SW5200701_Design Calculations_20220105

Famous Chicken,*n Biscuits
at Spring Hope, NC
Owner/Developer:
It's Farm Time, LLC
Contact: Brad Mercer
brad. mercer(cD-becaiun.com
252.208.2233
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"MEOW
SEAL.
ENGINEERING _ %84
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801 EAST WASHINGTON STREET P.O. BOX 1108 • •
•
NASHVILLE, N.C. 27856 PHONE: [phone] �i V .•
WWW.STOCKSENGINEERING.COM •••• ••

•
EENGINEERING
Wet Pond Design
Project: Bojangles Spring Hope
Location: Spring Hope, NC
Date: 19-Aug-20
Basin ID: 1
Drainage Area (A) 8.08 Acres
Impervious Area 3.47 Acres
% Impervious (1) 42.95%
Water Qualitv Volume
Calculate Rv: Rv = 0.05+.9 X I
Rv =1 0.44
WQV= 3630XRDXRvXA
R. = 1.00 Inch
WQV = 12,803 ICF
Surface Area
Orifice Sizing
Average Depth = 3.00
SA/DA Ratio = 1.60 (Choose SA/DA Ration from the NC BMP Maunual Table 1 or 2)
Surface Area = (SA/DA Ratio / 100) X Area (Ac.) / 43,560 (SF/Ac.)
5,631 SF
Design Orifice Q= CDAO 2gHo
CD = 0.6
g= 32.2 FT/S2
Ho = H/3= 0.67 FT
H= 2 FT
Ao = 0.01 FEET
Design Pipe = 1.3 INCH
Design Orifice Q = 0.04 CFS
Days to Drain =1 4.1
Wetland Plants - Vegetative Shelf
Vegetative Shelf SurfaceArea = 1919 SF
# of Wetland Plants = 480

WET DETENTION FOREBAY VOLUME COMPARISON
FOREBAY VOLUME
ELEVATION
SURFACE
AREA
INCREMENTAL
VOLUME
243.0
330.0
446.0
244.0
562.0
705.0
245.0
848.0
1,015.0
246.0
1,182.0
703.0
246.5
1,630.0
SUM = 2,869.0
Forebay is 16.9% of Pond.
Pond Average Depth: 3.1 Feet
POND VOLUME
ELEVATION
SURFACE
AREA
INCREMENTAL
VOLUME
240.5
1324
698.3
241
1469
1,624.5
242
1780
1,949.5
243.0
2,119.0
2,301.0
244.0
2,483.0
2,679.0
245.0
2,875.0
3,083.5
246.0
3,292.0
1,797.8
246.5
3,899.0
SUM = 14,133.5

•
RE-NGINEERING
Curve Numbers
Project: Bojangles At Spring Hope
Location: Spring Hope, NC
Date: 15-Oct-21
Pre Development
Curve Number
Pre Dev. 1 49.66
Post Development
Curve Number
Post Dev. 1
64.34
Post Dev. Bypass
39.00

l
r
ENGERING
Curve Numbers
Project:
Bojangles At Spring Hope
Location:
Spring Hope, NC
Date:
15-Oct-21
Basin ID:
Pre Dev. Area 1
Drainage Area (A) 1 8.95 Acres
Runoff Curve Numbers
Cover Description
Cover Type and Hydrologic Condition I A I Area (ac)J B I Area (ac)J C I Area (ac)J D I Area (ac)
Cultivated Land
Without Conservation Treatment
72
81
88
91
With Conservation Treatment
62
71
78
81
Wood of Forest Land
Poor Cover (Thin)
45
66
77
83
Good Cover
25
55
70
77
Open Spance (lawns, parks, cemeteries, etc)
Poor Condition
(grass cover <50%)
68
79
86
89
Fair Condition
(grass cover 50%-75%)
49
8.83
69
79
84
Good Condition
(grass cover >75%)
39
61
74
80
Impervious Area
Parking Lots, Roofs, Drives, etc.
1 98 1 0.12
1 98 1
1 98 1
1 98
Soil Area per Hydrologic Group
1 1 8.95
1 1 0
1 1 0
1 1 0
Drainage Area = Area Total
Weighted Curve Number
CN = [(CNi*Ai)+ (CNn*An)]/Atot
TRUE F 8.95
Pre Development Area 1 Curve Number 49.66

l
r
ENGERING
Curve Numbers
Project:
Bojangles At Spring Hope
Location:
Spring Hope, NC
Date:
15-Oct-21
Basin ID:
Post Dev. To SCM
Drainage Area (A) 1 8.08 Acres
Runoff Curve Numbers
Cover Description
Cover Type and Hydrologic Condition I A I Area (ac)J B I Area (ac)J C I Area (ac)J D I Area (ac)
Cultivated Land
Without Conservation Treatment
72
81
88
91
With Conservation Treatment
62
71
78
81
Wood of Forest Land
Poor Cover (Thin)
45
66
77
83
Good Cover
25
55
70
77
Open Spance (lawns, parks, cemeteries, etc)
Poor Condition
(grass cover <50%)
68
79
86
89
Fair Condition
(grass cover 50%-75%)
49
69
79
84
Good Condition
(grass cover >75%)
39
4.61
61
74
80
Impervious Area
Parking Lots, Roofs, Drives, etc.
1 98 1 3.47
1 98
98
98
Soil Area per Hydrologic Group
1 1 8.08
1 1 0
0
1 0
Drainage Area = Area Total
Weighted Curve Number
CN = [(CNi*Ai)+ (CNn*An)]/Atot
TRUE F 8.08
Post Development Area 1 Curve Number 64.34

l
r
ENGERING
Curve Numbers
Project:
Bojangles At Spring Hope
Location:
Spring Hope, NC
Date:
15-Oct-21
Basin ID:
Post Dev. Bypass
Drainage Area (A) 1 1.08 Acres
Runoff Curve Numbers
Cover Description
Cover Type and Hydrologic Condition I A I Area (ac)J B I Area (ac)J C I Area (ac)J D I Area (ac)
Cultivated Land
Without Conservation Treatment
72
81
88
91
With Conservation Treatment
62
71
78
81
Wood of Forest Land
Poor Cover (Thin)
45
66
77
83
Good Cover
25
55
70
77
Open Spance (lawns, parks, cemeteries, etc)
Poor Condition
(grass cover <50%)
68
79
86
89
Fair Condition
(grass cover 50%-75%)
49
69
79
84
Good Condition
(grass cover >75%)
39
1.08
61
74
80
Impervious Area
Parking Lots, Roofs, Drives, etc.
1 98 1
1 98
98
98
Soil Area per Hydrologic Group
1 1 1.08
1 1 0
0
0
Drainage Area = Area Total
Weighted Curve Number
CN = [(CNi*Ai)+ (CNn*An)]/Atot
TRUE 1.08
Post Development Area 2 Curve Number 39.00

Runoff Curve Numbers
Cover Description
Cover Type and Hydrologic Condition A B C D
Cultivated Land
Without Conservation Treatment
72
81
88
91
With Conservation Treatment
62
71
78
81
Wood of Forest Land
Poor Cover (Thin)
45
66
77
83
Good Cover
25
55
70
77
Open Spance (lawns, parks, cemeteries, etc)
Poor Condition (grass cover <50%)
68
79
86
89
Fair Condition (grass cover 50%-75%)
49
69
79
84
Good Condition (grass cover >75%)
39
61
74
80
Impervious Areas
Parking Lots, Roofs, Driveways, etc.
98
98
98
98

Watershed Model Schematic
1
Hydraflow Hydrographs by Intelisolve v9.22
1 - Pre Area 1 2 - Post to SCM 3 - Post Dev. Bypass
r■l
4 - Post into SCM
® Total Post Development
Leaend
Hvd• Origin Description
1 SCS Runoff Pre Area 1
2 SCS Runoff Post to SCM
3 SCS Runoff Post Dev. Bypass
4 Reservoir Post into SCM
5 Combine Total Post Development
Project: Wetland #1.gpw Monday, Oct 18, 2021

Hydrograph Return Period Recap HydraflowHydrographsbylntelisolvev9.22
Hyd.
Hydrograph
Inflow
Peak Outflow (cfs)
Hydrograph
No.
type
Hyd(s)
description
(origin)
1-Yr
2-Yr
3-Yr
5-Yr
10-Yr
25-Yr
50-Yr
100-Yr
1
SCS Runoff
-------
0.058
-------
-------
-------
4.657
-------
-------
-------
Pre Area 1
2
SCS Runoff
-------
2.433
-------
-------
-------
14.05
-------
-------
-------
Post to SCM
3
SCS Runoff
-------
0.000
-------
-------
-------
0.051
-------
-------
-------
Post Dev. Bypass
4
Reservoir
2
0.053
-------
-------
-------
2.352
-------
-------
-------
Post into SCM
5
Combine
3,4
0.054
-------
-------
-------
2.597
-------
-------
-------
Total Post Development
Proj. file: Wetland #1.gpw
Monday, Oct 18, 2021

Hydrograph Summary Report
Hydraflow Hydrographs by Intelisolve v9.22
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
peak
(min)
Hyd.
volume
(cuft)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(cuft)
Hydrograph
description
1
SCS Runoff
0.058
1
902
2,008
----
------
------
Pre Area 1
2
SCS Runoff
2.433
2
730
12,510
----
------
------
Post to SCM
3
SCS Runoff
0.000
2
n/a
0
----
------
------
Post Dev. Bypass
4
Reservoir
0.053
2
1456
11,063
2
247.98
10,041
Post into SCM
5
Combine
0.054
2
1456
11,418
3,4
------
------
Total Post Development
Wetland #1.gpw
Return Period: 1 Year
Monday, Oct 18, 2021

I
Hydrograph Report
Hydraflow Hydrographs by Intelisolve v9.22
Monday, Oct 18, 2021
Hyd. No. 1
Pre Area 1
Hydrograph type
= SCS Runoff
Peak discharge
= 0.058 cfs
Storm frequency
= 1 yrs
Time to peak
= 902 min
Time interval
= 1 min
Hyd. volume
= 2,008 cuft
Drainage area
= 8.950 ac
Curve number
= 49.6
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= TR55
Time of conc. (Tc)
= 22.50 min
Total precip.
= 2.86 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Pre Area 1
Q (cfs) Hyd. No. 1 -- 1 Year Q (cfs)
0.10 0.10
0.09 0.09
0.08 0.08
0.07 0.07
0.06 0.06
0.05 0.05
0.04 0.04
0.03 0.03
0.02 0.02
0.01 0.01
0.00 - 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 1 Time (min)

Hydrograph Report
5
Hydraflow Hydrographs by Intelisolve v9.22
Hyd. No. 2
Post to SCM
Hydrograph type
= SCS Runoff
Storm frequency
= 1 yrs
Time interval
= 2 min
Drainage area
= 8.080 ac
Basin Slope
= 0.0 %
Tc method
= TR55
Total precip.
= 2.86 in
Storm duration
= 24 hrs
Monday, Oct 18, 2021
Peak discharge = 2.433 cfs
Time to peak
= 730 min
Hyd. volume
= 12,510 cuft
Curve number
= 64.3
Hydraulic length
= 0 ft
Time of conc. (Tc)
= 22.10 min
Distribution
= Type II
Shape factor
= 484
Post to SCM
Q (cfs) Hyd. No. 2 -- 1 Year Q (cfs)
3.00 3.00
2.00 2.00
1.00 1.00
0.00 - 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 2 Time (min)

Hydrograph Report
Hydraflow Hydrographs by Intelisolve v9.22
Monday, Oct 18, 2021
Hyd. No. 3
Post Dev. Bypass
Hydrograph type
= SCS Runoff
Peak discharge
= 0.000 cfs
Storm frequency
= 1 yrs
Time to peak
= n/a
Time interval
= 2 min
Hyd. volume
= 0 cuft
Drainage area
= 1.080 ac
Curve number
= 39
Basin Slope
= 3.0 %
Hydraulic length
= 3050 ft
Tc method
= KIRPICH
Time of conc. (Tc)
= 14.50 min
Total precip.
= 2.86 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Post Dev. Bypass
Q (cfs) Hyd. No. 3 -- 1 Year Q (cfs)
0.10
0.10
0.09
0.09
0.08
0.08
0.07
0.07
0.06
0.06
0.05
0.05
0.04
0.04
0.03
0.02
0.03
0.02
0.01 0.01
0.00 - 0.00
0 20 40 60 80 100 120
— Hyd No. 3 Time (min)

Hydrograph
Report
7
Hydraflow Hydrographs by Intelisolve v9.22
Monday, Oct 18, 2021
Hyd. No. 4
Post into SCM
Hydrograph type
= Reservoir
Peak discharge
= 0.053 cfs
Storm frequency
= 1 yrs
Time to peak
= 1456 min
Time interval
= 2 min
Hyd. volume
= 11,063 cuft
Inflow hyd. No.
= 2 - Post to SCM
Max. Elevation
= 247.98 ft
Reservoir name
= SCM #1
Max. Storage
= 10,041 cuft
Storage Indication method used
Q (cfs)
3.00
1.00
Post into SCM
Hyd. No. 4 -- 1 Year
Q (cfs)
3.00
2.00
1.00
I 'I I I 10.00
600 1200 1800 2400 3000 3600 4200 4800 5400 6000
Time (min)
Hyd No. 4 Hyd No. 2 Total storage used = 10,041 cuft

Pond Report $
Hydraflow Hydrographs by Intelisolve v9.22
Monday, Oct 18, 2021
Pond No. 1 - SCM #1
Pond Data
Contours - User -defined contour areas. Average end area method used for volume calculation.
Begining Elevation = 246.50 ft
Stage / Storage Table
Stage (ft) Elevation (ft)
Contour area (sgft)
Incr. Storage (cult)
Total storage (cuft)
0.00 246.50
5,529
0
0
0.50 247.00
6,535
3,016
3,016
1.50 248.00
7,793
7,164
10,180
2.50 249.00
9,408
8,601
18,781
3.50 250.00
11,854
10,631
29,412
4.00 250.50
13,987
6,460
35,872
Culvert / Orifice Structures
Weir Structures
[A]
[B]
[C]
[PrfRsr]
[A]
[B]
[C]
[D]
Rise (in)
= 15.00
1.30
0.00
0.00
Crest Len (ft)
= 10.00
15.00
0.00
0.00
Span (in)
= 15.00
1.30
0.00
0.00
Crest El. (ft)
= 249.25
250.10
0.00
0.00
No. Barrels
= 1
1
0
0
Weir Coeff.
= 3.33
3.33
3.33
3.33
Invert El. (ft)
= 246.30
246.50
0.00
0.00
Weir Type
= Rect
Broad
---
---
Length (ft)
= 46.00
0.50
0.00
0.00
Multi -Stage
= Yes
No
No
No
Slope (%)
= 7.17
0.00
0.00
n/a
N-Value
= .013
.013
.013
n/a
Orifice Coeff.
= 0.60
0.60
0.60
0.60
Exfil.(in/hr)
= 0.000 (by
Contour)
Multi -Stage
= n/a
Yes
No
No
TW Elev. (ft)
= 0.00
Stage (ft)
4.00
3.00
2.00
1.00
0.00 r 1
0.00 2.00
Total Q
Note: Culvert/Orifice outflows are analyzed under inlet (ic) and outlet (oc) control. Weir risers checked for orifice conditions (ic) and submergence (s).
4.00 6.00
Stage / Discharge
Elev (ft)
250.50
249.50
248.50
247.50
246.50
8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00
Discharge (cfs)

Hydrograph Report
Hydraflow Hydrographs by Intelisolve v9.22
Monday, Oct 18, 2021
Hyd. No. 5
Total Post Development
Hydrograph type = Combine
Peak discharge =
0.054 cfs
Storm frequency = 1 yrs
Time to peak =
1456 min
Time interval = 2 min
Hyd. volume =
11,418 cuft
Inflow hyds. = 3, 4
Contrib. drain. area =
1.080 ac
Q (cfs)
0.10
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0.00 ' '
0 600
Hyd No. 5
Total Post Development
Hyd. No. 5 -- 1 Year
1200 1800 2400
Hyd No. 3
3000 3600
Hyd No. 4
4200 4800 5400
Q (cfs)
0.10
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
1 0.00
6000
Time (min)

Hydrograph Summary Report
10
Hydraflow Hydrographs by Intelisolve v9.22
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
peak
(min)
Hyd.
volume
(cuft)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(cuft)
Hydrograph
description
1
SCS Runoff
4.657
1
730
23,834
----
------
------
Pre Area 1
2
SCS Runoff
14.05
2
728
51,188
----
------
------
Post to SCM
3
SCS Runoff
0.051
2
738
900
----
------
------
Post Dev. Bypass
4
Reservoir
2.352
2
764
44,100
2
249.42
23,199
Post into SCM
5
Combine
2.597
2
760
45,448
3,4
------
------
Total Post Development
Wetland #1.gpw
Return Period: 10 Year
Monday, Oct 18, 2021

Hydrograph Report
11
Hydraflow Hydrographs by Intelisolve v9.22
Hyd. No. 1
Pre Area 1
Hydrograph type
= SCS Runoff
Storm frequency
= 10 yrs
Time interval
= 1 min
Drainage area
= 8.950 ac
Basin Slope
= 0.0 %
Tc method
= TR55
Total precip.
= 5.17 in
Storm duration
= 24 hrs
Monday, Oct 18, 2021
Peak discharge = 4.657 cfs
Time to peak
= 730 min
Hyd. volume
= 23,834 cuft
Curve number
= 49.6
Hydraulic length
= 0 ft
Time of conc. (Tc)
= 22.50 min
Distribution
= Type II
Shape factor
= 484
Pre Area 1
Q (cfs) Q (cfs)
Hyd. No. 1 -- 10 Year
5.00 5.00
4.00 4.00
3.00 3.00
2.00 2.00
1.00 1.00
0.00 - 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 1 Time (min)

Hydrograph Report
12
Hydraflow Hydrographs by Intelisolve v9.22
Hyd. No. 2
Post to SCM
Hydrograph type
= SCS Runoff
Storm frequency
= 10 yrs
Time interval
= 2 min
Drainage area
= 8.080 ac
Basin Slope
= 0.0 %
Tc method
= TR55
Total precip.
= 5.17 in
Storm duration
= 24 hrs
Monday, Oct 18, 2021
Peak discharge
= 14.05 cfs
Time to peak
= 728 min
Hyd. volume
= 51,188 cuft
Curve number
= 64.3
Hydraulic length
= 0 ft
Time of conc. (Tc)
= 22.10 min
Distribution
= Type II
Shape factor
= 484
Post to SCM
Q (cfs) Hyd. No. 2 -- 10 Year Q (cfs)
15.00 15.00
12.00 12.00
9.00 9.00
6.00 6.00
3.00 3.00
0.00 - 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 2 Time (min)

13
Hydrograph Report
Hydraflow Hydrographs by Intelisolve v9.22
Monday, Oct 18, 2021
Hyd. No. 3
Post Dev. Bypass
Hydrograph type
= SCS Runoff
Peak discharge
= 0.051 cfs
Storm frequency
= 10 yrs
Time to peak
= 738 min
Time interval
= 2 min
Hyd. volume
= 900 cuft
Drainage area
= 1.080 ac
Curve number
= 39
Basin Slope
= 3.0 %
Hydraulic length
= 3050 ft
Tc method
= KIRPICH
Time of conc. (Tc)
= 14.50 min
Total precip.
= 5.17 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Post Dev. Bypass
Q (cfs) Hyd. No. 3 -- 10 Year Q (cfs)
0.10 0.10
0.09 0.09
0.08 0.08
0.07 0.07
0.06 0.06
0.05 0.05
0.04 0.04
0.03 0.03
0.02 0.02
0.01 0.01
0.00 - 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Hyd No. 3 Time (min)

14
Hydrograph Report
Hydraflow Hydrographs by Intelisolve v9.22
Monday, Oct 18, 2021
Hyd. No. 4
Post into SCM
Hydrograph type
= Reservoir
Peak discharge
= 2.352 cfs
Storm frequency
= 10 yrs
Time to peak
= 764 min
Time interval
= 2 min
Hyd. volume
= 44,100 cuft
Inflow hyd. No.
= 2 - Post to SCM
Max. Elevation
= 249.42 ft
Reservoir name
= SCM #1
Max. Storage
= 23,199 cuft
Storage Indication method used.
Q (cfs)
15.00
12.00
OR
1H
ME
M
600 1200
Hyd No. 4
Post into SCM
Hyd. No. 4 -- 10 Year
Q (cfs)
15.00
12.00
3.00
0.00
1800 2400 3000 3600 4200 4800 5400 6000
Time (min)
- Hyd No. 2 Total storage used = 23,199 cuft

Hydrograph Report
15
Hydraflow Hydrographs by Intelisolve v9.22
Hyd. No. 5
Total Post Development
Hydrograph type = Combine
Storm frequency = 10 yrs
Time interval = 2 min
Inflow hyds. = 3, 4
Q (cfs)
3.00
1.00
e
Monday, Oct 18, 2021
Peak discharge =
2.597 cfs
Time to peak =
760 min
Hyd. volume =
45,448 cuft
Contrib. drain. area =
1.080 ac
Total Post Development
Hyd. No. 5 -- 10 Year
Q (cfs)
3.00
2.00
1.00
0.00
600 1200 1800 2400 3000 3600 4200 4800 5400 6000
Time (min)
Hyd No. 5 Hyd No. 3 Hyd No. 4