SW5240401_Stormwater Report_20240404

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RSC DEVELOPMENT—YOUNGSVILLE, N.C.
STORMWATER REPORT FOR LOW DENSITY PROJECTS (REVISED)
The proposed Project is located at 265 Northbrook Drive north of Youngsville in Southern
Franklin County. The site is in Youngsville's Planning Jurisdiction/ETJ. The Development
Proposal is for the construction of a 10,800 sf Cold Steel Fabrication Facility. The property is
identified on the Franklin County Tax Maps as PIN 1853-38-3404.
The property will be developed as a Low Density Project per the NCDEQ Stormwater Design
Manual (Chapter E-1). The Built-Upon Area will be less than 24% and the site surface drainage
from the parking and gravel storage areas will be dispersed through a system of grass swales to
an undisturbed wooded area at the rear of the property. No curb and gutter is proposed. The
roof drainage will also discharge to the surface and be collected by the network of site swales.
Details are provided on the attached Site Construction Plans. The Grass Swales have been
designed for a 10-Storm event with a flow depth of approximately 4.5 inches and a maximum
velocity less than 2.50 feet/sec. The Rational Coefficient of Runoff used for the impervious
areas is 0.95. A Coefficient Value of 0.50 has been selected for the landscaped and seeded
areas. Design calculations for the grass swales are included in this report. A Timber Check Dam
has been proposed at the downstream end of the 2 primary site swales to facilitate the
dispersal of runoff into the existing forested area at the rear of the site.
The property is in the Tar-Pamlico River Basin. The receiving stream is an unnamed tributary to
Brandy Creek and is classified as B, NSW. No Riparian Buffers, Wetlands, or Flood Hazard Areas
exist on the property. Mr. Sean Clark, PWS, of Sage Ecological Services, Inc., has evaluated the
property for both Wetlands and Riparian Buffers. The Wetland Report is attached. The Site
Soils per the Franklin County Soil Survey are Cecil Sandy Loam. The Cecil Soil Series are
classified as Hydraulic Soil Group "B".
The Time of Concentration for both the Pre- and Post-Development Conditions is less than 5
minutes. A minimum Tc of 5 minutes has been used in this analysis.
The existing site is fully wooded with a mix of mature pines and developing hardwood
understory. The Developed Site will have a minimal footprint of paved and roof areas with t
and landscaped areas established on all surfaces disturbed by construction a .
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PO Box 2007 Wake Forest, NC 27588 harry-?mitchelldesgroup.com 919.280.0354

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NORTH North American Green
5401 St. Wendel-Cynthiana Rd.
AMERICAN Poseyville, Indiana 47633
GREEN Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
CHANNEL ANALYSIS
>>>Grass Swale#1
Name Grass Swale#1 /
Discharge 2.79 .210 ' O, €34 71 /4/y!I x o,li(ei
Channel Slope 0.0125
Channel Bottom Width 4
Left Side Slope 6
Right Side Slope 6
Low Flow Liner
Retardence Class D 2-6 in
Vegetation Type Bunch Type
Vegetation Density Good 65-79%
Soil Type Clay Loam(CL)
S150
Phase Reach Discharge Velocity Normal Mannings N Permissible Calculated Safety Staple
Remarks
Depth Shear Stress Shear Stress Factor Pattern
S150 Straight 2.79 cfs 1.25 ft/s 0.36 ft 0.055 1.8 lbs/ft2 0.28 lbs/ft2 6.39 STABLE D
Unvegetated
Underlying Straight 2.79 cfs 1.25 ft/s 0.36 ft 0.055 1.96 lbs/ft2 0.21 Ibs/ft2 9.48 STABLE D
Substrate
Unreinforced Vegetation
Phase Reach Discharge Velocity Normal Mannings N Permissible Calculated Safety Remarks Staple
Depth Shear Stress Shear Stress Factor Pattern
Unreinforced Straight 2.79 cfs 1.2 ft/s 0.37 ft 0.058 4 lbs/ft2 0.29 lbs/ft2 13.76 STABLE --
Vegetation
Underlying Straight 2.79 cfs 1.2 ft/s 0.37 ft 0.058 3.17 lbs/ft2 0.21 lbs/ft2 14.95 STABLE --
Substrate

NORTH North American Green
AMERICANEl
5401 St. Wendel-Cynthiana Rd.
Poseyville, Indiana 47633
GREEN Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
CHANNEL ANALYSIS
>>>Grass Swale#2
Name Grass Swale#2
Discharge 2.9 a10= O i 7C-7.24 ,4/4 . 7(c icAkeAe,,
Channel Slope 0.0222 4,2
Channel Bottom Width 4
Left Side Slope 6
Right Side Slope 6
Existing Bend Radius 50
Low Flow Liner
Retardence Class D 2-6 in
Vegetation Type Bunch Type
Vegetation Density Good 65-79%
Soil Type Clay Loam(CL)
S150
Phase Reach Discharge Velocity Normal Mannings N Permissible Calculated Safety Remarks Staple
Depth Shear Stress Shear Stress Factor Pattern
S150 Straight 2.9 cfs 1.69 ft/s 0.3 ft 0.049 1.8 lbs/ft2 0.41 lbs/ft2 4.37 STABLE D
Unvegetated
Underlying Straight 2.9 cfs 1.69 ft/s 0.3 ft 0.049 1.96 lbs/ft2 0.31 lbs/ft2 6.27 STABLE D
Substrate
S150 Bend 2.9 cfs 1.69 ft/s 0.3 ft 0.049 1.8 Ibs/ft2 0.55 lbs/ft2 3.27 STABLE D
Unvegetated
Underlying Bend 2.9 cfs 1.69 ft/s 0.3 ft 0.049 1.96 lbs/ft2 0.42 Ibs/ft2 4.69 STABLE D
Substrate
Unreinforced Vegetation
Normal Permissible Calculated Safety Staple
Phase Reach Discharge Velocity Depth Mannings N Shear Stress Shear Stress Factor Remarks Pattern
Unreinforced Straight 2.9 cfs 1.66 ft/s 0.3 ft 0.05 4 lbs/ft2 0.42 lbs/ft2 9.61 STABLE --
Vegetation
Underlying Straight 2.9 cfs 1.66 ft/s 0.3 ft 0.05 2.31 lbs/ft2 0.32 Ibs/ft2 7.33 STABLE --
Substrate
Unreinforced Bend 2.9 cfs 1.66 ft/s 0.3 ft 0.05 4 lbs/ft2 0.56 lbs/ft2 7.16 STABLE --
Vegetation
Underlying Bend 2.9 cfs 1.66 ft/s 0.3 ft 0.05 2.31 lbs/ft2 0.42 lbs/ft2 5.46 STABLE --
Substrate

NORTH North American Green
5401 St. Wendel-Cynthiana Rd.
EN AMERICAN Poseyville, Indiana 47633
GREEN Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
CHANNEL ANALYSIS
>>>Grass Swale#3
Name Grass Swale#3 2� /j,
Discharge 4.24 `"Ct0 n,V71 —/` I�/c $ 0'1 J � i
Channel Slope 0.0315
Channel Bottom Width 4
Left Side Slope 6
Right Side Slope 6
Low Flow Liner
Retardence Class D 2-6 in
Vegetation Type Bunch Type
Vegetation Density Good 65-79%
Soil Type Clay Loam(CL)
S150
Phase Reach Discharge Velocity Normal Mannings N Permissible Calculated Safety Remarks Staple
Depth Shear Stress Shear Stress Factor Pattern
5150 Straight 4.24 cfs 2.31 ft/s 0.31 ft 0.044 1.8 lbs/ft2 0.61 lbs/ft2 2.93 STABLE D
Unvegetated
Underlying Straight 4.24 cfs 2.31 ft/s 0.31 ft 0.044 1.96 Ibs/ft2 0.46 Ibs/ft2 4.24 STABLE D
Substrate
Unreinforced Vegetation
Phase Reach Discharge Velocity Normal Mannings N Permissible Calculated Safety Remarks Staple
Depth Shear Stress Shear Stress Factor Pattern
Unreinforced Straight 4.24 cfs 2.34 ft/s 0.31 ft 0.043 4 Ibs/ft2 0.61 Ibs/ft2 6.58 STABLE --
Vegetation
Underlying Straight 4.24 cfs 2.34 ft/s 0.31 ft 0.043 1.71 Ibs/ft2 0.46 lbs/ft2 3.74 STABLE --
Substrate

NORTH North American Green
5401 St. Wendel-Cynthiana Rd.
AMERICAN Poseyville, Indiana 47633
GREEN Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
CHANNEL ANALYSIS
>>>Grass Swale#4
Name Grass Swale#4
Discharge 1.09 Q No = D,eel X l i24 1/4/1.}e 14 0,Z ,
Channel Slope 0.0225
Channel Bottom Width 4
Left Side Slope 6
Right Side Slope 6
Low Flow Liner
Retardence Class D 2-6 in
Vegetation Type Bunch Type
Vegetation Density Good 65-79%
Soil Type Clay Loam(CL)
S150
Phase Reach Discharge Velocity Normal Mannings N Permissible Calculated Safety Remarks Staple
Depth Shear Stress Shear Stress Factor Pattern
S150 Straight 1.09 cfs 1.16 ft/s 0.18 ft 0.054 1.8 Ibs/ft2 0.26 lbs/ft2 6.96 STABLE D
Unvegetated
Underlying Straight 1.09 cfs 1.16 ft/s 0.18 ft 0.054 1.96 lbs/ft2 0.21 lbs/ft2 9.28 STABLE D
Substrate
Unreinforced Vegetation
Phase Reach Discharge Velocity Normal Mannings N Permissible Calculated Safety Remarks Staple
Depth Shear Stress Shear Stress Factor Pattern
Unreinforced Straight 1.09 cfs 1.11 ft/s 0.19 ft 0.058 4 lbs/ft2 0.27 lbs/ft2 15.01 STABLE --
Vegetation
Underlying Straight 1.09 cfs 1.11 ft/s 0.19 ft 0.058 3.12 lbs/ft2 0.22 lbs/ft2 14.37 STABLE --
Substrate

_ NOAA Atlas 14,Volume 2,Version 3
Location name:Youngsville, North Carolina,USA* 4'"\
'` Latitude: 36.0522°, Longitude:-78.4828° .
� �; -
Elevation:434 ft"
\ % 'source:ESRI Maps ",..., T,
source:USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M.Bonnin,D.Martin,B.Lin,T.Parzybok,M.Yekta,and D.Riley
NOAA,National Weather Service,Silver Spring,Maryland
PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches/hour)1
Average recurrence interval(years)
Duration 1 2 5 10 25 50 100 200 500 1000
5-min 4.86 5.66 6.48 7.24 8.03 8.63 9.17 9.64 10.2 10.6
(4.49-5.28) (5.22-6.16) (5.95-7.03) (6.65-7.85) (7.33-8.70) (7.85-9.36) (8.29-9.94) (8.65-10.5) (9.06-11.1) (9.37-11.6)
10-min 3.88 4.53 5.18 5.79 6.40 6.87 7.28 7.64 8.03 8.35
(3.58-4.22) (4.17.4.92) (4.77-5.63) (5.32-6.28) (5.84-6.94) (6.25-7.45) (6.59-7.90) (6.86-8.30) (7.16-8.74) (7.38-9.10)
15-min 3.23 3.80 4.37 4.88 5.40 5.80 6.14 6.42 6.74 6.99
(2.98-3.52) (3.50-4.12) (4.02-4.74) (4.48-5.30) (4.94-5.86) (5.27-6.29) (5.55-6.65) (5.77-6.98) (6.01-7.33) (6.18-7.61)
30-min 2.22 2.62 3.11 3.54 4.00 4.37 4.70 5.00 5.36 5.66
(2.0 5-2.41) (2.41-2.85) (2.86-3.37) (3.25-3.84) (3.66-4.34) (3.97-4.74) (4.25-5.10) 4.49-5.44) (4.78-5.84) (5.00-6.16)
60-min 1.38 1.64 1.99 2.30 2.66 2.96 3.24 3.51 3.85 4.13
(1.28-1.50) (1.51-1.79) (1.83-2.16) (2.11-2.50) (2.44-2.89) (2.69-3.21) (2.93-3.51) (3.15-3.81) (3.43-4.19) (3.65-4.50)
2-hr 0.812 0.968 1.19 1.38 1.62 1.83 2.02 2.22 2.48 2.70
(0.743-0.888) (0.888-1.06) (1.08-1.29) (1.26-1.51) (1.47-1.76) (1.65-1.99) (1.81-2.20) (1.98-2.42) (2.18-2.70) (2.36-2.95)
3-hr 0.574 0.685 0.841 0.989 1.17 1.33 1.49 1.65 1.87 2.06
(0.524-0.633),(0.627-0.755) (0.766-0.927) (0.898-1.09) (1.06-1.28) (1.19-1.46) (1.32-1.63) (1.46-1.81) (1.63-2.04) (1.78-2.26)
6-hr 0.� 0.411 0.506 0.596 0.709 0.809 0.909 1.01 1.15 1.28
(0.314-0.381) (0.376-0.454) (0.461-0.558) (0.542-0.656) (0.640-0.777) (0.725-0.886) (0.808-0.995) (0.892-1.11) (1.00-1.26) (1.10-1.40)
12-hr 0.202 0.241 0.298 0.353 0.423 0.485 0.549 0.617 0.710 0.795
(0.185-0.222) (0.222-0.265) (0.273-0.327) (0.322-0.387) (0.384-0.462) (0.437-0.529) (0.489-0.597) (0.544-0.671) (0.617-0.772) (0.680-0.865)
24-hr 0.119 0.144 0.181 0.209 0.248 0.278 0.310 0.342 0.386 0.421
(0.111-0.128) (0.135-0.155) (0.169-0.194) (0.195-0.224) (0.230-0.266) (0.258-0.299) (0.286-0.333) (0.315-0.367) (0.354-0.415) (0.384-0.453)
2-day 0.069 0.083 0.104 0.119 0.141 0.157 0.174 0.192 0.215 0.234
(0.065-0.074) (0.078-0.089) (0.097-0.111) (0.111-0.128) (0.131-0.151) (0.146-0.169) (0.161-0.187) (0.176-0.206) (0.197-0.232) (0.213-0.253)
-
3-day 0.049 0.059 0.072 0.083 0.098 0.110 0.122 0.134 0.151 0.164
(0.045-0.052) (0.055-0.063) (0.068-0.078) (0.078-0.089) (0.091-0.105) (0.102-0.118) (0.113-0.130) (0.123-0.144) (0.138-0.162) (0.149-0.176)
4-day 0.038 0.046 0.057 0.065 0.077 0.086 0.095 0.105 0.118 0.128
(0.036-0.041) (0.043-0.049) (0.053-0.061) (0.061-0.070) (0.072-0.082) (0.080-0.092) (0.088-0.102) (0.097-0.113) (0.108-0.127) (0.117-0.138)
7-day 0.025 0.030 0.037 0.042 0.049 0.055 0.061 0.067 0.075 0.081
(0.024-0.027) (0.028-0.032) (0.035-0.039) (0.039-0.045) (0.046-0.053) (0.051-0.059) (0.056-0.065) (0.062-0.072) (0.069-0.081) (0.074-0.088)
10-day 0.020 0.024 0.029 0.033 0.038 0.042 0.046 0.050 0.056 0.060
(0.019-0.021) (0.022-0.026) (0.027-0.031) (0.031-0.035) (0.035-0.040) (0.039-0.045) (0.043-0.049) (0.047-0.054) (0.052-0.060) (0.056-0.065)
20-day 0.013 0.016 0.019 0.021 0.024 0.027 0.029 0.032 0.035 0.038
(0.012-0.014) (0.015-0.017) (0.018-0.020) (0.020-0.022) (0.023-0.026) (0.025-0.028) (0.027-0.031) (0.029-0.034) (0.032-0.038) (0.035-0.041)
30-day 0.011 0.013 0.015 0.017 0.019 0.021 0.022 0.024 0.026 0.028
(0.010-0.012) (0.012-0.014).(0.014-0.016) (0.016-0.018) (0.018-0.020) (0.019-0.022) (0.021-0.024) (0.022-0.026) (0.024-0.028) (0.026-0.030)
45-day 0.009 0.011 0.012 0.014 0.015 0.017 0.018 0.019 0.021 0.022
(0.009-0.010) (0.010-0.011) (0.012-0.013) (0.013-0.014) (0.014-0.016) (0.016-0.017) (0.017-0.019) (0.018-0.020) (0.019-0.022) (0.020-0.023)
60-dey 0.008 0.010 0.011 0.012 0.013 0.014 0.015 0.016 0.017 0.018
(0.008-0.009) (0.009-0.010) (0.010-0.012) (0.011-0.013) (0.013-0.014) (0.013-0.015) (0.014-0.016) (0.015-0.017) (0.016-0.018) (0.017-0.019)
1 Precipitation frequency(PF)estimates in this table are based on frequency analysis of partial duration series(PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90%confidence interval.The probability that precipitation frequency estimates(for
a given duration and average recurrence interval)will be greater than the upper bound(or less than the lower bound)is 5%.Estimates at upper bounds are not
checked against probable maximum precipitation(PMP)estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
Back to Top
PF graphical

PDS-based intensity-duration-frequency (IDF) curves
Latitude: 36.0522°, Longitude: -78.4828°
101 Average recurrence
interval
(years)
4' 10° - . 5
a
y
c � � 25
. - 50
A 10"1 - ,� — 100
a 200
E ,`` - 500
1000
10-2 -
1 I 1 1 1 1 1
te 12 f vE E E E A, A 4 v -r-o - v -9 -o-
'^ o � $ Duration
N Nf�4n op 4 p
101 f - - ------
_._,_ Duration
.c 10° -4,1 --- — 5 mm — 2-dayr_J
`-- 10-min 3-day
,42 —
c
4-day
ra 10' _ " - - -a 80 min — 10-day
y
2-hr — 20 day
L.
CI. - _— --- 3-hr — 30-day
6fir — 45-day
10-2 �- 12-hr — 50-day
I I I I 24-hr
1 2 5 10 25 50 100 200 500 1000
Average recurrence interval (years)
NOAA Atlas 14,Volume 2,Version 3 Created(GMT):Mon Jan 15 17.22:36 2024
Back to Top
Maps & aerials
Small scale terrain

I
•
` n r _
3km Yl�ungsVtlie
1
' 2mi
Large scale terrain _
Lynchburg_
•
sbury Roanoke
N orfol
aiem 0
• • Durham —i— Rocky Mount
Greensboro •
Raleigh
• •Gil'eenvl
H CAROLINA —
hart•`�
100km
1 '
60mi Jacksonville •
•
Large scale map
31ackshurg ,,Roanoke
Norio
ston-Salern Greensboro
Dustime — Rocky Mount
R71ekih
Greenvill
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earl Otte
100km Fayetteville
60mi Jacksonville
Large scale aerial