SW6230401_Design Calculations_20230612

PHALANX CROSSFIT
Storm Water and Erosion & Sedimentation Control Calculations
REVISIONS PER 5/19/23 COMMENTS FROM DEMLR STORMWATER PROGRAM

Owner:
Phalanx Fitness, LLC
359 Sunridge Drive
Cameron, NC 28326

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Rip Rap Outlet Apron 02 2 Pages
Rip Rap Outlet Apron 03 2 Pages
Rip Rap Outlet Apron 04 2 Pages
Pond Stage-Storage Below Pool - Forebay 1 Page
Pond Stage-Storage Below Pool - Main Pool 1 Page
Driveway Culvert Drainage Area Map 1 Page
Surface Area and Depth Required for Main Pool 1 Page
Author: Jarrod E. Hilliard, PE, CFM
PO Box 249 Sanford, NC 27331
[phone]
NC License No. P-0836
Date: 5/22/23

User Input Data
Calculated Value
Reference Data
Designed By:JEH11/29/2022
Checked By:JEH5/19/2023
Company:Hilliard Engineering, PLLC
Project Name:Phalanx Crossfit
Project No.:HC2217
Site Location (City/Town)Spout Springs
Id.02 -SCM Outlet
Total Drainage Area (acres)0.76
Rational Method for Flow
Pipe diam., D (in.)3
o
Tailwater depth (in.)0
Minimum/Maximum tailwater?Min TW (Fig. 8.06a)
0.56
Discharge (cfs)
Velocity (ft./s)16.5
Minimum TWMaximum TW
Figure 8.06aFigure 8.06b
Riprap d, (ft.)
0.2
50
Minimum apron length, L (ft.)
7
a
Apron width at pipe outlet (ft.)
0.750.75
Apron shape
TrapezoidalTrapezoidal

Apron width at outlet end (ft.)
7.250.25
Minimum TWMaximum TW
Max Stone Diameter, dmax (ft.)0.30
Minimum TWMaximum TW
(ft.)0.450
Apron Thickness

User Input Data
Calculated Value
Reference Data
Designed By:JEH1/11/2023
Checked By:JEH1/11/2023
Company:Hilliard Engineering, PLLC
Project Name:Phalanx Crossfit
Project No.:HC2217
Site Location (City/Town)Spout Springs
Id.03 -Swale 01B Outlet
Total Drainage Area (acres)1.57
Rational Method for Flow
Equiv. Outlet diam., D (in.)18
o
Tailwater depth (in.)0.25
Minimum/Maximum tailwater?Min TW (Fig. 8.06a)
3.72
Discharge (cfs)
Velocity (ft./s)2.23
Minimum TWMaximum TW
Figure 8.06aFigure 8.06b
Riprap d, (ft.)
0.35
50
Minimum apron length, L (ft.)
9
a
Apron width at pipe outlet (ft.)
4.54.5
Apron shape
TrapezoidalTrapezoidal

Apron width at outlet end (ft.)
10.51.5
Minimum TWMaximum TW
Max Stone Diameter, dmax (ft.)0.5250
Minimum TWMaximum TW
(ft.)0.78750
Apron Thickness

User Input Data
Calculated Value
Reference Data
Designed By:JEH11/29/2022
Checked By:JEH11/29/2022
Company:Hilliard Engineering, PLLC
Project Name:Phalanx Crossfit
Project No.:HC2217
Site Location (City/Town)Spout Springs
Id.04 -Swale 01A Outlet
Total Drainage Area (acres)0.55
Rational Method for Flow
Equiv. Outlet diam., D (in.)18
o
Tailwater depth (in.)0.25
Minimum/Maximum tailwater?Min TW (Fig. 8.06a)
1.3
Discharge (cfs)
Velocity (ft./s)0.93
Minimum TWMaximum TW
Figure 8.06aFigure 8.06b
Riprap d, (ft.)
0.35
50
Minimum apron length, L (ft.)
9
a
Apron width at pipe outlet (ft.)
4.54.5
Apron shape
TrapezoidalTrapezoidal

Apron width at outlet end (ft.)
10.51.5
Minimum TWMaximum TW
Max Stone Diameter, dmax (ft.)0.5250
Minimum TWMaximum TW
(ft.)0.78750
Apron Thickness

WET POND STAGE-STORAGE BELOW PERMANENT POOL
FOREBAY ONLY
WET POND 01
PHALANX CROSSFIT
Project #
Date :5/19/2023
Evaluation By:JEH
OBJECTIVE:Determine volumes below permanent pool
GIVEN:
Location:Spout Springs, NC
Watershed Area:
0.76
Accum. Storage (cu.
ft)
Contour (ft-MSL):Area (sf) Inc. Vol (cu. ft)Stage (ft)
364.500,000 0,0000,0000.00
368.00,1250,2190,2193.50
368.50,2010,0820,3004.00
ACTUAL AVAILABLE STORAGE BELOW
PERMANENT POOL
369.00,2970,1250,4254.50
370.00,5400,4190,8435.50
370.50,6900,3081,1516.00
MAIN POOL VOLUME:6,128 cf% OF MAIN POOL:18.78%
AVG. DEPTH MAIN POOL:3.01 ft
364.50 IS TOP OF SEDIMENT STORAGE IN THE FOREBAY
TOTAL VOLUME BELOW PERMANENT POOL
Contour (ft-MSL):Area (sf)
364.5165
368.01,235
368.51,480
369.01,754
370.02,376
370.52,728
2,038 IS SURFACE AREA OF THE MAIN PERMANENT POOL

WET POND STAGE-STORAGE BELOW PERMANENT POOL
MAIN POOL ONLY
WET POND 01
PHALANX CROSSFIT
Project #
Date :5/19/2023
Evaluation By:JEH
OBJECTIVE:Determine volumes below permanent pool
GIVEN:
Location:Spout Springs, NC
Watershed Area:0.76
Accum. Storage
(cu. ft)
Contour (ft-MSL):Area (sf) Inc. Vol (cu. ft)Depth (ft)
364.500,165 0,0000,0000.00
368.001,1102,2312,2313.50
368.501,2790,5972,8294.00ACTUAL AVAILABLE STORAGE BELOW
PERMANENT POOL
369.001,4570,6843,5134.50
370.001,8361,6475,1595.50
370.502,0380,9696,1286.00

PHALANX CROSSFIT
WET POND
DRIVEWAY CULVERT
DRAINAGE AREA MAP
N.T.S.

PHALANX CROSSFIT
SURFACE AREA AND DEPTH REQUIRED FOR MAIN POOL
EQUATION 2
WET POND 01
TABLE 1 PIEDMONT AND MOUNTAIN SA/DA TABLETABLE 1 PIEDMONT AND MOUNTAIN SA/DA T
INTERPOLATION (3 ft)INTERPOLATION (4 ft)
Known Lower Percent Impervious:80Known Lower Percent Impervious:80
Known Upper Percent Impervious:90Known Upper Percent Impervious:90
Known Lower SA/DA:2.92Known Lower SA/DA:2.41
Known Upper SA/DA:3.25Known Upper SA/DA:2.64
Computed Impervious:88.00 Computed Impervious:88.00
Unknown Target SA/DA:3.182.59Unknown Target SA/DA:
TABLE 1 PIEDMONT AND MOUNTAIN SA/DA TABLE
INTERPOLATION (Avg. Depth of Permanent Pool)
Known Lower Average Depth:3
Known Upper Average Depth:4
Known Lower SA/DA:2.92
Known Upper SA/DA:2.41
Computed Depth:3.01
Unknown Target SA/DA:2.91
Min. Surface Area Required for Main Pool Area:
SA/DA:2.91
Drainage Area to SCM:32,944sf
Min. Surface Area Req'd:960sf
Surface Area Provided:1,965sf
Main Pool Volume:cf
6,128
Main Pool Surface Area:sf
2,038
Main Pool Ave. Depth:
3.01