20240729_Sediment_Basin_Calculations

C2�
ENGINEERING & ENVIRONMENTAL SCIENCE COMPANY
3008 ANDERSON DRIVE.SUITE 102
RALEIGH.NG 27W9
[phone]
July 26, 2024
Mr. Hunter Stone
H& S Land,LLC
3204 Nash St.,North, Suite C
Wilson,NC 27896
RE: Erosion Control Evaluation
Dunnie Hole Mine
NC HWY 222
Stantonsburg,NC
Dear Mr. Stone:
Attached are the calculations for the sizing of the six (6) sediment basins. The basin surface area
was based on the 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 is likely that no stormwater discharge will occur.
Approximately 0.1 cubic yards of concrete will be needed for anchoring the riser pipe.
Please contact me if you have any questions.
Sincerely,
T. Patrick Shillingto E .•'Q �Ny<9
President SUL
15472 �7`i yI If
Attachments s',o•.

(is v 1P
Watershed #1 Basin #1
Subcat Reach on Link Routing Diagram for Basin#1
Prepared by E2S
FydroCAD®10.00-26 sln 07329 ©2020 HydroCAD Software Solutions LLC

L i
Basin #1 Type U 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 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 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

a
Basin #1 Type 1124-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 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 = 0.11 cfs @ 10.70 hrs, Volume= 1.003 af, Atten=99%, Lag=0.0 min
Primary = 0.11 cfs @ 10.70 hrs, Volume= 1.003 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 101.61' @ 25.60 hrs Surf.Area= 143,239 sf Storage= 142,181 cf
Plug-Flow detention time= 3,159.8 min calculated for 1.002 of(29% of inflow)
Center-of-Mass det. time=3,016.1 min ( 3,892.9-876.9 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 396,778 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
100.00 15,138 0 0
101.00 103,237 59,188 59,188
102.00 168,795 136,016 195,204
103.00 234,353 201,574 396,778
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 102.50' 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=0.11 cfs @ 10.70 hrs HW=100.04' (Free Discharge)
A kb
1=12" CMP Barrel (Passes 0.11 cfs of 1.82 cfs potential flow)
TE2=18" CMP Riser ( Controls 0.00 cfs)
3=3" Skimmer (Constant Controls 0.11 cfs)
4=10' Secondary Spillway ( Controls 0.00 cfs)

s
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 4
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, 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
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

is
Basin #1 Type 1124-hr 10 yr Rainfall=5.56"
Prepared by E2S
HydroCAD®10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page5
Summary for Pond 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 = 1.29 cfs @ 21.52 hrs, Volume= 2.388 af, Atten= 96%, Lag=525.4 min
Primary = 1.29 cfs @ 21.52 hrs, Volume= 2.388 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 102.18' @ 21.52 hrs Surf.Area= 180,555 sf Storage=231,363 cf
Plug-Flow detention time= 1,771.4 min calculated for 2.387 of(38% of inflow)
Center-of-Mass det. time= 1,637.2 min ( 2,496.8-859.7 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 396,778 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
100.00 15,138 0 0
101.00 103,237 59,188 59,188
102.00 168,795 136,016 195,204
103.00 234,353 201,574 396,778
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 102.50' 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=1.28 cfs @ 21.52 hrs HW=102.18' (Free Discharge)
1=12"CMP Barrel (Passes 1.28 cfs of 3.72 cfs potential flow)
T__1
=18"CMP Riser (Weir Controls 1.17 cfs @ 1.38 fps)
3=3"Skimmer (Constant Controls 0.11 cfs)
4=10' Secondary Spillway ( Controls 0.00 cfs)

Basin #1 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 IS: Watershed #1
Runoff = 45.74 cfs @ 12.76 hrs, Volume= 8.331 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
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& Until led Kv= 10.0 fps
73.1 1,755 Total

Basin #1 Type 1124-hr 25 yr Rainfall=6.95"
Prepared by E2S
HydroCADO 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 7
Summary for Pond 1 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 = 3.47 cfs @ 16.48 hrs, Volume= 4.441 af, Atten= 92%, Lag= 223.2 min
Primary = 3.47 cfs @ 16.48 hrs, Volume= 4.441 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt=0.05 hrs
Peak Elev= 102.36' @ 16.48 hrs Surf.Area= 192,606 sf Storage=268,416 cf
Plug-Flow detention time= 1,167.6 min calculated for 4.441 of(53% of inflow)
Center-of-Mass det. time= 1,049.2 min ( 1,900.8-851.6 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 396,778 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet
100.00 15,138 0 0
101.00 103,237 59,188 59,188
102.00 168,795 136,016 195,204
103.00 234,353 201,574 396,778
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 102.50' 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=3.48 cfs @ 16.48 hrs HW=102.36' (Free Discharge)
1=12"CMP Barrel (Passes 3.48 cfs of 3.84 cfs potential flow)
t2=18"CMP Riser (Weir Controls 3.37 cfs @ 1.97 fps)
3=3"Skimmer (Constant Controls 0.11 cfs)
-10' Secondary Spillway ( Controls 0.00 cfs)

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

a a
Basin #2 Type //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 2S: Watershed #2
Runoff = 7.87 cfs @ 13.30 hrs, Volume= 1.960 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
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

's a
Basin #2 Type/1 24-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 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 = 0.11 cfs @ 12.05 hrs, Volume= 0.991 af, Atten=99%, Lag= 0.0 min
Primary = 0.11 cfs @ 12.05 hrs, Volume= 0.991 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 101.02' @ 26.04 hrs Surf.Area= 142,899 sf Storage= 79,137 cf
Plug-Flow detention time= 3,146.6 min calculated for 0.991 of(51% of inflow)
Center-of-Mass det. time= 3,017.5 min ( 3,930.1 -912.5 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 680,624 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
101.00 138,956 73,834 73,834
102.00 303,395 221,176 295,010
103.00 467,834 385,615 680,624
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 102.50' 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=0.11 cfs @ 12.05 hrs HW=100.04' (Free Discharge)
1=12" CMP Barrel (Passes 0.11 cfs of 1.82 cfs potential flow)
12=18" CMP Riser ( Controls 0.00 cfs)
3=3"Skimmer (Constant Controls 0.11 cfs)
4=10' Secondary Spillway ( Controls 0.00 cfs)

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 II 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 & Untilled Kv= 10.0 fps
112.1 1,986 Total

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 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 = 0.11 cfs @ 10.20 hrs, Volume= 1.010 af, Atten= 99%, Lag=0.0 min
Primary = 0.11 cfs @ 10.20 hrs, Volume= 1.010 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 101.34' @ 26.42 hrs Surf.Area= 195,066 sf Storage= 149,303 cf
Plug-Flow detention time= 3,133.9 min calculated for 1.010 of(28% of inflow)
Center-of-Mass det. time= 2,972.3 min ( 3,867.7-895.4)
Volume Invert Avail.Storage Storage Description
#1 100.00, 680,624 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
101.00 138,956 73,834 73,834
102.00 303,395 221,176 295,010
103.00 467,834 385,615 680,624
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 102.50' 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=0.11 cfs @ 10.20 hrs HW=100.04' (Free Discharge)
1=12"CMP Barrel (Passes 0.11 cfs of 1.82 cfs potential flow)
JL2=18"CMP Riser ( Controls 0.00 cfs)
3=3" Skimmer (Constant Controls 0.11 cfs)
4=10'Secondary Spillway ( Controls 0.00 cfs)

Basin #2 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 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

� 4
Basin #2 Type 1124-hr 25 yr Rainfall=6.95"
Prepared by E2S
HydroCADO 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 7
Summary for Pond 2P: 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 = 0.11 cfs @ 9.05 hrs, Volume= 1.020 af, Atten= 99%, Lag= 0.0 min
Primary = 0.11 cfs @ 9.05 hrs, Volume= 1.020 of
Routing by Stor-Ind method, Time Span=0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 101.57' @ 26.60 hrs Surf.Area= 233,313 sf Storage=200,747 cf
Plug-Flow detention time= 3,132.8 min calculated for 1.020 of(21% of inflow)
Center-of-Mass det. time= 2,947.8 min ( 3,835.2-887.3 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 680,624 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
101.00 138,956 73,834 73,834
102.00 303,395 221,176 295,010
103.00 467,834 385,615 680,624
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 102.50' 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=0.11 cfs @ 9.05 hrs HW=100.04' (Free Discharge)
1=12" CMP Barrel (Passes 0.11 cfs of 1.82 cfs potential flow)
t:218" CMP Riser ( Controls 0.00 cfs)
3=3"Skimmer (Constant Controls 0.11 cfs)
4=10'Secondary Spillway ( Controls 0.00 cfs)

(3S v 3P�
Watershed #3 Basin #3
Subcat Reach on Link Routing Diagram for Basin#3
Prepared by E2S
FHydroCADO 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC

Basin #3 Type 11 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 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

s
Basin #3 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 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 = 0.23 cfs @ 10.65 hrs, Volume= 2.097 af, Atten= 99%, Lag= 0.0 min
Primary = 0.23 cfs @ 10.65 hrs, Volume= 2.097 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 101.76' @ 25.72 hrs Surf.Area= 234,085 sf Storage=212,420 cf
Plug-Flow detention time= 3,137.9 min calculated for 2.096 of(40% of inflow)
Center-of-Mass det. time= 3,003.0 min ( 3,892.4-889.3 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 613,011 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
101.00 109,336 66,768 66,768
102.00 273,121 191,229 257,997
103.00 436,907 355,014 613,011
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 102.50' 25'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=0.23 cfs @ 10.65 hrs HW=100.04' (Free Discharge)
1=12"CMP Barrel (Passes 0.23 cfs of 1.82 cfs potential flow)
L2=1 8"CMP Riser ( Controls 0.00 cfs)
3=4"Skimmer (Constant Controls 0.23 cfs)
=25' Secondary Spillway ( Controls 0.00 cfs)

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 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) (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

Basin #3 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 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 = 2.02 cfs @ 21.38 hrs, Volume= 4.703 af, Atten= 96%, Lag=505.3 min
Primary = 2.02 cfs @ 21.38 hrs, Volume= 4.703 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 102.24' @ 21.38 hrs Surf.Area= 312,136 sf Storage= 342,564 cf
Plug-Flow detention time= 1,859.1 min calculated for 4.701 of(49% of inflow)
Center-of-Mass det. time= 1,735.8 min ( 2,608.0-872.1 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 613,011 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
101.00 109,336 66,768 66,768
102.00 273,121 191,229 257,997
103.00 436,907 355,014 613,011
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 102.50' 25'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=2.02 cfs @ 21.38 hrs HW=102.24' (Free Discharge)
1=12"CMP Barrel (Passes 2.02 cfs of 3.76 cfs potential flow)
T--2=18"CMP Riser (Weir Controls 1.79 cfs @ 1.60 fps)
3=4"Skimmer (Constant Controls 0.23 cfs)
4=25' Secondary Spillway ( Controls 0.00 cfs)

Basin #3 Type li 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 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) (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

Basin #3 Type 1124-hr 25 yr Rainfall=6.95"
Prepared by E2S
HydroCADO 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 7
Summary for Pond 3P: 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 = 3.90 cfs @ 18.45 hrs, Volume= 7.765 af, Atten= 94%, Lag= 329.9 min
Primary = 3.90 cfs @ 18.45 hrs, Volume= 7.765 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 102.45' @ 18.45 hrs Surf.Area= 346,865 sf Storage=417,839 cf
Plug-Flow detention time= 1,388.0 min calculated for 7.762 of(61% of inflow)
Center-of-Mass det. time= 1,279.4 min ( 2,143.5-864.1 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 613,011 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
101.00 109,336 66,768 66,768
102.00 273,121 191,229 257,997
103.00 436,907 355,014 613,011
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 102.50' 25'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=3.90 cfs @ 18.45 hrs HW=102.45' (Free Discharge)
1=12"CMP Barrel (Barrel Controls 3.90 cfs @ 4.97 fps)
I2=1 8"CMP Riser (Passes < 4.66 cfs potential flow)
=4"Skimmer (Passes < 0.23 cfs potential flow)
4=25' Secondary Spillway ( Controls 0.00 cfs)

4S ---�
i) 4 P
Watershed #4 Basin #4
SubCat Reach on Link Routing Diagram for Basin#4
Prepared by E2S
HydroCAD a010.00-26 sln 07329 ©2020 HydroCAD Software Solutions LLC

Basin #4 Type 1124-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 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 II 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) (fUft) (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

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
Inflow 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 = 0.07 cfs @ 10.15 hrs, Volume= 0.660 af, Atten= 100%, Lag= 0.0 min
Primary = 0.07 cfs @ 10.15 hrs, Volume= 0.660 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt=0.05 hrs
Peak Elev= 101.38' @ 24.51 hrs Surf.Area= 85,739 sf Storage= 67,146 cf
Plug-Flow detention time=3,165.7 min calculated for 0.659 of(40% of inflow)
Center-of-Mass det. time=3,043.3 min ( 3,876.0-832.7 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 336,840 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 44,867 29,830 29,830
102.00 153,505 99,186 129,016
103.00 262,144 207,825 336,840
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' 0.072 cfs 2.5"Skimmer
#4 Primary 102.50' 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=0.07 cfs @ 10.15 hrs HW=100.04' (Free Discharge)
1=12"CMP Barrel (Passes 0.07 cfs of 1.82 cfs potential flow)
N
=18" CMP Riser ( Controls 0.00 cfs)
2.5 Skimmer (Constant Controls 0.07 cfs)
4=10' Secondary Spillway ( Controls 0.00 cfs)

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 4
Summary for Subcatchment 4S: Watershed #4
Runoff = 33.94 cfs @ 12.19 hrs, Volume= 2.995 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
9.000 86 Newly graded area, HSG B
9.000 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ftlft) (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 & Unti lied Kv= 10.0 fps
25.6 951 Total

Basin #4 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 Pond 4P: 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 = 0.07 cfs @ 8.00 hrs, Volume= 0.673 af, Atten= 100%, Lag= 0.0 min
Primary = 0.07 cfs @ 8.00 hrs, Volume= 0.673 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 101.97' @ 24.59 hrs Surf.Area= 150,026 sf Storage= 125,839 cf
Plug-Flow detention time= 3,148.0 min calculated for 0.672 of(22% of inflow)
Center-of-Mass det. time=2,995.1 min ( 3,810.7-815.5 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 336,840 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 44,867 29,830 29,830
102.00 153,505 99,186 129,016
103.00 262,144 207,825 336,840
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' 0.072 cfs 2.5"Skimmer
#4 Primary 102.50' 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=0.07 cfs @ 8.00 hrs HW=100.04' (Free Discharge)
1=12"CMP Barrel (Passes 0.07 cfs of 1.82 cfs potential flow)
t2=1 8"CMP Riser ( Controls 0.00 cfs)
3 2.5 Skimmer (Constant Controls 0.07 cfs)
-10' Secondary Spillway ( Controls 0.00 cfs)

Basin #4 Type //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 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 II 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 fps
25.6 951 Total

Basin #4 Type 1l 24-hr 25 yr Rainfall=6.95"
Prepared by E2S
HydroCADO 10.00-26 s/n 07329 ©2020 HydroCAD 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 = 0.67 cfs @ 24.09 hrs, Volume= 1.416 af, Atten= 99%, Lag= 714.3 min
Primary = 0.67 cfs @ 24.09 hrs, Volume= 1.416 of
Routing by Stor-Ind method, Time Span=0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 102.11' @ 24.09 hrs Surf.Area= 165,871 sf Storage= 152,671 cf
Plug-Flow detention time= 1,943.5 min calculated for 1.415 of(35% of inflow)
Center-of-Mass det. time= 1,812.5 min (2,620.0-807.5 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 336,840 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 44,867 29,830 29,830
102.00 153,505 99,186 129,016
103.00 262,144 207,825 336,840
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' 0.072 cfs 2.5" Skimmer
#4 Primary 102.50' 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=0.66 cfs @ 24.09 hrs HW=102.11' (Free Discharge)
1=12"CMP Barrel (Passes 0.66 cfs of 3.67 cfs potential flow)
1:2=18"CMP Riser (Weir Controls 0.59 cfs @ 1.10 fps)
3 2.5 Skimmer (Constant Controls 0.07 cfs)
4=10'Secondary Spillway ( Controls 0.00 cfs)

5S 5P
Watershed #5 Basin #5
Subcat Reach On Link Routing Diagram for Basin#5
Prepared by E2S
FHydroCAD(D 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC

Basin #5 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 5S: Watershed #5
Runoff = 15.57 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) (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 fps
25.2 573 Total

Basin #5 Type //24-hr 2 yr Rainfaii=3.59"
Prepared by E2S
HydroCAD®10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 3
Summary for Pond 5P: 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 = 0.11 cfs @ 10.20 hrs, Volume= 1.008 af, Atten=99%, Lag=0.0 min
Primary = 0.11 cfs @ 10.20 hrs, Volume= 1.008 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 101.59' @ 24.39 hrs Surf.Area= 58,213 sf Storage= 52,416 cf
Plug-Flow detention time= 3,134.9 min calculated for 1.007 of(75% of inflow)
Center-of-Mass det. time= 3,043.4 min ( 3,875.7-832.4)
Volume Invert Avail.Storage Storage Description
#1 100.00, 178,463 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 28,750 20,775 20,775
102.00 78,844 53,797 74,572
103.00 128,938 103,891 178,463
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 102.50' 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=0.11 cfs @ 10.20 hrs HW=100.04' (Free Discharge)
1=12"CMP Barrel (Passes 0.11 cfs of 1.82 cfs potential flow)
t2=1 8"CMP Riser ( Controls 0.00 cfs)
3=3"Skimmer (Constant Controls 0.11 cfs)
4=10' Secondary Spillway ( Controls 0.00 cfs)

Basin #5 Type //24-hr 90 yr Rainfall=5.56"
Prepared by E2S
HydroCAD®10.00-26 s/n 07329 @ 2020 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 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 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 fps
25.2 573 Total

9 t• a
Basin #5 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 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 = 0.65 cfs @ 18.89 hrs, Volume= 1.519 af, Atten=98%, Lag=402.9 min
Primary = 0.65 cfs @ 18.89 hrs, Volume= 1.519 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 102.11' @ 18.89 hrs Surf.Area= 84,168 sf Storage= 85,614 cf
Plug-Flow detention time=2,279.0 min calculated for 1.519 of(62%of inflow)
Center-of-Mass det. time=2,175.4 min ( 2,990.6-815.1 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 178,463 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 28,750 20,775 20,775
102.00 78,844 53,797 74,572
103.00 128,938 103,891 178,463
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 102.50' 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=0.64 cfs @ 18.89 hrs HW=102.11' (Free Discharge)
1=12"CMP Barrel (Passes 0.64 cfs of 3.67 cfs potential flow)
T__2=18"CMP Riser (Weir Controls 0.53 cfs @ 1.07 fps)
3=3" Skimmer (Constant Controls 0.11 cfs)
4=10' Secondary Spillway ( Controls 0.00 cfs)

Basin #5 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 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, 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
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 fps
25.2 573 Total

9 ry a
Basin #5 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 7
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 = 1.81 cfs @ 14.49 hrs, Volume= 2.325 af, Atten= 95%, Lag= 138.8 min
Primary = 1.81 cfs @ 14.49 hrs, Volume= 2.325 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 102.23' @ 14.49 hrs Surf.Area= 90,332 sf Storage= 98,396 cf
Plug-Flow detention time= 1,598.6 min calculated for 2.324 of(71% of inflow)
Center-of-Mass det. time= 1,505.4 min ( 2,312.5-807.1 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 178,463 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 28,750 20,775 20,775
102.00 78,844 53,797 74,572
103.00 128,938 103,891 178,463
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 102.50' 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=1.80 cfs @ 14.49 hrs HW=102.23' (Free Discharge)
1=12"CMP Barrel (Passes 1.80 cfs of 3.75 cfs potential flow)
12=18"CMP Riser (Weir Controls 1.69 cfs @ 1.57 fps)
3=3" Skimmer (Constant Controls 0.11 cfs)
=10' Secondary Spillway ( Controls 0.00 cfs)

6S 6P
Watershed #6 Basin #6
Subcat Reach on Link Routing Diagram for Basin#6
Prepared by E2S
FHyd,,CAD(D 10.00-26 sln 07329 ©2020 HydroCAD Software Solutions LLC

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 2
Summary for Subcatchment 6S: Watershed #6
Runoff = 32.16 cfs @ 12.25 hrs, Volume= 3.158 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
17.400 86 Newly graded area, HSG B
17.400 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.7 100 0.0050 0.25 Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.59"
24.3 1,033 0.0050 0.71 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Untilled Kv= 10.0 fps
31.0 1,133 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 6P: Basin #6
Inflow Area = 17.400 ac, 0.00% Impervious, Inflow Depth = 2.18" for 2 yr event
Inflow = 32.16 cfs @ 12.25 hrs, Volume= 3.158 of
Outflow = 0.11 cfs @ 9.95 hrs, Volume= 1.009 af, Atten= 100%, Lag=0.0 min
Primary = 0.11 cfs @ 9.95 hrs, Volume= 1.009 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt=0.05 hrs
Peak Elev= 101.86' @ 24.66 hrs Surf.Area= 126,610 sf Storage= 131,317 cf
Plug-Flow detention time= 3,164.9 min calculated for 1.008 of(32% of inflow)
Center-of-Mass det. time=3,034.4 min ( 3,872.1 -837.7 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 321,016 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
100.00 31,320 0 0
101.00 60,984 46,152 46,152
102.00 137,432 99,208 145,360
103.00 213,879 175,656 321,016
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 102.50' 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=0.11 cfs @ 9.95 hrs HW=100.04' (Free Discharge)
=12"CMP Barrel (Passes 0.11 cfs of 1.82 cfs potential flow)
2=18"CMP Riser ( Controls 0.00 cfs)
3=3"Skimmer (Constant Controls 0.11 cfs)
4=10' Secondary Spillway ( Controls 0.00 cfs)

TP 4
Basin #6 Type/1 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 6S: Watershed #6
Runoff = 58.35 cfs @ 12.25 hrs, Volume= 5.789 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
17.400 86 Newly graded area, HSG B
17.400 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.7 100 0.0050 0.25 Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.59"
24.3 1,033 0.0050 0.71 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Untilled Kv= 10.0 fps
31.0 1,133 Total

Basin #6 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 6P: Basin #6
Inflow Area = 17.400 ac, 0.00% Impervious, Inflow Depth = 3.99" for 10 yr event
Inflow = 58.35 cfs @ 12.25 hrs, Volume= 5.789 of
Outflow = 2.06 cfs @ 16.69 hrs, Volume= 3.100 af, Atten= 96%, Lag=266.3 min
Primary = 2.06 cfs @ 16.69 hrs, Volume= 3.100 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 102.25' @ 16.69 hrs Surf.Area= 156,652 sf Storage= 189,522 cf
Plug-Flow detention time= 1,416.7 min calculated for 3.098 of(54% of inflow)
Center-of-Mass det. time= 1,306.3 min ( 2,126.8-820.5 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 321,016 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
100.00 31,320 0 0
101.00 60,984 46,152 46,152
102.00 137,432 99,208 145,360
103.00 213,879 175,656 321,016
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 102.50' 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=2.05 cfs @ 16.69 hrs HW=102.25' (Free Discharge)
F=1=12"CMP Barrel (Passes 2.05 cfs of 3.77 cfs potential flow)
2=18" CMP Riser (Weir Controls 1.94 cfs @ 1.64 fps)
3=3"Skimmer (Constant Controls 0.11 cfs)
-10' Secondary Spillway ( Controls 0.00 cfs)

6i T r Ot
Basin #6 Type Il 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 6S: Watershed #6
Runoff = 76.94 cfs @ 12.25 hrs, Volume= 7.711 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
17.400 86 Newly graded area, HSG B
17.400 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (fUft) (ft/sec) (cfs)
6.7 100 0.0050 0.25 Sheet Flow, Sheet
Fallow n= 0.050 P2= 3.59"
24.3 1,033 0.0050 0.71 Shallow Concentrated Flow, Shallow Concent.
Nearly Bare & Untilled Kv= 10.0 fps
31.0 1,133 Total

Basin #6 Type/1 24-hr 25 yr Rainfall=6.95"
Prepared by E2S
HydroCADO 10.00-26 s/n 07329 ©2020 HydroCAD Software Solutions LLC Page 7
Summary for Pond 6P: Basin #6
Inflow Area = 17.400 ac, 0.00% Impervious, Inflow Depth = 5.32" for 25 yr event
Inflow = 76.94 cfs @ 12.25 hrs, Volume= 7.711 of
Outflow - 3.93 cfs @ 14.93 hrs, Volume= 5.005 af, Atten= 95%, Lag= 160.8 min
Primary = 3.93 cfs @ 14.93 hrs, Volume= 5.005 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 102.49' @ 14.93 hrs Surf.Area= 175,136 sf Storage= 231,994 cf
Plug-Flow detention time= 1,032.4 min calculated for 5.005 of(65%of inflow)
Center-of-Mass det. time= 930.7 min ( 1,743.2 -812.5 )
Volume Invert Avail.Storage Storage Description
#1 100.00, 321,016 cf Custom Stage Data(Prismatic)Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
100.00 31,320 0 0
101.00 60,984 46,152 46,152
102.00 137,432 99,208 145,360
103.00 213,879 175,656 321,016
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 102.50' 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=3.93 cfs @ 14.93 hrs HW=102.49' (Free Discharge)
=12"CMP Barrel (Barrel Controls 3.93 cfs @ 5.00 fps)
2=18"CMP Riser (Passes < 5.34 cfs potential flow)
3=3"Skimmer (Passes < 0.11 cfs potential flow)
4=10' Secondary Spillway ( Controls 0.00 cfs)

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