SW3170702_COMPLIANCE_20170901

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. SW���(%%�
DOC TYPE ❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

Patterson, Robert D
From: Patterson, Robert D
Sent: Thursday, July 20, 2017 1:58 PM
To: [e-mail]'
Cc: [e-mail]'
Subject: FW: Harkey Creek Subdivision application
Andrew— I forgot to copy you on my email below to your engineer, Jeff. Thanks.
From: Patterson, Robert D
Sent: Thursday, July 20, 2017 1:55 PM
To: Jschmitt@ken neydesign.com' <jschmitt@ken neydesign.com>
Subject: Harkey Creek Subdivision application
Jeff —Pleasure speaking with you today. As a follow-up, we cannot accept the application as submitted for the following
reasons. I will hold it for a week if you can get the corrected info to me in that time. This will be returned as incomplete
if not received by July 31, 2017.
1. The applicant must sign the actual signature page of the forms (SWU-101 and 0&M Agreement); and submit the
originals. There is nothing associating those separate signature pages to each form we received.
2. Please submit the completed Supplement EZ form for the SCMs: https://deg.nc.gov/about/divisions/energy-
mineral-land-resources/energy-mineral-land-permit-guidance/stormwater-bmp-manua I
Please also submit pdfs of all submitted documents (email, ftp, cd, or flash drive). Let me know if you have any
questions or need additional time.
Thanks.
Robert D. Patterson, P.E.
Environmental Engineer
919-807-6369 1 Robert.Patterson Cdncdenr.gov
https://deg.nc.gov/about/divisions/energy-minera I-land-resources/stormwater
NC Dept. of Environmental Quality
DEMLR Stormwater Program
512 N. Salisbury St.
1612 Mail Service Center
Raleigh, NC 27699-1612
Email correspondence to and from this address is subject to the North Carolina Public Records Low and may be disclosed to third parties.

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Kenney
Design Group, PAEy
1216 Parsons Trail
Denver, NC 28037r9;;
i
[phone]
Project: Harkey Creek
1 of 1 Date:
611/17
Designed By:
milk
Project No.
0416
FES:
OS-1
APRON LENGTH, La=
8.00
ft.
PIPE CIA
24
in.
APRON WIDTH (BOTTOM), Wa=
6.0
ft.
FLOW
14.70
cfs
APRON WIDTH (TOP), Wa=
10.00
ft.
TAILWATER DEPTH
0.4
ft.
d50 Stone Size=
3.00
in
FES:
OS-2 & 8
APRON LENGTH, La=
8.00
ft.
PIPE DIA
18
in.
APRON WIDTH (BOTTOM), Wa=
4.5
ft.
FLOW
1.10
cfs
APRON WIDTH (TOP), Wa=
9.50
ft.
TAILWATER DEPTH
0.3
ft.
d50 Stone Size=
3.00
in
FES:
OS-3
APRON LENGTH, La=
8.00
ft.
PIPE DIA
24
in.
APRON WIDTH (BOTTOM), Wa=
6.0
ft.
FLOW
12.80
cfs
APRON WIDTH (TOP), Wa=
10.00
ft.
TAILWATER DEPTH
0.4
ft.
d50 Stone Size=
3.00
in
FES:
OS-4
APRON LENGTH, La=
8.00
ft.
PIPE DIA
30
in.
APRON WIDTH (BOTTOM), We=
7.5
ft.
FLOW
22.40
cfs
APRON WIDTH (TOP), Wa=
10.50
ft.
TAILWATER DEPTH
0.5
ft.
d50 Stone Size=
6.00
in
FES:
OS-5
APRON LENGTH, La=
8.00
ft.
PIPE DIA
24
in.
APRON WIDTH (BOTTOM), We=
6.0
ft.
FLOW
8.80
cfs
APRON WIDTH (TOP), Wa=
10.00
ft.
TAILWATER DEPTH
0.4
ft.
d50 Stone Size=
3.00
in
FES:
OS-6
APRON LENGTH, La=
8.00
ft.
PIPE DIA
30
in.
APRON WIDTH (BOTTOM), Wa=
7.5
ft.
FLOW
16.40
cfs
APRON WIDTH (TOP), Wa=
10.50
ft.
TAILWATER DEPTH
0.5
ft.
d50 Stone Size=1
3.00
in
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WP-1 Type 1124-hr 10 yr, 24 hr Rainfall=4.80"
Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 8/23/2017
This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and
educational use only. For actual design or modeling applications you must use a full version of HydroCAD
which may be purchased at www.hydrocad.net. Full programs also include complete documentation,
technicalsupport, training materials, and additional features which are essential for actual design work.
Summary for Pond 4P: Wet Pond 3
Inflow Area =
3.870 ac,
Inflow Depth = 3.28"
for 10 yr, 24 hr event
Inflow =
22.06 cfs @
11.95 hrs, Volume=
1.058 of
Outflow =
14.74 cfs @
12.03 hrs, Volume=
1.056 af, Atten= 33%, Lag= 4.3 min
Primary =
14.74 cfs @
12.03 hrs, Volume=
1.056 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Starting Elev= 655.00' Surf.Area= 9,200 sf Storage= 27,045 cf
Peak Elev= 656.52' @ 12.03 hrs Surf.Area= 12,582 sf Storage= 44,482 cf (17,437 cf above start)
Plug -Flow detention time= 1,722.7 min calculated for 0.435 of (41% of inflow)
Center -of -Mass det. time= 637.1 min (1,439.0 - 802.0 )
Volume Invert
Avail.Storage Storage Description
#1 651.00'
96,939 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
651.00
3,490
0 0
652.00
5,900
4,695 4,695
654.00
7,900
13,800 18,495
655.00
9,200
8,550 27,045
656.00
11,800
10,500 37,545
658.00
14,798
26,598 64,143
660.00
17,998
32,796 96,939
Device Routing
Invert
Outlet Devices
#1 Primary
653.90'
24.0" Round Culvert
L= 30.0' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 653.90' / 653.60' S= 0.0100'/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
655.00'
1.5" Horiz. Orifice/Grate C= 0.600
#3 Device 1
656.00'
12.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
Primary OutFlow Max=14.34 cfs @ 12.03 hrs HW=656.51' (Free Discharge)
1-'1=Culvert (Passes 14.34 cis of 18.35 cis potential flow)
�2=Orifice/Grate (Orifice Controls 0.07 cfs @ 5.92 fps)
3=Sharp-Crested Rectangular Weir (Weir Controls 14.26 cis @ 2.34 fps)

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WP-2 Type 11 24-hr 10 yr, 24 hr Rainfall=4.80"
Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 8/23/2017
HydrOCA0010.00-16 Sampler s/n S01551 02015 HydroCAD Software Solutions LLC
This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and
educational use only. For actual design or modeling applications you must use a full version of HydroCAD
which may be purchased at www.hydrocad.net. Full programs also include complete documentation,
technicalsupport, training materials, and additional features which are essential for actual design work.
Summary for Pond 4P: Wet Pond 3
Inflow Area =
3.590 ac,
Inflow Depth = 3.28"
for 10 yr, 24 hr event
Inflow =
20.93 cfs @
11.96 hrs, Volume=
0.982 of
Outflow =
0.79 cis @
13.45 hrs, Volume=
0.871 af, Atten= 96%, Lag= 89.4 min
Primary =
0.79 cfs @
13.45 hrs, Volume=
0.871 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Peak Elev= 643.14' @ 13.45 hrs Surf.Area= 15,085 sf Storage= 28,260 cf
Plug -Flow detention time= 1,957.7 min calculated for 0.871 of (89% of inflow)
Center -of -Mass det. time= 1,901.8 min ( 2,703.8 - 802.0 )
Volume Invert
Avail.Storage Storage Description
#1 641,00'
80,150 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
641.00
9,900
0 0
642.00
12,800
11,350 11,350
644.00
16,800
29,600 40,950
646.00
22,400
39,200 80,150
Device Routing
Invert
Outlet Devices
#1 Primary
640.50'
18.0" Round Culvert
L= 42.0' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 640.50' / 640.00' S= 0.0119 T Cc= 0.900
n= 0.012, Flow Area= 1.77 sf
#2 Device 1
641.00'
1.5" Horiz. Orifice/Grate C= 0.600
#3 Device 1
643.00'
4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
Primary OutFlow Max=0.79 cfs @ 13.45 hrs HW=643.14' (Free Discharge)
Culvert (Passes 0.79 cfs of 11.71 cfs potential flow)
2=Orifice/Grate (Orifice Controls 0.09 cfs @ 7.05 fps)
'I
-Crested Rectangular Weir (Weir Controls 0.70 cfs @ 1.23 fps)

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WP-3 Type 1124-hr 10 yr, 24 hr Rainfall=4.80"
Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 8/23/2017
HydroCAD® 10.00-16 Sampler s/n S01551 02015 HydroCAD Software Solutions LLC
This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and
educational use only. For actual design or modeling applications you must use a full version of HydroCAD
which may be purchased at www.hydrocad.net. Full programs also include complete documentation,
technicalsupport, training materials, and additional features which are essential for actual design work.
Summary for Pond 4P: Wet Pond 3
Inflow Area = 13.060 ac, Inflow Depth = 3.28" for 10 yr, 24 hr event
Inflow = 76.13 cfs @ 11.96 hrs, Volume= 3.571 of
Outflow = 12.78 cfs @ 12.13 hrs, Volume= 3.541 af, Atten= 83%, Lag= 10.2 min
Primary = 12.78 cfs @ 12.13 hrs, Volume= 3.541 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Starting Elev= 640.00' Surf.Area= 36,200 sf Storage= 104,875 cf
Peak Elev= 642.00' @ 12.13 hrs Surf.Area= 43,305 sf Storage= 184,434 cf (79,559 cf above start)
Plug -Flow detention time= 2,296.4 min calculated for 1.133 of (32% of inflow)
Center -of -Mass det. time= 739.0 min ( 1,540.9 - 802.0 )
Volume Invert Avail.Storage Storage Description
#1 636.50' 279,475 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
636.50 20,400 0 0
638.00 30,500 38,175 38,175
640.00 36,200 66,700 104,875
642.00 43,300 79,500 184,375
644.00 51,800 95,100 279,475
Device Routing Invert Outlet Devices
#1 Primary 640.00' 24.0" Round Culvert
L= 25.0' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 640.00' / 639.75' S= 0.0100 ? Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1 640.00' 3.0" Horiz. Orifice/Grate C= 0.600
#3 Device 1 641.00' 4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
#4 Secondary 642.50' 20.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
Primary OutFlow Max=12.77 cfs @ 12.13 hrs HW=642.00' (Free Discharge)
Culvert (Passes 12.77 cfs of 13.45 cfs potential flow)
2=Orifice/Grate (Orifice Controls 0.33 cfs @ 6.81 fps)
'I
-Crested Rectangular Weir (Weir Controls 12.44 cfs @ 3.27 fps)
econdary OutFlow Max=0.00 cfs @ 0.00 hrs HW=640.00' (Free Discharge)
Sharp -Crested Rectangular Weir ( Controls 0.00 cfs)

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WP-4 Type 1124-hr 10 yr, 24 hr Rainfall=4.80"
Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 8/23/2017
This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and
educational use only. For actual design or modeling applications you must use a full version of HydroCAD
which may be purchased at www.hydrocad.net. Full programs also include complete documentation,
technicalsupport, training materials, and additional features which are essential for actual design work.
Summary for Pond 4P: Wet Pond 3
Inflow Area = 10.550 ac, Inflow Depth = 3.09" for 10 yr, 24 hr event
Inflow =
58.57 cfs @
11.96 hrs,
Volume=
2.715 of
Outflow =
22.37 cfs @
12.06 hrs,
Volume=
2.712 af, Atten= 62%, Lag= 6.1 min
Primary =
22.37 cfs @
12.06 hrs,
Volume=
2.712 of
Secondary =
0.00 cfs @
0.00 hrs,
Volume=
0.000 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Starting Elev= 632.00' Surf.Area= 10,770 sf Storage= 31,566 cf
Peak Elev= 635.10' @ 12.06 hrs Surf.Area= 20,729 sf Storage= 82,389 cf (50,823 cf above start)
Plug -Flow detention time= 874.0 min calculated for 1.988 of (73% of inflow)
Center -of -Mass det. time= 549.6 min ( 1,357.7 - 808.2 )
Volume Invert Avail.Storage Storage Description
#1 628.00' 125,686 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
628.00 4,918 0 0
630.00 7,939 12,857 12,857
632.00 10,770 18,709 31,566
634.00 17,600 28,370 59,936
636.00 23,300 40,900 100,836
637.00 26,200 24,750 125,586
Device Routing Invert Outlet Devices
#1 Primary 631.00' 30.0" Round Culvert
L= 50.0' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert-- 631.00' / 630.00' S= 0.0200 'f Cc= 0.900
n= 0.012, Flow Area= 4.91 sf
#2 Device 1 632.00' 2.0" Horiz. Orifice/Grate C= 0.600
#3 Device 1 633.60' 4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
#4 Device 1 635.70' 12.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
#5 Secondary 635.70' 20.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
Primary OutFlow Max=22.35 cfs @ 12.06 hrs HW=635.10' (Free Discharge)
t =Culvert (Passes 22.35 cfs of 39.88 cfs potential flow)
2=Orifice/Grate (Orifice Controls 0.18 cfs @ 8.47 fps)
3=Sharp-Crested Rectangular Weir (Weir Controls 22.17 cfs @ 4.00 fps)
=Sharp -Crested Rectangular Weir ( Controls 0.00 cfs)
econdary OutFlow Max=0.00 cfs @ 0.00 hrs HW=632.00' (Free Discharge)
=Sharp -Crested Rectangular Weir ( Controls 0.00 cfs)

WP-5 Type II 24-hr 10 yr, 24 hr Rainfall=4.80"
Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 8/23/2017
This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and
educational use only. For actual design or modeling applications you must use a full version of HydroCAD
which may be purchased at www.hydrocad.net. Full programs also include complete documentation,
technicalsupport, training materials, and additional features which are essential for actual design work.
Summary for Pond 4P: Wet Pond 3
Inflow Area = 9.510 ac, Inflow Depth = 2.90" for 10 yr, 24 hr event
Inflow =
50.08 cfs @
11.96 hrs,
Volume=
2.299 of
Outflow =
8.81 cfs @
12.13 hrs,
Volume=
2.227 af, Atten= 82%, Lag= 10.0 min
Primary =
8.81 cfs @
12.13 hrs,
Volume=
2.227 of
Secondary =
0.00 cfs @
0.00 hrs,
Volume=
0.000 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Starting Elev= 624.00' Surf.Area= 18,800 sf Storage= 59,900 of
Peak Elev= 626.18' @ 12.13 hrs Surf.Area= 25,631 sf Storage= 108,856 cf (48,956 cf above start)
Plug -Flow detention time= 2,565.3 min calculated for 0.851 of (37% of inflow)
Center -of -Mass det. time= 956.1 min ( 1,770.1 - 814.0 )
Volume Invert Avail.Storage Storage Description
#1 620.00' 159,100 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
620.00 10,100 0 0
622.00 15,500 25,600 25,600
624.00 18,800 34,300 59,900
626.00 25,200 44,000 103,900
628.00 30,000 55,200 159,100
Device Routing Invert Outlet Devices
#1 Primary 623.00' 24.0" Round Culvert
L= 50.0' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 623.00' / 622.00' S= 0.0200 'P Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1 624.09 2.0" Horiz. Orifice/Grate C= 0.600
#3 Device 1 625.40' 4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
#4 Device 1 626.70' 12.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
#5 Secondary 626.70' 20.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
Primary OutFlow Max=8.80 cfs @ 12.13 hrs HW=626.18' (Free Discharge)
=Culvert (Passes 8.80 cfs of 22.33 cfs potential flow)
2=Orifice/Grate (Orifice Controls 0.16 cfs @ 7.11 fps)
3=Sharp-Crested Rectangular Weir (Weir Controls 8.65 cfs @ 2.89 fps)
=Sharp -Crested Rectangular Weir ( Controls 0.00 cfs)
econdary OutFlow Max=0.00 cfs @ 0.00 hrs HW=624.00' (Free Discharge)
=Sharp -Crested Rectangular Weir ( Controls 0.00 cfs)

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WP.7 Type // 24-hr 10 yr, 24 hr Rainfall=4.80"
Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 8/23/2017
HydroCAD010.00-16 Sampler s/n S01551 02015 HydroCAD Software Solutions LLC
This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and
educational use only. For actual design or modeling applications you must use a full version of HydroCAD
which may be purchased at www.hydrocad.net. Full programs also include complete documentation,
technicalsupport, training materials, and additional features which are essential for actual design work.
Summary for Pond 4P: Wet Pond 3
Inflow Area =
10.650 ac,
Inflow Depth = 3.18"
for 10 yr, 24 hr event
Inflow =
60.62 cfs @
11.96 hrs, Volume=
2.826 of
Outflow =
16.35 cfs @
12.08 hrs, Volume=
2.824 af, Atten= 73%, Lag= 7.5 min
Primary =
16.35 cis @
12.08 hrs, Volume=
2.824 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt-- 0.02 hrs
Starting Elev= 646.00' Surf.Area= 20,200 sf Storage= 62,700 cf
Peak Elev= 648.20' @ 12.08 hrs Surf.Area= 29,772 sf Storage= 120,127 cf (57,427 cf above start)
Plug -Flow detention time= 1,216.5 min calculated for 1.385 of (49% of inflow)
Center -of -Mass det. time= 518.2 min ( 1,323.3 - 805.1 )
Volume Invert
Avail.Storage Storage Description
#1 642.00'
178,000 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
642.00
10,700
0 0
644.00
15,900
26,600 26,600
646.00
20,200
36,100 62,700
647.00
26,400
23,300 86,000
648.00
29,200
27,800 113,800
650.00
35,000
64,200 178,000
Device Routing
Invert
Outlet Devices
#1 Primary
642.00'
30.0" Round Culvert
L= 32.0' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 642.00' / 641.70' S= 0.0094'f Cc= 0.900
n= 0.012, Flow Area= 4.91 sf
#2 Device 1
646.00'
2.5" Horiz. Orifice/Grate C= 0.600
#3 Device 1
647.00'
4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
#4 Device 1
648.40'
12.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
Primary OutFlow Max=16.33 cfs @ 12.08 hrs HW=648.20' (Free Discharge)
=Culvert (Passes 16.33 cis of 52.57 cfs potential flow)
2=Orifice/Grate (Orifice Controls 0.24 cfs @ 7.14 fps)
3=Sharp-Crested Rectangular Weir (Weir Controls 16.09 cfs @ 3.58 fps)
-Sharp-Crested Rectangular Weir ( Controls 0.00 cis)

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WP_8 Type // 24-hr 10 yr, 24 hr Rainfall=4.80"
Prepared by HydroCAD SAMPLER 1-800-927-7246 www.hydrocad.net Printed 8/23/2017
This report was prepared with the free HydroCAD SAMPLER, which is licensed for evaluation and
educational use only. For actual design or modeling applications you must use a full version of HydroCAD
which may be purchased at www.hydrocad.net. Full programs also include complete documentation,
technicalsupport, training materials, and additional features which are essential for actual design work.
Summary for Pond 4P: Wet Pond 3
Inflow Area =
2.210 ac,
Inflow Depth = 2.90"
for 10 yr, 24 hr event
Inflow =
11.64 cis @
11.96 hrs, Volume=
0.534 of
Outflow =
1.06 cfs @
12.43 hrs, Volume=
0.477 af, Atten= 91%, Lag= 28.1 min
Primary =
1.06 cfs @
12.43 hrs, Volume=
0.477 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Starting Elev= 641.00' Surf.Area= 5,271 sf Storage= 15,286 cf
Peak Elev= 642.68' @ 12.43 hrs Surf.Area= 8,656 sf Storage= 27,985 cf (12,700 cf above start)
Plug -Flow detention time= 4,324.8 min calculated for 0.126 of (24% of inflow)
Center -of -Mass det. time= 1,403.8 min ( 2,217.8 - 814.0 )
Volume Invert
Avail.Storage Storage Description
#1 636.00'
64,171 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
636.00
1,000
0 0
638.00
2,600
3,600 3,600
640.00
4,300
6,900 10,500
641.00
5,271
4,786 15,286
642.00
7,700
6,486 21,771
644.00
10,500
18,200 39,971
646.00
13,700
24,200 64,171
_Device Routing
Invert
Outlet Devices
#1 Primary
640.20'
18.0" Round Culvert
L= 40.0' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 640.20' / 640.00' S= 0.0050 'P Cc= 0.900
n= 0.012, Flow Area= 1.77 sf
#2 Device 1
641.00'
1.0" Horiz. Orifice/Grate C= 0.600
#3 Device 1
642.50'
4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
#4 Device 1
643.00'
12.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
Primary OutFlow Max=1.05 cfs @ 12.43 hrs HW=642.68' (Free Discharge)
LE=Culvert (Passes 1.05 cfs of 10.58 cfs potential flow)
=Orifice/Grate (Orifice Controls 0.03 cfs @ 6.25 fps)
=Sharp -Crested Rectangular Weir (Weir Controls 1.01 cfs @ 1.40 fps)
=Sharp -Crested Rectangular Weir ( Controls 0.00 cfs)