20230912_ESC

ENGINEERING i? ENVIRONMENTAL SCIENCE COMPANY
3008 ANDERSON DRIVE,SUITE 102
RALEIGH,NO 27609
[phone]
August 11, 2023
Mr. Hunter Stone
Toisnot Preserve LLC
3204 Nash St.,North, Suite C
Wilson,NC 27896
RE: Erosion Control Evaluation
Dunne Hole Mine
NC HWY 222
Stantonsburg,NC
Dear Mr. Stone:
Attached are the calculations for the sizing of the seven (7) sediment basins. The basin
surface area was based on 10-year rain frequency, although due to the relatively flat
topography, the water surface area will be larger than the basin design. The outlet
structure design was based on the 25-year rain frequency. As mining progresses it is
likely that no stormwater discharges will occur.
Approximately 0.1 cubic yards if concrete will be need for anchoring the riser pipe.
Please contact me if you have any questions
Sincerely,
T'. Patrick S . E.
President ` "

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9
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Seasonally High Hydrologic
Soil Symbol Soil Name Groundwater Table Group
AaA Altavista 1.5'-2.5' C
Na Nahunta 1.0'-1.5' C
KaA Kalmia
3.5'-6.0' B
La Lakeland >6.0' A
WhA Wickham >6.0' B
WaB Wagram 5.0'-6.5' A
' A
Rm Rimini >6.0 ////���� /� ENGINEERING BENVIRONMENTAL
Johns 1.5'-3.0' C / � ! � SCIENCE COMPANY
Jo LL//\\\`/\J
3LEI H,NORTH
DR.,SUITE 102
To Torhunta 0.0'-1.01 C RALEIGH,NORTH CAROLINA 27609
Lv Lumbee 0.0'-1.0' B/D [phone]
DATE
USDA Soil Survey 0srosrz3
Dunnie Hole Mine
Wayne County, NC

1S
Watershed #1 Basin #1
Routing Diagram for Basin#1
Subcat Reach on Link Prepared by E2S
HydroCADOO 10.00-26 sln 07329 ©2020 HydroCAD Software Solutions LLC

Basin #1 Type //24-hr 2 yr Rainfall=3.59"
Prepared by E2S Page 2
H droCADO 10.00-26 s/n 07329 ©2020 H droCAD Software Solutions LLC
Summary for Subcatchment IS: Watershed#1
Runoff = 18.90 cfs @ 12.78 hrs, Volume= 3.413 af, Depth= 2.18"
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=3.59"
Area ac CN Description
18.800 86 Newlyraded area, HSG B
18.800 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min feet ft/ft ft/sec cfs
9.8 100 0.0019 0.17 Sheet Fallown Flow,0 050 Sheet P2= 3.59"
63.3 1,655 0.0019 0.44 Shallow Concentrated Flow, Shallow Concent.
Nearlv Bare& Untilled Kv= 10.0 f s
73.1 1,755 Total

4' es
Basin #1 Type //24-hr 2 yr Rainfall=3.59"
Prepared by E2S
H►droCAD®10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 3
Summary for Pond 1 P: Basin #1
Inflow Area = 18.800 ac, 0.00% Impervious, Inflow Depth = 2.18" for 2 yr event
Inflow = 18.90 cfs @ 12.78 hrs, Volume= 3.413 of
Outflow = 4.77 cfs @ 14.19 hrs, Volume= 3.412 af, Atten= 75%, Lag= 85.1 min
Primary = 4.77 cfs @ 14.19 hrs, Volume= 3.412 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 103.92' @ 14.19 hrs Surf.Area= 21,831 sf Storage= 73,127 cf
Plug-Flow detention time= 873.1 min calculated for 3.410 of(100% of inflow)
Center-of-Mass det. time= 874.9 min ( 1,751.7-876.9 )
Volume Invert Avail.Stora a Storage Description
#1 100.00, 122,088 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet
100.00 15,488 0 0
101.00 17,108 16,298 16,298
102.00 18,728 17,918 34,216
103.00 20,348 19,538 53,754
104.00 21,968 21,158 74,912
105.00 23,588 22,778 97,690
106.00 25,208 24,398 122,088
Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke=0.900
Inlet/Outlet Invert= 99.00'/98.50' S=0.0100'/' Cc=0.900
n= 0.025 Corrugated metal, Flow Area=0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 100.00' 0.110 cfs 3"Skimmer
#4 Primary 104.00' 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=4.77 cfs @ 14.19 hrs HW=103.92' (Free Discharge)
1=12 CMP Barrel (Barrel Controls 4.77 cfs @ 6.07 fps)
32=18"CMP Riser (Passes < 11.78 cfs potential flow)
3=3" Skimmer Passes < 0.11 cfs potential flow)
4=20' Secondary Spillway ( Controls 0.00 cfs)

's a
Basin #1 Type 1124-hr 10 yr Rainfall=5.56"
Prepared by E2S Page 4
H ydroCAD®10.00-26 s/n 07329 ©2020 H droCAD Software Solutions LLC
Summary for Subcatchment IS: Watershed #1
Runoff = 34.58 cfs @ 12.77 hrs, Volume= 6.255 af, Depth= 3.99"
Runoff by SCS TR-20 method, UH=SCS, Wei hted-CN, Time S an= 0.00-120.00 hrs, dt= 0.05 hrs
9 p
Type II 24-hr 10 yr Rainfall=5.56"
Area ac CN Description
18.800 86 Newly graded area, HSG B
18.800 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) ft/ft) (ft/sec) (cfs
9.8 100 0.0019 0.17 Sheet Flow, Sheet
Fallow n=0.050 P2=3.59"
63.3 1,655 0.0019 0.44 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Untilled Kv= 10.0 fps
73.1 1,755 Total

9 d
Basin #1 Type //24-hr 10 yr Rainfall=5.56"
Prepared by E2S
HydroCADO 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 5
Summary for Pone! 1 P: Basin#1
Inflow Area= 18.800 ac, 0.00% Impervious, Inflow Depth = 3.99" for 10 yr event
Inflow = 34.58 cfs @ 12.77 hrs, Volume= 6.255 of
Outflow = 30.79 cfs @ 13.03 hrs, Volume= 6.254 af, Atten= 11%, Lag= 16.1 min
Primary = 30.79 cfs @ 13.03 hrs, Volume= 6.254 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 104.52' @ 13.03 hrs Surf.Area= 22,802 sf Storage= 86,645 cf
Plug-Flow detention time= 510.6 min calculated for 6.254 of(100% of inflow)
Center-of-Mass det. time= 510.5 min ( 1,370.1 -859.7 )
_Volume Invert Avail Storage Storage Description
#1 100.00, 122,088 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
100.00 15,488 0 0
101.00 17,108 16,298 16,298
102.00 18,728 17,918 34,216
103.00 20,348 19,538 53,754
104.00 21,968 21,158 74,912
105.00 23,588 22,778 97,690
106.00 25,208 24,398 122,088
Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke=0.900
Inlet/Outlet Invert=99.00'/98.50' S= 0.0100'/' Cc=0.900
n=0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 100.00' 0.110 cfs 3"Skimmer
#4 Primary 104.00' 20' Secondary Spillway, C=3627
Offset(feet) 0.00 4.50 24.50 29.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=30.68 cfs @ 13.03 hrs HW=104.51' (Free Discharge)
1=12" CMP Barrel (Barrel Controls 5.08 cfs @ 6.47 fps)
JL2=18"CMP Riser (Passes < 13.49 cfs potential flow)
3=3"Skimmer (Passes < 0.11 cfs potential flow)
=20' Secondary Spillway (Weir Controls 25.60 cfs @ 2.16 fps)

9 "n
Basin #1 Type 1124-hr 25 yr Rainfall=6.95"
Prepared by E2S Page 6
HydroCAD®10.00-26 s/n 07329 ©2020 H droCAD Software Solutions LLC
Summary for Subcatchment IS: Watershed #`i
Runoff = 45.74 cfs @ 12.76 hrs, Volume= 8.331 af, Depth= 5.32"
Runoff by SCS TR-20 method, UH=SCS, Wei hted-CN, Time Sp an=0.00-120.00 hrs, dt= 0.05 hrs
g
Type II 24-hr 25 yr Rainfall=6.95"
Area ac CN Description
18.800 86 Newly graded area, MSG B
18.800 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min feet fUft ft/sec cfs
9.8 100 0.0019 0.17 Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.59"
63.3 1,655 0.0019 0.44 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare& Untilled Kv= 10.0 fps
73.1 1,755 Total

Basin #1 Type 1124-hr 25 yr Rainfall=6.95"
Prepared by E2S
HydroCAD®10.00-26 s/n 07329 ©2020 H droCAD Software Solutions LLC Page 7
Summary for Pond I P: Basin #1
Inflow Area - 18.800 ac, 0.00% Impervious, Inflow Depth = 5.32" for 25 yr event
Inflow = 45.74 cfs @ 12.76 hrs, Volume= 8.331 of
Outflow = 44.52 cfs @ 12.89 hrs, Volume= 8.330 af, Atten= 3%, Lag= 7.6 min
Primary = 44.52 cfs @ 12.89 hrs, Volume= 8.330 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 104.68' @ 12.89 hrs Surf.Area= 23,064 sf Storage= 90,323 cf
Plug-Flow detention time=398.1 min calculated for 8.330 of(100% of inflow)
Center-of-Mass det. time= 398.0 min ( 1,249.6 -851.6 )
Volume Invert Avail.Stora a Storage Description
#1 100.00, 122,088 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet
100.00 15,488 0 0
101.00 17,108 16,298 16,298
102.00 18,728 17,918 34,216
103.00 20,348 19,538 53,754
104.00 21,968 21,158 74,912
105.00 23,588 22,778 97,690
106.00 25,208 24,398 122,088
Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke=0.900
Inlet/Outlet Invert= 99.00'/98.50' S= 0.0100 '/' Cc= 0.900
n=0.025 Corrugated metal, Flow Area=0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18" CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 100.00' 0.110 cfs 3"Skimmer
#4 Primary 104.00' 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=44.47 cfs @ 12.89 hrs HW=104.68' (Free Discharge)
1=12"CMP Barrel (Barrel Controls 5.17 cfs @ 6.58 fps)
t2=18" CMP Riser (Passes < 13.92 cfs potential flow)
3=3 Skimmer Passes < 0.11 cfs potential flow)
4=20'Secondary Spillway (Weir Controls 39.30 cfs @ 2.42 fps)

(2S
Watershed #2 Basin #2
Subcat Reach on Link Routing Diagram for Basin#2
Prepared by E2S
HydroCADO 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC

s Y
Basin #2 Type 11 24-hr 2 yr Rainfall=3.59"
Prepared by E2S
HydroCADO 10.00-26 s/n 07329 @ 2020 HydroCAD Software Solutions LLC Page 3
Summary for Pond 2P: Basin #2
Inflow Area = 10.800 ac, 0.00% Impervious, Inflow Depth = 2.18" for 2 yr event
Inflow = 7.87 cfs @ 13.30 hrs, Volume= 1.960 of
Outflow = 4.23 cfs @ 14.31 hrs, Volume= 1.960 af, Atten=46%, Lag=60.6 min
Primary - 4.23 cfs @ 14.31 hrs, Volume= 1.960 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 102.98' @ 14.31 hrs Surf.Area= 12,355 sf Storage= 31,369 cf
Plug-Flow detention time= 580.3 min calculated for 1.960 of(100% of inflow)
Center-of-Mass det.time= 581.4 min ( 1,494.0 -912.5 )
Volume Invert Avail Storage Storage Description
#1 100.00, 74,304 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet
100.00 8,712 0 0
101.00 9,936 9,324 9,324
102.00 11,160 10,548 19,872
103.00 12,384 11,772 31,644
104.00 13,608 12,996 44,640
105.00 14,832 14,220 58,860
106.00 16,056 15,444 74,304
Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12"CMP Barrel
L=50.0' CMP, projecting, no headwall, Ke=0.900
Inlet/Outlet Invert= 99.00'/98.50' S= 0.0100 'I' Cc=0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C=0.600
Limited to weir flow at low heads
#3 Device 1 100.00, 0.110 cfs 3"Skimmer
#4 Primary 103.00' 10' Secondary Spillway, C=3.27
Offset(feet) 0.00 4.50 14.50 19.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=4.23 cfs @ 14.31 hrs HW=102.98' (Free Discharge)
1=12"CMP Barrel (Barrel Controls 4.23 cfs @ 5.39 fps)
T_ =18" CMP Riser (Passes < 8.41 cfs potential flow)
_' _ " Passes < 0.11 cfs potential flow)
3 3 Skimmer (
4=10' Secondary Spillway ( Controls 0.00 cfs)

f i
Basin #2 Type //24-hr 10 yr Rainfall=5.56"
Prepared by E2S
HydroCAD®10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 2S: Watershed #2
Runoff = 14.40 cfs @ 13.29 hrs, Volume= 3.593 af, Depth= 3.99"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type 11 24-hr 10 yr Rainfall=5.56"
Area (ac) CN Description
_ 10.800 86 Newly graded area, HSG B
10.800 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs
12.7 100 0.0010 0.13 Sheet Flow, Sheet
Fallow n=0.050 P2= 3.59"
99.4 1,886 0.0010 0.32 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Unti lied Kv= 10.0 fps
112.1 1,986 Total

i
Basin #2 Type 1124-hr 10 yr Rainfall=5.56"
Prepared by E2S
HydroCADO 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 5
Summary for Pond 2P: Basin #2
Inflow Area = 10.800 ac, 0.00% Impervious, Inflow Depth = 3.99" for 10 yr event
Inflow - 14.40 cfs @ 13.29 hrs, Volume= 3.593 of
Outflow = 13.91 cfs @ 13.46 hrs, Volume= 3.593 af, Atten= 3%, Lag= 10.4 min
Primary = 13.91 cfs @ 13.46 hrs, Volume= 3.593 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 103.41' @ 13.46 hrs Surf.Area= 12,885 sf Storage= 36,964 cf
Plug-Flow detention time=337.8 min calculated for 3.592 of(100% of inflow)
Center-of-Mass det.time= 339.0 min ( 1,234.3-895.4 )
_Volume Invert Avail Storage Storage Description
#1 100.00, 74,304 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet
100.00 8,712 0 0
101.00 9,936 9,324 9,324
102.00 11,160 10,548 19,872
103.00 12,384 11,772 31,644
104.00 13,608 12,996 44,640
105.00 14,832 14,220 58,860
106.00 16,056 15,444 74,304
Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12"CMP Barrel
L=50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet/Outlet Invert=99.00'/98.50' S= 0.0100'/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 100.00' 0.110 cfs 3"Skimmer
#4 Primary 103.00' 10' Secondary Spillway, C=3.27
Offset(feet) 0.00 4.50 14.50 19.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=13.89 cfs @ 13.46 hrs HW=103.41' (Free Discharge)
1=12 CMP Barrel (Barrel Controls 4.49 cfs @ 5.72 fps)
3 2=18"CMP Riser (Passes < 10.10 cfs potential flow)
_ " Passes < 0.11 cfs potential flow)
3 3 Skimmer (
4=10' Secondary Spillway (Weir Controls 9.40 cfs @ 1.84 fps)

f i
Basin #2 Type 11 24-hr 25 yr Rainfall=6.95"
Prepared by E2S
HydroCADO 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 2S: Watershed #2
Runoff = 19.06 cfs @ 13.28 hrs, Volume= 4.786 af, Depth= 5.32"
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=6.95"
_ Area (ac) CN Description
10.800 86 Newly graded area, HSG B
10.800 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
12.7 100 0.0010 0.13 Sheet Flow, Sheet
Fallow n=0.050 P2= 3.59"
99.4 1,886 0.0010 0.32 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Untilled Kv= 10.0 fps
112.1 1,986 Total

f i
Basin #2 Type 1124-hr 25 yr Rainfall=6.95"
Prepared by E2S
H ydroCADO 10.00-26 s/n 07329 ©2020 H droCAD Software Solutions LLC Page 7
Summary for Pond 2Po Basin #2
Inflow Area = 10.800 ac, 0.00% Impervious, Inflow Depth = 5.32" for 25 yr event
Inflow = 19.06 cfs @ 13.28 hrs, Volume= 4.786 of
Outflow = 18.92 cfs @ 13.35 hrs, Volume= 4.786 af, Atten= 1%, Lag= 4.3 min
Primary = 18.92 cfs @ 13.35 hrs, Volume= 4.786 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt=0.05 hrs
Peak Elev= 103.53' @ 13.35 hrs Surf.Area= 13,036 sf Storage= 38,570 cf
Plug-Flow detention time=263.2 min calculated for 4.784 of(100% of inflow)
Center-of-Mass det. time= 264.4 min ( 1,151.7- 887.3 )
Volume Invert Avail.Stora a Storage Description
#1 100.00, 74,304 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet
100.00 8,712 0 0
101.00 9,936 9,324 9,324
102.00 11,160 10,548 19,872
103.00 12,384 11,772 31,644
104.00 13,608 12,996 44,640
105.00 14,832 14,220 58,860
106.00 16,056 15,444 74,304
Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke=0.900
Inlet/Outlet Invert= 99.00'198.50' S= 0.0100'1' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C=0.600
Limited to weir flow at low heads
#3 Device 1 100.00, 0.110 cfs 3"Skimmer
#4 Primary 103.00' 10' Secondary Spillway, C=3.27
Offset(feet) 0.00 4.50 14.50 19.00
Height(feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=18.90 cfs @ 13.35 hrs HW=103.53' (Free Discharge)
1=12"CMP Barrel (Barrel Controls 4.56 cfs @ 5.81 fps)
CMP Riser (Passes < 10.53 cfs potential flow)
t'12=18"
3 3 "_ Skimmer Passes < 0.11 cfs potential flow)
4=10'Secondary Spillway (Weir Controls 14.34 cfs @ 2.04 fps)

3S
Watershed #3 Basin #3
SubCat Reach on Link Routing Diagram for Basin#3
Prepared by E2S
HydroCAD®10.00-26 s(n 07329 ©2020 HydroCAD Software Solutions LLC

Basin #3 Type //24-hr 2 yr Rainfall=3.59"
Prepared by E2S
HydroCADO 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 3S: Watershed #3
Runoff = 25.33 cfs @ 12.98 hrs, Volume= 5.191 af, Depth= 2.18"
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=3.59"
_ Area (ac) CN Description
28.600 86 Newly graded area, HSG B
28.600 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
12.7 100 0.0010 0.13 Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.59"
74.1 1,405 0.0010 0.32 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Untilled Kv= 10.0 fps
86.8 1,505 Total

T •
Basin #3 Type 1124-hr 2 yr Rainfall=3.59"
Prepared by E2S Page 3
HydroCAD®10.00-26 sln 07329 ©2020 H droCAD Software Solutions LLC
Summary for Pond 3P: Basin #3
Inflow Area = 28.600 ac, 0.00% Impervious, Inflow Depth = 2.18" for 2 yr event
Inflow - 25.33 cfs @ 12.98 hrs, Volume= 5.191 of
Outflow = 4.96 cfs @ 14.99 hrs, Volume= 5.191 af, Atten= 80%, Lag= 120.9 min
Primary - 4.96 cfs @ 14.99 hrs, Volume= 5.191 of
Routing by Stor-Ind method, Time Span=0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 104.28' @ 14.99 hrs Surf.Area= 32,830 sf Storage= 122,263 cf
Plug-Flow detention time= 774.1 min calculated for 5.189 of(100% of inflow)
Center-of-Mass det. time= 775.5 min ( 1,664.8-889.3 )
Volume Invert Avail.Stora a Storage Description
#1 100.00, 181,488 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
_ (feet) (so-ft) (cubic-feet) (cubic-feet
100.00 24,200 0 0
101.00 26,216 25,208 25,208
102.00 28,232 27,224 52,432
103.00 30,248 29,240 81,672
104.00 32,264 31,256 112,928
105.00 34,280 33,272 146,200
106.00 36,296 35,288 181,488
Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12"CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke=0.900
Inlet/Outlet Invert=99.00'/98.50' S= 0.0100 '/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 100.00' 0.230 cfs 4"Skimmer
#4 Primary 104.50' 25' Secondary Spillway, C=3.27
Offset(feet) 0.00 4.50 29.50 34.00
Height(feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=4.96 cfs @ 14.99 hrs HW=104.28' (Free Discharge)
k. -12 CMP Barrel (Barrel Controls 4.96 cfs @ 6.32 fps)
2=18"CMP Riser (Passes < 12.85 cfs potential flow)
3=4 Skimmer (Passes < 0.23 cfs potential flow)
4=25'Secondary Spillway ( Controls 0.00 cfs)

Basin #3 Type 1124-hr 10 yr Rainfall=5.56"
Prepared by E2S
HydroCAD®10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 3S: Watershed #3
Runoff = 46.23 cfs @ 12.96 hrs, Volume= 9.516 af, Depth= 3.99"
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=5.56"
Area (ac) CN Description
28.600 86 Newly graded area, HSG B
28.600 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (fUft) (ft/sec) (cfs
12.7 100 0.0010 0.13 Sheet Flow, Sheet
Fallow n= 0.050 P2=3.59"
74.1 1,405 0.0010 0.32 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Unti lied Kv= 10.0 fps
86.8 1,505 Total

? S
Basin #3 Type //24-hr 10 yr Rainfall=5.56"
Prepared by E2S
HydroCAD@ 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 5
Summary for Pond 3P: Basin #3
Inflow Area = 28.600 ac, 0.00% Impervious, Inflow Depth = 3.99" for 10 yr event
Inflow = 46.23 cfs @ 12.96 hrs, Volume= 9.516 of
Outflow = 38.81 cfs @ 13.32 hrs, Volume= 9.516 af, Atten= 16%, Lag=21.9 min
Primary = 38.81 cfs @ 13.32 hrs, Volume= 9.516 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt=0.05 hrs
Peak Elev= 105.03' @ 13.32 hrs Surf.Area=34,347 sf Storage= 147,371 cf
Plug-Flow detention time=479.0 min calculated for 9.512 of(100% of inflow)
Center-of-Mass det. time=480.6 min ( 1,352.7-872.1 )
_Volume Invert Avail Storage Storage Description
#1 100.00, 181,488 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
100.00 24,200 0 0
101.00 26,216 25,208 25,208
102.00 28,232 27,224 52,432
103.00 30,248 29,240 81,672
104.00 32,264 31,256 112,928
105.00 34,280 33,272 146,200
106.00 36,296 35,288 181,488
Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12"CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet/Outlet Invert= 99.00'/98.50' S= 0.0100 '/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area=0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 100.00' 0.230 cfs 4"Skimmer
#4 Primary 104.50' 25'Secondary Spillway, C=3.27
Offset(feet) 0.00 4.50 29.50 34.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=38.66 cfs @ 13.32 hrs HW=105.03' (Free Discharge)
1=12"CMP Barrel (Barrel Controls 6.34 cfs @ 6.80 fps)
3112=18" CMP Riser (Passes < 14.82 cfs potential flow)
=4"Skimmer (Passes < 0.23 cfs potential flow)
4=25' Secondary Spillway (Weir Controls 33.32 cfs @ 2.22 fps)

Basin #3 Type 11 24-hr 25 yr Rainfall=6.95"
Prepared by E2S
H droCADO 10.00-26 s/n 07329 ©2020 H droCAD Software Solutions LLC Page 6
Summary for Subcatchment 3S; Watershed #3
Runoff = 61.16 cfs @ 12.95 hrs, Volume= 12.674 af, Depth= 5.32"
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=6.95"
Area (ac) CN Description
28.600 86 Newly graded area, HSG B
28.600 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
_ (min) (feet) (fUft) (fUsec) (cfs
12.7 100 0.0010 0.13 Sheet Flow, Sheet
Fallow n=0.050 P2= 3.59"
74.1 1,405 0.0010 0.32 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Untilled Kv= 10.0 f s
86.8 1,505 Total

Basin #3 Type 11 24-hr 25 yr Rainfall=6.95"
Prepared by E2S
HydroCAD®10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 7
Summary for Pond 3Pv Basin #3
Inflow Area = 28.600 ac, 0.00% Impervious, Inflow Depth = 5.32" for 25 yr event
Inflow = 61.16 cfs @ 12.95 hrs, Volume= 12.674 of
Outflow = 58.68 cfs @ 13.12 hrs, Volume= 12.674 af, Atten=4%, Lag= 10.2 min
Primary = 58.68 cfs @ 13.12 hrs, Volume= 12.674 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 105.22' @ 13.12 hrs Surf.Area= 34,721 sf Storage= 153,918 cf
Plug-Flow detention time= 384.5 min calculated for 12.668 of(100% of inflow)
Center-of-Mass det. time=386.1 min ( 1,250.2-864.1 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 181,488 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
100.00 24,200 0 0
101.00 26,216 25,208 25,208
102.00 28,232 27,224 52,432
103.00 30,248 29,240 81,672
104.00 32,264 31,256 112,928
105.00 34,280 33,272 146,200
106.00 36,296 35,288 181,488
Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12"CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet/Outlet Invert= 99.00'/98.50' S= 0.0100'/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area=0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C=0.600
Limited to weir flow at low heads
#3 Device 1 100.00' 0.230 cfs 4"Skimmer
#4 Primary 104.50' 25'Secondary Spillway, C=3.27
Offset (feet) 0.00 4.50 29.50 34.00
Height(feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=58.56 cfs @ 13.12 hrs HW=105.22' (Free Discharge)
1=12"CMP Barrel (Barrel Controls 5.43 cfs @ 6.91 fps)
1 2=18"CMP Riser (Passes < 15.26 cfs potential flow)
3=4"Skimmer (Passes < 0.23 cfs potential flow)
4=25' Secondary Spillway (Weir Controls 53.13 cfs @ 2.53 fps)

(4S
Watershed #4 Basin #4
Subcat Reach on Link Routing Diagram for Basin#4
Prepared by E2S
HydroCAD®10.00-26 sln 07329 0 2020 HydroCAD Software Solutions LLC

Basin #4 Type ll 24-hr 2 yr Rainfall=3.59"
Prepared by E2S
HydroCAD®10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 4S: Watershed #4
Runoff = 18.75 cfs @ 12.19 hrs, Volume= 1.634 af, Depth= 2.18"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type 11 24-hr 2 yr Rainfall=3.59"
Area (ac) CN Description
_ 9.000 86 Newly graded area, HSG B
9.000 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
12.7 100 0.0010 0.13 Sheet Flow, Sheet
Fallow n=0.050 P2=3.59"
12.9 851 0.0120 1.10 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Untilled Kv= 10.0 fps
25.6 951 Total

'r
Basin #4 Type/1 24-hr 2 yr Rainfall=3.59"
Prepared by E2S
HydroCADO 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 3
Summary for Pond 4P: Basin #4
I nflow Area = 9.000 ac, 0.00% Impervious, Inflow Depth = 2.18" for 2 yr event
Inflow = 18.75 cfs @ 12.19 hrs, Volume= 1.634 of
Outflow = 3.05 cfs @ 12.90 hrs, Volume= 1.634 af, Atten= 84%, Lag=42.5 min
Primary = 3.05 cfs @ 12.90 hrs, Volume= 1.634 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt=0.05 hrs
Peak Elev= 102.33' @ 12.90 hrs Surf.Area= 18,485 sf Storage= 38,964 cf
Plug-Flow detention time= 1,551.9 min calculated for 1.633 of(100% of inflow)
Center-of-Mass det. time= 1,553.5 min ( 2,386.3-832.7 )
Volume Invert Avail Storage Storage Description
#1 100.00, 117,264 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
100.00 14,792 0 0
101.00 16,376 15,584 15,584
102.00 17,960 17,168 32,752
103.00 19,544 18,752 51,504
104.00 21,128 20,336 71,840
105.00 221712 21,920 93,760
106.00 24,296 23,504 117,264
Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12"CMP Barrel
L=50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet/Outlet Invert= 99.00'/98.50' S= 0.0100 7' Cc= 0.900
n=0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 100.00' 0.110 cfs 3"Skimmer
#4 Primary 103.00' 10' Secondary Spillway, C=3.27
Offset(feet) 0.00 4.50 14.50 19.00
Height(feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=3.05 cfs @ 12.90 hrs HW=102.33' (Free Discharge)
1=12"CMP Barrel (Passes 3.05 cfs of 3.82 cfs potential flow)
JL2=18"CMP Riser (Weir Controls 2.94 cfs @ 1.88 fps)
3=3"Skimmer (Constant Controls 0.11 cfs)
4=10'Secondary Spillway ( Controls 0.00 cfs)

i
Basin #4 Type 1124-hr 10 yr Rainfall=5.56"
Prepared by E2S
HydroCADO 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 5
Summary for Pored 4Po Basin #4
Inflow Area = 9.000 ac, 0.00% Impervious, Inflow Depth = 3.99" for 10 yr event
Inflow = 33.94 cfs @ 12.19 hrs, Volume= 2.995 of
Outflow = 14.38 cfs @ 12.51 hrs, Volume= 2.994 af, Atten= 58%, Lag= 19.2 min
Primary = 14.38 cfs @ 12.51 hrs, Volume= 2.994 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 103.42' @ 12.51 hrs Surf.Area= 20,213 sf Storage= 60,091 cf
Plug-Flow detention time=884.3 min calculated for 2.993 of(100% of inflow)
Center-of-Mass det. time= 886.2 min ( 1,701.7-815.5 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 117,264 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
100.00 14,792 0 0
101.00 16,376 15,584 15,584
102.00 17,960 17,168 32,752
103.00 19,544 18,752 51,504
104.00 21,128 20,336 71,840
105.00 221712 21,920 93,760
106.00 24,296 23,504 117,264
Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12" CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke=0.900
Inlet/Outlet Invert= 99.00'/98.50' S= 0.0100 '/' Cc=0.900
n=0.025 Corrugated metal, Flow Area=0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 100.00' 0.110 cfs 3"Skimmer
#4 Primary 103.00' 10'Secondary Spillway, C=3.27
Offset(feet) 0.00 4.50 14.50 19.00
Height(feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=14.34 cfs @ 12.51 hrs HW=103.42' (Free Discharge)
1=12" CMP Barrel (Barrel Controls 4.50 cfs @ 5.72 fps)
t:2=18"CMP Riser (Passes < 10.14 cfs potential flow)
3=3"Skimmer (Passes < 0.11 cfs potential flow)
4=10' Secondary Spillway (Weir Controls 9.85 cfs @ 1.87 fps)

Basin ##4 Type 1124-hr 25 yr Rainfall=6.95"
Prepared by E2S
HydroCAD®10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 4S: Watershed #4
Runoff = 44.71 cfs @ 12.18 hrs, Volume= 3.988 af, Depth= 5.32"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt=0.05 hrs
Type 11 24-hr 25 yr Rainfall=6.95,
Area ac CN Description
9.000 86 Newly graded area, HSG B
9.000 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs
12.7 100 0.0010 0.13 Sheet Flow, Sheet
Fallow n=0.050 P2= 3.59"
12.9 851 0.0120 1.10 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Untilled Kv= 10.0 f s
25.6 951 Total

Basin #4 Type 1l 24-hr 25 yr Rainfall=6.95"
Prepared by E2S
H ydroCAM 10.00-26 s/n 07329 O 2020 H droCAD Software Solutions LLC Page 7
Summary for Pond 4P: Basin #4
Inflow Area = 9.000 ac, 0.00% Impervious, Inflow Depth = 5.32" for 25 yr event
Inflow = 44.71 cfs @ 12.18 hrs, Volume= 3.988 of
Outflow = 31.07 cfs @ 12.36 hrs, Volume= 3.988 af, Atten= 31%, Lag= 10.8 min
Primary = 31.07 cfs @ 12.36 hrs, Volume= 3.988 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 103.77' @ 12.36 hrs Surf.Area=20,769 sf Storage= 67,230 cf
Plug-Flow detention time= 677.8 min calculated for 3.986 of(100% of inflow)
Center-of-Mass det. time=679.8 min ( 1,487.3-807.5 )
Volume Invert Avail Storage Storage Description
#1 100.00, 117,264 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc-Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet
100.00 14,792 0 0
101.00 16,376 15,584 15,584
102.00 17,960 17,168 32,752
103.00 19,544 18,752 51,504
104.00 21,128 20,336 71,840
105.00 22,712 21,920 93,760
106.00 24,296 23,504 117,264
Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12"CMP Barrel
L=50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet/Outlet Invert= 99.00'/98.50' S= 0.0100'/' Cc=0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 100.00, 0.110 cfs 3"Skimmer
#4 Primary 103.00' 10'Secondary Spillway, C=3.27
Offset (feet) 0.00 4.50 14.50 19.00
Height(feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=30.74 cfs @ 12.36 hrs HW=103.77' (Free Discharge)
1=12"CMP Barrel (Barrel Controls 4.69 cfs @ 5.97 fps)
CMP Riser (Passes < 11.31 cfs potential flow)
t2=18"
= Passes < 0.11 cfs potential flow)
3 3 Skimmer (
4=10' Secondary Spillway (Weir Controls 26.05 cfs @ 2.32 fps)

(5S)
Watershed #5 Basin #5
Routing Diagram for Basin#5
Subcat Reach on Link Prepared by E2S
HydroCAD®10.00.26 s/n 07329 ©2020 HydroCAD Software Solutions LLC

Basin #5 Type 1124-hr 2 yr Rainfall=3.59"
Prepared by E2S Page 2
H ydroCADO 10.00-26 s/n 07329 ©2020 H droCAD Software Solutions LLC
Summary for Subcatchment 5S: Watershed#5
Runoff = 15.67 cfs @ 12.19 hrs, Volume= 1.343 af, Depth= 2.18"
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=3.59"
Area ac CN Description
7.400 86 Newly graded area, HSG B
7.400 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min feet ft/ft ftlsec cfs
12.7 100 0.0010 0.13 Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.59"
12.5 473 0.0040 0.63 Shallow Concentiated led low10.0 f Shallow Concent.
Nearly Bare& U P
25.2 573 Total

r i
Basin #5 Type/1 24-hr 2 yr Rainfall=3.59"
Prepared by E2S Pa e 3
HvdroCAD@ 10.00-26 s/n 07329 @ 2020 H droCAD Software Solutions LLC
Summary for Pond 5Po Basin #5
Inflow Area = 7.400 ac, 0.00% Impervious, Inflow Depth = 2.18" for 2 yr event
Inflow = 15.57 cfs @ 12.19 hrs, Volume= 1.343 of
Outflow = 2.15 cfs @ 12.99 hrs, Volume= 1.343 af, Atten= 86%, Lag=48.0 min
Primary = 2.15 cfs @ 12.99 hrs, Volume= 1.343 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 102.26' @ 12.99 hrs Surf.Area= 16,135 sf Storage=32,828 cf
Plug-Flow detention time= 1,474.9 min calculated for 14 43 of(100% of inflow)
Center-of-Mass det. time= 1,476.3 min ( 2,308.7 832. )
Volume Invert Avail.Stora a Storage Description
#1 100.00, 103,368 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
100.00 12,800 0
101.00 14,276 13,538 13,538
102.00 15,752 15,014 28,552
103.00 17,228 16,490 45,042
104.00 18,704 17,966 63,008
105.00 20,180 19,442 82,450
106.00 21,656 20,918 103,368
Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12" CMP Barrel
L=50.0' CMP, projecting, no headwall, Ke=0.900
Inlet/Outlet Invert= 99.00'/98.50' S= 0.0100 '/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 100.00' 0.110 cfs 3"Skimmer
#4 Primary 103.00' 10' Secondary Spillway, C=3.27
Offset(feet) 0.00 4.50 14.50 19.50
Height(feet) 1.50 0.00 0.00 1.50
Primary Outflow Max=2.14 cfs @ 12.99 hrs HW=102.t6al (Free Discharge)
=12" CMP Barrel (Passes 2.14 cfs of 3.77 cfs potential flow)
2=18" CMP Riser (Weir Controls 2.03 cfs @ 1.66 fps)
3=3"Skimmer (Constant Controls 0.11 cfs)
4=10'Secondary Spillway ( Controls 0.00 cfs)

r �
Basin #5 Type 1124-hr 10 yr Rainfall=5.56"
Prepared by E2S
HydroCADO 10.00-26 sln 07329 4 2020 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchrnent 5S: Watershed #5
Runoff = 28.18 cfs @ 12.18 hrs, Volume= 2.462 af, Depth= 3.99"
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=5.56"
Area ac CN Description
7.400 86 Newly Laded area, HSG B
7.400 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftlft) (fUsec) (cfs
12.7 100 0.0010 0.13 Sheet Flow, Sheet
Fallow n=0.050 P2= 3.59"
12.5 473 0.0040 0.63 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Untilled Kv= 10.0 fps
25.2 573 Total

Basin ##5 Type 11 24-hr 10 yr Rainfall=5.56"
Prepared by E2S
HydroCAD®10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 5
Summary for Pond 5P: Basin ##5
Inflow Area = 7.400 ac, 0.00% Impervious, Inflow Depth = 3.99" for 10 yr event
Inflow = 28.18 cfs @ 12.18 hrs, Volume= 2.462 of
Outflow = 10.45 cfs @ 12.54 hrs, Volume= 2.462 af, Atten= 63%, Lag=21.3 min
Primary - 10.45 cfs @ 12.54 hrs, Volume= 2.462 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 103.31' @ 12.54 hrs Surf.Area= 17,682 sf Storage= 50,565 cf
Plug-Flow detention time=840.3 min calculated for 2.461 of(100% of inflow)
Center-of-Mass det.time=842.0 min ( 1,657.1 -815.1 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 103,368 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
100.00 12,800 0 0
101.00 14,276 13,538 13,538
102.00 15,752 15,014 28,552
103.00 17,228 16,490 45,042
104.00 18,704 17,966 63,008
105.00 20,180 19,442 821450
106.00 21,656 20,918 103,368
Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12" CMP Barrel
L=50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet/Outlet Invert= 99.00'/98.50' S= 0.0100'/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 100.00' 0.110 cfs 3"Skimmer
#4 Primary 103.00' 10'Secondary Spillway, C=3.27
Offset (feet) 0.00 4.50 14.50 19.50
Height(feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=10.39 cfs @ 12.54 hrs HW=103.31' (Free Discharge)
1=12" CMP Barrel (Barrel Controls 4.43 cfs @ 5.64 fps)
T__1
18"CMP Riser (Passes < 9.72 cfs potential flow)
3=3" Skimmer (Passes < 0.11 cfs potential flow)
4=10' Secondary Spillway (Weir Controls 5.96 cfs @ 1.63 fps)

Basin #5 Type 11 24-hr 25 yr Rainfall=6.95"
Prepared by E2S Page 6
H droCADO 10.00-26 s/n 07329 ©2020 H droCAD Software Solutions LLC
Summary for Subcatchment 5S: Watershed ##5
Runoff = 37.13 cfs @ 12.18 hrs, Volume= 3.279 af, Depth= 5.32"
Runoff by SCS TR-20 method, UH=SCS, Wei9 hted-CN, Time Span=0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 25 yr Rainfall=6.95"
Area ac CN Description
7.400 86 Newly graded area, HSG B
7.400 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min feet ft/ft) (ft/sec) (cfs
12.7 100 0.0010 0.13 Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.59
12.5 473 0.0040 0.63 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare&Untilled Kv= 10.0 f s
25.2 573 Total

Basin #5 Type lI 24-hr 25 yr Rainfall=6.95"
Prepared by E2S Page 7
H ydroCAD®10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC _ 4
Summary for Pond 5P: Basin ##5
Inflow Area = 7.400 ac, 0.00% Impervious, Inflow Depth = 5.32" for 25 yr event
Inflow = 37.13 cfs @ 12.18 hrs, Volume= 3.279 of
Outflow = 24.64 cfs @ 12.37 hrs, Volume= 3.279 af, Atten= 34%, Lag= 11.4 min
Primary = 24.64 cfs @ 12.37 hrs, Volume= 3.279 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 103.65' @ 12.37 hrs Surf.Area= 18,189 sf Storage= 56,736 cf
Plug-Flow detention time=644.8 min calculated for 3.278 of(100% of inflow)
Center-of-Mass det. time=646.5 min ( 1,453.7-807.1 )
Volume Invert Avail.Stora a Storage Description
#1 100.00, 103,368 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
_ (feet) (sq-ft) (cubic-feet) (cubic-feet
100.00 12,800 0 0
101.00 14,276 13,538 13,538
102.00 15,752 15,014 28,552
103.00 17,228 16,490 45,042
104.00 18,704 17,966 63,008
105.00 20,180 19,442 82,450
106.00 21,656 20,918 103,368
Device Routinq Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12"CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet/Outlet Invert= 99.00'/98.50' S=0.0100 '/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C=0.600
Limited to weir flow at low heads
#3 Device 1 100.00, 0.110 cfs 3"Skimmer
#4 Primary 103.00' 10' Secondary Spillway, C=3.27
Offset (feet) 0.00 4.50 14.50 19.50
Height(feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=24.30 cfs @ 12.37 hrs HW=103.64' (Free Discharge)
1=12" CMP Barrel (Barrel Controls 4.62 cfs @ 5.89 fps)
�2=18" CMP Riser (Passes < 10.91 cfs potential flow)
3=3" Skimmer (Passes < 0.11 cfs potential flow)
4=10' Secondary Spillway (Weir Controls 19.68 cfs @ 2.17 fps)

(6S ) Z 6P
Watershed #6 Basin #6
Routing Diagram for Basin 96
Subcat Reach A Link prepared by E2S
HydroCADa 10.00-26 sln 07329 ©2020 HydroCAD Software Solutions LLC

Basin #6 Type Il 24-hr 2 yr Rainfall=3.59"
Prepared by E2S Pacie 2
H droCAD®10.00-26 sln 07329 @ 2020 H droCAD Software Solutions LLC
Summary for Subcatchment 6S: Watershed #6
Runoff = 11.94 cfs @ 12.22 hrs, Volume= 1.107 af, Depth= 2.18"
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=3.59"
Area ac CN Description
6.100 86 Newly graded area, HSG B
6.100 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min feet ft/ft) (ft/sec) (cfs
12.7 100 0.0010 0.13 Sheet
n 0 050 Flows
l � Sheet P2- 3.59"
15.6 661 0.0050 0.71 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Untilled Kv= 10.0 fps
28.3 761 Total

Basin #6 Type //24-hr 2 yr Rainfall=3.59"
Prepared by E2S
HydroCADO 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 3
Summary for Pond 6Pe Basin #6
Inflow Area = 6.100 ac, 0.00% Impervious, Inflow Depth = 2.18" for 2 yr event
Inflow = 11.94 cfs @ 12.22 hrs, Volume= 1.107 of
Outflow = 2.29 cfs @ 12.91 hrs, Volume= 1.107 af, Aften=81%, Lag= 41.1 min
Primary = 2.29 cfs @ 12.91 hrs, Volume= 1.107 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt=0.05 hrs
Peak Elev= 102.27' @ 12.91 hrs Surf.Area= 12,743 sf Storage= 25,726 cf
Plug-Flow detention time= 1,156.6 min calculated for 1.107 of(100% of inflow)
Center-of-Mass det. time= 1,157.7 min ( 1,992.9-835.2 )
Volume Invert Avail Storage Storage Description
#1 100.00, 82,128 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
_ (feet) (sq-ft) (cubic-feet) (cubic-feet)
100.00 9,800 0 0
101.00 11,096 10,448 10,448
102.00 12,392 11,744 22,192
103.00 13,688 13,040 35,232
104.00 14,984 14,336 49,568
105.00 16,280 15,632 65,200
106.00 17,576 16,928 82,128
Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12"CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet/Outlet Invert= 99.00'/98.50' S= 0.0100'1' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 100.00' 0.110 cfs 3"Skimmer
#4 Primary 103.00' 10'Secondary Spillway, C=3.27
Offset(feet) 0.00 4.50 14.50 19.50
Height(feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=2.28 cfs @ 12.91 hrs HW=102.27' (Free Discharge)
1=12" CMP Barrel (Passes 2.28 cfs of 3.78 cfs potential flow)
3 2=18"CMP Riser (Weir Controls 2.17 cfs @ 1.70 fps)
= "
3 3 Skimmer (Constant Controls 0.11 cfs)
4=10'Secondary Spillway ( Controls 0.00 cfs)

Basin ##6 Type Il 24-hr 10 yr Rainfall=5.56"
Prepared by E2S
HydroCAD@ 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchrnent 6S: Watershed #6
Runoff = 21.64 cfs @ 12.22 hrs, Volume= 2.030 af, Depth= 3.99"
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=5.56"
Area (ac) CN Description
6.100 86 Newly graded area, HSG B
6.100 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
12.7 100 0.0010 0.13 Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.59"
15.6 661 0.0050 0.71 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare& Untilled Kv= 10.0 fps
28.3 761 Total

Basin #6 Type Il 24-hr 10 yr Rainfall=5.56"
Prepared by E2S
HydroCAD®10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 5
Summary for Pond 6P: Basin #6
Inflow Area = 6.100 ac, 0.00% Impervious, Inflow Depth = 3.99" for 10 yr event
Inflow = 21.64 cfs @ 12.22 hrs, Volume= 2.030 of
Outflow = 9.57 cfs @ 12.55 hrs, Volume= 2.030 af, Atten= 56%, Lag= 20.3 min
Primary = 9.57 cfs @ 12.55 hrs, Volume= 2.030 of
Routing by Stor-Ind method, Time Span=0.00-120.00 hrs, dt=0.05 hrs
Peak Elev= 103.28' @ 12.55 hrs Surf.Area= 14,048 sf Storage= 39,219 cf
Plug-Flow detention time=661.1 min calculated for 2.029 of(100%of inflow)
Center-of-Mass det. time=662.4 min ( 1,480.4-818.0 )
Volume Invert Avail Storage Storage Description
#1 100.00, 82,128 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
100.00 9,800 0 0
101.00 11,096 10,448 10,448
102.00 12,392 11,744 22,192
103.00 13,688 13,040 35,232
104.00 14,984 14,336 49,568
105.00 16,280 15,632 65,200
106.00 17,576 16,928 82,128
_Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12"CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke=0.900
Inlet/Outlet Invert= 99.00'/98.50' S= 0.0100 '/' Cc=0.900
n= 0.025 Corrugated metal, Flow Area=0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 100.00' 0.110 cfs 3"Skimmer
#4 Primary 103.00' 10' Secondary Spillway, C=3.27
Offset(feet) 0.00 4.50 14.50 19.50
Height(feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=9.53 cfs @ 12.55 hrs HW=103.28' (Free Discharge)
1=12" CMP Barrel (Barrel Controls 4.41 cfs @ 5.62 fps)
t.2=18"CMP Riser (Passes < 9.62 cfs potential flow)
3=3"Skimmer (Passes < 0.11 cfs potential flow)
4=10' Secondary Spillway (Weir Controls 5.11 cfs @ 1.57 fps)

Basin #6 Type //24-hr 25 yr Rainfall=6.95"
Prepared by E2S
HydroCAD@ 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 6So Watershed #6
Runoff = 28.52 cfs @ 12.21 hrs, Volume= 2.703 af, Depth= 5.32"
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=6.95"
Area (ac) CN Description
6.100 86 Newly graded area, HSG B
6.100 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
12.7 100 0.0010 0.13 Sheet Flow, Sheet
Fallow n=0.050 P2= 3.59"
15.6 661 0.0050 0.71 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Untilled Kv= 10.0 fps
28.3 761 Total

• 9t 1
Basin #6 Type //24-hr 25 yr Rainfall=6.95"
Prepared by E2S
HydroCAD@ 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 7
Summary for Pond 6P: Basin #6
Inflow Area = 6.100 ac, 0.00% Impervious, Inflow Depth = 5.32" for 25 yr event
Inflow = 28.52 cfs @ 12.21 hrs, Volume= 2.703 of
Outflow = 20.84 cfs @ 12.40 hrs, Volume= 2.703 af, Atten= 27%, Lag= 11.0 min
Primary = 20.84 cfs @ 12.40 hrs, Volume= 2.703 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt=0.05 hrs
Peak Elev= 103.57' @ 12.40 hrs Surf.Area= 14,430 sf Storage= 43,444 cf
Plug-Flow detention time= 510.4 min calculated for 2.703 of(100% of inflow)
Center-of-Mass det. time= 510.0 min ( 1,320.0-810.0 )
Volume Invert Avail Storage Storage Description
#1 100.00, 82,128 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet}
100.00 9,800 0 0
101.00 11,096 10,448 10,448
102.00 12,392 11,744 22,192
103.00 13,688 13,040 35,232
104.00 14,984 14,336 49,568
105.00 16,280 15,632 65,200
106.00 17,576 16,928 82,128
Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12"CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke=0.900
Inlet/Outlet Invert= 99.00'/98.50' S= 0.0100 'P Cc= 0.900
n= 0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 100.00' 0.110 cfs 3"Skimmer
#4 Primary 103.00' 10' Secondary Spillway, C=3.27
Offset (feet) 0.00 4.50 14.50 19.50
Height(feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=20.77 cfs @ 12.40 hrs HW=103.57' (Free Discharge)
1=12"CMP Barrel (Barrel Controls 4.58 cfs @ 5.83 fps)
t'2=11 8"
CMP Riser (Passes < 10.67 cfs potential flow)
3=3"Skimmer (Passes < 0.11 cfs potential flow)
4=10'Secondary Spillway (Weir Controls 16.18 cfs @ 2.08 fps)

i7S 7P
Watershed #7 Basin #7
Subcat Reach On Link Routing Diagram for Basin#7
Prepared by E2S
FycroCAD0 10.00-26 sin 07329 9 2020 HydroCAD Software Solutions LLC

Basin ##7 Type //24-hr 2 yr Rainfall=3.59"
Prepared by E2S
H droCAD®10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 7S: Watershed #7
Runoff = 25.25 cfs @ 12.21 hrs, Volume= 2.269 af, Depth= 2.18"
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=3.59"
Area (ac) CN Description
12.500 86 Newly graded area, HSG B
12.500 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (fUft) (ft/sec) (cfs)
12.7 100 0.0010 0.13 Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.59"
14.2 711 0.0070 0.84 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare& Untilled Kv= 10.0 fps
26.9 811 Total

Basin #7 Type 1124-hr 2 yr Rainfall=3.59"
Prepared by E2S
HydroCAD®10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 3
Summary for Pond 7P: Basin #7
Inflow Area = 12.500 ac, 0.00% Impervious, Inflow Depth = 2.18" for 2 yr event
Inflow = 25.25 cfs @ 12.21 hrs, Volume= 2.269 of
Outflow = 3.52 cfs @ 13.05 hrs, Volume= 2.269 af, Atten= 86%, Lag= 50.9 min
Primary = 3.52 cfs @ 13.05 hrs, Volume= 2.269 of
Routing by Stor-Ind method,Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 102.36' @ 13.05 hrs Surf.Area= 25,911 sf Storage= 54,564 cf
Plug-Flow detention time= 1,146.1 min calculated for 2.268 of(100% of inflow)
Center-of-Mass det. time= 1,147.1 min ( 1,981.0-833.9 )
_Volume Invert Avail Storage Storage Description
#1 100.00, 165,000 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
100.00 20,000 0 0
101.00 221500 21,250 21,250
102.00 25,000 23,750 45,000
103.00 27,500 26,250 71,250
104.00 30,000 28,750 100,000
105.00 32,500 31,250 131,250
106.00 35,000 33,750 165,000
_Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12"CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke=0.900
Inlet/Outlet Invert=99.00'/98.50' S=0.0100'/' Cc= 0.900
n=0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"'CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 100.00' 0.230 cfs 4 Skimmer
#4 Primary 103.00' 10' Secondary Spillway, C=3.27
Offset(feet) 0.00 4.50 14.50 19.50
Height(feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=3.62 cfs @ 13.05 hrs HW=102.36' (Free Discharge)
1=12" CMP Barrel (Passes 3.62 cfs of 3.84 cfs potential flow)
2=18"CMP Riser (Weir Controls 3.39 cfs @ 1.97 fps)
3=4"Skimmer (Constant Controls 0.23 cfs)
4=10' Secondary Spillway ( Controls 0.00 cfs)

A' T at
basin #7 Type 11 24-hr 10 yr Rainfall=5.56"
Prepared by E2S
HydroCADO 10.00-26 s/n 07329 @ 2020 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 7Se Watershed #7
Runoff = 45.74 cfs @ 12.20 hrs, Volume= 4.159 af, Depth= 3.99"
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=5.56"
Area (ac) CN Description
12.500 86 Newly graded area, HSG B
12.500 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
12.7 100 0.0010 0.13 Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.59"
14.2 711 0.0070 0.84 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Untilled Kv= 10.0 fps
26.9 811 Total

!I" r K
Basin #7 Type 1124-hr 10 yr Rainfall=5.56"
Prepared by E2S
HydroCAD®10.00-26 sin 07329 ©2020 HydroCAD Software Solutions LLC Page 5
Summary for Pond 7P: Basin #7
Inflow Area = 12.500 ac, 0.00% Impervious, Inflow Depth = 3.99" for 10 yr event
Inflow = 45.74 cfs @ 12.20 hrs, Volume= 4.159 of
Outflow = 17.26 cfs @ 12.57 hrs, Volume= 4.159 af, Atten=62%, Lag=22.3 min
Primary = 17.26 cfs @ 12.57 hrs, Volume= 4.159 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 103.49' @ 12.57 hrs Surf.Area= 28,731 sf Storage= 85,405 cf
Plug-Flow detention time=673.2 min calculated for 4.157 of(100% of inflow)
Center-of-Mass det. time= 674.4 min ( 1,491.1 -816.7)
Volume Invert Avail Storage Storage Description
#1 100.00, 165,000 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
100.00 20,000 0 0
101.00 22,500 21,250 21,250
102.00 25,000 23,750 45,000
103.00 27,500 26,250 71,250
104.00 30,000 28,750 100,000
105.00 32,500 31,250 131,250
106.00 35,000 33,750 165,000
_Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12"CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet/Outlet Invert= 99.00'/98.50' S= 0.0100'/' Cc= 0.900
n= 0.025 Corrugated metal, Flow Area=0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C= 0.600
Limited to weir flow at low heads
#3 Device 1 100.00' 0.230 cfs 4"Skimmer
#4 Primary 103.00' 10'Secondary Spillway, C=3.27
Offset(feet) 0.00 4.50 14.50 19.50
Height(feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=17.14 cfs @ 12.57 hrs HW=103.49' (Free Discharge)
1=12"CMP Barrel (Barrel Controls 4.54 cfs @ 5.77 fps)
JL2=18"CMP Riser (Passes < 10.39 cfs potential flow)
3=4"Skimmer (Passes < 0.23 cfs potential flow)
4=10'Secondary Spillway (Weir Controls 12.61 cfs @ 1.96 fps)

Masan #7 Type/1 24-hr 25 yr Rainfall=6.95"
Prepared by E2S
HydroCAD®10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 7S: Watershed #7
Runoff - 60.28 cfs @ 12.20 hrs, Volume= 5.539 af, Depth= 5.32"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type 11 24-hr 25 yr Rainfall=6.95"
Area (ac) CN Description
12.500 86 Newly graded area, HSG B
12.500 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
12.7 100 0.0010 0.13 Sheet Flow, Sheet
Fallow n=0.050 P2= 3.59"
14.2 711 0.0070 0.84 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Untilled Kv= 10.0 fps
26.9 811 Total

c � r
Basin ##7 Type //24-hr 25 yr Rainfall=6.95"
Prepared by E2S
HydroCAM 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 7
Summary for Ponca 7P: Basin #7
Inflow Area = 12.500 ac, 0.00% Impervious, Inflow Depth = 5.32" for 25 yr event
Inflow = 60.28 cfs @ 12.20 hrs, Volume= 5.539 of
Outflow = 38.03 cfs @ 12.41 hrs, Volume= 5.539 af, Atten=37%, Lag= 13.0 min
Primary = 38.03 cfs @ 12.41 hrs, Volume= 5.539 of
Routing by Stor-Ind method, Time Span=0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 103.88' @ 12.41 hrs Surf.Area=29,710 sf Storage= 96,660 cf
Plug-Flow detention time= 521.5 min calculated for 5.537 of(100% of inflow)
Center-of-Mass det. time= 522.8 min ( 1,331.5-808.7 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 165,000 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
100.00 20,000 0 0
101.00 22,500 21,250 21,250
102.00 25,000 23,750 45,000
103.00 27,500 26,250 71,250
104.00 30,000 28,750 100,000
105.00 32,500 31,250 131,250
106.00 35,000 33,750 165,000
Device Routing Invert Outlet Devices
#1 Primary 99.00' 12.0" Round 12"CMP Barrel
L= 50.0' CMP, projecting, no headwall, Ke= 0.900
Inlet/Outlet Invert=99.00'/98.50' S= 0.0100 '/' Cc= 0.900
n=0.025 Corrugated metal, Flow Area= 0.79 sf
#2 Device 1 102.00' 18.0" Horiz. 18"CMP Riser C=0.600
Limited to weir flow at low heads
#3 Device 1 100.00' 0.230 cfs 4"Skimmer
#4 Primary 103.00' 10'Secondary Spillway, C=3.27
Offset(feet) 0.00 4.50 14.50 19.50
Height(feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=37.70 cfs @ 12.41 hrs HW=103.88' (Free Discharge)
1=12"CMP Barrel (Barrel Controls 4.75 cfs @ 6.05 fps)
"L218"CMP Riser (Passes < 11.66 cfs potential flow)
3=4"Skimmer (Passes < 0.23 cfs potential flow)
4=10' Secondary Spillway (Weir Controls 32.95 cfs @ 2.41 fps)

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