20211015_ADI_Response

c2S
ENGINEERING & ENVIRONMENTAL SCIENCE COMPANY
3008 ANDERSON DRIVE, SUITE 102
RALEIGH, NC 27609
[phone]
LETTER OF TRANSMITTAL
Date: September 28, 2021 RECEIVED
To: NCDEQ-DEMLR OCT 1 s n21
1612 Mail Service Center
Raleigh, NC 27699-1612 LAND QUALITY
MINING PROGRAM
From: T. Patrick Shillington, P.E.
Engineering and Environmental Science Company (EZS)
3008 Anderson Dr., Suite 102
Raleigh, NC 27609
Subject: Brickhaven Mine #2 Tract B (Mining Permit# 19-08)
Mining Permit Modification
Chatham County
Submitted are the revised plans and specifications for the above referenced project. The
revisions were made based on the I" review comments sent in a letter dated December
11, 2020, from NCDEQ-DEMLR. The following are responses to the review comments.
1. The detail on the mine maps is difficult to read. Please provide additional maps of the
site at a larger scale so that detail on erosion and sediment control measures is clearly
visible.
An additional mine map with a larger scale has been provided (See Sheet 2).
2. Please show location ofskimmers and skimmer outlets on all basins on the plan.
The locations of all skimmer, skimmer outlets, and secondary spillways are
provided on the plans (See Sheets 1 and 2)
3. Please provide a Jurisdictional Determination with proposed impacts for the stream
features from the US Army Corp of Engineers.
Based on input by the US Army Corp of Engineers, additional field work by
Maycock Environmental was conducted. The submitted mine map reflects the
modifications necessary to avoid and minimize wetlands. Final approval from the
US Army Corp of Engineers has not been received.
M

CIS
ENGINEERING & ENVIRONMENTAL SCIENCE COMPANY
3008 ANDERSON DRIVE, SUITE 102
RALEIGH, NC 27609 _
[phone]
September 28, 2021
Mr. Warren Paschal
General Shale Brick, Inc.
300 Brick Plant Rd.
Moncure, NC 27559 RECEIVED
Re: Erosion Control Evaluation OCT 1 5 2021
Mine Permit Modification
Brickhaven Mine 42 Tract B LAND QUALITY
Permit No.19-08 MINING PROGP.Ah/
Chatham County, NC
Dear Mr. Paschal:
M
2011
ITY
Engineering & Environmental Science Company (E2S) has completed the evaluation of the mine
renewal for the above -referenced mine. Separately submitted are the mine maps and application.
GENERAL PROJECT DISCUSSION
The Brickhaven Mine #2 Tract B (Permit No. 19-08) located in Chatham County, North Carolina,
contains 348 acres of permitted land (See Attachment, Vicinity Map). Currently, the permitted
allowable affected acreage is 94 acres. It is proposed to add an additional 50 acres of affected
acreage, for a total of 144 acres of allowable affected acreage. This additional acreage is located
within the mining permit limits, and no change to the total permitted area is proposed.
Mining will continue as permitted in the existing mine area, to the east of existing Basin K. Erosion
control for the proposed new mining area will consist of five (5) new sediment basins (Basins L, M,
N, O, and P). Earthen berms will be constructed to divert stormwater runoff to these basins. No
mining will occur north of the Progress Energy Easement that runs through the property.
After mining activities are complete, lakes will be formed, with exposed ground above the water
table sloped towards the lakes at a maximum slope of 2:1 (H:V). Some of the haul roads will remain
in -place to include from SR-1924 to the current stockpile areas. The ditches for these roadways (if
present) are presently grassed and stable. The buildings or sheds will be removed. The 5'x'5
concrete riser structure and outlet pipe at existing Basin K will remain in -place.

Attachment A: Figures
Attachment B: Calculations
The two inactive spray irrigation systems' underground piping will remain in place or will be
excavated. The ends of the pipes will be capped if left in place. The nozzles and nozzle stands will
be removed.
EVALUATION
In accordance with the USDA Soil Survey of Chatham County, Peawick (PeA and PeB) is the
predominant soil type at the site (See Figure 2), and is classified as Hydrologic Group D.
The SCS TR-55 Method was used to calculate the 2-year, 10-year, and 25-year rain events. Erosion
control for the proposed mining area will consist of sediment basins with a riser/barrel system with
skimmers attached to the riser pipes. The proposed corrugated metal riser pipes will have skimmers
attached 1 ft. above the base of pipe. The system will drain the basins over a period of approximately
2-3 days.
Perimeter berms will be used to divert the stormwater runoff to the basins. Trash racks will be
provided for the CMP riser pipes. For each basin, a 20' wide secondary spillway is provided. The
secondary spillway is only activated for rain events greater than the 2-year rain event. The basins can
pass the 25-year rain event with one foot of freeboard. See Attachment B for calculations for these
basins.
CLOSURE
We appreciate serving General Shale Brick on this project. Please contact us if you have any
questions.
Sincerely,
J'
T. Patrick Shillington .E.
President
Sit' � � � ��I',•
FF,SS10,
•Q
SEAI. s
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swt
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Attachment A: Figures
62S

I `
cr-
a
�
a
Hydrological
Soil Symbol
Soil Name
Group
WhD
While Store
D
CcB
Carbonton
C
MCC
Mattadoni
C
WhC
White Store
D
PeB
Peawick
D
PeA
Peawick
D
WhB
White Store
D
ChA
Chewacla
C
UdC
Udorthents
B
N
4_
Scale: 1" = 1000'
F 'Pl
!, ■

Attachment B: Calculations

Watershed L
9 Reach Aon Ink
Basin L

Basin L Type 11 24-hr 2 yr Rainfall=3.55"
Prepared by {enter your company name here) Printed 10/15/2021
HydroCAD010.00-20 s/n 07329 02017 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment IS: Watershed L
Runoff = 83.71 cfs @ 12.07 hrs, Volume= 5.769 af, Depth= 2.88"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=3.55"
Area (ac) CN Description
24.000 94 Newly graded area, HSG D
24.000 100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
3.2 100
0.0330
0.53
Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
12.0 1,250
0.0300
1.73
Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Until led Kv= 10.0 fas
15.2 1,350 Total

Basin L Type 1124-hr 2 yr Rainfall=3.55"
Prepared by (enter your company name here) Printed 10/15/2021
HydroCADO 10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 3
Summary for Pond 1 P: Basin L
Inflow Area = 24.000 ac, 0.00% Impervious, Inflow Depth = 2.88" for 2 yr event
Inflow = 83.71 cfs @ 12.07 hrs, Volume= 5.769 of
Outflow = 4.29 cfs @ 13.56 hrs, Volume= 5.769 af, Atten= 95%, Lag= 89.8 min
Primary - 4.29 cfs @ 13.56 hrs, Volume= 5.769 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 224.57' @ 13.56 hrs Surf.Area= 65,765 sf Storage= 159,325 cf
Plug -Flow detention time= 989.2 min calculated for 5.766 of (100% of inflow)
Center -of -Mass det. time= 990.9 min ( 1,779.9 - 789.0)
Volume Invert Avail.Storage Storage Description
#1 222.00' 255,968 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
222.00 57,800 0 0
223.00 60,896 59,348 59,348
224.00 63,992 62,444 121,792
225.00 67,088 65,540 187,332
226.00 70,184 68,636 255,968
Device Routing Invert Outlet Devices
#1 Primary 221.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 221.00' / 220.00' S= 0.0200 '/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 223.00' 18.0" Horiz. 18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 222.00' 0.230 cfs 4" Skimmer
#4 Primary 225.00' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=4.29 cfs @ 13.56 hrs HW=224.57' (Free Discharge)
1=12"' CMP Barrel (Barrel Controls 4.29 cfs @ 5.46 fps)
2=18" CMP Riser (Passes < 10.67 cfs potential flow)
3=4" Skimmer (Passes < 0.23 cfs potential flow)
=20' Secondary Spillway ( Controls 0.00 cfs)

Basin L Type 11 24-hr 10 yr Rainfall=5.17"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD® 10.00-20 s/n 07329 02017 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment IS: Watershed L
Runoff = 126.71 cfs @ 12.06 hrs, Volume= 8.952 af, Depth= 4.48"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr Rainfall=5.17"
Area (ac) CN Description
24.000 94 Newly graded area, HSG D
24.000 100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
3.2 100
0.0330
0.53
Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
12.0 1,250
0.0300
1.73
Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Until led Kv= 10.0 fps
15.2 1,350 Total

Basin L Type 11 24-hr 10 yr Rainfall=5.17"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCADO 10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 5
Summary for Pond 1 P: Basin L
Inflow Area = 24.000 ac, 0.00% Impervious, Inflow Depth = 4.48" for 10 yr event
Inflow = 126.71 cfs @ 12.06 hrs, Volume= 8.952 of
Outflow = 27.57 cfs @ 12.40 hrs, Volume= 8.951 af, Atten= 78%, Lag= 20.4 min
Primary = 27.57 cfs @ 12.40 hrs, Volume= 8.951 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 225.48' @ 12.40 hrs, Surf.Area= 68,564 sf Storage= 220,048 cf
Plug -Flow detention time= 778.9 min calculated for 8.948 of (100% of inflow)
Center -of -Mass det. time= 780.8 min ( 1,558.4 - 777.5 )
Volume Invert Avail.Storage Storage Description
#1 222.00' 255,968 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
222.00 57,800 0 0
223.00 60,896 59,348 59,348
224.00 63,992 62,444 121,792
225.00 67,088 65,540 187,332
226.00 70,184 68,636 255,968
Device Routing Invert Outlet Devices
#1 Primary 221.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 221.00' / 220.00' S= 0.0200 7' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 223.00' 18.0" Horiz. 18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 222.00' 0.230 cfs 4" Skimmer
#4 Primary 225.00' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=27.51 cfs @ 12.40 hrs HW=225.48' (Free Discharge)
t=12" CMP Barrel (Barrel Controls 4.80 cfs @ 6.12 fps)
2=18" CMP Riser (Passes < 13.39 cfs potential flow)
3=4" Skimmer (Passes < 0.23 cfs potential flow)
=20' Secondary Spillway (Weir Controls 22.71 cfs @ 2.09 fps)

13
Basin L Type 11 24-hr 25 yr Rainfall=6.15"
Prepared by {enter your company name here) Printed 10/15/2021
HydroCAD®10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment IS: Watershed L
Runoff = 152.49 cfs @ 12.06 hrs, Volume= 10.890 af, Depth= 5.45"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 25 yr Rainfall=6.15"
Area (ac) CN Description
24.000
94 Newly
graded area, HSG D
24.000
100.00% Pervious Area
Tc Length
Slope
Velocity Capacity
Description
(min) (feet)
(ft/ft)
(ft/sec) (cfs)
3.2 100
0.0330
0.53
Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
12.0 1,250
0.0300
1.73
Shallow Concentrated Flow, Shallow Concent.
Nearlv Bare & Untilled Kv= 10.0 fps
15.2 1,350 Total

Basin L Type II 24-hr 25 yr Rainfall=6.15"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCADO 10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page7
Summary for Pond 1 P: Basin L
Inflow Area = 24.000 ac, 0.00% Impervious, Inflow Depth = 5.45" for 25 yr event
Inflow = 152.49 cfs @ 12.06 hrs, Volume= 10.890 of
Outflow = 57.57 cfs @ 12.28 hrs, Volume= 10.890 af, Atten= 62%, Lag= 13.1 min
Primary = 57.57 cfs @ 12.28 hrs, Volume= 10.890 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 225.81' @ 12.28 hrs SurP.Area= 69,604 sf Storage= 243,102 cf
Plug -Flow detention time= 671.6 min calculated for 10.886 of (100% of inflow)
Center -of -Mass det. time= 673.5 min ( 1,446.3 - 772.8 )
Volume Invert Avail.Storage Storage Description
#1 222.00' 255,968 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
222.00 57,800 0 0
223.00 60,896 59,348 59,348
224.00 63,992 62,444 121,792
225.00 67,088 65,540 187,332
226.00 70,184 68,636 255,968
Device Routing Invert Outlet Devices
#1 Primary 221.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 221.00' / 220.00' S= 0.0200 '/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 223.00' 18.0" Horiz. 18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 222.00' 0.230 cfs 4" Skimmer
#4 Primary 225.00' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=57.17 cfs @ 12.28 hrs HW=225.81' (Free Discharge)
=12" CMP Barrel (Barrel Controls 4.98 cfs @ 6.34 fps)
2=18" CMP Riser (Passes < 14.26 cfs potential flow)
3=4" Skimmer (Passes < 0.23 cfs potential flow)
=20' Secondary Spillway (Weir Controls 52.19 cfs @ 2.60 fps)

Watershed M
Subcat Reach Aon Rk
■u

i
Basin M Type 1124-hr 2 yr Rainfall=3.55"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD® 10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment IS: Watershed M
Runoff = 31.31 cfs @ 12.04 hrs, Volume= 2.000 af, Depth= 2.88"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=3.55"
Area (ac) CN Description
8.320
94 Newly
graded area, HSG D
8.320
100.00% Pervious Area
Tc Length
Slope
Velocity Capacity
Description
(min) (feet)
(ft/ft)
(ft/sec) (cfs)
3.5 100
0.0250
0.47
Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
9.2 675
0.0150
1.22
Shallow Concentrated Flow, Shallow Concent.
Nearlv Bare & Untilled Kv= 10.0 fps
12.7 775 Total

Basin M Type 1124-hr 2 yr Rainfall=3.55"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD®10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page3
Summary for Pond 1 P: Basin M
Inflow Area = 8.320 ac, 0.00% Impervious, Inflow Depth = 2.88" for 2 yr event
Inflow = 31.31 cfs @ 12.04 hrs, Volume= 2.000 of
Outflow = 4.01 cfs @ 12.50 hrs, Volume= 2.000 af, Atten= 87%, Lag= 27.6 min
Primary = 4.01 cfs @ 12.50 hrs, Volume= 2.000 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 227.12' @ 12.50 hrs Surf.Area= 23,722 sf Storage= 47,355 cf
Plug -Flow detention time= 681.3 min calculated for 1.999 of (100% of inflow)
Center -of -Mass det. time= 682.6 min ( 1,469.2 - 786.6 )
Volume Invert Avail.Storage Storage Description
#1 225.00' 94,208 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
225.00 20,800 0 0
226.00 22,176 21,488 21,488
227.00 23,552 22,864 44,352
228.00 24,928 24,240 68,592
229.00 26,304 25,616 94,208
Device Routing Invert Outlet Devices
#1 Primary 224.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 224.00' / 223.00' S= 0.02007 Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 226.00' 18.0" Horiz. 18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 225.00' 0.110 cfs 3" Skimmer
#4 Primary 227.25' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=4.01 cfs @ 12.50 hrs HW=227.12' (Free Discharge)
t=1=12" CMP Barrel (Barrel Controls 4.01 cfs @ 5.11 fps)
2=18" CMP Riser (Passes < 9.02 cfs potential flow)
3=3" Skimmer (Passes < 0.11 cfs potential flow)
=20' Secondary Spillway ( Controls 0.00 cfs)

Basin M Type 11 24-hr 10 yr Rainfall=5.17"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD® 10.00-20 s/n 07329 02017 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 1S: Watershed M
Runoff = 47.34 cfs @ 12.04 hrs, Volume= 3.103 af, Depth= 4.48"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr Rainfall=5.17"
Area (ac) CN Description
8.320 94 Newly graded area, HSG D
8.320 100.00% Pervious Area
Tc Length
Slope
Velocity Capacity
Description
(min) (feet)
(ft/ft)
(ft/sec) (cfs)
3.5 100
0.0250
0.47
Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
9.2 675
0.0150
1.22
Shallow Concentrated Flow, Shallow Concent.
Nearlv Bare & Unti lied Kv= 10.0 fas
12.7 775 Total

Basin M Type 1124-hr 10 yr Rainfall=5.17"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD® 10.00-20 s/n 07329 02017 HydroCAD Software Solutions LLC Page5
Summary for Pond 1 P: Basin M
Inflow Area = 8.320 ac, 0.00% Impervious, Inflow Depth = 4.48" for 10 yr event
Inflow = 47.34 cfs @ 12.04 hrs, Volume= 3.103 of
Outflow = 26.18 cfs @ 12.17 hrs, Volume= 3.103 af, Atten= 45%, Lag= 8.1 min
Primary = 26.18 cfs @ 12.17 hrs, Volume= 3.103 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 227.71' @ 12.17 hrs Surf.Area= 24,535 sf Storage= 61,667 cf
Plug -Flow detention time= 473.6 min calculated for 3.102 of (100% of inflow)
Center -of -Mass det. time= 475.0 min (1,250.2 - 775.2 )
Volume Invert Avail.Storage Storage Description
#1 225.00' 94,208 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
225.00 20,800 0 0
226.00 221176 21,488 21,488
227.00 23,552 22,864 44,352
228.00 24,928 24,240 68,592
229.00 26,304 25,616 94,208
Device Routing Invert Outlet Devices
#1 Primary 224.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 224.00' / 223.00' S= 0.0200 7' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 226.00' 18.0" Horiz.18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 225.00' 0.110 cfs 3" Skimmer
#4 Primary 227.25' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=25.32 cfs @ 12.17 hrs HW=227.70' (Free Discharge)
r=1=12" CMP Barrel (Barrel Controls 4.37 cfs @ 5.56 fps)
2=18" CMP Riser (Passes < 11.10 cfs potential flow)
3=3" Skimmer (Passes < 0.11 cfs potential flow)
=20' Secondary Spillway (Weir Controls 20.95 cfs @ 2.04 fps)

Basin M Type 11 24-hr 25 yr Rainfall=6.15"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD®10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment IS: Watershed M
Runoff = 56.95 cfs @ 12.04 hrs, Volume= 3.775 af, Depth= 5.45"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 25 yr Rainfall=6.15"
Area (ac) CN Description
8.320 94 Newly graded area, HSG D
8.320 100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
3.5 100
0.0250
0.47
Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
9.2 675
0.0150
1.22
Shallow Concentrated Flow, Shallow Concent.
Nearlv Bare & Untilled Kv= 10.0 fps
12.7 775 Total

Basin M Type 11 24-hr 25 yr Rainfall=6. 15"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD® 10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 7
Summary for Pond 1 P: Basin M
Inflow Area = 8.320 ac, 0.00% Impervious, Inflow Depth = 5.45" for 25 yr event
Inflow = 56.95 cfs @ 12.04 hrs, Volume= 3.775 of
Outflow = 40.36 cfs @ 12.14 hrs, Volume= 3.775 af, Atten= 29%, Lag= 6.1 min
Primary = 40.36 cfs @ 12.14 hrs, Volume= 3.775 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 227.89' @ 12.14 hrs Surf.Area= 24,774 sf Storage= 65,879 cf
Plug -Flow detention time= 402.6 min calculated for 3.774 of (100% of inflow)
Center -of -Mass det. time= 404.0 min ( 1,174.4 - 770.4 )
Volume Invert Avail.Storage Storage Description
#1 225.00' 94,208 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
225.00 20,800 0 0
226.00 22,176 21,488 21,488
227.00 23,552 22,864 44,352
228.00 24,928 24,240 68,592
229.00 26,304 25,616 94,208
Device Routing Invert Outlet Devices
#1 Primary 224.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 224.00' / 223.00' S= 0.0200 T Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 226.00' 18.0" Horiz. 18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 225.00' 0.110 cfs 3" Skimmer
#4 Primary 227.25' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=39.77 cfs @ 12.14 hrs HW=227.88' (Free Discharge)
i=12" CMP Barrel (Barrel Controls 4.47 cfs @ 5.70 fps)
12=18" CMP Riser (Passes < 11.67 cfs potential flow)
3=3" Skimmer (Passes < 0.11 cfs potential flow)
=20' Secondary Spillway (Weir Controls 35.30 cfs @ 2.35 fps)

Watershed N
Subcat Reach Pon Link
Basin N

Basin N Type Il 24-hr 2 yr Rainfall=3.55"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD®10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment IS: Watershed N
Runoff = 31.74 cfs @ 12.03 hrs, Volume= 1.976 af, Depth= 2.88"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=3.55"
Area (ac) CN Description
8.220 94 Newly graded area, HSG D
8.220 100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
3.9 100
0.0200
0.43
Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
7.9 890
0.0350
1.87
Shallow Concentrated Flow, Shallow Concent.
Nearlv Bare & Unti lied Kv= 10.0 fas
11.8 990 Total

Basin N Type 11 24-hr 2 yr Rainfall=3.55"
Prepared by (enter your company name here) Printed 10/15/2021
HydroCAD® 10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 3
Summary for Pond 1 P: Basin N
Inflow Area = 8.220 ac, 0.00% Impervious, Inflow Depth = 2.88" for 2 yr event
Inflow = 31.74 cfs @ 12.03 hrs, Volume= 1.976 of
Outflow = 3.99 cfs @ 12.47 hrs, Volume= 1.976 af, Atten= 87%, Lag= 26.6 min
Primary = 3.99 cfs @ 12.47 hrs, Volume= 1.976 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 227.10' @ 12.47 hrs Surf.Area= 23,631 sf Storage= 46,807 cf
Plug -Flow detention time 694.1 min calculated for 1.975 of (100% of inflow)
Center -of -Mass det. time= 695.4 min ( 1,481.2 - 785.8 )
Volume Invert Avail.Storage Storage Description
#1 225.00' 94,048 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
225.00 21,000 0 0
226.00 22,256 21,628 21,628
227.00 23,512 221884 44,512
228.00 24,768 24,140 68,652
229.00 26,024 25,396 94,048
Device Routing Invert Outlet Devices
#1 Primary 224.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 224.00' / 223.00' S= 0.0200 7' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 226.00' 18.0" Horiz. 18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 225.00' 0.110 cfs 3" Skimmer
#4 Primary 227.25' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary Out low Max=3.99 cfs @ 12.47 hrs HW=227.09' (Free Discharge)
=12" CMP Barrel (Barrel Controls 3.99 cfs @ 5.09 fps)
2=18" CMP Riser (Passes < 8.90 cfs potential flow)
3=3" Skimmer (Passes < 0.11 cfs potential flow)
-20' Secondary Spillway ( Controls 0.00 cfs)

Basin N Type 11 24-hr 10 yr Rainfall=5. ?7"
Prepared by {enter your company name here) Printed 10/15/2021
HydroCAD®10.00-20 s/n 07329 02017 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment IS: Watershed N
Runoff = 47.96 cfs @ 12.03 hrs, Volume= 3.066 af, Depth= 4.48"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr Rainfall=5.17"
Area (ac) CN Description
8.220 94 Newly graded area, HSG D
8.220 100.00% Pervious Area
Tc Length
Slope
Velocity Capacity
Description
(min) (feet)
(ft/ft)
(ft/sec) (cfs)
3.9 100
0.0200
0.43
Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
7.9 890
0.0350
1.87
Shallow Concentrated Flow, Shallow Concent.
Nearlv Bare & Untilled Kv= 10.0 fps
11.8 990 Total

Basin N Type // 24-hr 10 yr Rainfa11=5.17"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD®10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 5
Summary for Pond 1 P: Basin N
Inflow Area = 8.220 ac, 0.00% Impervious, Inflow Depth = 4.48" for 10 yr event
Inflow = 47.96 cfs @ 12.03 hrs, Volume= 3.066 of
Outflow = 25.81 cfs @ 12.16 hrs, Volume= 3.066 af, Men= 46%, Lag= 8.1 min
Primary = 25.81 cfs @ 12.16 hrs, Volume= 3.066 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 227.71' @ 12.16 hrs Surf.Area= 24,402 sf Storage= 61,623 cf
Plug -Flow detention time= 484.6 min calculated for 3.066 of (100% of inflow)
Center -of -Mass det. time= 484.2 min ( 1,258.6 - 774.4 )
Volume Invert Avail.Storage Storage Description
#1 225.00' 94,048 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
225.00 21,000 0 0
226.00 22,256 21,628 21,628
227.00 23,512 22,884 44,512
228.00 24,768 24,140 68,652
229.00 26,024 25,396 94,048
Device Routing Invert Outlet Devices
#1 Primary 224.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 224.00' / 223.00' S= 0.0200 '/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 226.00' 18.0" Horiz.18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 225.00' 0.110 cfs 3" Skimmer
#4 Primary 227.25' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary Out low Max=25.15 cfs @ 12.16 hrs HW=227.70' (Free Discharge)
h.
1:--11=12" CMP Barrel (Barrel Controls 4.37 cfs @ 5.56 fps)
2=18" CMP Riser (Passes < 11.09 cfs potential flow)
3=3" Skimmer (Passes < 0.11 cfs potential flow)
=20' Secondary Spillway (Weir Controls 20.78 cfs @ 2.04 fps)

Basin N Type // 24-hr 25 yr Rainfall=6. 95"
Prepared by {enter your company name here) Printed 10/15/2021
HydroCAD®10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment IS: Watershed N
Runoff = 57.69 cfs @ 12.03 hrs, Volume= 3.730 af, Depth= 5.45"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 25 yr Rainfall=6.15"
Area (ac) CN Description
8.220 94 Newly graded area, HSG D
8.220 100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
3.9 100
0.0200
0.43
Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
7.9 890
0.0350
1.87
Shallow Concentrated Flow, Shallow Concent.
Nearlv Bare & Until led Kv= 10.0 fas
11.8 990 Total

Basin N Type 1124-hr 25 yr Rainfall=6.15"
Prepared by (enter your company name here) Printed 10/15/2021
HydroCAD® 10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 7
Summary for Pond 1 P: Basin N
Inflow Area = 8.220 ac, 0.00% Impervious, Inflow Depth = 5.45" for 25 yr event
Inflow = 57.69 cfs @ 12.03 hrs, Volume= 3.730 of
Outflow = 40.91 cfs @ 12.12 hrs, Volume= 3.730 af, Atten= 29%, Lag= 5.7 min
Primary = 40.91 cfs @ 12.12 hrs, Volume= 3.730 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 227.90' @ 12.12 hrs Surf.Area= 24,636 sf Storage= 66,124 cf
Plug -Flow detention time= 410.3 min calculated for 3.728 of (100% of inflow)
Center -of -Mass det. time= 411.7 min ( 1,181.3 - 769.6 )
Volume Invert Avail.Storage Storage Description
#1 225.00' 94,048 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
225.00 21,000 0 0
226.00 22,256 21,628 21,628
227.00 23,512 22,884 44,512
228.00 24,768 24,140 68,652
229.00 26,024 25,396 94,048
Device Routing Invert Outlet Devices
#1 Primary 224.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 224.00' / 223.00' S= 0.0200 '/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 226.00' 18.0" Horiz. 18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 225.00' 0.110 cfs 3" Skimmer
#4 Primary 227.25' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=39.57 cfs @ 12.12 hrs HW=227.88' (Free Discharge)
=12" CMP Barrel (Barrel Controls 4.47 cfs @ 5.69 fps)
2=18" CMP Riser (Passes < 11.66 cfs potential flow)
3=3" Skimmer (Passes < 0.11 cfs potential flow)
=20' Secondary Spillway (Weir Controls 35.10 cfs @ 2.35 fps)

Watershed O
Subcat Reach Aon Lin k

Basin O Type 1124-hr 2 yr Rainfall=3.55"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD® 10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 1S: Watershed O
Runoff = 28.45 cfs @ 12.06 hrs, Volume= 1.937 af, Depth= 2.88"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=3.55"
Area (ac) CN Description
8.060 94 Newly graded area, HSG D
8.060 100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
4.1 100
0.0170
0.40
Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
10.7 787
0.0150
1.22
Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Untilled Kv= 10.0 fps
14.8 887 Total

Basin O Type Il 24-hr 2 yr Rainfall=3.55"
Prepared by {enter your company name here) Printed 10/15/2021
HydroCADO 10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 3
Summary for Pond 1 P: Basin O
Inflow Area = 8.060 ac, 0.00% Impervious, Inflow Depth = 2.88" for 2 yr event
Inflow = 28.45 cfs @ 12.06 hrs, Volume= 1.937 of
Outflow = 4.06 cfs @ 12.53 hrs, Volume= 1.937 af, Aften= 86%, Lag= 28.2 min
Primary = 4.06 cfs @ 12.53 hrs, Volume= 1.937 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 231.20' @ 12.53 hrs Surf.Area= 21,826 sf Storage= 45,154 cf
Plug -Flow detention time= 616.8 min calculated for 1.937 of (100% of inflow)
Center -of -Mass det. time= 618.0 min ( 1,406.6 - 788.6 )
Volume Invert Avail.Storage Storage Description
#1 229.00' 86,368 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
229.00 19,208 0 0
230.00 20,400 19,804 19,804
231.00 21,592 20,996 40,800
232.00 22,784 22,188 62,988
233.00 23,976 23,380 86,368
Device Routing Invert Outlet Devices
#1 Primary 228.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 228.00' / 227.00' S= 0.0200 T Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 230.00' 18.0" Horiz. 18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 229.00' 0.110 cfs 3" Skimmer
#4 Primary 231.25' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=4.06 cfs @ 12.53 hrs HW=231.20' (Free Discharge)
i=12" CMP Barrel (Barrel Controls 4.06 cfs @ 5.17 fps)
12=18" CMP Riser (Passes < 9.30 cfs potential flow)
3=3" Skimmer (Passes < 0.11 cfs potential flow)
-20' Secondary Spillway ( Controls 0.00 cfs)

Basin O Type 1124-hr 10 yr Rainfall=5.17"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD®10.00-20 s/n 07329 ©2017 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 1 S: Watershed O
Runoff = 43.06 cfs @ 12.06 hrs, Volume= 3.006 af, Depth= 4.48"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr Rainfall=5.17"
Area (ac) CN Description
8.060 94 Newly graded area, HSG D
8.060 100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
4.1 100
0.0170
0.40
Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
10.7 787
0.0150
1.22
Shallow Concentrated Flow, Shallow Concent.
Neariv Bare & Unti lied Kv=10.0 fps
14.8 887 Total

Basin 0 Type 1124-hr 10 yr Rainfall=5.17"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD® 10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 5
Summary for Pond 1 P: Basin O
Inflow Area = 8.060 ac, 0.00% Impervious, Inflow Depth = 4.48" for 10 yr event
Inflow = 43.06 cfs @ 12.06 hrs, Volume= 3.006 of
Outflow = 26.40 cfs @ 12.20 hrs, Volume= 3.006 af, Atten= 39%, Lag= 8.4 min
Primary = 26.40 cfs @ 12.20 hrs, Volume= 3.006 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 231.72' @ 12.20 hrs Surf.Area= 22,446 sf Storage= 56,702 cf
Plug -Flow detention time= 429.7 min calculated for 3.006 of (100% of inflow)
Center -of -Mass det. time= 429.2 min (1,206.4 - 777.2 )
Volume Invert Avail.Storage Storage Description
#1 229.00' 86,368 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet
229.00 19,208 0 0
230.00 20,400 19,804 19,804
231.00 21,592 20,996 40,800
232.00 22,784 22,188 62,988
233.00 23,976 23,380 86,368
Device Routing Invert Outlet Devices
#1 Primary 228.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 228.00' / 227.00' S= 0.0200 '/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 230.00' 18.0" Horiz. 18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 229.00' 0.110 cfs 3" Skimmer
#4 Primary 231.25' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=26.36 cfs @ 12.20 hrs HW=231.72' (Free Discharge)
Ti=3"
2" CMP Barrel (Barrel Controls 4.38 cfs @ 5.57 fps)
2=18" CMP Riser (Passes < 11.15 cfs potential flow)
Skimmer (Passes < 0.11 cfs potential flow)
=20' Secondary Spillway (Weir Controls 21.98 cfs @ 2.07 fps)

Basin O Type 1124-hr 25 yr Rainfall=6.15"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD®10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 1 S: Watershed O
Runoff = 51.82 cfs @ 12.06 hrs, Volume= 3.657 af, Depth= 5.45"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 25 yr Rainfall=6.15"
Area (ac) CN Description
8.060 94 Newly graded area, HSG D
8.060 100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
4.1 100
0.0170
0.40
Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
10.7 787
0.0150
1.22
Shallow Concentrated Flow, Shallow Concent.
Nearlv Bare & Untilled Kv= 10.0 fas
14.8 887 Total

Basin 0 Type // 24-hr 25 yr Rainfall=6.15"
Prepared by {enter your company name here) Printed 10/15/2021
HydroCAD@ 10.00-20 s/n 07329 02017 HydroCAD Software Solutions LLC Page 7
Summary for Pond 1 P: Basin 0
Inflow Area = 8.060 ac, 0.00% Impervious, Inflow Depth = 5.45" for 25 yr event
Inflow = 51.82 cfs @ 12.06 hrs, Volume= 3.657 of
Outflow = 39.52 cfs @ 12.16 hrs, Volume= 3.657 af, Atten= 24%, Lag= 6.0 min
Primary = 39.52 cfs @ 12.16 hrs, Volume= 3.657 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 231.88' @ 12.16 hrs Surf.Area= 22,639 sf Storage= 60,294 cf
Plug -Flow detention time= 366.0 min calculated for 3.657 of (100% of inflow)
Center -of -Mass det. time= 365.6 min ( 1,138.0 - 772.4 )
Volume Invert Avail.Storage Storage Description
#1 229.00' 86,368 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
229.00 19,208 0 0
230.00 20,400 19,804 19,804
231.00 21,592 20,996 40,800
232.00 22,784 22,188 62,988
233.00 23,976 23,380 86,368
Device Routing Invert Outlet Devices
#1 Primary 228.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 228.00' / 227.00' S= 0.0200 '/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 230.00' 18.0" Horiz. 18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 229.00' 0.110 cfs 3" Skimmer
#4 Primary 231.25' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=38.88 cfs @ 12.16 hrs HW=231.87' (Free Discharge)
h.
t=12" CMP Barrel (Barrel Controls 4.47 cfs @ 5.69 fps)
2=18" CMP Riser (Passes < 11.64 cfs potential flow)
3=3" Skimmer (Passes < 0.11 cfs potential flow)
=20' Secondary Spillway (Weir Controls 34.41 cfs @ 2.33 fps)

Watershed P
Subcat Reach Aon Llnk
Basin P

Basin P Type 1124-hr 2 yr Rainfall=3.55"
Prepared by {enter your company name here) Printed 10/15/2021
HydroCAD®10.00-20 s/n 07329 02017 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 1 S: Watershed P
Runoff = 29.46 cfs @ 12.01 hrs, Volume= 1.740 af, Depth= 2.88"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=3.55"
Area (ac) CN Description
7.240 94 Newly graded area, HSG D
7.240 100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
4.1 100
0.0170
0.40
Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
6.0 734
0.0410
2.02
Shallow Concentrated Flow, Shallow Concent.
Nearlv Bare & Untilled Kv= 10.0 fps
10.1 834 Total

Basin P Type // 24-hr 2 yr Rainfall=3.55"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCADO 10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 3
Summary for Pond 1 P: Basin P
Inflow Area = 7.240 ac, 0.00% Impervious, Inflow Depth = 2.88" for 2 yr event
Inflow = 29.46 cfs @ 12.01 hrs, Volume= 1.740 of
Outflow = 3.90 cfs @ 12.39 hrs, Volume= 1.740 af, Atten= 87%, Lag= 22.8 min
Primary = 3.90 cfs @ 12.39 hrs, Volume= 1.740 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 234.95' @ 12.39 hrs Surf.Area= 22,144 sf Storage= 40,635 cf
Plug -Flow detention time= 689.7 min calculated for 1.740 of (100% of inflow)
Center -of -Mass det. time= 690.9 min ( 1,475.1 - 784.2 )
Volume Invert Avail.Storage Storage Description
#1 233.00' 88,848 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet
233.00 19,500 0 0
234.00 20,856 20,178 20,178
235.00 22,212 21,534 41,712
236.00 23,568 22,890 64,602
237.00 24,924 24,246 88,848
Device Routing Invert Outlet Devices
#1 Primary 232.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 232.00' / 231.00' S= 0.0200 7' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 234.00' 18.0" Horiz. 18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 233.00' 0.110 cfs 3" Skimmer
#4 Primary 235.00' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary Out low Max=3.90 cfs @ 12.39 hrs HW=234.95' (Free Discharge)
r=12" CMP Barrel (Barrel Controls 3.90 cfs @ 4.97 fps)
2=18" CMP Riser (Passes < 8.29 cfs potential flow)
3=3" Skimmer (Passes < 0.11 cfs potential flow)
-20' Secondary Spillway ( Controls 0.00 cfs)

Basin P Type 11 24-hr 90 yr Rainfall=5. ?7"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD®10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment IS: Watershed P
Runoff = 44.51 cfs @ 12.01 hrs, Volume= 2.700 af, Depth= 4.48"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr Rainfall=5.17"
Area (ac) CN Description
7.240 94 Newly graded area, HSG D
7.240 100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
4.1 100
0.0170
0.40
Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
6.0 734
0.0410
2.02
Shallow Concentrated Flow, Shallow Concent.
Nearlv Bare & Until led Kv= 10.0 fas
10.1 834 Total

Basin P Type lI 24-hr 90 yr Rainfall=5.97"
Prepared by {enter your company name here) Printed 10/15/2021
HydroCAD® 10.00-20 s/n 07329 02017 HydroCAD Software Solutions LLC Page5
Summary for Pond 1 P: Basin P
Inflow Area = 7.240 ac, 0.00% Impervious, Inflow Depth = 4.48" for 10 yr event
Inflow = 44.51 cfs @ 12.01 hrs, Volume= 2.700 of
Outflow = 26.65 cfs @ 12.12 hrs, Volume= 2.700 af, Atten= 40%, Lag= 6.7 min
Primary = 26.65 cfs @ 12.12 hrs, Volume= 2.700 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 235.47' @ 12.12 hrs, Surf.Area= 22,853 sf Storage= 52,532 cf
Plug -Flow detention time= 476.2 min calculated for 2.700 of (100% of inflow)
Center -of -Mass det. time= 475.7 min (1,248.6 - 772.8 )
Volume Invert Avail.Storage Storage Description
#1 233.00' 88,848 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet
233.00 19,500 0 0
234.00 20,856 20,178 20,178
235.00 22,212 21,534 41,712
236.00 23,568 22,890 64,602
237.00 24,924 24,246 88,848
Device Routing Invert Outlet Devices
#1 Primary 232.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 232.00' / 231.00' S= 0.0200 '/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 234.00' 18.0" Horiz. 18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 233.00' 0.110 cfs 3" Skimmer
#4 Primary 235.00' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=25.70 cfs @ 12.12 hrs HW=235.46' (Free Discharge)
L=12" CMP Barrel (Barrel Controls 4.22 cfs @ 5.38 fps)
2=18" CMP Riser (Passes < 10.28 cfs potential flow)
3=3" Skimmer (Passes < 0.11 cfs potential flow)
=20' Secondary Spillway (Weir Controls 21.47 cfs @ 2.05 fps)

Basin P Type l! 24-hr 25 yr Rainfall=6. ?5"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD®10.00-20 s/n 07329 02017 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 1 S: Watershed P
Runoff = 53.53 cfs @ 12.01 hrs, Volume= 3.285 af, Depth= 5.45"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 25 yr Rainfall=6.15"
Area (ac) CN Description
7.240 94 Newly graded area, HSG D
7.240 100.00% Pervious Area
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(ft/ft)
(ft/sec)
(cfs)
4.1 100
0.0170
0.40
Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
6.0 734
0.0410
2.02
Shallow Concentrated Flow, Shallow Concent.
Nearlv Bare & Untilled Kv= 10.0 fps
10.1 834 Total

Basin P Type Il 24-hr 25 yr Rainfall=6.15"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD®10.00-20 s/n 07329 02017 HydroCAD Software Solutions LLC Page 7
Summary for Pond 1P: Basin P
Inflow Area = 7.240 ac, 0.00% Impervious, Inflow Depth = 5.45" for 25 yr event
Inflow = 53.53 cfs @ 12.01 hrs, Volume= 3.285 of
Outflow = 39.80 cfs @ 12.09 hrs, Volume= 3.285 af, Atten= 26%, Lag= 5.1 min
Primary = 39.80 cfs @ 12.09 hrs, Volume= 3.285 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 235.63' @ 12.09 hrs Surf.Area= 23,071 sf Storage= 56,209 cf
Plug -Flow detention time= 402.6 min calculated for 3.284 of (100% of inflow)
Center -of -Mass det. time= 403.9 min ( 1,171.9 - 768.0 )
Volume Invert Avail.Storage Storage Description
#1 233.00' 88,848 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
233.00 19,500 0 0
234.00 20,856 20,178 20,178
235.00 221212 21,534 41,712
236.00 23,568 22,890 64,602
237.00 24,924 24,246 88,848
Device Routing Invert Outlet Devices
#1 Primary 232.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 232.00' / 231.00' S= 0.0200 '/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 234.00' 18.0" Horiz.18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 233.00' 0.110 cfs 3" Skimmer
#4 Primary 235.00' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary Out low Max=39.28 cfs @ 12.09 hrs HW=235.63' (Free Discharge)
L=12" CMP Barrel (Barrel Controls 4.32 cfs @ 5.51 fps)
2=18" CMP Riser (Passes < 10.86 cfs potential flow)
3=3" Skimmer (Passes < 0.11 cfs potential flow)
=20' Secondary Spillway (Weir Controls 34.96 cfs @ 2.34 fps)

1S v Aip
Watershed Q
9 Reach Aon Llnk
Basin Q

Basin Q Type !I 24-hr 2 yr Rainfall=3.55"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD®10.00-20 s/n 07329 02017 HydroCAD Software Solutions LLC Page_ 2
Summary for Subcatchment IS: Watershed Q
Runoff = 55.29 cfs @ 12.05 hrs, Volume= 3.541 af, Depth= 2.68"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr Rainfall=3.55"
Area (ac) CN Description
13.950
94 Newly graded area, HSG D
1.880
80 >75% Grass cover, Good, HSG D
15.830
92 Weighted Average
15.830
100.00% Pervious Area
Tc Length
Slope
Velocity Capacity
Description
(min) (feet)
(ft/ft)
(ft/sec) (cfs)
3.9 100
0.0200
0.43
Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
9.6 1,060
0.0340
1.84
Shallow Concentrated Flow, Shallow Concent.
Nearlv Bare & Untilled Kv= 10.0 fps
13.5 1,160 Total

c
Basin Q Type 11 24-hr 2 yr Rainfall=3.55"
Prepared by (enter your company name here} Printed 10/15/2021
HydroCADO 10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 3
Summary for Pond 1 P: Basin Q
Inflow Area = 15.830 ac, 0.00% Impervious, Inflow Depth = 2.68" for 2 yr event
Inflow = 55.29 cfs @ 12.05 hrs, Volume= 3.541 of
Outflow = 4.04 cfs @ 12.92 hrs, Volume= 3.541 af, Aften= 93%, Lag= 52.5 min
Primary = 4.04 cfs @ 12.92 hrs, Volume= 3.541 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 219.17' @ 12.92 hrs Surf.Area= 44,432 sf Storage= 88,939 cf
Plug -Flow detention time= 700.7 min calculated for 3.540 of (100% of inflow)
Center -of -Mass det. time= 701.8 min ( 1,499.7 - 797.8 )
Volume Invert Avail.Storage Storage Description
#1 217.00' 175,241 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
217.00 38,000 0 0
218.00 40,297 39,149 39,149
219.00 43,915 42,106 81,255
220.00 46,975 45,445 126,700
221.00 50,107 48,541 175,241
Device Routing Invert Outlet Devices
#1 Primary 216.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 216.00' / 215.00' S= 0.0200 '/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 218.00' 18.0" Horiz. 18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 217.00' 0.230 cfs 4" Skimmer
#4 Primary 219.50' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=4.04 cfs @ 12.92 hrs HW=219.17' (Free Discharge)
L=12" CMP Barrel (Barrel Controls 4.04 cfs @ 5.15 fps)
2=18" CMP Riser (Passes < 9.20 cfs potential flow)
3=4" Skimmer (Passes < 0.23 cfs potential flow)
=20' Secondary Spillway ( Controls 0.00 cfs)

Basin Q Type 11 24-hr 10 yr Rainfall=5.97"
Prepared by {enter your company name here) Printed 10/15/2021
HydroCAD®10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 1 S: Watershed Q
Runoff = 85.43 cfs @ 12.05 hrs, Volume= 5.614 af, Depth= 4.26"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr Rainfall=5.17"
Area (ac) CN Description
13.950 94 Newly graded area, HSG D
1.880 80 >75% Grass cover, Good, HSG D
15.830 92 Weighted Average
15.830 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
3.9 100 0.0200 0.43 Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
9.6 1,060 0.0340 1.84 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Untilled Kv= 10.0 fps
13.5 1,160 Total

Basin Q Type 1124-hr 14 yr Rainfall=5.17"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD@ 10.00-20 s/n 07329 02017 HydroCAD Software Solutions LLC Page 5
Summary for Pond 1 P: Basin Q
Inflow Area = 15.830 ac, 0.00% Impervious, Inflow Depth = 4.26" for 10 yr event
Inflow = 85.43 cfs @ 12.05 hrs, Volume= 5.614 of
Outflow = 26.51 cfs @ 12.28 hrs, Volume= 5.614 af, Aften= 69%, Lag= 13.7 min
Primary = 26.51 cfs @ 12.28 hrs, Volume= 5.614 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 219.97' @ 12.28 hrs Surf.Area= 46,872 sf Storage= 125,165 cf
Plug -Flow detention time= 511.7 min calculated for 5.611 of (100% of inflow)
Center -of -Mass det. time= 512.9 min ( 1,298.2 - 785.3 )
Volume Invert Avail.Storage Storage Description
#1 217.00' 175,241 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
217.00 38,000 0 0
218.00 40,297 39,149 39,149
219.00 43,915 42,106 81,255
220.00 46,975 45,445 126,700
221.00 50,107 48,541 175,241
Device Routing Invert Outlet Devices
#1 Primary 216.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 216.00' / 215.00' S= 0.0200'/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 218.00' 18.0" Horiz. 18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 217.00' 0.230 cfs 4" Skimmer
#4 Primary 219.50' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=26.32 cfs @ 12.28 hrs HW=219.96' (Free Discharge)
T3=4!'
2" CMP Barrel (Barrel Controls 4.52 cfs @ 5.76 fps)
2=18" CMP Riser (Passes < 11.92 cfs potential flow)
Skimmer (Passes < 0.23 cfs potential flow)
=20' Secondary Spillway (Weir Controls 21.80 cfs @ 2.06 fps)

4
Basin Q Type/1 24-hr 25 yr Rainfall=6.95"
Prepared by {enter your company name here) Printed 10/15/2021
HydroCAD®10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment IS: Watershed Q
Runoff = 103.49 cfs @ 12.05 hrs, Volume= 6.882 af, Depth= 5.22"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 25 yr Rainfall=6.15"
Area (ac) CN Description
13.950 94 Newly graded area, HSG D
1.880 80 >75% Grass cover, Good, HSG D
15.830 92 Weighted Average
15.830 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
3.9 100 0.0200 0.43 Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.55"
9.6 1,060 0.0340 1.84 Shallow Concentrated Flow, Shallow Concent.
Nearlv Bare & Untilled Kv= 10.0 fps
13.5 1,160 Total

A
Basin Q Type 1124-hr 25 yr Rainfall=6.15"
Prepared by {enter your company name here} Printed 10/15/2021
HydroCAD@ 10.00-20 s/n 07329 02017 HydroCAD Software Solutions LLC Page 7
Summary for Pond 1 P: Basin Q
Inflow Area = 15.830 ac, 0.00% Impervious, Inflow Depth = 5.22" for 25 yr event
Inflow = 103.49 cfs @ 12.05 hrs, Volume= 6.882 of
Outflow = 51.13 cfs @ 12.21 hrs, Volume= 6.882 af, Atten= 51 %, Lag= 9.6 min
Primary = 51.13 cfs @ 12.21 hrs, Volume= 6.882 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 220.25' @ 12.21 hrs Surf.Area= 47,762 sf Storage= 138,902 cf
Plug -Flow detention time= 437.4 min calculated for 6.879 of (100% of inflow)
Center -of -Mass det. time= 438.6 min ( 11218.6 - 779.9 )
Volume Invert Avail.Storage Storage Description
#1 217.00' 175,241 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
217.00 38,000 0 0
218.00 40,297 39,149 39,149
219.00 43,915 42,106 81,255
220.00 46,975 45,445 126,700
221.00 50,107 48,541 175,241
Device Routing Invert Outlet Devices
#1 Primary 216.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet / Outlet Invert= 216.00' / 215.00' S= 0.02007 Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 218.00' 18.0" Horiz. 18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 217.00' 0.230 cfs 4" Skimmer
#4 Primary 219.50' 20' Secondary Spillway, C= 3.27
Offset (feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=50.72 cfs @ 12.21 hrs HW=220.25' (Free Discharge)
1=12" CMP Barrel (Barrel Controls 4.68 cfs @ 5.96 fps)
�2=18" CMP Riser (Passes < 12.76 cfs potential flow)
3=4" Skimmer (Passes < 0.23 cfs potential flow)
=20' Secondary Spillway (Weir Controls 46.04 cfs @ 2.52 fps)