.38 1.59 0.00
31.00 4.38 1.59 0.00
32.00 4.38 1.59 0.00
33.00 4.38 1.59 0.00
34.00 4.38 1.59 0.00
35.00 4.38 1.59 0.00
36.00 4.38 1.59 0.00
37.00 4.38 1.59 0.00
38.00 4.38 1.59 0.00
39.00 4.38 1.59 0.00
40.00 4.38 1.59 0.00
41.00 4.38 1.59 0.00
42.00 4.38 1.59 0.00
43.00 4.38 1.59 0.00
44.00 4.38 1.59 0.00
45.00 4.38 1.59 0.00
46.00 4.38 1.59 0.00
47.00 4.38 1.59 0.00
48.00 4.38 1.59 0.00
49.00 4.38 1.59 0.00
50.00 4.38 1.59 0.00
51.00 4.38 1.59 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 4.38 1.59 0.00
53.00 4.38 1.59 0.00
54.00 4.38 1.59 0.00
55.00 4.38 1.59 0.00
56.00 4.38 1.59 0.00
57.00 4.38 1.59 0.00
58.00 4.38 1.59 0.00
59.00 4.38 1.59 0.00
60.00 4.38 1.59 0.00
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 84HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E1-A: Pre. East WS to BMP
Runoff = 21.42 cfs @ 3.89 hrs, Volume= 108,752 cf, Depth= 1.59"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"
Area (ac) CN Description
18.850 70 Woods, Good, HSG C
18.850 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
49.7 270 0.0185 0.09 Sheet Flow, East-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
7.3 940 0.0176 2.14 Shallow Concentrated Flow, West Shallow
Unpaved Kv= 16.1 fps
57.0 1,210 Total
Subcatchment E1-A: Pre. East WS to BMP
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Charlotte 6-hr 2-yr
25-yr Rainfall=4.38"
Runoff Area=18.850 ac
Runoff Volume=108,752 cf
Runoff Depth=1.59"
Flow Length=1,210'
Tc=57.0 min
CN=70
21.42 cfs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 85HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E1-A: Pre. East WS to BMP
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.18 0.00 0.00
2.00 0.48 0.00 0.00
3.00 1.71 0.14 0.11
4.00 3.86 1.24 20.78
5.00 4.18 1.45 6.64
6.00 4.38 1.59 3.14
7.00 4.38 1.59 0.77
8.00 4.38 1.59 0.05
9.00 4.38 1.59 0.00
10.00 4.38 1.59 0.00
11.00 4.38 1.59 0.00
12.00 4.38 1.59 0.00
13.00 4.38 1.59 0.00
14.00 4.38 1.59 0.00
15.00 4.38 1.59 0.00
16.00 4.38 1.59 0.00
17.00 4.38 1.59 0.00
18.00 4.38 1.59 0.00
19.00 4.38 1.59 0.00
20.00 4.38 1.59 0.00
21.00 4.38 1.59 0.00
22.00 4.38 1.59 0.00
23.00 4.38 1.59 0.00
24.00 4.38 1.59 0.00
25.00 4.38 1.59 0.00
26.00 4.38 1.59 0.00
27.00 4.38 1.59 0.00
28.00 4.38 1.59 0.00
29.00 4.38 1.59 0.00
30.00 4.38 1.59 0.00
31.00 4.38 1.59 0.00
32.00 4.38 1.59 0.00
33.00 4.38 1.59 0.00
34.00 4.38 1.59 0.00
35.00 4.38 1.59 0.00
36.00 4.38 1.59 0.00
37.00 4.38 1.59 0.00
38.00 4.38 1.59 0.00
39.00 4.38 1.59 0.00
40.00 4.38 1.59 0.00
41.00 4.38 1.59 0.00
42.00 4.38 1.59 0.00
43.00 4.38 1.59 0.00
44.00 4.38 1.59 0.00
45.00 4.38 1.59 0.00
46.00 4.38 1.59 0.00
47.00 4.38 1.59 0.00
48.00 4.38 1.59 0.00
49.00 4.38 1.59 0.00
50.00 4.38 1.59 0.00
51.00 4.38 1.59 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 4.38 1.59 0.00
53.00 4.38 1.59 0.00
54.00 4.38 1.59 0.00
55.00 4.38 1.59 0.00
56.00 4.38 1.59 0.00
57.00 4.38 1.59 0.00
58.00 4.38 1.59 0.00
59.00 4.38 1.59 0.00
60.00 4.38 1.59 0.00
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 86HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E2: East Post
Runoff = 39.25 cfs @ 3.61 hrs, Volume= 150,134 cf, Depth= 2.19"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"
Area (ac) CN Description
0.320 70 Woods, Good, HSG C
* 0.390 98 Retention Ponds
* 17.410 78 Residential, 45% imp, HSG C
0.730 80 1/2 acre lots, 25% imp, HSG C
18.850 78 Weighted Average
10.443 55.40% Pervious Area
8.407 44.60% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
32.3 164 0.0200 0.08 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
6.8 1,511 0.0050 3.72 4.57 Pipe Channel, Storm Sewer
15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31'
n= 0.013
39.1 1,675 Total
Subcatchment E2: East Post
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Charlotte 6-hr 2-yr
25-yr Rainfall=4.38"
Runoff Area=18.850 ac
Runoff Volume=150,134 cf
Runoff Depth=2.19"
Flow Length=1,675'
Tc=39.1 min
CN=78
39.25 cfs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 87HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E2: East Post
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.18 0.00 0.00
2.00 0.48 0.00 0.00
3.00 1.71 0.33 2.31
4.00 3.86 1.78 22.55
5.00 4.18 2.04 5.64
6.00 4.38 2.19 3.14
7.00 4.38 2.19 0.26
8.00 4.38 2.19 0.00
9.00 4.38 2.19 0.00
10.00 4.38 2.19 0.00
11.00 4.38 2.19 0.00
12.00 4.38 2.19 0.00
13.00 4.38 2.19 0.00
14.00 4.38 2.19 0.00
15.00 4.38 2.19 0.00
16.00 4.38 2.19 0.00
17.00 4.38 2.19 0.00
18.00 4.38 2.19 0.00
19.00 4.38 2.19 0.00
20.00 4.38 2.19 0.00
21.00 4.38 2.19 0.00
22.00 4.38 2.19 0.00
23.00 4.38 2.19 0.00
24.00 4.38 2.19 0.00
25.00 4.38 2.19 0.00
26.00 4.38 2.19 0.00
27.00 4.38 2.19 0.00
28.00 4.38 2.19 0.00
29.00 4.38 2.19 0.00
30.00 4.38 2.19 0.00
31.00 4.38 2.19 0.00
32.00 4.38 2.19 0.00
33.00 4.38 2.19 0.00
34.00 4.38 2.19 0.00
35.00 4.38 2.19 0.00
36.00 4.38 2.19 0.00
37.00 4.38 2.19 0.00
38.00 4.38 2.19 0.00
39.00 4.38 2.19 0.00
40.00 4.38 2.19 0.00
41.00 4.38 2.19 0.00
42.00 4.38 2.19 0.00
43.00 4.38 2.19 0.00
44.00 4.38 2.19 0.00
45.00 4.38 2.19 0.00
46.00 4.38 2.19 0.00
47.00 4.38 2.19 0.00
48.00 4.38 2.19 0.00
49.00 4.38 2.19 0.00
50.00 4.38 2.19 0.00
51.00 4.38 2.19 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 4.38 2.19 0.00
53.00 4.38 2.19 0.00
54.00 4.38 2.19 0.00
55.00 4.38 2.19 0.00
56.00 4.38 2.19 0.00
57.00 4.38 2.19 0.00
58.00 4.38 2.19 0.00
59.00 4.38 2.19 0.00
60.00 4.38 2.19 0.00
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 88HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E3: East Onsite Bypass
Runoff = 10.61 cfs @ 3.20 hrs, Volume= 18,981 cf, Depth= 1.59"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"
Area (ac) CN Description
3.290 70 Woods, Good, HSG C
3.290 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
7.5 Direct Entry, Direct Discharge
Subcatchment E3: East Onsite Bypass
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)11
10
9
8
7
6
5
4
3
2
1
0
Charlotte 6-hr 2-yr
25-yr Rainfall=4.38"
Runoff Area=3.290 ac
Runoff Volume=18,981 cf
Runoff Depth=1.59"
Tc=7.5 min
CN=70
10.61 cfs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 89HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E3: East Onsite Bypass
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.18 0.00 0.00
2.00 0.48 0.00 0.00
3.00 1.71 0.14 1.63
4.00 3.86 1.24 1.18
5.00 4.18 1.45 0.54
6.00 4.38 1.59 0.39
7.00 4.38 1.59 0.00
8.00 4.38 1.59 0.00
9.00 4.38 1.59 0.00
10.00 4.38 1.59 0.00
11.00 4.38 1.59 0.00
12.00 4.38 1.59 0.00
13.00 4.38 1.59 0.00
14.00 4.38 1.59 0.00
15.00 4.38 1.59 0.00
16.00 4.38 1.59 0.00
17.00 4.38 1.59 0.00
18.00 4.38 1.59 0.00
19.00 4.38 1.59 0.00
20.00 4.38 1.59 0.00
21.00 4.38 1.59 0.00
22.00 4.38 1.59 0.00
23.00 4.38 1.59 0.00
24.00 4.38 1.59 0.00
25.00 4.38 1.59 0.00
26.00 4.38 1.59 0.00
27.00 4.38 1.59 0.00
28.00 4.38 1.59 0.00
29.00 4.38 1.59 0.00
30.00 4.38 1.59 0.00
31.00 4.38 1.59 0.00
32.00 4.38 1.59 0.00
33.00 4.38 1.59 0.00
34.00 4.38 1.59 0.00
35.00 4.38 1.59 0.00
36.00 4.38 1.59 0.00
37.00 4.38 1.59 0.00
38.00 4.38 1.59 0.00
39.00 4.38 1.59 0.00
40.00 4.38 1.59 0.00
41.00 4.38 1.59 0.00
42.00 4.38 1.59 0.00
43.00 4.38 1.59 0.00
44.00 4.38 1.59 0.00
45.00 4.38 1.59 0.00
46.00 4.38 1.59 0.00
47.00 4.38 1.59 0.00
48.00 4.38 1.59 0.00
49.00 4.38 1.59 0.00
50.00 4.38 1.59 0.00
51.00 4.38 1.59 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 4.38 1.59 0.00
53.00 4.38 1.59 0.00
54.00 4.38 1.59 0.00
55.00 4.38 1.59 0.00
56.00 4.38 1.59 0.00
57.00 4.38 1.59 0.00
58.00 4.38 1.59 0.00
59.00 4.38 1.59 0.00
60.00 4.38 1.59 0.00
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 90HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W1: Pre. West WS
Runoff = 20.04 cfs @ 3.32 hrs, Volume= 48,405 cf, Depth= 1.59"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"
Area (ac) CN Description
8.390 70 Woods, Good, HSG C
8.390 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
11.6 50 0.0243 0.07 Sheet Flow, West-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
2.1 328 0.0270 2.65 Shallow Concentrated Flow, West Shallow1
Unpaved Kv= 16.1 fps
2.8 540 0.0396 3.20 Shallow Concentrated Flow, W-Shallow2
Unpaved Kv= 16.1 fps
16.5 918 Total
Subcatchment W1: Pre. West WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Charlotte 6-hr 2-yr
25-yr Rainfall=4.38"
Runoff Area=8.390 ac
Runoff Volume=48,405 cf
Runoff Depth=1.59"
Flow Length=918'
Tc=16.5 min
CN=70
20.04 cfs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 91HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W1: Pre. West WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.18 0.00 0.00
2.00 0.48 0.00 0.00
3.00 1.71 0.14 1.46
4.00 3.86 1.24 3.60
5.00 4.18 1.45 1.51
6.00 4.38 1.59 1.07
7.00 4.38 1.59 0.00
8.00 4.38 1.59 0.00
9.00 4.38 1.59 0.00
10.00 4.38 1.59 0.00
11.00 4.38 1.59 0.00
12.00 4.38 1.59 0.00
13.00 4.38 1.59 0.00
14.00 4.38 1.59 0.00
15.00 4.38 1.59 0.00
16.00 4.38 1.59 0.00
17.00 4.38 1.59 0.00
18.00 4.38 1.59 0.00
19.00 4.38 1.59 0.00
20.00 4.38 1.59 0.00
21.00 4.38 1.59 0.00
22.00 4.38 1.59 0.00
23.00 4.38 1.59 0.00
24.00 4.38 1.59 0.00
25.00 4.38 1.59 0.00
26.00 4.38 1.59 0.00
27.00 4.38 1.59 0.00
28.00 4.38 1.59 0.00
29.00 4.38 1.59 0.00
30.00 4.38 1.59 0.00
31.00 4.38 1.59 0.00
32.00 4.38 1.59 0.00
33.00 4.38 1.59 0.00
34.00 4.38 1.59 0.00
35.00 4.38 1.59 0.00
36.00 4.38 1.59 0.00
37.00 4.38 1.59 0.00
38.00 4.38 1.59 0.00
39.00 4.38 1.59 0.00
40.00 4.38 1.59 0.00
41.00 4.38 1.59 0.00
42.00 4.38 1.59 0.00
43.00 4.38 1.59 0.00
44.00 4.38 1.59 0.00
45.00 4.38 1.59 0.00
46.00 4.38 1.59 0.00
47.00 4.38 1.59 0.00
48.00 4.38 1.59 0.00
49.00 4.38 1.59 0.00
50.00 4.38 1.59 0.00
51.00 4.38 1.59 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 4.38 1.59 0.00
53.00 4.38 1.59 0.00
54.00 4.38 1.59 0.00
55.00 4.38 1.59 0.00
56.00 4.38 1.59 0.00
57.00 4.38 1.59 0.00
58.00 4.38 1.59 0.00
59.00 4.38 1.59 0.00
60.00 4.38 1.59 0.00
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 92HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W1-A: Pre. West WS
Runoff = 10.01 cfs @ 3.32 hrs, Volume= 24,173 cf, Depth= 1.59"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"
Area (ac) CN Description
4.190 70 Woods, Good, HSG C
4.190 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
11.6 50 0.0243 0.07 Sheet Flow, West-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
2.1 328 0.0270 2.65 Shallow Concentrated Flow, West Shallow1
Unpaved Kv= 16.1 fps
2.8 540 0.0396 3.20 Shallow Concentrated Flow, W-Shallow2
Unpaved Kv= 16.1 fps
16.5 918 Total
Subcatchment W1-A: Pre. West WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)11
10
9
8
7
6
5
4
3
2
1
0
Charlotte 6-hr 2-yr
25-yr Rainfall=4.38"
Runoff Area=4.190 ac
Runoff Volume=24,173 cf
Runoff Depth=1.59"
Flow Length=918'
Tc=16.5 min
CN=70
10.01 cfs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 93HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W1-A: Pre. West WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.18 0.00 0.00
2.00 0.48 0.00 0.00
3.00 1.71 0.14 0.73
4.00 3.86 1.24 1.80
5.00 4.18 1.45 0.75
6.00 4.38 1.59 0.54
7.00 4.38 1.59 0.00
8.00 4.38 1.59 0.00
9.00 4.38 1.59 0.00
10.00 4.38 1.59 0.00
11.00 4.38 1.59 0.00
12.00 4.38 1.59 0.00
13.00 4.38 1.59 0.00
14.00 4.38 1.59 0.00
15.00 4.38 1.59 0.00
16.00 4.38 1.59 0.00
17.00 4.38 1.59 0.00
18.00 4.38 1.59 0.00
19.00 4.38 1.59 0.00
20.00 4.38 1.59 0.00
21.00 4.38 1.59 0.00
22.00 4.38 1.59 0.00
23.00 4.38 1.59 0.00
24.00 4.38 1.59 0.00
25.00 4.38 1.59 0.00
26.00 4.38 1.59 0.00
27.00 4.38 1.59 0.00
28.00 4.38 1.59 0.00
29.00 4.38 1.59 0.00
30.00 4.38 1.59 0.00
31.00 4.38 1.59 0.00
32.00 4.38 1.59 0.00
33.00 4.38 1.59 0.00
34.00 4.38 1.59 0.00
35.00 4.38 1.59 0.00
36.00 4.38 1.59 0.00
37.00 4.38 1.59 0.00
38.00 4.38 1.59 0.00
39.00 4.38 1.59 0.00
40.00 4.38 1.59 0.00
41.00 4.38 1.59 0.00
42.00 4.38 1.59 0.00
43.00 4.38 1.59 0.00
44.00 4.38 1.59 0.00
45.00 4.38 1.59 0.00
46.00 4.38 1.59 0.00
47.00 4.38 1.59 0.00
48.00 4.38 1.59 0.00
49.00 4.38 1.59 0.00
50.00 4.38 1.59 0.00
51.00 4.38 1.59 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 4.38 1.59 0.00
53.00 4.38 1.59 0.00
54.00 4.38 1.59 0.00
55.00 4.38 1.59 0.00
56.00 4.38 1.59 0.00
57.00 4.38 1.59 0.00
58.00 4.38 1.59 0.00
59.00 4.38 1.59 0.00
60.00 4.38 1.59 0.00
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 94HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W3: West Onsite Bypass
Runoff = 7.02 cfs @ 3.53 hrs, Volume= 24,231 cf, Depth= 1.59"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"
Area (ac) CN Description
4.200 70 Woods, Good, HSG C
4.200 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.5 264 0.0550 0.14 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
Subcatchment W3: West Onsite Bypass
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)7
6
5
4
3
2
1
0
Charlotte 6-hr 2-yr
25-yr Rainfall=4.38"
Runoff Area=4.200 ac
Runoff Volume=24,231 cf
Runoff Depth=1.59"
Flow Length=264'
Slope=0.0550 '/'
Tc=31.5 min
CN=70
7.02 cfs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 95HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W3: West Onsite Bypass
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.18 0.00 0.00
2.00 0.48 0.00 0.00
3.00 1.71 0.14 0.16
4.00 3.86 1.24 3.11
5.00 4.18 1.45 0.91
6.00 4.38 1.59 0.57
7.00 4.38 1.59 0.02
8.00 4.38 1.59 0.00
9.00 4.38 1.59 0.00
10.00 4.38 1.59 0.00
11.00 4.38 1.59 0.00
12.00 4.38 1.59 0.00
13.00 4.38 1.59 0.00
14.00 4.38 1.59 0.00
15.00 4.38 1.59 0.00
16.00 4.38 1.59 0.00
17.00 4.38 1.59 0.00
18.00 4.38 1.59 0.00
19.00 4.38 1.59 0.00
20.00 4.38 1.59 0.00
21.00 4.38 1.59 0.00
22.00 4.38 1.59 0.00
23.00 4.38 1.59 0.00
24.00 4.38 1.59 0.00
25.00 4.38 1.59 0.00
26.00 4.38 1.59 0.00
27.00 4.38 1.59 0.00
28.00 4.38 1.59 0.00
29.00 4.38 1.59 0.00
30.00 4.38 1.59 0.00
31.00 4.38 1.59 0.00
32.00 4.38 1.59 0.00
33.00 4.38 1.59 0.00
34.00 4.38 1.59 0.00
35.00 4.38 1.59 0.00
36.00 4.38 1.59 0.00
37.00 4.38 1.59 0.00
38.00 4.38 1.59 0.00
39.00 4.38 1.59 0.00
40.00 4.38 1.59 0.00
41.00 4.38 1.59 0.00
42.00 4.38 1.59 0.00
43.00 4.38 1.59 0.00
44.00 4.38 1.59 0.00
45.00 4.38 1.59 0.00
46.00 4.38 1.59 0.00
47.00 4.38 1.59 0.00
48.00 4.38 1.59 0.00
49.00 4.38 1.59 0.00
50.00 4.38 1.59 0.00
51.00 4.38 1.59 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 4.38 1.59 0.00
53.00 4.38 1.59 0.00
54.00 4.38 1.59 0.00
55.00 4.38 1.59 0.00
56.00 4.38 1.59 0.00
57.00 4.38 1.59 0.00
58.00 4.38 1.59 0.00
59.00 4.38 1.59 0.00
60.00 4.38 1.59 0.00
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 96HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Pond 1P: West Basin
Inflow Area = 182,604 sf, 49.90% Impervious, Inflow Depth = 2.89" for 25-yr event
Inflow = 24.38 cfs @ 3.19 hrs, Volume= 44,021 cf
Outflow = 5.88 cfs @ 3.47 hrs, Volume= 37,232 cf, Atten= 76%, Lag= 17.0 min
Primary = 5.88 cfs @ 3.47 hrs, Volume= 37,232 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Peak Elev= 639.60' @ 3.47 hrs Surf.Area= 15,012 sf Storage= 24,587 cf
Plug-Flow detention time= 274.3 min calculated for 37,201 cf (85% of inflow)
Center-of-Mass det. time= 260.7 min ( 471.8 - 211.1 )
Volume Invert Avail.Storage Storage Description
#1 637.50' 67,620 cf Custom Stage Data (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
637.50 7,400 0 0
638.00 11,122 4,631 4,631
639.00 12,383 11,753 16,383
640.00 16,772 14,578 30,961
641.00 18,330 17,551 48,512
642.00 19,887 19,109 67,620
Device Routing Invert Outlet Devices
#1 Primary 636.70'24.0" Round Culvert
L= 40.9' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 636.70' / 636.50' S= 0.0049 '/' Cc= 0.900
n= 0.013, Flow Area= 3.14 sf
#2 Device 1 637.50'1.0" Vert. Orifice/Grate C= 0.600
#3 Device 1 638.55'24.0" W x 9.0" H Vert. Orifice/Grate C= 0.600
#4 Secondary 641.50'10.0' 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
Primary OutFlow Max=5.88 cfs @ 3.47 hrs HW=639.60' (Free Discharge)
1=Culvert (Passes 5.88 cfs of 18.63 cfs potential flow)
2=Orifice/Grate (Orifice Controls 0.04 cfs @ 6.90 fps)
3=Orifice/Grate (Orifice Controls 5.84 cfs @ 3.89 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=637.50' (Free Discharge)
4=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 97HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Pond 1P: West Basin
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)26
24
22
20
18
16
14
12
10
8
6
4
2
0
Inflow Area=182,604 sf
Peak Elev=639.60'
Storage=24,587 cf
24.38 cfs
5.88 cfs
5.88 cfs
0.00 cfs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 98HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Pond 1P: West Basin
Time
(hours)
Inflow
(cfs)
Storage
(cubic-feet)
Elevation
(feet)
Outflow
(cfs)
Primary
(cfs)
Secondary
(cfs)
0.00 0.00 0 637.50 0.00 0.00 0.00
2.50 0.87 977 637.62 0.01 0.01 0.00
5.00 0.92 15,759 638.95 1.65 1.65 0.00
7.50 0.00 11,956 638.64 0.19 0.19 0.00
10.00 0.00 11,136 638.57 0.05 0.05 0.00
12.50 0.00 10,850 638.54 0.03 0.03 0.00
15.00 0.00 10,615 638.52 0.03 0.03 0.00
17.50 0.00 10,382 638.50 0.03 0.03 0.00
20.00 0.00 10,152 638.48 0.03 0.03 0.00
22.50 0.00 9,923 638.46 0.03 0.03 0.00
25.00 0.00 9,698 638.44 0.02 0.02 0.00
27.50 0.00 9,474 638.43 0.02 0.02 0.00
30.00 0.00 9,253 638.41 0.02 0.02 0.00
32.50 0.00 9,035 638.39 0.02 0.02 0.00
35.00 0.00 8,819 638.37 0.02 0.02 0.00
37.50 0.00 8,605 638.35 0.02 0.02 0.00
40.00 0.00 8,394 638.33 0.02 0.02 0.00
42.50 0.00 8,185 638.31 0.02 0.02 0.00
45.00 0.00 7,978 638.30 0.02 0.02 0.00
47.50 0.00 7,774 638.28 0.02 0.02 0.00
50.00 0.00 7,573 638.26 0.02 0.02 0.00
52.50 0.00 7,373 638.24 0.02 0.02 0.00
55.00 0.00 7,177 638.23 0.02 0.02 0.00
57.50 0.00 6,982 638.21 0.02 0.02 0.00
60.00 0.00 6,791 638.19 0.02 0.02 0.00
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 99HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Pond 5P: Prop Retention Pond East
Inflow Area = 821,106 sf, 44.60% Impervious, Inflow Depth = 2.19" for 25-yr event
Inflow = 39.25 cfs @ 3.61 hrs, Volume= 150,134 cf
Outflow = 10.82 cfs @ 4.43 hrs, Volume= 98,014 cf, Atten= 72%, Lag= 49.1 min
Primary = 0.20 cfs @ 4.43 hrs, Volume= 34,688 cf
Secondary = 10.62 cfs @ 4.43 hrs, Volume= 63,326 cf
Tertiary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Peak Elev= 638.23' @ 4.43 hrs Surf.Area= 32,155 sf Storage= 100,108 cf
Plug-Flow detention time= 633.9 min calculated for 98,014 cf (65% of inflow)
Center-of-Mass det. time= 606.0 min ( 852.3 - 246.3 )
Volume Invert Avail.Storage Storage Description
#1 634.50' 161,487 cf East Wet Ponds (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
634.50 19,267 0 0
635.00 23,340 10,652 10,652
636.00 25,936 24,638 35,290
637.00 28,646 27,291 62,581
638.00 31,469 30,058 92,638
639.00 34,391 32,930 125,568
640.00 37,447 35,919 161,487
Device Routing Invert Outlet Devices
#1 Primary 634.50'2.0" Vert. Orifice/Grate C= 0.600
#2 Secondary 637.68'24.0" W x 9.0" H Vert. Orifice/Grate X 4.00 C= 0.600
#3 Tertiary 639.50'10.0' 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
Primary OutFlow Max=0.20 cfs @ 4.43 hrs HW=638.23' (Free Discharge)
1=Orifice/Grate (Orifice Controls 0.20 cfs @ 9.20 fps)
Secondary OutFlow Max=10.60 cfs @ 4.43 hrs HW=638.23' (Free Discharge)
2=Orifice/Grate (Orifice Controls 10.60 cfs @ 2.39 fps)
Tertiary OutFlow Max=0.00 cfs @ 0.00 hrs HW=634.50' (Free Discharge)
3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 100HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Pond 5P: Prop Retention Pond East
Inflow
Outflow
Primary
Secondary
Tertiary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Inflow Area=821,106 sf
Peak Elev=638.23'
Storage=100,108 cf
39.25 cfs
10.82 cfs
0.20 cfs
10.62 cfs
0.00 cfs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 101HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Pond 5P: Prop Retention Pond East
Time
(hours)
Inflow
(cfs)
Storage
(cubic-feet)
Elevation
(feet)
Outflow
(cfs)
Primary
(cfs)
Secondary
(cfs)
Tertiary
(cfs)
0.00 0.00 0 634.50 0.00 0.00 0.00 0.00
2.50 0.04 10 634.50 0.00 0.00 0.00 0.00
5.00 5.64 96,489 638.12 7.74 0.20 7.54 0.00
7.50 0.04 85,224 637.76 0.81 0.19 0.62 0.00
10.00 0.00 82,307 637.67 0.18 0.18 0.00 0.00
12.50 0.00 80,654 637.61 0.18 0.18 0.00 0.00
15.00 0.00 79,016 637.56 0.18 0.18 0.00 0.00
17.50 0.00 77,392 637.50 0.18 0.18 0.00 0.00
20.00 0.00 75,784 637.45 0.18 0.18 0.00 0.00
22.50 0.00 74,191 637.40 0.18 0.18 0.00 0.00
25.00 0.00 72,612 637.34 0.17 0.17 0.00 0.00
27.50 0.00 71,049 637.29 0.17 0.17 0.00 0.00
30.00 0.00 69,501 637.24 0.17 0.17 0.00 0.00
32.50 0.00 67,968 637.19 0.17 0.17 0.00 0.00
35.00 0.00 66,450 637.13 0.17 0.17 0.00 0.00
37.50 0.00 64,948 637.08 0.17 0.17 0.00 0.00
40.00 0.00 63,461 637.03 0.16 0.16 0.00 0.00
42.50 0.00 61,990 636.98 0.16 0.16 0.00 0.00
45.00 0.00 60,534 636.93 0.16 0.16 0.00 0.00
47.50 0.00 59,094 636.88 0.16 0.16 0.00 0.00
50.00 0.00 57,670 636.83 0.16 0.16 0.00 0.00
52.50 0.00 56,262 636.78 0.16 0.16 0.00 0.00
55.00 0.00 54,870 636.73 0.15 0.15 0.00 0.00
57.50 0.00 53,494 636.68 0.15 0.15 0.00 0.00
60.00 0.00 52,133 636.63 0.15 0.15 0.00 0.00
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 102HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Link 1L: (new Link)
Inflow Area = 365,556 sf, 24.93% Impervious, Inflow Depth > 2.02" for 25-yr event
Inflow = 12.87 cfs @ 3.52 hrs, Volume= 61,463 cf
Primary = 12.87 cfs @ 3.52 hrs, Volume= 61,463 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Link 1L: (new Link)
Inflow
Primary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Inflow Area=365,556 sf
12.87 cfs
12.87 cfs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 103HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Link 1L: (new Link)
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
0.00 0.00 0.00 0.00
1.00 0.00 0.00 0.00
2.00 0.00 0.00 0.00
3.00 0.18 0.00 0.18
4.00 7.51 0.00 7.51
5.00 2.56 0.00 2.56
6.00 1.51 0.00 1.51
7.00 0.32 0.00 0.32
8.00 0.13 0.00 0.13
9.00 0.07 0.00 0.07
10.00 0.05 0.00 0.05
11.00 0.03 0.00 0.03
12.00 0.03 0.00 0.03
13.00 0.03 0.00 0.03
14.00 0.03 0.00 0.03
15.00 0.03 0.00 0.03
16.00 0.03 0.00 0.03
17.00 0.03 0.00 0.03
18.00 0.03 0.00 0.03
19.00 0.03 0.00 0.03
20.00 0.03 0.00 0.03
21.00 0.03 0.00 0.03
22.00 0.03 0.00 0.03
23.00 0.03 0.00 0.03
24.00 0.03 0.00 0.03
25.00 0.02 0.00 0.02
26.00 0.02 0.00 0.02
27.00 0.02 0.00 0.02
28.00 0.02 0.00 0.02
29.00 0.02 0.00 0.02
30.00 0.02 0.00 0.02
31.00 0.02 0.00 0.02
32.00 0.02 0.00 0.02
33.00 0.02 0.00 0.02
34.00 0.02 0.00 0.02
35.00 0.02 0.00 0.02
36.00 0.02 0.00 0.02
37.00 0.02 0.00 0.02
38.00 0.02 0.00 0.02
39.00 0.02 0.00 0.02
40.00 0.02 0.00 0.02
41.00 0.02 0.00 0.02
42.00 0.02 0.00 0.02
43.00 0.02 0.00 0.02
44.00 0.02 0.00 0.02
45.00 0.02 0.00 0.02
46.00 0.02 0.00 0.02
47.00 0.02 0.00 0.02
48.00 0.02 0.00 0.02
49.00 0.02 0.00 0.02
50.00 0.02 0.00 0.02
51.00 0.02 0.00 0.02
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
52.00 0.02 0.00 0.02
53.00 0.02 0.00 0.02
54.00 0.02 0.00 0.02
55.00 0.02 0.00 0.02
56.00 0.02 0.00 0.02
57.00 0.02 0.00 0.02
58.00 0.02 0.00 0.02
59.00 0.02 0.00 0.02
60.00 0.02 0.00 0.02
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 104HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Link 6L: East Post Comb
Inflow Area = 964,418 sf, 37.97% Impervious, Inflow Depth > 0.67" for 25-yr event
Inflow = 10.65 cfs @ 3.20 hrs, Volume= 53,669 cf
Primary = 10.65 cfs @ 3.20 hrs, Volume= 53,669 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Link 6L: East Post Comb
Inflow
Primary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)11
10
9
8
7
6
5
4
3
2
1
0
Inflow Area=964,418 sf
10.65 cfs
10.65 cfs
Charlotte 6-hr 2-yr 25-yr Rainfall=4.38"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 105HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Link 6L: East Post Comb
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
0.00 0.00 0.00 0.00
1.00 0.00 0.00 0.00
2.00 0.00 0.00 0.00
3.00 1.64 0.00 1.64
4.00 1.37 0.00 1.37
5.00 0.74 0.00 0.74
6.00 0.59 0.00 0.59
7.00 0.19 0.00 0.19
8.00 0.19 0.00 0.19
9.00 0.19 0.00 0.19
10.00 0.18 0.00 0.18
11.00 0.18 0.00 0.18
12.00 0.18 0.00 0.18
13.00 0.18 0.00 0.18
14.00 0.18 0.00 0.18
15.00 0.18 0.00 0.18
16.00 0.18 0.00 0.18
17.00 0.18 0.00 0.18
18.00 0.18 0.00 0.18
19.00 0.18 0.00 0.18
20.00 0.18 0.00 0.18
21.00 0.18 0.00 0.18
22.00 0.18 0.00 0.18
23.00 0.18 0.00 0.18
24.00 0.18 0.00 0.18
25.00 0.17 0.00 0.17
26.00 0.17 0.00 0.17
27.00 0.17 0.00 0.17
28.00 0.17 0.00 0.17
29.00 0.17 0.00 0.17
30.00 0.17 0.00 0.17
31.00 0.17 0.00 0.17
32.00 0.17 0.00 0.17
33.00 0.17 0.00 0.17
34.00 0.17 0.00 0.17
35.00 0.17 0.00 0.17
36.00 0.17 0.00 0.17
37.00 0.17 0.00 0.17
38.00 0.17 0.00 0.17
39.00 0.17 0.00 0.17
40.00 0.16 0.00 0.16
41.00 0.16 0.00 0.16
42.00 0.16 0.00 0.16
43.00 0.16 0.00 0.16
44.00 0.16 0.00 0.16
45.00 0.16 0.00 0.16
46.00 0.16 0.00 0.16
47.00 0.16 0.00 0.16
48.00 0.16 0.00 0.16
49.00 0.16 0.00 0.16
50.00 0.16 0.00 0.16
51.00 0.16 0.00 0.16
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
52.00 0.16 0.00 0.16
53.00 0.16 0.00 0.16
54.00 0.15 0.00 0.15
55.00 0.15 0.00 0.15
56.00 0.15 0.00 0.15
57.00 0.15 0.00 0.15
58.00 0.15 0.00 0.15
59.00 0.15 0.00 0.15
60.00 0.15 0.00 0.15
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 106HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment 3S: West Post
Runoff = 28.40 cfs @ 3.19 hrs, Volume= 51,622 cf, Depth= 3.39"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"
Area (ac) CN Description
2.092 98 Paved parking, HSG C
2.100 74 >75% Grass cover, Good, HSG C
4.192 86 Weighted Average
2.100 50.10% Pervious Area
2.092 49.90% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
7.5 Direct Entry, Min Tc
Subcatchment 3S: West Post
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Charlotte 6-hr 2-yr
50 yr Rainfall=4.92"
Runoff Area=4.192 ac
Runoff Volume=51,622 cf
Runoff Depth=3.39"
Tc=7.5 min
CN=86
28.40 cfs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 107HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment 3S: West Post
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.20 0.00 0.00
2.00 0.54 0.02 0.31
3.00 1.92 0.79 8.21
4.00 4.34 2.86 2.38
5.00 4.70 3.19 1.05
6.00 4.92 3.39 0.75
7.00 4.92 3.39 0.00
8.00 4.92 3.39 0.00
9.00 4.92 3.39 0.00
10.00 4.92 3.39 0.00
11.00 4.92 3.39 0.00
12.00 4.92 3.39 0.00
13.00 4.92 3.39 0.00
14.00 4.92 3.39 0.00
15.00 4.92 3.39 0.00
16.00 4.92 3.39 0.00
17.00 4.92 3.39 0.00
18.00 4.92 3.39 0.00
19.00 4.92 3.39 0.00
20.00 4.92 3.39 0.00
21.00 4.92 3.39 0.00
22.00 4.92 3.39 0.00
23.00 4.92 3.39 0.00
24.00 4.92 3.39 0.00
25.00 4.92 3.39 0.00
26.00 4.92 3.39 0.00
27.00 4.92 3.39 0.00
28.00 4.92 3.39 0.00
29.00 4.92 3.39 0.00
30.00 4.92 3.39 0.00
31.00 4.92 3.39 0.00
32.00 4.92 3.39 0.00
33.00 4.92 3.39 0.00
34.00 4.92 3.39 0.00
35.00 4.92 3.39 0.00
36.00 4.92 3.39 0.00
37.00 4.92 3.39 0.00
38.00 4.92 3.39 0.00
39.00 4.92 3.39 0.00
40.00 4.92 3.39 0.00
41.00 4.92 3.39 0.00
42.00 4.92 3.39 0.00
43.00 4.92 3.39 0.00
44.00 4.92 3.39 0.00
45.00 4.92 3.39 0.00
46.00 4.92 3.39 0.00
47.00 4.92 3.39 0.00
48.00 4.92 3.39 0.00
49.00 4.92 3.39 0.00
50.00 4.92 3.39 0.00
51.00 4.92 3.39 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 4.92 3.39 0.00
53.00 4.92 3.39 0.00
54.00 4.92 3.39 0.00
55.00 4.92 3.39 0.00
56.00 4.92 3.39 0.00
57.00 4.92 3.39 0.00
58.00 4.92 3.39 0.00
59.00 4.92 3.39 0.00
60.00 4.92 3.39 0.00
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 108HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E1: Pre. East WS
Runoff = 32.12 cfs @ 3.88 hrs, Volume= 161,129 cf, Depth= 1.98"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"
Area (ac) CN Description
22.450 70 Woods, Good, HSG C
22.450 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
49.7 270 0.0185 0.09 Sheet Flow, East-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
7.3 940 0.0176 2.14 Shallow Concentrated Flow, West Shallow
Unpaved Kv= 16.1 fps
57.0 1,210 Total
Subcatchment E1: Pre. East WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Charlotte 6-hr 2-yr
50 yr Rainfall=4.92"
Runoff Area=22.450 ac
Runoff Volume=161,129 cf
Runoff Depth=1.98"
Flow Length=1,210'
Tc=57.0 min
CN=70
32.12 cfs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 109HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E1: Pre. East WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.20 0.00 0.00
2.00 0.54 0.00 0.00
3.00 1.92 0.21 0.32
4.00 4.34 1.56 30.94
5.00 4.70 1.82 9.54
6.00 4.92 1.98 4.45
7.00 4.92 1.98 1.09
8.00 4.92 1.98 0.08
9.00 4.92 1.98 0.00
10.00 4.92 1.98 0.00
11.00 4.92 1.98 0.00
12.00 4.92 1.98 0.00
13.00 4.92 1.98 0.00
14.00 4.92 1.98 0.00
15.00 4.92 1.98 0.00
16.00 4.92 1.98 0.00
17.00 4.92 1.98 0.00
18.00 4.92 1.98 0.00
19.00 4.92 1.98 0.00
20.00 4.92 1.98 0.00
21.00 4.92 1.98 0.00
22.00 4.92 1.98 0.00
23.00 4.92 1.98 0.00
24.00 4.92 1.98 0.00
25.00 4.92 1.98 0.00
26.00 4.92 1.98 0.00
27.00 4.92 1.98 0.00
28.00 4.92 1.98 0.00
29.00 4.92 1.98 0.00
30.00 4.92 1.98 0.00
31.00 4.92 1.98 0.00
32.00 4.92 1.98 0.00
33.00 4.92 1.98 0.00
34.00 4.92 1.98 0.00
35.00 4.92 1.98 0.00
36.00 4.92 1.98 0.00
37.00 4.92 1.98 0.00
38.00 4.92 1.98 0.00
39.00 4.92 1.98 0.00
40.00 4.92 1.98 0.00
41.00 4.92 1.98 0.00
42.00 4.92 1.98 0.00
43.00 4.92 1.98 0.00
44.00 4.92 1.98 0.00
45.00 4.92 1.98 0.00
46.00 4.92 1.98 0.00
47.00 4.92 1.98 0.00
48.00 4.92 1.98 0.00
49.00 4.92 1.98 0.00
50.00 4.92 1.98 0.00
51.00 4.92 1.98 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 4.92 1.98 0.00
53.00 4.92 1.98 0.00
54.00 4.92 1.98 0.00
55.00 4.92 1.98 0.00
56.00 4.92 1.98 0.00
57.00 4.92 1.98 0.00
58.00 4.92 1.98 0.00
59.00 4.92 1.98 0.00
60.00 4.92 1.98 0.00
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 110HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E1-A: Pre. East WS to BMP
Runoff = 26.97 cfs @ 3.88 hrs, Volume= 135,291 cf, Depth= 1.98"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"
Area (ac) CN Description
18.850 70 Woods, Good, HSG C
18.850 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
49.7 270 0.0185 0.09 Sheet Flow, East-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
7.3 940 0.0176 2.14 Shallow Concentrated Flow, West Shallow
Unpaved Kv= 16.1 fps
57.0 1,210 Total
Subcatchment E1-A: Pre. East WS to BMP
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Charlotte 6-hr 2-yr
50 yr Rainfall=4.92"
Runoff Area=18.850 ac
Runoff Volume=135,291 cf
Runoff Depth=1.98"
Flow Length=1,210'
Tc=57.0 min
CN=70
26.97 cfs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 111HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E1-A: Pre. East WS to BMP
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.20 0.00 0.00
2.00 0.54 0.00 0.00
3.00 1.92 0.21 0.27
4.00 4.34 1.56 25.98
5.00 4.70 1.82 8.01
6.00 4.92 1.98 3.74
7.00 4.92 1.98 0.92
8.00 4.92 1.98 0.06
9.00 4.92 1.98 0.00
10.00 4.92 1.98 0.00
11.00 4.92 1.98 0.00
12.00 4.92 1.98 0.00
13.00 4.92 1.98 0.00
14.00 4.92 1.98 0.00
15.00 4.92 1.98 0.00
16.00 4.92 1.98 0.00
17.00 4.92 1.98 0.00
18.00 4.92 1.98 0.00
19.00 4.92 1.98 0.00
20.00 4.92 1.98 0.00
21.00 4.92 1.98 0.00
22.00 4.92 1.98 0.00
23.00 4.92 1.98 0.00
24.00 4.92 1.98 0.00
25.00 4.92 1.98 0.00
26.00 4.92 1.98 0.00
27.00 4.92 1.98 0.00
28.00 4.92 1.98 0.00
29.00 4.92 1.98 0.00
30.00 4.92 1.98 0.00
31.00 4.92 1.98 0.00
32.00 4.92 1.98 0.00
33.00 4.92 1.98 0.00
34.00 4.92 1.98 0.00
35.00 4.92 1.98 0.00
36.00 4.92 1.98 0.00
37.00 4.92 1.98 0.00
38.00 4.92 1.98 0.00
39.00 4.92 1.98 0.00
40.00 4.92 1.98 0.00
41.00 4.92 1.98 0.00
42.00 4.92 1.98 0.00
43.00 4.92 1.98 0.00
44.00 4.92 1.98 0.00
45.00 4.92 1.98 0.00
46.00 4.92 1.98 0.00
47.00 4.92 1.98 0.00
48.00 4.92 1.98 0.00
49.00 4.92 1.98 0.00
50.00 4.92 1.98 0.00
51.00 4.92 1.98 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 4.92 1.98 0.00
53.00 4.92 1.98 0.00
54.00 4.92 1.98 0.00
55.00 4.92 1.98 0.00
56.00 4.92 1.98 0.00
57.00 4.92 1.98 0.00
58.00 4.92 1.98 0.00
59.00 4.92 1.98 0.00
60.00 4.92 1.98 0.00
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 112HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E2: East Post
Runoff = 47.46 cfs @ 3.61 hrs, Volume= 180,911 cf, Depth= 2.64"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"
Area (ac) CN Description
0.320 70 Woods, Good, HSG C
* 0.390 98 Retention Ponds
* 17.410 78 Residential, 45% imp, HSG C
0.730 80 1/2 acre lots, 25% imp, HSG C
18.850 78 Weighted Average
10.443 55.40% Pervious Area
8.407 44.60% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
32.3 164 0.0200 0.08 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
6.8 1,511 0.0050 3.72 4.57 Pipe Channel, Storm Sewer
15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31'
n= 0.013
39.1 1,675 Total
Subcatchment E2: East Post
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)50
45
40
35
30
25
20
15
10
5
0
Charlotte 6-hr 2-yr
50 yr Rainfall=4.92"
Runoff Area=18.850 ac
Runoff Volume=180,911 cf
Runoff Depth=2.64"
Flow Length=1,675'
Tc=39.1 min
CN=78
47.46 cfs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 113HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E2: East Post
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.20 0.00 0.00
2.00 0.54 0.00 0.00
3.00 1.92 0.44 3.42
4.00 4.34 2.16 26.80
5.00 4.70 2.46 6.57
6.00 4.92 2.64 3.64
7.00 4.92 2.64 0.30
8.00 4.92 2.64 0.00
9.00 4.92 2.64 0.00
10.00 4.92 2.64 0.00
11.00 4.92 2.64 0.00
12.00 4.92 2.64 0.00
13.00 4.92 2.64 0.00
14.00 4.92 2.64 0.00
15.00 4.92 2.64 0.00
16.00 4.92 2.64 0.00
17.00 4.92 2.64 0.00
18.00 4.92 2.64 0.00
19.00 4.92 2.64 0.00
20.00 4.92 2.64 0.00
21.00 4.92 2.64 0.00
22.00 4.92 2.64 0.00
23.00 4.92 2.64 0.00
24.00 4.92 2.64 0.00
25.00 4.92 2.64 0.00
26.00 4.92 2.64 0.00
27.00 4.92 2.64 0.00
28.00 4.92 2.64 0.00
29.00 4.92 2.64 0.00
30.00 4.92 2.64 0.00
31.00 4.92 2.64 0.00
32.00 4.92 2.64 0.00
33.00 4.92 2.64 0.00
34.00 4.92 2.64 0.00
35.00 4.92 2.64 0.00
36.00 4.92 2.64 0.00
37.00 4.92 2.64 0.00
38.00 4.92 2.64 0.00
39.00 4.92 2.64 0.00
40.00 4.92 2.64 0.00
41.00 4.92 2.64 0.00
42.00 4.92 2.64 0.00
43.00 4.92 2.64 0.00
44.00 4.92 2.64 0.00
45.00 4.92 2.64 0.00
46.00 4.92 2.64 0.00
47.00 4.92 2.64 0.00
48.00 4.92 2.64 0.00
49.00 4.92 2.64 0.00
50.00 4.92 2.64 0.00
51.00 4.92 2.64 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 4.92 2.64 0.00
53.00 4.92 2.64 0.00
54.00 4.92 2.64 0.00
55.00 4.92 2.64 0.00
56.00 4.92 2.64 0.00
57.00 4.92 2.64 0.00
58.00 4.92 2.64 0.00
59.00 4.92 2.64 0.00
60.00 4.92 2.64 0.00
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 114HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E3: East Onsite Bypass
Runoff = 13.28 cfs @ 3.20 hrs, Volume= 23,613 cf, Depth= 1.98"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"
Area (ac) CN Description
3.290 70 Woods, Good, HSG C
3.290 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
7.5 Direct Entry, Direct Discharge
Subcatchment E3: East Onsite Bypass
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Charlotte 6-hr 2-yr
50 yr Rainfall=4.92"
Runoff Area=3.290 ac
Runoff Volume=23,613 cf
Runoff Depth=1.98"
Tc=7.5 min
CN=70
13.28 cfs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 115HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E3: East Onsite Bypass
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.20 0.00 0.00
2.00 0.54 0.00 0.00
3.00 1.92 0.21 2.35
4.00 4.34 1.56 1.41
5.00 4.70 1.82 0.64
6.00 4.92 1.98 0.47
7.00 4.92 1.98 0.00
8.00 4.92 1.98 0.00
9.00 4.92 1.98 0.00
10.00 4.92 1.98 0.00
11.00 4.92 1.98 0.00
12.00 4.92 1.98 0.00
13.00 4.92 1.98 0.00
14.00 4.92 1.98 0.00
15.00 4.92 1.98 0.00
16.00 4.92 1.98 0.00
17.00 4.92 1.98 0.00
18.00 4.92 1.98 0.00
19.00 4.92 1.98 0.00
20.00 4.92 1.98 0.00
21.00 4.92 1.98 0.00
22.00 4.92 1.98 0.00
23.00 4.92 1.98 0.00
24.00 4.92 1.98 0.00
25.00 4.92 1.98 0.00
26.00 4.92 1.98 0.00
27.00 4.92 1.98 0.00
28.00 4.92 1.98 0.00
29.00 4.92 1.98 0.00
30.00 4.92 1.98 0.00
31.00 4.92 1.98 0.00
32.00 4.92 1.98 0.00
33.00 4.92 1.98 0.00
34.00 4.92 1.98 0.00
35.00 4.92 1.98 0.00
36.00 4.92 1.98 0.00
37.00 4.92 1.98 0.00
38.00 4.92 1.98 0.00
39.00 4.92 1.98 0.00
40.00 4.92 1.98 0.00
41.00 4.92 1.98 0.00
42.00 4.92 1.98 0.00
43.00 4.92 1.98 0.00
44.00 4.92 1.98 0.00
45.00 4.92 1.98 0.00
46.00 4.92 1.98 0.00
47.00 4.92 1.98 0.00
48.00 4.92 1.98 0.00
49.00 4.92 1.98 0.00
50.00 4.92 1.98 0.00
51.00 4.92 1.98 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 4.92 1.98 0.00
53.00 4.92 1.98 0.00
54.00 4.92 1.98 0.00
55.00 4.92 1.98 0.00
56.00 4.92 1.98 0.00
57.00 4.92 1.98 0.00
58.00 4.92 1.98 0.00
59.00 4.92 1.98 0.00
60.00 4.92 1.98 0.00
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 116HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W1: Pre. West WS
Runoff = 25.19 cfs @ 3.32 hrs, Volume= 60,217 cf, Depth= 1.98"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"
Area (ac) CN Description
8.390 70 Woods, Good, HSG C
8.390 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
11.6 50 0.0243 0.07 Sheet Flow, West-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
2.1 328 0.0270 2.65 Shallow Concentrated Flow, West Shallow1
Unpaved Kv= 16.1 fps
2.8 540 0.0396 3.20 Shallow Concentrated Flow, W-Shallow2
Unpaved Kv= 16.1 fps
16.5 918 Total
Subcatchment W1: Pre. West WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Charlotte 6-hr 2-yr
50 yr Rainfall=4.92"
Runoff Area=8.390 ac
Runoff Volume=60,217 cf
Runoff Depth=1.98"
Flow Length=918'
Tc=16.5 min
CN=70
25.19 cfs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 117HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W1: Pre. West WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.20 0.00 0.00
2.00 0.54 0.00 0.00
3.00 1.92 0.21 2.40
4.00 4.34 1.56 4.31
5.00 4.70 1.82 1.79
6.00 4.92 1.98 1.27
7.00 4.92 1.98 0.00
8.00 4.92 1.98 0.00
9.00 4.92 1.98 0.00
10.00 4.92 1.98 0.00
11.00 4.92 1.98 0.00
12.00 4.92 1.98 0.00
13.00 4.92 1.98 0.00
14.00 4.92 1.98 0.00
15.00 4.92 1.98 0.00
16.00 4.92 1.98 0.00
17.00 4.92 1.98 0.00
18.00 4.92 1.98 0.00
19.00 4.92 1.98 0.00
20.00 4.92 1.98 0.00
21.00 4.92 1.98 0.00
22.00 4.92 1.98 0.00
23.00 4.92 1.98 0.00
24.00 4.92 1.98 0.00
25.00 4.92 1.98 0.00
26.00 4.92 1.98 0.00
27.00 4.92 1.98 0.00
28.00 4.92 1.98 0.00
29.00 4.92 1.98 0.00
30.00 4.92 1.98 0.00
31.00 4.92 1.98 0.00
32.00 4.92 1.98 0.00
33.00 4.92 1.98 0.00
34.00 4.92 1.98 0.00
35.00 4.92 1.98 0.00
36.00 4.92 1.98 0.00
37.00 4.92 1.98 0.00
38.00 4.92 1.98 0.00
39.00 4.92 1.98 0.00
40.00 4.92 1.98 0.00
41.00 4.92 1.98 0.00
42.00 4.92 1.98 0.00
43.00 4.92 1.98 0.00
44.00 4.92 1.98 0.00
45.00 4.92 1.98 0.00
46.00 4.92 1.98 0.00
47.00 4.92 1.98 0.00
48.00 4.92 1.98 0.00
49.00 4.92 1.98 0.00
50.00 4.92 1.98 0.00
51.00 4.92 1.98 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 4.92 1.98 0.00
53.00 4.92 1.98 0.00
54.00 4.92 1.98 0.00
55.00 4.92 1.98 0.00
56.00 4.92 1.98 0.00
57.00 4.92 1.98 0.00
58.00 4.92 1.98 0.00
59.00 4.92 1.98 0.00
60.00 4.92 1.98 0.00
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 118HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W1-A: Pre. West WS
Runoff = 12.58 cfs @ 3.32 hrs, Volume= 30,073 cf, Depth= 1.98"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"
Area (ac) CN Description
4.190 70 Woods, Good, HSG C
4.190 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
11.6 50 0.0243 0.07 Sheet Flow, West-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
2.1 328 0.0270 2.65 Shallow Concentrated Flow, West Shallow1
Unpaved Kv= 16.1 fps
2.8 540 0.0396 3.20 Shallow Concentrated Flow, W-Shallow2
Unpaved Kv= 16.1 fps
16.5 918 Total
Subcatchment W1-A: Pre. West WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Charlotte 6-hr 2-yr
50 yr Rainfall=4.92"
Runoff Area=4.190 ac
Runoff Volume=30,073 cf
Runoff Depth=1.98"
Flow Length=918'
Tc=16.5 min
CN=70
12.58 cfs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 119HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W1-A: Pre. West WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.20 0.00 0.00
2.00 0.54 0.00 0.00
3.00 1.92 0.21 1.20
4.00 4.34 1.56 2.15
5.00 4.70 1.82 0.89
6.00 4.92 1.98 0.64
7.00 4.92 1.98 0.00
8.00 4.92 1.98 0.00
9.00 4.92 1.98 0.00
10.00 4.92 1.98 0.00
11.00 4.92 1.98 0.00
12.00 4.92 1.98 0.00
13.00 4.92 1.98 0.00
14.00 4.92 1.98 0.00
15.00 4.92 1.98 0.00
16.00 4.92 1.98 0.00
17.00 4.92 1.98 0.00
18.00 4.92 1.98 0.00
19.00 4.92 1.98 0.00
20.00 4.92 1.98 0.00
21.00 4.92 1.98 0.00
22.00 4.92 1.98 0.00
23.00 4.92 1.98 0.00
24.00 4.92 1.98 0.00
25.00 4.92 1.98 0.00
26.00 4.92 1.98 0.00
27.00 4.92 1.98 0.00
28.00 4.92 1.98 0.00
29.00 4.92 1.98 0.00
30.00 4.92 1.98 0.00
31.00 4.92 1.98 0.00
32.00 4.92 1.98 0.00
33.00 4.92 1.98 0.00
34.00 4.92 1.98 0.00
35.00 4.92 1.98 0.00
36.00 4.92 1.98 0.00
37.00 4.92 1.98 0.00
38.00 4.92 1.98 0.00
39.00 4.92 1.98 0.00
40.00 4.92 1.98 0.00
41.00 4.92 1.98 0.00
42.00 4.92 1.98 0.00
43.00 4.92 1.98 0.00
44.00 4.92 1.98 0.00
45.00 4.92 1.98 0.00
46.00 4.92 1.98 0.00
47.00 4.92 1.98 0.00
48.00 4.92 1.98 0.00
49.00 4.92 1.98 0.00
50.00 4.92 1.98 0.00
51.00 4.92 1.98 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 4.92 1.98 0.00
53.00 4.92 1.98 0.00
54.00 4.92 1.98 0.00
55.00 4.92 1.98 0.00
56.00 4.92 1.98 0.00
57.00 4.92 1.98 0.00
58.00 4.92 1.98 0.00
59.00 4.92 1.98 0.00
60.00 4.92 1.98 0.00
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 120HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W3: West Onsite Bypass
Runoff = 8.84 cfs @ 3.53 hrs, Volume= 30,144 cf, Depth= 1.98"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"
Area (ac) CN Description
4.200 70 Woods, Good, HSG C
4.200 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.5 264 0.0550 0.14 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
Subcatchment W3: West Onsite Bypass
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)9
8
7
6
5
4
3
2
1
0
Charlotte 6-hr 2-yr
50 yr Rainfall=4.92"
Runoff Area=4.200 ac
Runoff Volume=30,144 cf
Runoff Depth=1.98"
Flow Length=264'
Slope=0.0550 '/'
Tc=31.5 min
CN=70
8.84 cfs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 121HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W3: West Onsite Bypass
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.20 0.00 0.00
2.00 0.54 0.00 0.00
3.00 1.92 0.21 0.33
4.00 4.34 1.56 3.79
5.00 4.70 1.82 1.08
6.00 4.92 1.98 0.67
7.00 4.92 1.98 0.02
8.00 4.92 1.98 0.00
9.00 4.92 1.98 0.00
10.00 4.92 1.98 0.00
11.00 4.92 1.98 0.00
12.00 4.92 1.98 0.00
13.00 4.92 1.98 0.00
14.00 4.92 1.98 0.00
15.00 4.92 1.98 0.00
16.00 4.92 1.98 0.00
17.00 4.92 1.98 0.00
18.00 4.92 1.98 0.00
19.00 4.92 1.98 0.00
20.00 4.92 1.98 0.00
21.00 4.92 1.98 0.00
22.00 4.92 1.98 0.00
23.00 4.92 1.98 0.00
24.00 4.92 1.98 0.00
25.00 4.92 1.98 0.00
26.00 4.92 1.98 0.00
27.00 4.92 1.98 0.00
28.00 4.92 1.98 0.00
29.00 4.92 1.98 0.00
30.00 4.92 1.98 0.00
31.00 4.92 1.98 0.00
32.00 4.92 1.98 0.00
33.00 4.92 1.98 0.00
34.00 4.92 1.98 0.00
35.00 4.92 1.98 0.00
36.00 4.92 1.98 0.00
37.00 4.92 1.98 0.00
38.00 4.92 1.98 0.00
39.00 4.92 1.98 0.00
40.00 4.92 1.98 0.00
41.00 4.92 1.98 0.00
42.00 4.92 1.98 0.00
43.00 4.92 1.98 0.00
44.00 4.92 1.98 0.00
45.00 4.92 1.98 0.00
46.00 4.92 1.98 0.00
47.00 4.92 1.98 0.00
48.00 4.92 1.98 0.00
49.00 4.92 1.98 0.00
50.00 4.92 1.98 0.00
51.00 4.92 1.98 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 4.92 1.98 0.00
53.00 4.92 1.98 0.00
54.00 4.92 1.98 0.00
55.00 4.92 1.98 0.00
56.00 4.92 1.98 0.00
57.00 4.92 1.98 0.00
58.00 4.92 1.98 0.00
59.00 4.92 1.98 0.00
60.00 4.92 1.98 0.00
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 122HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Pond 1P: West Basin
Inflow Area = 182,604 sf, 49.90% Impervious, Inflow Depth = 3.39" for 50 yr event
Inflow = 28.40 cfs @ 3.19 hrs, Volume= 51,622 cf
Outflow = 6.95 cfs @ 3.46 hrs, Volume= 44,827 cf, Atten= 76%, Lag= 16.7 min
Primary = 6.95 cfs @ 3.46 hrs, Volume= 44,827 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Peak Elev= 639.85' @ 3.46 hrs Surf.Area= 16,125 sf Storage= 28,537 cf
Plug-Flow detention time= 239.1 min calculated for 44,827 cf (87% of inflow)
Center-of-Mass det. time= 224.6 min ( 434.5 - 210.0 )
Volume Invert Avail.Storage Storage Description
#1 637.50' 67,620 cf Custom Stage Data (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
637.50 7,400 0 0
638.00 11,122 4,631 4,631
639.00 12,383 11,753 16,383
640.00 16,772 14,578 30,961
641.00 18,330 17,551 48,512
642.00 19,887 19,109 67,620
Device Routing Invert Outlet Devices
#1 Primary 636.70'24.0" Round Culvert
L= 40.9' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 636.70' / 636.50' S= 0.0049 '/' Cc= 0.900
n= 0.013, Flow Area= 3.14 sf
#2 Device 1 637.50'1.0" Vert. Orifice/Grate C= 0.600
#3 Device 1 638.55'24.0" W x 9.0" H Vert. Orifice/Grate C= 0.600
#4 Secondary 641.50'10.0' 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
Primary OutFlow Max=6.94 cfs @ 3.46 hrs HW=639.85' (Free Discharge)
1=Culvert (Passes 6.94 cfs of 20.67 cfs potential flow)
2=Orifice/Grate (Orifice Controls 0.04 cfs @ 7.32 fps)
3=Orifice/Grate (Orifice Controls 6.90 cfs @ 4.60 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=637.50' (Free Discharge)
4=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 123HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Pond 1P: West Basin
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Inflow Area=182,604 sf
Peak Elev=639.85'
Storage=28,537 cf
28.40 cfs
6.95 cfs
6.95 cfs
0.00 cfs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 124HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Pond 1P: West Basin
Time
(hours)
Inflow
(cfs)
Storage
(cubic-feet)
Elevation
(feet)
Outflow
(cfs)
Primary
(cfs)
Secondary
(cfs)
0.00 0.00 0 637.50 0.00 0.00 0.00
2.50 1.14 1,427 637.68 0.01 0.01 0.00
5.00 1.05 16,434 639.00 2.00 2.00 0.00
7.50 0.00 12,020 638.64 0.21 0.21 0.00
10.00 0.00 11,150 638.57 0.05 0.05 0.00
12.50 0.00 10,859 638.54 0.03 0.03 0.00
15.00 0.00 10,623 638.52 0.03 0.03 0.00
17.50 0.00 10,390 638.50 0.03 0.03 0.00
20.00 0.00 10,160 638.48 0.03 0.03 0.00
22.50 0.00 9,932 638.46 0.03 0.03 0.00
25.00 0.00 9,706 638.45 0.02 0.02 0.00
27.50 0.00 9,482 638.43 0.02 0.02 0.00
30.00 0.00 9,261 638.41 0.02 0.02 0.00
32.50 0.00 9,043 638.39 0.02 0.02 0.00
35.00 0.00 8,826 638.37 0.02 0.02 0.00
37.50 0.00 8,612 638.35 0.02 0.02 0.00
40.00 0.00 8,401 638.33 0.02 0.02 0.00
42.50 0.00 8,192 638.31 0.02 0.02 0.00
45.00 0.00 7,986 638.30 0.02 0.02 0.00
47.50 0.00 7,781 638.28 0.02 0.02 0.00
50.00 0.00 7,580 638.26 0.02 0.02 0.00
52.50 0.00 7,380 638.24 0.02 0.02 0.00
55.00 0.00 7,184 638.23 0.02 0.02 0.00
57.50 0.00 6,989 638.21 0.02 0.02 0.00
60.00 0.00 6,797 638.19 0.02 0.02 0.00
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 125HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Pond 5P: Prop Retention Pond East
Inflow Area = 821,106 sf, 44.60% Impervious, Inflow Depth = 2.64" for 50 yr event
Inflow = 47.46 cfs @ 3.61 hrs, Volume= 180,911 cf
Outflow = 17.90 cfs @ 4.22 hrs, Volume= 128,754 cf, Atten= 62%, Lag= 36.8 min
Primary = 0.21 cfs @ 4.22 hrs, Volume= 34,779 cf
Secondary = 17.69 cfs @ 4.22 hrs, Volume= 93,975 cf
Tertiary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Peak Elev= 638.47' @ 4.22 hrs Surf.Area= 32,828 sf Storage= 107,595 cf
Plug-Flow detention time= 491.4 min calculated for 128,647 cf (71% of inflow)
Center-of-Mass det. time= 468.9 min ( 713.9 - 245.0 )
Volume Invert Avail.Storage Storage Description
#1 634.50' 161,487 cf East Wet Ponds (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
634.50 19,267 0 0
635.00 23,340 10,652 10,652
636.00 25,936 24,638 35,290
637.00 28,646 27,291 62,581
638.00 31,469 30,058 92,638
639.00 34,391 32,930 125,568
640.00 37,447 35,919 161,487
Device Routing Invert Outlet Devices
#1 Primary 634.50'2.0" Vert. Orifice/Grate C= 0.600
#2 Secondary 637.68'24.0" W x 9.0" H Vert. Orifice/Grate X 4.00 C= 0.600
#3 Tertiary 639.50'10.0' 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
Primary OutFlow Max=0.21 cfs @ 4.22 hrs HW=638.46' (Free Discharge)
1=Orifice/Grate (Orifice Controls 0.21 cfs @ 9.49 fps)
Secondary OutFlow Max=17.67 cfs @ 4.22 hrs HW=638.46' (Free Discharge)
2=Orifice/Grate (Orifice Controls 17.67 cfs @ 2.94 fps)
Tertiary OutFlow Max=0.00 cfs @ 0.00 hrs HW=634.50' (Free Discharge)
3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 126HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Pond 5P: Prop Retention Pond East
Inflow
Outflow
Primary
Secondary
Tertiary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)50
45
40
35
30
25
20
15
10
5
0
Inflow Area=821,106 sf
Peak Elev=638.47'
Storage=107,595 cf
47.46 cfs
17.90 cfs
0.21 cfs
17.69 cfs
0.00 cfs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 127HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Pond 5P: Prop Retention Pond East
Time
(hours)
Inflow
(cfs)
Storage
(cubic-feet)
Elevation
(feet)
Outflow
(cfs)
Primary
(cfs)
Secondary
(cfs)
Tertiary
(cfs)
0.00 0.00 0 634.50 0.00 0.00 0.00 0.00
2.50 0.17 53 634.50 0.00 0.00 0.00 0.00
5.00 6.57 98,547 638.19 9.45 0.20 9.25 0.00
7.50 0.04 85,433 637.77 0.89 0.19 0.70 0.00
10.00 0.00 82,352 637.67 0.18 0.18 0.00 0.00
12.50 0.00 80,699 637.61 0.18 0.18 0.00 0.00
15.00 0.00 79,061 637.56 0.18 0.18 0.00 0.00
17.50 0.00 77,437 637.51 0.18 0.18 0.00 0.00
20.00 0.00 75,828 637.45 0.18 0.18 0.00 0.00
22.50 0.00 74,234 637.40 0.18 0.18 0.00 0.00
25.00 0.00 72,655 637.35 0.17 0.17 0.00 0.00
27.50 0.00 71,092 637.29 0.17 0.17 0.00 0.00
30.00 0.00 69,543 637.24 0.17 0.17 0.00 0.00
32.50 0.00 68,010 637.19 0.17 0.17 0.00 0.00
35.00 0.00 66,492 637.14 0.17 0.17 0.00 0.00
37.50 0.00 64,989 637.08 0.17 0.17 0.00 0.00
40.00 0.00 63,502 637.03 0.16 0.16 0.00 0.00
42.50 0.00 62,030 636.98 0.16 0.16 0.00 0.00
45.00 0.00 60,574 636.93 0.16 0.16 0.00 0.00
47.50 0.00 59,134 636.88 0.16 0.16 0.00 0.00
50.00 0.00 57,709 636.83 0.16 0.16 0.00 0.00
52.50 0.00 56,301 636.78 0.16 0.16 0.00 0.00
55.00 0.00 54,908 636.73 0.15 0.15 0.00 0.00
57.50 0.00 53,531 636.68 0.15 0.15 0.00 0.00
60.00 0.00 52,171 636.63 0.15 0.15 0.00 0.00
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 128HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Link 1L: (new Link)
Inflow Area = 365,556 sf, 24.93% Impervious, Inflow Depth > 2.46" for 50 yr event
Inflow = 15.76 cfs @ 3.52 hrs, Volume= 74,971 cf
Primary = 15.76 cfs @ 3.52 hrs, Volume= 74,971 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Link 1L: (new Link)
Inflow
Primary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Inflow Area=365,556 sf
15.76 cfs
15.76 cfs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 129HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Link 1L: (new Link)
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
0.00 0.00 0.00 0.00
1.00 0.00 0.00 0.00
2.00 0.00 0.00 0.00
3.00 0.35 0.00 0.35
4.00 9.31 0.00 9.31
5.00 3.07 0.00 3.07
6.00 1.74 0.00 1.74
7.00 0.36 0.00 0.36
8.00 0.14 0.00 0.14
9.00 0.07 0.00 0.07
10.00 0.05 0.00 0.05
11.00 0.03 0.00 0.03
12.00 0.03 0.00 0.03
13.00 0.03 0.00 0.03
14.00 0.03 0.00 0.03
15.00 0.03 0.00 0.03
16.00 0.03 0.00 0.03
17.00 0.03 0.00 0.03
18.00 0.03 0.00 0.03
19.00 0.03 0.00 0.03
20.00 0.03 0.00 0.03
21.00 0.03 0.00 0.03
22.00 0.03 0.00 0.03
23.00 0.03 0.00 0.03
24.00 0.03 0.00 0.03
25.00 0.02 0.00 0.02
26.00 0.02 0.00 0.02
27.00 0.02 0.00 0.02
28.00 0.02 0.00 0.02
29.00 0.02 0.00 0.02
30.00 0.02 0.00 0.02
31.00 0.02 0.00 0.02
32.00 0.02 0.00 0.02
33.00 0.02 0.00 0.02
34.00 0.02 0.00 0.02
35.00 0.02 0.00 0.02
36.00 0.02 0.00 0.02
37.00 0.02 0.00 0.02
38.00 0.02 0.00 0.02
39.00 0.02 0.00 0.02
40.00 0.02 0.00 0.02
41.00 0.02 0.00 0.02
42.00 0.02 0.00 0.02
43.00 0.02 0.00 0.02
44.00 0.02 0.00 0.02
45.00 0.02 0.00 0.02
46.00 0.02 0.00 0.02
47.00 0.02 0.00 0.02
48.00 0.02 0.00 0.02
49.00 0.02 0.00 0.02
50.00 0.02 0.00 0.02
51.00 0.02 0.00 0.02
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
52.00 0.02 0.00 0.02
53.00 0.02 0.00 0.02
54.00 0.02 0.00 0.02
55.00 0.02 0.00 0.02
56.00 0.02 0.00 0.02
57.00 0.02 0.00 0.02
58.00 0.02 0.00 0.02
59.00 0.02 0.00 0.02
60.00 0.02 0.00 0.02
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 130HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Link 6L: East Post Comb
Inflow Area = 964,418 sf, 37.97% Impervious, Inflow Depth > 0.73" for 50 yr event
Inflow = 13.34 cfs @ 3.20 hrs, Volume= 58,392 cf
Primary = 13.34 cfs @ 3.20 hrs, Volume= 58,392 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Link 6L: East Post Comb
Inflow
Primary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Inflow Area=964,418 sf
13.34 cfs
13.34 cfs
Charlotte 6-hr 2-yr 50 yr Rainfall=4.92"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 131HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Link 6L: East Post Comb
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
0.00 0.00 0.00 0.00
1.00 0.00 0.00 0.00
2.00 0.00 0.00 0.00
3.00 2.37 0.00 2.37
4.00 1.61 0.00 1.61
5.00 0.84 0.00 0.84
6.00 0.66 0.00 0.66
7.00 0.19 0.00 0.19
8.00 0.19 0.00 0.19
9.00 0.19 0.00 0.19
10.00 0.18 0.00 0.18
11.00 0.18 0.00 0.18
12.00 0.18 0.00 0.18
13.00 0.18 0.00 0.18
14.00 0.18 0.00 0.18
15.00 0.18 0.00 0.18
16.00 0.18 0.00 0.18
17.00 0.18 0.00 0.18
18.00 0.18 0.00 0.18
19.00 0.18 0.00 0.18
20.00 0.18 0.00 0.18
21.00 0.18 0.00 0.18
22.00 0.18 0.00 0.18
23.00 0.18 0.00 0.18
24.00 0.18 0.00 0.18
25.00 0.17 0.00 0.17
26.00 0.17 0.00 0.17
27.00 0.17 0.00 0.17
28.00 0.17 0.00 0.17
29.00 0.17 0.00 0.17
30.00 0.17 0.00 0.17
31.00 0.17 0.00 0.17
32.00 0.17 0.00 0.17
33.00 0.17 0.00 0.17
34.00 0.17 0.00 0.17
35.00 0.17 0.00 0.17
36.00 0.17 0.00 0.17
37.00 0.17 0.00 0.17
38.00 0.17 0.00 0.17
39.00 0.17 0.00 0.17
40.00 0.16 0.00 0.16
41.00 0.16 0.00 0.16
42.00 0.16 0.00 0.16
43.00 0.16 0.00 0.16
44.00 0.16 0.00 0.16
45.00 0.16 0.00 0.16
46.00 0.16 0.00 0.16
47.00 0.16 0.00 0.16
48.00 0.16 0.00 0.16
49.00 0.16 0.00 0.16
50.00 0.16 0.00 0.16
51.00 0.16 0.00 0.16
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
52.00 0.16 0.00 0.16
53.00 0.16 0.00 0.16
54.00 0.15 0.00 0.15
55.00 0.15 0.00 0.15
56.00 0.15 0.00 0.15
57.00 0.15 0.00 0.15
58.00 0.15 0.00 0.15
59.00 0.15 0.00 0.15
60.00 0.15 0.00 0.15
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 132HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment 3S: West Post
Runoff = 1.51 cfs @ 3.22 hrs, Volume= 3,006 cf, Depth= 0.20"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"
Area (ac) CN Description
2.092 98 Paved parking, HSG C
2.100 74 >75% Grass cover, Good, HSG C
4.192 86 Weighted Average
2.100 50.10% Pervious Area
2.092 49.90% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
7.5 Direct Entry, Min Tc
Subcatchment 3S: West Post
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)1
0
Charlotte 6-hr 2-yr
WQ Rainfall=1.00"
Runoff Area=4.192 ac
Runoff Volume=3,006 cf
Runoff Depth=0.20"
Tc=7.5 min
CN=86
1.51 cfs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 133HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment 3S: West Post
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.04 0.00 0.00
2.00 0.11 0.00 0.00
3.00 0.39 0.00 0.01
4.00 0.88 0.14 0.23
5.00 0.96 0.18 0.11
6.00 1.00 0.20 0.08
7.00 1.00 0.20 0.00
8.00 1.00 0.20 0.00
9.00 1.00 0.20 0.00
10.00 1.00 0.20 0.00
11.00 1.00 0.20 0.00
12.00 1.00 0.20 0.00
13.00 1.00 0.20 0.00
14.00 1.00 0.20 0.00
15.00 1.00 0.20 0.00
16.00 1.00 0.20 0.00
17.00 1.00 0.20 0.00
18.00 1.00 0.20 0.00
19.00 1.00 0.20 0.00
20.00 1.00 0.20 0.00
21.00 1.00 0.20 0.00
22.00 1.00 0.20 0.00
23.00 1.00 0.20 0.00
24.00 1.00 0.20 0.00
25.00 1.00 0.20 0.00
26.00 1.00 0.20 0.00
27.00 1.00 0.20 0.00
28.00 1.00 0.20 0.00
29.00 1.00 0.20 0.00
30.00 1.00 0.20 0.00
31.00 1.00 0.20 0.00
32.00 1.00 0.20 0.00
33.00 1.00 0.20 0.00
34.00 1.00 0.20 0.00
35.00 1.00 0.20 0.00
36.00 1.00 0.20 0.00
37.00 1.00 0.20 0.00
38.00 1.00 0.20 0.00
39.00 1.00 0.20 0.00
40.00 1.00 0.20 0.00
41.00 1.00 0.20 0.00
42.00 1.00 0.20 0.00
43.00 1.00 0.20 0.00
44.00 1.00 0.20 0.00
45.00 1.00 0.20 0.00
46.00 1.00 0.20 0.00
47.00 1.00 0.20 0.00
48.00 1.00 0.20 0.00
49.00 1.00 0.20 0.00
50.00 1.00 0.20 0.00
51.00 1.00 0.20 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 1.00 0.20 0.00
53.00 1.00 0.20 0.00
54.00 1.00 0.20 0.00
55.00 1.00 0.20 0.00
56.00 1.00 0.20 0.00
57.00 1.00 0.20 0.00
58.00 1.00 0.20 0.00
59.00 1.00 0.20 0.00
60.00 1.00 0.20 0.00
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 134HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E1: Pre. East WS
Runoff = 0.05 cfs @ 6.16 hrs, Volume= 376 cf, Depth= 0.00"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"
Area (ac) CN Description
22.450 70 Woods, Good, HSG C
22.450 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
49.7 270 0.0185 0.09 Sheet Flow, East-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
7.3 940 0.0176 2.14 Shallow Concentrated Flow, West Shallow
Unpaved Kv= 16.1 fps
57.0 1,210 Total
Subcatchment E1: Pre. East WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)0.055
0.05
0.045
0.04
0.035
0.03
0.025
0.02
0.015
0.01
0.005
0
Charlotte 6-hr 2-yr
WQ Rainfall=1.00"
Runoff Area=22.450 ac
Runoff Volume=376 cf
Runoff Depth=0.00"
Flow Length=1,210'
Tc=57.0 min
CN=70
0.05 cfs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 135HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E1: Pre. East WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.04 0.00 0.00
2.00 0.11 0.00 0.00
3.00 0.39 0.00 0.00
4.00 0.88 0.00 0.00
5.00 0.96 0.00 0.03
6.00 1.00 0.00 0.05
7.00 1.00 0.00 0.02
8.00 1.00 0.00 0.00
9.00 1.00 0.00 0.00
10.00 1.00 0.00 0.00
11.00 1.00 0.00 0.00
12.00 1.00 0.00 0.00
13.00 1.00 0.00 0.00
14.00 1.00 0.00 0.00
15.00 1.00 0.00 0.00
16.00 1.00 0.00 0.00
17.00 1.00 0.00 0.00
18.00 1.00 0.00 0.00
19.00 1.00 0.00 0.00
20.00 1.00 0.00 0.00
21.00 1.00 0.00 0.00
22.00 1.00 0.00 0.00
23.00 1.00 0.00 0.00
24.00 1.00 0.00 0.00
25.00 1.00 0.00 0.00
26.00 1.00 0.00 0.00
27.00 1.00 0.00 0.00
28.00 1.00 0.00 0.00
29.00 1.00 0.00 0.00
30.00 1.00 0.00 0.00
31.00 1.00 0.00 0.00
32.00 1.00 0.00 0.00
33.00 1.00 0.00 0.00
34.00 1.00 0.00 0.00
35.00 1.00 0.00 0.00
36.00 1.00 0.00 0.00
37.00 1.00 0.00 0.00
38.00 1.00 0.00 0.00
39.00 1.00 0.00 0.00
40.00 1.00 0.00 0.00
41.00 1.00 0.00 0.00
42.00 1.00 0.00 0.00
43.00 1.00 0.00 0.00
44.00 1.00 0.00 0.00
45.00 1.00 0.00 0.00
46.00 1.00 0.00 0.00
47.00 1.00 0.00 0.00
48.00 1.00 0.00 0.00
49.00 1.00 0.00 0.00
50.00 1.00 0.00 0.00
51.00 1.00 0.00 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 1.00 0.00 0.00
53.00 1.00 0.00 0.00
54.00 1.00 0.00 0.00
55.00 1.00 0.00 0.00
56.00 1.00 0.00 0.00
57.00 1.00 0.00 0.00
58.00 1.00 0.00 0.00
59.00 1.00 0.00 0.00
60.00 1.00 0.00 0.00
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 136HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E1-A: Pre. East WS to BMP
Runoff = 0.04 cfs @ 6.16 hrs, Volume= 315 cf, Depth= 0.00"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"
Area (ac) CN Description
18.850 70 Woods, Good, HSG C
18.850 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
49.7 270 0.0185 0.09 Sheet Flow, East-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
7.3 940 0.0176 2.14 Shallow Concentrated Flow, West Shallow
Unpaved Kv= 16.1 fps
57.0 1,210 Total
Subcatchment E1-A: Pre. East WS to BMP
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)0.048
0.046
0.044
0.042
0.04
0.038
0.036
0.034
0.032
0.03
0.028
0.026
0.024
0.022
0.02
0.018
0.016
0.014
0.012
0.01
0.008
0.006
0.004
0.002
0
Charlotte 6-hr 2-yr
WQ Rainfall=1.00"
Runoff Area=18.850 ac
Runoff Volume=315 cf
Runoff Depth=0.00"
Flow Length=1,210'
Tc=57.0 min
CN=70
0.04 cfs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 137HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E1-A: Pre. East WS to BMP
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.04 0.00 0.00
2.00 0.11 0.00 0.00
3.00 0.39 0.00 0.00
4.00 0.88 0.00 0.00
5.00 0.96 0.00 0.03
6.00 1.00 0.00 0.04
7.00 1.00 0.00 0.01
8.00 1.00 0.00 0.00
9.00 1.00 0.00 0.00
10.00 1.00 0.00 0.00
11.00 1.00 0.00 0.00
12.00 1.00 0.00 0.00
13.00 1.00 0.00 0.00
14.00 1.00 0.00 0.00
15.00 1.00 0.00 0.00
16.00 1.00 0.00 0.00
17.00 1.00 0.00 0.00
18.00 1.00 0.00 0.00
19.00 1.00 0.00 0.00
20.00 1.00 0.00 0.00
21.00 1.00 0.00 0.00
22.00 1.00 0.00 0.00
23.00 1.00 0.00 0.00
24.00 1.00 0.00 0.00
25.00 1.00 0.00 0.00
26.00 1.00 0.00 0.00
27.00 1.00 0.00 0.00
28.00 1.00 0.00 0.00
29.00 1.00 0.00 0.00
30.00 1.00 0.00 0.00
31.00 1.00 0.00 0.00
32.00 1.00 0.00 0.00
33.00 1.00 0.00 0.00
34.00 1.00 0.00 0.00
35.00 1.00 0.00 0.00
36.00 1.00 0.00 0.00
37.00 1.00 0.00 0.00
38.00 1.00 0.00 0.00
39.00 1.00 0.00 0.00
40.00 1.00 0.00 0.00
41.00 1.00 0.00 0.00
42.00 1.00 0.00 0.00
43.00 1.00 0.00 0.00
44.00 1.00 0.00 0.00
45.00 1.00 0.00 0.00
46.00 1.00 0.00 0.00
47.00 1.00 0.00 0.00
48.00 1.00 0.00 0.00
49.00 1.00 0.00 0.00
50.00 1.00 0.00 0.00
51.00 1.00 0.00 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 1.00 0.00 0.00
53.00 1.00 0.00 0.00
54.00 1.00 0.00 0.00
55.00 1.00 0.00 0.00
56.00 1.00 0.00 0.00
57.00 1.00 0.00 0.00
58.00 1.00 0.00 0.00
59.00 1.00 0.00 0.00
60.00 1.00 0.00 0.00
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 138HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E2: East Post
Runoff = 0.64 cfs @ 3.89 hrs, Volume= 3,993 cf, Depth= 0.06"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"
Area (ac) CN Description
0.320 70 Woods, Good, HSG C
* 0.390 98 Retention Ponds
* 17.410 78 Residential, 45% imp, HSG C
0.730 80 1/2 acre lots, 25% imp, HSG C
18.850 78 Weighted Average
10.443 55.40% Pervious Area
8.407 44.60% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
32.3 164 0.0200 0.08 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
6.8 1,511 0.0050 3.72 4.57 Pipe Channel, Storm Sewer
15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31'
n= 0.013
39.1 1,675 Total
Subcatchment E2: East Post
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)0.7
0.65
0.6
0.55
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
Charlotte 6-hr 2-yr
WQ Rainfall=1.00"
Runoff Area=18.850 ac
Runoff Volume=3,993 cf
Runoff Depth=0.06"
Flow Length=1,675'
Tc=39.1 min
CN=78
0.64 cfs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 139HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E2: East Post
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.04 0.00 0.00
2.00 0.11 0.00 0.00
3.00 0.39 0.00 0.00
4.00 0.88 0.03 0.62
5.00 0.96 0.05 0.32
6.00 1.00 0.06 0.21
7.00 1.00 0.06 0.02
8.00 1.00 0.06 0.00
9.00 1.00 0.06 0.00
10.00 1.00 0.06 0.00
11.00 1.00 0.06 0.00
12.00 1.00 0.06 0.00
13.00 1.00 0.06 0.00
14.00 1.00 0.06 0.00
15.00 1.00 0.06 0.00
16.00 1.00 0.06 0.00
17.00 1.00 0.06 0.00
18.00 1.00 0.06 0.00
19.00 1.00 0.06 0.00
20.00 1.00 0.06 0.00
21.00 1.00 0.06 0.00
22.00 1.00 0.06 0.00
23.00 1.00 0.06 0.00
24.00 1.00 0.06 0.00
25.00 1.00 0.06 0.00
26.00 1.00 0.06 0.00
27.00 1.00 0.06 0.00
28.00 1.00 0.06 0.00
29.00 1.00 0.06 0.00
30.00 1.00 0.06 0.00
31.00 1.00 0.06 0.00
32.00 1.00 0.06 0.00
33.00 1.00 0.06 0.00
34.00 1.00 0.06 0.00
35.00 1.00 0.06 0.00
36.00 1.00 0.06 0.00
37.00 1.00 0.06 0.00
38.00 1.00 0.06 0.00
39.00 1.00 0.06 0.00
40.00 1.00 0.06 0.00
41.00 1.00 0.06 0.00
42.00 1.00 0.06 0.00
43.00 1.00 0.06 0.00
44.00 1.00 0.06 0.00
45.00 1.00 0.06 0.00
46.00 1.00 0.06 0.00
47.00 1.00 0.06 0.00
48.00 1.00 0.06 0.00
49.00 1.00 0.06 0.00
50.00 1.00 0.06 0.00
51.00 1.00 0.06 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 1.00 0.06 0.00
53.00 1.00 0.06 0.00
54.00 1.00 0.06 0.00
55.00 1.00 0.06 0.00
56.00 1.00 0.06 0.00
57.00 1.00 0.06 0.00
58.00 1.00 0.06 0.00
59.00 1.00 0.06 0.00
60.00 1.00 0.06 0.00
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 140HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment E3: East Onsite Bypass
Runoff = 0.01 cfs @ 5.90 hrs, Volume= 55 cf, Depth= 0.00"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"
Area (ac) CN Description
3.290 70 Woods, Good, HSG C
3.290 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
7.5 Direct Entry, Direct Discharge
Subcatchment E3: East Onsite Bypass
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)0.009
0.009
0.008
0.007
0.007
0.006
0.006
0.005
0.005
0.004
0.004
0.003
0.003
0.002
0.002
0.001
0.001
0.000
0
Charlotte 6-hr 2-yr
WQ Rainfall=1.00"
Runoff Area=3.290 ac
Runoff Volume=55 cf
Runoff Depth=0.00"
Tc=7.5 min
CN=70
0.01 cfs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 141HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment E3: East Onsite Bypass
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.04 0.00 0.00
2.00 0.11 0.00 0.00
3.00 0.39 0.00 0.00
4.00 0.88 0.00 0.00
5.00 0.96 0.00 0.01
6.00 1.00 0.00 0.01
7.00 1.00 0.00 0.00
8.00 1.00 0.00 0.00
9.00 1.00 0.00 0.00
10.00 1.00 0.00 0.00
11.00 1.00 0.00 0.00
12.00 1.00 0.00 0.00
13.00 1.00 0.00 0.00
14.00 1.00 0.00 0.00
15.00 1.00 0.00 0.00
16.00 1.00 0.00 0.00
17.00 1.00 0.00 0.00
18.00 1.00 0.00 0.00
19.00 1.00 0.00 0.00
20.00 1.00 0.00 0.00
21.00 1.00 0.00 0.00
22.00 1.00 0.00 0.00
23.00 1.00 0.00 0.00
24.00 1.00 0.00 0.00
25.00 1.00 0.00 0.00
26.00 1.00 0.00 0.00
27.00 1.00 0.00 0.00
28.00 1.00 0.00 0.00
29.00 1.00 0.00 0.00
30.00 1.00 0.00 0.00
31.00 1.00 0.00 0.00
32.00 1.00 0.00 0.00
33.00 1.00 0.00 0.00
34.00 1.00 0.00 0.00
35.00 1.00 0.00 0.00
36.00 1.00 0.00 0.00
37.00 1.00 0.00 0.00
38.00 1.00 0.00 0.00
39.00 1.00 0.00 0.00
40.00 1.00 0.00 0.00
41.00 1.00 0.00 0.00
42.00 1.00 0.00 0.00
43.00 1.00 0.00 0.00
44.00 1.00 0.00 0.00
45.00 1.00 0.00 0.00
46.00 1.00 0.00 0.00
47.00 1.00 0.00 0.00
48.00 1.00 0.00 0.00
49.00 1.00 0.00 0.00
50.00 1.00 0.00 0.00
51.00 1.00 0.00 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 1.00 0.00 0.00
53.00 1.00 0.00 0.00
54.00 1.00 0.00 0.00
55.00 1.00 0.00 0.00
56.00 1.00 0.00 0.00
57.00 1.00 0.00 0.00
58.00 1.00 0.00 0.00
59.00 1.00 0.00 0.00
60.00 1.00 0.00 0.00
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 142HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W1: Pre. West WS
Runoff = 0.02 cfs @ 5.98 hrs, Volume= 140 cf, Depth= 0.00"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"
Area (ac) CN Description
8.390 70 Woods, Good, HSG C
8.390 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
11.6 50 0.0243 0.07 Sheet Flow, West-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
2.1 328 0.0270 2.65 Shallow Concentrated Flow, West Shallow1
Unpaved Kv= 16.1 fps
2.8 540 0.0396 3.20 Shallow Concentrated Flow, W-Shallow2
Unpaved Kv= 16.1 fps
16.5 918 Total
Subcatchment W1: Pre. West WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)0.023
0.022
0.021
0.02
0.019
0.018
0.017
0.016
0.015
0.014
0.013
0.012
0.011
0.01
0.009
0.008
0.007
0.006
0.005
0.004
0.003
0.002
0.001
0
Charlotte 6-hr 2-yr
WQ Rainfall=1.00"
Runoff Area=8.390 ac
Runoff Volume=140 cf
Runoff Depth=0.00"
Flow Length=918'
Tc=16.5 min
CN=70
0.02 cfs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 143HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W1: Pre. West WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.04 0.00 0.00
2.00 0.11 0.00 0.00
3.00 0.39 0.00 0.00
4.00 0.88 0.00 0.00
5.00 0.96 0.00 0.02
6.00 1.00 0.00 0.02
7.00 1.00 0.00 0.00
8.00 1.00 0.00 0.00
9.00 1.00 0.00 0.00
10.00 1.00 0.00 0.00
11.00 1.00 0.00 0.00
12.00 1.00 0.00 0.00
13.00 1.00 0.00 0.00
14.00 1.00 0.00 0.00
15.00 1.00 0.00 0.00
16.00 1.00 0.00 0.00
17.00 1.00 0.00 0.00
18.00 1.00 0.00 0.00
19.00 1.00 0.00 0.00
20.00 1.00 0.00 0.00
21.00 1.00 0.00 0.00
22.00 1.00 0.00 0.00
23.00 1.00 0.00 0.00
24.00 1.00 0.00 0.00
25.00 1.00 0.00 0.00
26.00 1.00 0.00 0.00
27.00 1.00 0.00 0.00
28.00 1.00 0.00 0.00
29.00 1.00 0.00 0.00
30.00 1.00 0.00 0.00
31.00 1.00 0.00 0.00
32.00 1.00 0.00 0.00
33.00 1.00 0.00 0.00
34.00 1.00 0.00 0.00
35.00 1.00 0.00 0.00
36.00 1.00 0.00 0.00
37.00 1.00 0.00 0.00
38.00 1.00 0.00 0.00
39.00 1.00 0.00 0.00
40.00 1.00 0.00 0.00
41.00 1.00 0.00 0.00
42.00 1.00 0.00 0.00
43.00 1.00 0.00 0.00
44.00 1.00 0.00 0.00
45.00 1.00 0.00 0.00
46.00 1.00 0.00 0.00
47.00 1.00 0.00 0.00
48.00 1.00 0.00 0.00
49.00 1.00 0.00 0.00
50.00 1.00 0.00 0.00
51.00 1.00 0.00 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 1.00 0.00 0.00
53.00 1.00 0.00 0.00
54.00 1.00 0.00 0.00
55.00 1.00 0.00 0.00
56.00 1.00 0.00 0.00
57.00 1.00 0.00 0.00
58.00 1.00 0.00 0.00
59.00 1.00 0.00 0.00
60.00 1.00 0.00 0.00
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 144HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W1-A: Pre. West WS
Runoff = 0.01 cfs @ 5.98 hrs, Volume= 70 cf, Depth= 0.00"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"
Area (ac) CN Description
4.190 70 Woods, Good, HSG C
4.190 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
11.6 50 0.0243 0.07 Sheet Flow, West-Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
2.1 328 0.0270 2.65 Shallow Concentrated Flow, West Shallow1
Unpaved Kv= 16.1 fps
2.8 540 0.0396 3.20 Shallow Concentrated Flow, W-Shallow2
Unpaved Kv= 16.1 fps
16.5 918 Total
Subcatchment W1-A: Pre. West WS
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)0.011
0.011
0.01
0.01
0.009
0.009
0.008
0.008
0.007
0.007
0.006
0.006
0.005
0.005
0.004
0.004
0.003
0.003
0.002
0.002
0.001
0.001
0.000
0
Charlotte 6-hr 2-yr
WQ Rainfall=1.00"
Runoff Area=4.190 ac
Runoff Volume=70 cf
Runoff Depth=0.00"
Flow Length=918'
Tc=16.5 min
CN=70
0.01 cfs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 145HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W1-A: Pre. West WS
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.04 0.00 0.00
2.00 0.11 0.00 0.00
3.00 0.39 0.00 0.00
4.00 0.88 0.00 0.00
5.00 0.96 0.00 0.01
6.00 1.00 0.00 0.01
7.00 1.00 0.00 0.00
8.00 1.00 0.00 0.00
9.00 1.00 0.00 0.00
10.00 1.00 0.00 0.00
11.00 1.00 0.00 0.00
12.00 1.00 0.00 0.00
13.00 1.00 0.00 0.00
14.00 1.00 0.00 0.00
15.00 1.00 0.00 0.00
16.00 1.00 0.00 0.00
17.00 1.00 0.00 0.00
18.00 1.00 0.00 0.00
19.00 1.00 0.00 0.00
20.00 1.00 0.00 0.00
21.00 1.00 0.00 0.00
22.00 1.00 0.00 0.00
23.00 1.00 0.00 0.00
24.00 1.00 0.00 0.00
25.00 1.00 0.00 0.00
26.00 1.00 0.00 0.00
27.00 1.00 0.00 0.00
28.00 1.00 0.00 0.00
29.00 1.00 0.00 0.00
30.00 1.00 0.00 0.00
31.00 1.00 0.00 0.00
32.00 1.00 0.00 0.00
33.00 1.00 0.00 0.00
34.00 1.00 0.00 0.00
35.00 1.00 0.00 0.00
36.00 1.00 0.00 0.00
37.00 1.00 0.00 0.00
38.00 1.00 0.00 0.00
39.00 1.00 0.00 0.00
40.00 1.00 0.00 0.00
41.00 1.00 0.00 0.00
42.00 1.00 0.00 0.00
43.00 1.00 0.00 0.00
44.00 1.00 0.00 0.00
45.00 1.00 0.00 0.00
46.00 1.00 0.00 0.00
47.00 1.00 0.00 0.00
48.00 1.00 0.00 0.00
49.00 1.00 0.00 0.00
50.00 1.00 0.00 0.00
51.00 1.00 0.00 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 1.00 0.00 0.00
53.00 1.00 0.00 0.00
54.00 1.00 0.00 0.00
55.00 1.00 0.00 0.00
56.00 1.00 0.00 0.00
57.00 1.00 0.00 0.00
58.00 1.00 0.00 0.00
59.00 1.00 0.00 0.00
60.00 1.00 0.00 0.00
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 146HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Subcatchment W3: West Onsite Bypass
Runoff = 0.01 cfs @ 6.04 hrs, Volume= 70 cf, Depth= 0.00"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"
Area (ac) CN Description
4.200 70 Woods, Good, HSG C
4.200 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.5 264 0.0550 0.14 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.12"
Subcatchment W3: West Onsite Bypass
Runoff
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)0.011
0.01
0.01
0.009
0.009
0.008
0.008
0.007
0.007
0.006
0.006
0.005
0.005
0.004
0.004
0.003
0.003
0.002
0.002
0.001
0.001
0.000
0
Charlotte 6-hr 2-yr
WQ Rainfall=1.00"
Runoff Area=4.200 ac
Runoff Volume=70 cf
Runoff Depth=0.00"
Flow Length=264'
Slope=0.0550 '/'
Tc=31.5 min
CN=70
0.01 cfs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 147HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Subcatchment W3: West Onsite Bypass
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
0.00 0.00 0.00 0.00
1.00 0.04 0.00 0.00
2.00 0.11 0.00 0.00
3.00 0.39 0.00 0.00
4.00 0.88 0.00 0.00
5.00 0.96 0.00 0.01
6.00 1.00 0.00 0.01
7.00 1.00 0.00 0.00
8.00 1.00 0.00 0.00
9.00 1.00 0.00 0.00
10.00 1.00 0.00 0.00
11.00 1.00 0.00 0.00
12.00 1.00 0.00 0.00
13.00 1.00 0.00 0.00
14.00 1.00 0.00 0.00
15.00 1.00 0.00 0.00
16.00 1.00 0.00 0.00
17.00 1.00 0.00 0.00
18.00 1.00 0.00 0.00
19.00 1.00 0.00 0.00
20.00 1.00 0.00 0.00
21.00 1.00 0.00 0.00
22.00 1.00 0.00 0.00
23.00 1.00 0.00 0.00
24.00 1.00 0.00 0.00
25.00 1.00 0.00 0.00
26.00 1.00 0.00 0.00
27.00 1.00 0.00 0.00
28.00 1.00 0.00 0.00
29.00 1.00 0.00 0.00
30.00 1.00 0.00 0.00
31.00 1.00 0.00 0.00
32.00 1.00 0.00 0.00
33.00 1.00 0.00 0.00
34.00 1.00 0.00 0.00
35.00 1.00 0.00 0.00
36.00 1.00 0.00 0.00
37.00 1.00 0.00 0.00
38.00 1.00 0.00 0.00
39.00 1.00 0.00 0.00
40.00 1.00 0.00 0.00
41.00 1.00 0.00 0.00
42.00 1.00 0.00 0.00
43.00 1.00 0.00 0.00
44.00 1.00 0.00 0.00
45.00 1.00 0.00 0.00
46.00 1.00 0.00 0.00
47.00 1.00 0.00 0.00
48.00 1.00 0.00 0.00
49.00 1.00 0.00 0.00
50.00 1.00 0.00 0.00
51.00 1.00 0.00 0.00
Time
(hours)
Precip.
(inches)
Excess
(inches)
Runoff
(cfs)
52.00 1.00 0.00 0.00
53.00 1.00 0.00 0.00
54.00 1.00 0.00 0.00
55.00 1.00 0.00 0.00
56.00 1.00 0.00 0.00
57.00 1.00 0.00 0.00
58.00 1.00 0.00 0.00
59.00 1.00 0.00 0.00
60.00 1.00 0.00 0.00
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 148HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Pond 1P: West Basin
Inflow Area = 182,604 sf, 49.90% Impervious, Inflow Depth = 0.20" for WQ event
Inflow = 1.51 cfs @ 3.22 hrs, Volume= 3,006 cf
Outflow = 0.01 cfs @ 6.17 hrs, Volume= 2,172 cf, Atten= 99%, Lag= 177.1 min
Primary = 0.01 cfs @ 6.17 hrs, Volume= 2,172 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Peak Elev= 637.83' @ 6.17 hrs Surf.Area= 9,874 sf Storage= 2,870 cf
Plug-Flow detention time= 1,495.4 min calculated for 2,172 cf (72% of inflow)
Center-of-Mass det. time= 1,469.6 min ( 1,701.3 - 231.7 )
Volume Invert Avail.Storage Storage Description
#1 637.50' 67,620 cf Custom Stage Data (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
637.50 7,400 0 0
638.00 11,122 4,631 4,631
639.00 12,383 11,753 16,383
640.00 16,772 14,578 30,961
641.00 18,330 17,551 48,512
642.00 19,887 19,109 67,620
Device Routing Invert Outlet Devices
#1 Primary 636.70'24.0" Round Culvert
L= 40.9' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 636.70' / 636.50' S= 0.0049 '/' Cc= 0.900
n= 0.013, Flow Area= 3.14 sf
#2 Device 1 637.50'1.0" Vert. Orifice/Grate C= 0.600
#3 Device 1 638.55'24.0" W x 9.0" H Vert. Orifice/Grate C= 0.600
#4 Secondary 641.50'10.0' 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
Primary OutFlow Max=0.01 cfs @ 6.17 hrs HW=637.83' (Free Discharge)
1=Culvert (Passes 0.01 cfs of 4.90 cfs potential flow)
2=Orifice/Grate (Orifice Controls 0.01 cfs @ 2.60 fps)
3=Orifice/Grate ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=637.50' (Free Discharge)
4=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 149HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Pond 1P: West Basin
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)1
0
Inflow Area=182,604 sf
Peak Elev=637.83'
Storage=2,870 cf
1.51 cfs
0.01 cfs
0.01 cfs
0.00 cfs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 150HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Pond 1P: West Basin
Time
(hours)
Inflow
(cfs)
Storage
(cubic-feet)
Elevation
(feet)
Outflow
(cfs)
Primary
(cfs)
Secondary
(cfs)
0.00 0.00 0 637.50 0.00 0.00 0.00
2.50 0.00 0 637.50 0.00 0.00 0.00
5.00 0.11 2,554 637.80 0.01 0.01 0.00
7.50 0.00 2,806 637.83 0.01 0.01 0.00
10.00 0.00 2,682 637.81 0.01 0.01 0.00
12.50 0.00 2,560 637.80 0.01 0.01 0.00
15.00 0.00 2,442 637.79 0.01 0.01 0.00
17.50 0.00 2,326 637.78 0.01 0.01 0.00
20.00 0.00 2,213 637.76 0.01 0.01 0.00
22.50 0.00 2,103 637.75 0.01 0.01 0.00
25.00 0.00 1,996 637.74 0.01 0.01 0.00
27.50 0.00 1,893 637.73 0.01 0.01 0.00
30.00 0.00 1,792 637.72 0.01 0.01 0.00
32.50 0.00 1,694 637.71 0.01 0.01 0.00
35.00 0.00 1,600 637.70 0.01 0.01 0.00
37.50 0.00 1,509 637.69 0.01 0.01 0.00
40.00 0.00 1,421 637.68 0.01 0.01 0.00
42.50 0.00 1,336 637.67 0.01 0.01 0.00
45.00 0.00 1,254 637.66 0.01 0.01 0.00
47.50 0.00 1,176 637.65 0.01 0.01 0.00
50.00 0.00 1,101 637.64 0.01 0.01 0.00
52.50 0.00 1,029 637.63 0.01 0.01 0.00
55.00 0.00 961 637.62 0.01 0.01 0.00
57.50 0.00 896 637.61 0.01 0.01 0.00
60.00 0.00 835 637.61 0.01 0.01 0.00
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 151HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Pond 5P: Prop Retention Pond East
Inflow Area = 821,106 sf, 44.60% Impervious, Inflow Depth = 0.06" for WQ event
Inflow = 0.64 cfs @ 3.89 hrs, Volume= 3,993 cf
Outflow = 0.03 cfs @ 6.83 hrs, Volume= 3,007 cf, Atten= 95%, Lag= 176.8 min
Primary = 0.03 cfs @ 6.83 hrs, Volume= 3,007 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Tertiary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Peak Elev= 634.69' @ 6.83 hrs Surf.Area= 20,775 sf Storage= 3,707 cf
Plug-Flow detention time= 1,127.0 min calculated for 3,007 cf (75% of inflow)
Center-of-Mass det. time= 1,102.2 min ( 1,384.2 - 282.0 )
Volume Invert Avail.Storage Storage Description
#1 634.50' 161,487 cf East Wet Ponds (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
634.50 19,267 0 0
635.00 23,340 10,652 10,652
636.00 25,936 24,638 35,290
637.00 28,646 27,291 62,581
638.00 31,469 30,058 92,638
639.00 34,391 32,930 125,568
640.00 37,447 35,919 161,487
Device Routing Invert Outlet Devices
#1 Primary 634.50'2.0" Vert. Orifice/Grate C= 0.600
#2 Secondary 637.68'24.0" W x 9.0" H Vert. Orifice/Grate X 4.00 C= 0.600
#3 Tertiary 639.50'10.0' 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
Primary OutFlow Max=0.03 cfs @ 6.83 hrs HW=634.69' (Free Discharge)
1=Orifice/Grate (Orifice Controls 0.03 cfs @ 1.54 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=634.50' (Free Discharge)
2=Orifice/Grate ( Controls 0.00 cfs)
Tertiary OutFlow Max=0.00 cfs @ 0.00 hrs HW=634.50' (Free Discharge)
3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 152HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Pond 5P: Prop Retention Pond East
Inflow
Outflow
Primary
Secondary
Tertiary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)0.7
0.65
0.6
0.55
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
Inflow Area=821,106 sf
Peak Elev=634.69'
Storage=3,707 cf
0.64 cfs
0.03 cfs
0.03 cfs
0.00 cfs
0.00 cfs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 153HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Pond 5P: Prop Retention Pond East
Time
(hours)
Inflow
(cfs)
Storage
(cubic-feet)
Elevation
(feet)
Outflow
(cfs)
Primary
(cfs)
Secondary
(cfs)
Tertiary
(cfs)
0.00 0.00 0 634.50 0.00 0.00 0.00 0.00
2.50 0.00 0 634.50 0.00 0.00 0.00 0.00
5.00 0.32 2,604 634.63 0.02 0.02 0.00 0.00
7.50 0.00 3,659 634.68 0.03 0.03 0.00 0.00
10.00 0.00 3,374 634.67 0.03 0.03 0.00 0.00
12.50 0.00 3,109 634.66 0.03 0.03 0.00 0.00
15.00 0.00 2,869 634.64 0.03 0.03 0.00 0.00
17.50 0.00 2,653 634.63 0.02 0.02 0.00 0.00
20.00 0.00 2,458 634.62 0.02 0.02 0.00 0.00
22.50 0.00 2,282 634.62 0.02 0.02 0.00 0.00
25.00 0.00 2,123 634.61 0.02 0.02 0.00 0.00
27.50 0.00 1,980 634.60 0.02 0.02 0.00 0.00
30.00 0.00 1,850 634.59 0.01 0.01 0.00 0.00
32.50 0.00 1,733 634.59 0.01 0.01 0.00 0.00
35.00 0.00 1,627 634.58 0.01 0.01 0.00 0.00
37.50 0.00 1,531 634.58 0.01 0.01 0.00 0.00
40.00 0.00 1,444 634.57 0.01 0.01 0.00 0.00
42.50 0.00 1,366 634.57 0.01 0.01 0.00 0.00
45.00 0.00 1,295 634.57 0.01 0.01 0.00 0.00
47.50 0.00 1,230 634.56 0.01 0.01 0.00 0.00
50.00 0.00 1,172 634.56 0.01 0.01 0.00 0.00
52.50 0.00 1,120 634.56 0.01 0.01 0.00 0.00
55.00 0.00 1,072 634.56 0.01 0.01 0.00 0.00
57.50 0.00 1,028 634.55 0.00 0.00 0.00 0.00
60.00 0.00 986 634.55 0.00 0.00 0.00 0.00
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 154HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Link 1L: (new Link)
Inflow Area = 365,556 sf, 24.93% Impervious, Inflow Depth > 0.07" for WQ event
Inflow = 0.02 cfs @ 6.06 hrs, Volume= 2,242 cf
Primary = 0.02 cfs @ 6.06 hrs, Volume= 2,242 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Link 1L: (new Link)
Inflow
Primary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)0.026
0.024
0.022
0.02
0.018
0.016
0.014
0.012
0.01
0.008
0.006
0.004
0.002
0
Inflow Area=365,556 sf
0.02 cfs
0.02 cfs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 155HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Link 1L: (new Link)
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
0.00 0.00 0.00 0.00
1.00 0.00 0.00 0.00
2.00 0.00 0.00 0.00
3.00 0.00 0.00 0.00
4.00 0.01 0.00 0.01
5.00 0.02 0.00 0.02
6.00 0.02 0.00 0.02
7.00 0.01 0.00 0.01
8.00 0.01 0.00 0.01
9.00 0.01 0.00 0.01
10.00 0.01 0.00 0.01
11.00 0.01 0.00 0.01
12.00 0.01 0.00 0.01
13.00 0.01 0.00 0.01
14.00 0.01 0.00 0.01
15.00 0.01 0.00 0.01
16.00 0.01 0.00 0.01
17.00 0.01 0.00 0.01
18.00 0.01 0.00 0.01
19.00 0.01 0.00 0.01
20.00 0.01 0.00 0.01
21.00 0.01 0.00 0.01
22.00 0.01 0.00 0.01
23.00 0.01 0.00 0.01
24.00 0.01 0.00 0.01
25.00 0.01 0.00 0.01
26.00 0.01 0.00 0.01
27.00 0.01 0.00 0.01
28.00 0.01 0.00 0.01
29.00 0.01 0.00 0.01
30.00 0.01 0.00 0.01
31.00 0.01 0.00 0.01
32.00 0.01 0.00 0.01
33.00 0.01 0.00 0.01
34.00 0.01 0.00 0.01
35.00 0.01 0.00 0.01
36.00 0.01 0.00 0.01
37.00 0.01 0.00 0.01
38.00 0.01 0.00 0.01
39.00 0.01 0.00 0.01
40.00 0.01 0.00 0.01
41.00 0.01 0.00 0.01
42.00 0.01 0.00 0.01
43.00 0.01 0.00 0.01
44.00 0.01 0.00 0.01
45.00 0.01 0.00 0.01
46.00 0.01 0.00 0.01
47.00 0.01 0.00 0.01
48.00 0.01 0.00 0.01
49.00 0.01 0.00 0.01
50.00 0.01 0.00 0.01
51.00 0.01 0.00 0.01
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
52.00 0.01 0.00 0.01
53.00 0.01 0.00 0.01
54.00 0.01 0.00 0.01
55.00 0.01 0.00 0.01
56.00 0.01 0.00 0.01
57.00 0.01 0.00 0.01
58.00 0.01 0.00 0.01
59.00 0.01 0.00 0.01
60.00 0.01 0.00 0.01
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 156HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Summary for Link 6L: East Post Comb
Inflow Area = 964,418 sf, 37.97% Impervious, Inflow Depth > 0.04" for WQ event
Inflow = 0.04 cfs @ 5.97 hrs, Volume= 3,062 cf
Primary = 0.04 cfs @ 5.97 hrs, Volume= 3,062 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.05 hrs
Link 6L: East Post Comb
Inflow
Primary
Hydrograph
Time (hours)
605856545250484644424038363432302826242220181614121086420Flow (cfs)0.042
0.04
0.038
0.036
0.034
0.032
0.03
0.028
0.026
0.024
0.022
0.02
0.018
0.016
0.014
0.012
0.01
0.008
0.006
0.004
0.002
0
Inflow Area=964,418 sf
0.04 cfs
0.04 cfs
Charlotte 6-hr 2-yr WQ Rainfall=1.00"20131483-RG1-Det-comb 2-20-18
Printed 2/22/2018Prepared by Symanetc
Page 157HydroCAD® 10.00-15 s/n 07459 © 2015 HydroCAD Software Solutions LLC
Hydrograph for Link 6L: East Post Comb
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
0.00 0.00 0.00 0.00
1.00 0.00 0.00 0.00
2.00 0.00 0.00 0.00
3.00 0.00 0.00 0.00
4.00 0.01 0.00 0.01
5.00 0.03 0.00 0.03
6.00 0.04 0.00 0.04
7.00 0.03 0.00 0.03
8.00 0.03 0.00 0.03
9.00 0.03 0.00 0.03
10.00 0.03 0.00 0.03
11.00 0.03 0.00 0.03
12.00 0.03 0.00 0.03
13.00 0.03 0.00 0.03
14.00 0.03 0.00 0.03
15.00 0.03 0.00 0.03
16.00 0.02 0.00 0.02
17.00 0.02 0.00 0.02
18.00 0.02 0.00 0.02
19.00 0.02 0.00 0.02
20.00 0.02 0.00 0.02
21.00 0.02 0.00 0.02
22.00 0.02 0.00 0.02
23.00 0.02 0.00 0.02
24.00 0.02 0.00 0.02
25.00 0.02 0.00 0.02
26.00 0.02 0.00 0.02
27.00 0.02 0.00 0.02
28.00 0.01 0.00 0.01
29.00 0.01 0.00 0.01
30.00 0.01 0.00 0.01
31.00 0.01 0.00 0.01
32.00 0.01 0.00 0.01
33.00 0.01 0.00 0.01
34.00 0.01 0.00 0.01
35.00 0.01 0.00 0.01
36.00 0.01 0.00 0.01
37.00 0.01 0.00 0.01
38.00 0.01 0.00 0.01
39.00 0.01 0.00 0.01
40.00 0.01 0.00 0.01
41.00 0.01 0.00 0.01
42.00 0.01 0.00 0.01
43.00 0.01 0.00 0.01
44.00 0.01 0.00 0.01
45.00 0.01 0.00 0.01
46.00 0.01 0.00 0.01
47.00 0.01 0.00 0.01
48.00 0.01 0.00 0.01
49.00 0.01 0.00 0.01
50.00 0.01 0.00 0.01
51.00 0.01 0.00 0.01
Time
(hours)
Inflow
(cfs)
Elevation
(feet)
Primary
(cfs)
52.00 0.01 0.00 0.01
53.00 0.01 0.00 0.01
54.00 0.01 0.00 0.01
55.00 0.01 0.00 0.01
56.00 0.00 0.00 0.00
57.00 0.00 0.00 0.00
58.00 0.00 0.00 0.00
59.00 0.00 0.00 0.00
60.00 0.00 0.00 0.00

APPENDIX C:
Site Aerial Map

GoMAPS - Union County NC Public Access
Monday,
February 10
2014
This map is prepared for the inventory of real property found within Union County, NC and is compiled from recorded deeds, plats, and other public records and data. Users of
this map are hereby notified that the aforementioned public primary information sources should be consulted for verification of the information contained on this map. Union
County and the mapping companies assume no legal responsibilities for the information contained on this map.
Grid based on the North Carolina State Plane Coordinate System
All dimensions in feet

APPENDIX D:
Soils Map

Soil Map—Union County, North Carolina
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/17/2014
Page 1 of 338882003888300388840038885003888600388870038888003888900388900038891003888200388830038884003888500388860038887003888800388890038890003889100534300534400534500534600534700534800534900535000
534300 534400 534500 534600 534700 534800 534900 535000
35° 8' 40'' N 80° 37' 28'' W35° 8' 40'' N80° 36' 56'' W35° 8' 6'' N
80° 37' 28'' W35° 8' 6'' N
80° 36' 56'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 17N WGS84
0 200 400 800 1200
Feet
0 50 100 200 300
Meters
Map Scale: 1:5,110 if printed on A portrait (8.5" x 11") sheet.
Map Unit Legend
Union County, North Carolina (NC179)
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
BaB Badin channery silt loam, 2 to 8
percent slopes
16.1 30.6%
CmB Cid channery silt loam, 1 to 5
percent slopes
1.5 2.9%
ScA Secrest-Cid complex, 0 to 3
percent slopes
29.5 56.3%
TaB Tarrus gravelly silt loam, 2 to 8
percent slopes
5.4 10.2%
Totals for Area of Interest 52.5 100.0%
Soil Map—Union County, North Carolina
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/17/2014
Page 3 of 3
Hydrologic Soil Group
Hydrologic Soil Group— Summary by Map Unit — Union County, North Carolina (NC179)
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
BaB Badin channery silt loam,
2 to 8 percent slopes
B 16.1 30.6%
CmB Cid channery silt loam, 1
to 5 percent slopes
D 1.5 2.9%
ScA Secrest-Cid complex, 0
to 3 percent slopes
C 29.5 56.3%
TaB Tarrus gravelly silt loam,
2 to 8 percent slopes
B 5.4 10.2%
Totals for Area of Interest 52.5 100.0%
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive precipitation
from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly
wet. These consist mainly of deep, well drained to excessively drained sands or
gravelly sands. These soils have a high rate of water transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well drained
soils that have moderately fine texture to moderately coarse texture. These soils
have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of water
transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay layer
at or near the surface, and soils that are shallow over nearly impervious material.
These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in their
natural condition are in group D are assigned to dual classes.
Hydrologic Soil Group—Union County, North Carolina
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/17/2014
Page 3 of 4

APPENDIX E:
NCDENR Supplemental BMP Calculations

Permit No.______________________
(to be provided by DWQ)
I. PROJECT INFORMATION
Project name
Contact person
Phone number
Date
Drainage area number
II. DESIGN INFORMATION
Site Characteristics
Drainage area 821,106 ft2
Impervious area, post-development 374,014 ft2
% impervious 45.55 %
Design rainfall depth 1.0 in
Storage Volume: Non-SA Waters
Minimum volume required 31,472 ft3
OK, volume provided is equal to or in excess of volume required.
Storage Volume: SA Waters
1.5" runoff volume ft3
Pre-development 1-yr, 24-hr runoff ft3
Post-development 1-yr, 24-hr runoff ft3
Minimum volume required ft3
Peak Flow Calculations
Is the pre/post control of the 1yr 24hr storm peak flow required?y (Y or N)
1-yr, 24-hr rainfall depth 2.6 in
Rational C, pre-development 70.00 (unitless)
Rational C, post-development 78.00 (unitless)
Rainfall intensity: 1-yr, 24-hr storm 2.58 in/hr OK
Pre-development 1-yr, 24-hr peak flow 3.90 ft3/sec
Post-development 1-yr, 24-hr peak flow 10.65 ft3/sec
Pre/Post 1-yr, 24-hr peak flow control 6.75 ft3/sec
Elevations
Temporary pool elevation 635.86 fmsl
Permanent pool elevation 634.50 fmsl
SHWT elevation (approx. at the perm. pool elevation)fmsl
Top of 10ft vegetated shelf elevation 635.00 fmsl
Bottom of 10ft vegetated shelf elevation 634.00 fmsl
Sediment cleanout, top elevation (bottom of pond)627.00 fmsl
Sediment cleanout, bottom elevation 626.00 fmsl
Sediment storage provided 1.00 ft
Is there additional volume stored above the state-required temp. pool?y (Y or N)
Elevation of the top of the additional volume 635.9 fmsl OK
Surface Areas
Area, temporary pool 25,573 ft2
Area REQUIRED, permanent pool 15,519 ft2
SA/DA ratio 1.89 (unitless)
Area PROVIDED, permanent pool, Aperm_pool 19,267 ft2 OK
Area, bottom of 10ft vegetated shelf, Abot_shelf 15,541 ft2
Area, sediment cleanout, top elevation (bottom of pond), Abot_pond 3,278 ft2
Volumes
Volume, temporary pool 31,684 ft3 OK
Volume, permanent pool, Vperm_pool 75,868 ft3
Volume, forebay (sum of forebays if more than one forebay)15,200 ft3
Forebay % of permanent pool volume 20.0%%OK
SA/DA Table Data
Design TSS removal 85 %
Coastal SA/DA Table Used?n (Y or N)
Mountain/Piedmont SA/DA Table Used?y (Y or N)
SA/DA ratio 1.89 (unitless)
Average depth (used in SA/DA table):
Calculation option 1 used? (See Figure 10-2b)n (Y or N)
Volume, permanent pool, Vperm_pool 75,868 ft3
Area provided, permanent pool, Aperm_pool 19,267 ft2
Average depth calculated 6.50 ft OK
Average depth used in SA/DA, dav, (Round to nearest 0.5ft)6.5 ft OK
Calculation option 2 used? (See Figure 10-2b)y (Y or N)
Area provided, permanent pool, Aperm_pool 19,267 ft2
Area, bottom of 10ft vegetated shelf, Abot_shelf 15,541 ft2
Area, sediment cleanout, top elevation (bottom of pond),
Abot_pond
3,278 ft2
"Depth" (distance b/w bottom of 10ft shelf and top of sediment)7.00 ft
Average depth calculated 5.50 ft OK
Average depth used in SA/DA, dav, (Round to down to nearest 0.5ft)5.5 ft OK
Drawdown Calculations
Drawdown through orifice?y (Y or N)
Diameter of orifice (if circular)2.00 in
Area of orifice (if-non-circular)in2
Coefficient of discharge (CD)0.60 (unitless)
Driving head (Ho)1.36 ft
Drawdown through weir?n (Y or N)
Weir type (unitless)
Coefficient of discharge (Cw)(unitless)
Length of weir (L)ft
Driving head (H)ft
Pre-development 1-yr, 24-hr peak flow 3.90 ft3/sec
Post-development 1-yr, 24-hr peak flow 10.65 ft3/sec
Storage volume discharge rate (through discharge orifice or weir)0.12 ft3/sec
OK, draws down in 2-5 days.
Additional Information
Vegetated side slopes 3 :1 OK
Vegetated shelf slope 10 :1 OK
Vegetated shelf width 10.0 ft OK
Length of flowpath to width ratio 3 :1 OK
Length to width ratio 2.0 :1 OK
Trash rack for overflow & orifice?y (Y or N)OK
Freeboard provided 1.0 ft OK
Vegetated filter provided?n (Y or N)Insufficient. Vegetated filter required.
Recorded drainage easement provided?y (Y or N)OK
Capures all runoff at ultimate build-out?y (Y or N)OK
Drain mechanism for maintenance or emergencies is:
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
Doug Turney
401 CERTIFICATION APPLICATION FORM
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information.
East Basins 1 & 2
Storage volume drawdown time 2.96 days
Courtyards at Emerald Lake
Volume provided 31,684
pump out
614-775-4213
26-Sep-14
This form must be filled out, printed and submitted.
WET DETENTION BASIN SUPPLEMENT
Volume provided
ft3
ft3
Form SW401-Wet Detention Basin-Rev.9-4/18/12 Parts I. & II. Design Summary, Page 1 of 1
Permit No.______________________
(to be provided by DWQ)
I. PROJECT INFORMATION
Project name
Contact person
Phone number
Date
Drainage area number
II. DESIGN INFORMATION
Site Characteristics
Drainage area 182,516 ft2
Impervious area, post-development 91,076 ft2
% impervious 49.90 %
Design rainfall depth 1.0 in
Storage Volume: Non-SA Waters
Minimum volume required 7,595 ft3
OK, volume provided is equal to or in excess of volume required.
Storage Volume: SA Waters
1.5" runoff volume ft3
Pre-development 1-yr, 24-hr runoff ft3
Post-development 1-yr, 24-hr runoff ft3
Minimum volume required ft3
Peak Flow Calculations
Is the pre/post control of the 1yr 24hr storm peak flow required? y (Y or N)
1-yr, 24-hr rainfall depth 2.6 in
Rational C, pre-development 70.00 (unitless)
Rational C, post-development 78.00 (unitless)
Rainfall intensity: 1-yr, 24-hr storm 2.58 in/hr OK
Pre-development 1-yr, 24-hr peak flow 4.16 ft3/sec
Post-development 1-yr, 24-hr peak flow 9.13 ft3/sec
Pre/Post 1-yr, 24-hr peak flow control 4.97 ft3/sec
Elevations
Temporary pool elevation 638.68 fmsl
Permanent pool elevation 637.50 fmsl
SHWT elevation (approx. at the perm. pool elevation) fmsl
Top of 10ft vegetated shelf elevation 637.00 fmsl
Bottom of 10ft vegetated shelf elevation 636.00 fmsl
Sediment cleanout, top elevation (bottom of pond) 633.00 fmsl
Sediment cleanout, bottom elevation 632.00 fmsl
Sediment storage provided 1.00 ft
Is there additional volume stored above the state-required temp. pool? y (Y or N)
Elevation of the top of the additional volume 638.7 fmsl OK
Surface Areas
Area, temporary pool 11,979 ft2
Area REQUIRED, permanent pool 2,957 ft2
SA/DA ratio 1.62 (unitless)
Area PROVIDED, permanent pool, Aperm_pool 7,400 ft2 OK
Area, bottom of 10ft vegetated shelf, Abot_shelf 6,516 ft2
Area, sediment cleanout, top elevation (bottom of pond), Abot_pond 3,647 ft2
Volumes
Volume, temporary pool 7,679 ft3 OK
Volume, permanent pool, Vperm_pool 27,042 ft3
Volume, forebay (sum of forebays if more than one forebay) 5,408 ft3
Forebay % of permanent pool volume 20.0% % OK
SA/DA Table Data
Design TSS removal 85 %
Coastal SA/DA Table Used?n (Y or N)
Mountain/Piedmont SA/DA Table Used?y (Y or N)
SA/DA ratio 1.62 (unitless)
Average depth (used in SA/DA table):
Calculation option 1 used? (See Figure 10-2b)n (Y or N)
Volume, permanent pool, Vperm_pool 27,042 ft3
Area provided, permanent pool, Aperm_pool 7,400 ft2
Average depth calculated 3.65 ft OK
Average depth used in SA/DA, dav, (Round to nearest 0.5ft)3.5 ft OK
Calculation option 2 used? (See Figure 10-2b)y (Y or N)
Area provided, permanent pool, Aperm_pool 7,400 ft2
Area, bottom of 10ft vegetated shelf, Abot_shelf 6,516 ft2
Area, sediment cleanout, top elevation (bottom of pond),
Abot_pond
3,647 ft2
"Depth" (distance b/w bottom of 10ft shelf and top of sediment)3.00 ft
Average depth calculated 3.98 ft OK
Average depth used in SA/DA, dav, (Round to down to nearest 0.5ft)4.0 ft OK
Drawdown Calculations
Drawdown through orifice?y (Y or N)
Diameter of orifice (if circular)1.00 in
Area of orifice (if-non-circular)in2
Coefficient of discharge (CD)0.60 (unitless)
Driving head (Ho)0.77 ft
Drawdown through weir?n (Y or N)
Weir type (unitless)
Coefficient of discharge (Cw) (unitless)
Length of weir (L)ft
Driving head (H)ft
Pre-development 1-yr, 24-hr peak flow 4.16 ft3/sec
Post-development 1-yr, 24-hr peak flow 9.13 ft3/sec
Storage volume discharge rate (through discharge orifice or weir)0.02 ft3/sec
OK, draws down in 2-5 days.
Additional Information
Vegetated side slopes 3 :1 OK
Vegetated shelf slope 10 :1 OK
Vegetated shelf width 10.0 ft OK
Length of flowpath to width ratio 3 :1 OK
Length to width ratio 2.0 :1 OK
Trash rack for overflow & orifice?y (Y or N)OK
Freeboard provided 1.0 ft OK
Vegetated filter provided?n (Y or N)Insufficient. Vegetated filter required.
Recorded drainage easement provided?y (Y or N)OK
Capures all runoff at ultimate build-out?y (Y or N)OK
Drain mechanism for maintenance or emergencies is:
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
Doug Turney
401 CERTIFICATION APPLICATION FORM
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information.
West Basin 3
Storage volume drawdown time 4.44 days
Courtyards at Emerald Lake
Volume provided 7,679
pump out
614-775-4213
21-Feb-18
This form must be filled out, printed and submitted.
WET DETENTION BASIN SUPPLEMENT
Volume provided
ft3
ft3
Form SW401-Wet Detention Basin-Rev.9-4/18/12 Parts I. & II. Design Summary, Page 1 of 1