Nesbitt Farms Subdivision - 2018-06-14_21802_Nesbitt SW Calculation Manual

Mailing Address: P.O. Box 5432, Asheville, NC 28813
168 Patton Avenue Asheville, NC 28801 52 Walnut Street – Suite 9, Waynesville, NC 28786
Phone [phone] Fax [phone] Phone: [phone] Fax: [phone]

Project Name: Nesbitt Farms
Project Location: Mills River, NC
CDC Project No. 21802
Date: May 30th, 2018

EROSION CONTROL & STORM DRAINAGE NARRATIVE

General

The Farm at Mills River, LLC is proposing a single family subdivision with 79 lots. The parcels
(PIN# 9641-28-9849, 9641-28-1805, 9641-38-7847, 9641-17-9991, 9641-38-5701, 9641-19-4560,
9641-49-0022) is a total of 82.02 acres located at 294 Nesbitt Drive, Mills River. The existing site
has a house, old barns and sheds with asphalt driveways. Most of the site is pasture land with a small
portion of the site wooded. The site can be found on the “Skyland” USGS map as well as FEMA
firm maps 3700964100J dated 10/3/2008.

The project will consist of demolition and removal of some of the existing structures and one on the
asphalt driveways. The property will be lotted off in 79 single family lots. The site will consisted of
superelevated roads with permeant ditches with driveway connections for lot access. Low impact
measures and methods will be performed to maintain minimal disturbance throughout the site. Water
infrastructure will be extended along Jeffress Road and run throughout the site with fire hydrants and
air release valves at the appropriate locations. The sewer infrastructure will connect at two locations.
One will connect at an existing manhole east of the site along Jeffress Road and run though the site
to provide gravity sewer services. The second connection will convey wastewater to the west of the
site and connect to the existing sewer along Jeffress Road. Individual septic systems will be installed
as needed if gravity services are not possible. Refer to construction plans for further details of site
plan.

Erosion Control

Proposed erosion control measures consist of a construction entrance, silt fence, clean water
diversion ditches, temporary diversion ditches, temporary and permanent seeding, and stone inlet
protection and a skimmer basin to prevent sediment from leaving the site. The project consists of 20
acres that will be disturbed by grading and construction activities. The majority of disturbance will
be due to road construction. Skimmer basins and temporary diversion ditches have been design to
caught and treat areas that will be disturbed. Clean water diversion ditches have been placed to
caught and direct drainage that is either offsite or areas/lots that are not disturbed. Refer to
construction plans for further detail.

Storm Drainage

Stormwater runoff will be collected and conveyed through permanent ditches and driveway pipes.
The site is a low impact development and will not exceed the maximum 24% impervious at full
build out. A parcel impervious report is included showing the impervious calculations for the site.

Mailing Address: P.O. Box 5432, Asheville, NC 28813
168 Patton Avenue Asheville, NC 28801 52 Walnut Street – Suite 9, Waynesville, NC 28786
Phone [phone] Fax [phone] Phone: [phone] Fax: [phone]

Permanent stormwater conveyance pipes and ditches were sized based on the 25-year storm. The
runoff will be maintained and discharged offsite with appropriate sized energy dissipaters

Refer to construction documents and storm calculations for further details of the storm drainage.

Mailing Address: P.O. Box 5432, Asheville, NC 28813
168 Patton Avenue Asheville, NC 28801 52 Walnut Street – Suite 9, Waynesville, NC 28786
Phone [phone] Fax [phone] Phone: [phone] Fax: [phone]

TABLE OF CONTENTS

1. Erosion Control and Stormwater Narrative
I. General
II. Erosion Control
III. Storm Drainage
2. Permanent Ditch Calculations
3. Storm Pipe Calculations

4. Drainage Area Maps

5. Parcel Impervious Report

6. NRCS Soil Report
7. Figures
I. USGS Topo Map
II. FEMA FIRMette Map
III. NOAA Precipitation Tables
IV. Surface Water Classifications

Hydrology Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Tuesday, Jun 12 2018
Permanent Ditch #1 Hydrology
Hydrograph type = Rational Peak discharge (cfs) = 1.899
Storm frequency (yrs) = 10 Time interval (min) = 1
Drainage area (ac) = 0.670 Runoff coeff. (C) = 0.4
Rainfall Inten (in/hr) = 7.085 Tc by User (min) = 5
IDF Curve = Nesbitt.IDF Rec limb factor = 1.00
Hydrograph Volume = 570 (cuft); 0.013 (acft)
0 5 10
Q (cfs)
0.00 0.00
1.00 1.00
2.00 2.00
Q (cfs)
Time (min)
Runoff Hydrograph
10-yr frequency
Runoff Hyd - Qp = 1.90 (cfs)
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Tuesday, Jun 12 2018
Permanent Diversion Ditch #1
Triangular
Side Slopes (z:1) = 3.00, 3.00
Total Depth (ft) = 1.00
Invert Elev (ft) = 2105.00
Slope (%) = 7.10
N-Value = 0.025
Calculations
Compute by: Known Q
Known Q (cfs) = 1.90
Highlighted
Depth (ft) = 0.37
Q (cfs) = 1.900
Area (sqft) = 0.41
Velocity (ft/s) = 4.63
Wetted Perim (ft) = 2.34
Crit Depth, Yc (ft) = 0.48
Top Width (ft) = 2.22
EGL (ft) = 0.70
0 1 2 3 4 5 6 7 8
Elev (ft) Depth (ft)Section
2104.50 -0.50
2105.00 0.00
2105.50 0.50
2106.00 1.00
2106.50 1.50
2107.00 2.00
Reach (ft)
Hydrology Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Tuesday, Jun 12 2018
Permanent Ditch #2 Hydrology
Hydrograph type = Rational Peak discharge (cfs) = 2.202
Storm frequency (yrs) = 10 Time interval (min) = 1
Drainage area (ac) = 0.650 Runoff coeff. (C) = 0.48
Rainfall Inten (in/hr) = 7.058 Tc by User (min) = 5
IDF Curve = Nesbitt.IDF Rec limb factor = 1.00
Hydrograph Volume = 661 (cuft); 0.015 (acft)
0 5 10
Q (cfs)
0.00 0.00
1.00 1.00
2.00 2.00
3.00 3.00
Q (cfs)
Time (min)
Runoff Hydrograph
10-yr frequency
Runoff Hyd - Qp = 2.20 (cfs)
North American Green
5401 St. Wendel-Cynthiana Rd.
Poseyville, Indiana 47633
Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v6.0
CHANNEL ANALYSIS
> > > Permanent Ditch 2
Name Permanent Ditch 2
Discharge 2.2
Peak Flow Period 10
Channel Slope 0.077
Channel Bottom Width 0
Left Side Slope 3
Right Side Slope 3
Low Flow Liner
Retardence Class C 6-12 in
Vegetation Type Sod Former
Vegetation Density Good 75-95%
Soil Type Silt Loam
SC250 - Class C - Sod Former - Good 75-95%
SC250
Unvegetated
Straight 2.2 cfs 3.67 ft/s 0.45 ft 0.04 2.5 lbs/ft2 2.15 lbs/ft2 1.16 STABLE E
SC250
Reinforced
Vegetation
Straight 2.2 cfs 1.67 ft/s 0.66 ft 0.114 8 lbs/ft2 3.18 lbs/ft2 2.51 STABLE E
Underlying
Substrate
Straight 2.2 cfs 1.67 ft/s 0.66 ft -- 0.8 lbs/ft2 0.04 lbs/ft2 18.45 STABLE --
Phase Reach Discharge Velocity Normal Depth Mannings N Permissable Shear
Stress
Calculated Shear
Stress
Safety
Factor
Remarks Staple
Pattern
ECMDS 6.0 https://ecmds.com/project/136581/channel-analysis/143892/show
1 of 1 6/13/2018, 2:55 PM
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Tuesday, Jun 12 2018
Permanent Diversion Ditch #2
Triangular
Side Slopes (z:1) = 3.00, 3.00
Total Depth (ft) = 1.00
Invert Elev (ft) = 2118.57
Slope (%) = 7.70
N-Value = 0.025
Calculations
Compute by: Known Q
Known Q (cfs) = 2.20
Highlighted
Depth (ft) = 0.38
Q (cfs) = 2.200
Area (sqft) = 0.43
Velocity (ft/s) = 5.08
Wetted Perim (ft) = 2.40
Crit Depth, Yc (ft) = 0.51
Top Width (ft) = 2.28
EGL (ft) = 0.78
0 1 2 3 4 5 6 7 8
Elev (ft) Depth (ft)Section
2118.00 -0.57
2118.50 -0.07
2119.00 0.43
2119.50 0.93
2120.00 1.43
Reach (ft)
Hydrology Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Wednesday, Jun 13 2018
Permanent Ditch #3 Hydrology
Hydrograph type = Rational Peak discharge (cfs) = 2.664
Storm frequency (yrs) = 10 Time interval (min) = 1
Drainage area (ac) = 1.020 Runoff coeff. (C) = 0.37
Rainfall Inten (in/hr) = 7.058 Tc by User (min) = 5
IDF Curve = Nesbitt.IDF Rec limb factor = 1.00
Hydrograph Volume = 799 (cuft); 0.018 (acft)
0 5 10
Q (cfs)
0.00 0.00
1.00 1.00
2.00 2.00
3.00 3.00
Q (cfs)
Time (min)
Runoff Hydrograph
10-yr frequency
Runoff Hyd - Qp = 2.66 (cfs)
North American Green
5401 St. Wendel-Cynthiana Rd.
Poseyville, Indiana 47633
Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v6.0
CHANNEL ANALYSIS
> > > Permanent Ditch 3
Name Permanent Ditch 3
Discharge 2.66
Peak Flow Period 10
Channel Slope 0.0825
Channel Bottom Width 0
Left Side Slope 3
Right Side Slope 3
Low Flow Liner
Retardence Class C 6-12 in
Vegetation Type Sod Former
Vegetation Density Good 75-95%
Soil Type Silt Loam
SC250 - Class C - Sod Former - Good 75-95%
SC250
Unvegetated
Straight 2.66 cfs 3.95 ft/s 0.47 ft 0.04 2.5 lbs/ft2 2.44 lbs/ft2 1.02 STABLE E
SC250
Reinforced
Vegetation
Straight 2.66 cfs 1.91 ft/s 0.68 ft 0.106 8 lbs/ft2 3.51 lbs/ft2 2.28 STABLE E
Underlying
Substrate
Straight 2.66 cfs 1.91 ft/s 0.68 ft -- 0.8 lbs/ft2 0.05 lbs/ft2 14.69 STABLE --
Phase Reach Discharge Velocity Normal Depth Mannings N Permissable Shear
Stress
Calculated Shear
Stress
Safety
Factor
Remarks Staple
Pattern
ECMDS 6.0 https://ecmds.com/project/136581/channel-analysis/143894/show
1 of 1 6/13/2018, 2:56 PM
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Wednesday, Jun 13 2018
Permanent Diversion Ditch #3
Triangular
Side Slopes (z:1) = 3.00, 3.00
Total Depth (ft) = 1.00
Invert Elev (ft) = 2140.00
Slope (%) = 8.25
N-Value = 0.025
Calculations
Compute by: Known Q
Known Q (cfs) = 2.66
Highlighted
Depth (ft) = 0.40
Q (cfs) = 2.660
Area (sqft) = 0.48
Velocity (ft/s) = 5.54
Wetted Perim (ft) = 2.53
Crit Depth, Yc (ft) = 0.55
Top Width (ft) = 2.40
EGL (ft) = 0.88
0 1 2 3 4 5 6 7 8
Elev (ft) Depth (ft)Section
2139.50 -0.50
2140.00 0.00
2140.50 0.50
2141.00 1.00
2141.50 1.50
2142.00 2.00
Reach (ft)
Hydrology Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Wednesday, Jun 13 2018
Permanent Ditch #4 Hydrology
Hydrograph type = Rational Peak discharge (cfs) = 3.648
Storm frequency (yrs) = 10 Time interval (min) = 1
Drainage area (ac) = 0.680 Runoff coeff. (C) = 0.76
Rainfall Inten (in/hr) = 7.058 Tc by User (min) = 5
IDF Curve = Nesbitt.IDF Rec limb factor = 1.00
Hydrograph Volume = 1,094 (cuft); 0.025 (acft)
0 5 10
Q (cfs)
0.00 0.00
1.00 1.00
2.00 2.00
3.00 3.00
4.00 4.00
Q (cfs)
Time (min)
Runoff Hydrograph
10-yr frequency
Runoff Hyd - Qp = 3.65 (cfs)
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Wednesday, Jun 13 2018
Permanent Diversion Ditch #4
Triangular
Side Slopes (z:1) = 3.00, 3.00
Total Depth (ft) = 1.00
Invert Elev (ft) = 2149.00
Slope (%) = 2.00
N-Value = 0.025
Calculations
Compute by: Known Q
Known Q (cfs) = 3.65
Highlighted
Depth (ft) = 0.59
Q (cfs) = 3.650
Area (sqft) = 1.04
Velocity (ft/s) = 3.50
Wetted Perim (ft) = 3.73
Crit Depth, Yc (ft) = 0.63
Top Width (ft) = 3.54
EGL (ft) = 0.78
0 1 2 3 4 5 6 7 8
Elev (ft) Depth (ft)Section
2148.50 -0.50
2149.00 0.00
2149.50 0.50
2150.00 1.00
2150.50 1.50
2151.00 2.00
Reach (ft)
Hydrology Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Wednesday, Jun 13 2018
Permanent Ditch #5 Hydrology
Hydrograph type = Rational Peak discharge (cfs) = 3.529
Storm frequency (yrs) = 10 Time interval (min) = 1
Drainage area (ac) = 1.000 Runoff coeff. (C) = 0.5
Rainfall Inten (in/hr) = 7.058 Tc by User (min) = 5
IDF Curve = Nesbitt.IDF Rec limb factor = 1.00
Hydrograph Volume = 1,059 (cuft); 0.024 (acft)
0 5 10
Q (cfs)
0.00 0.00
1.00 1.00
2.00 2.00
3.00 3.00
4.00 4.00
Q (cfs)
Time (min)
Runoff Hydrograph
10-yr frequency
Runoff Hyd - Qp = 3.53 (cfs)
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Wednesday, Jun 13 2018
Permanent Diversion Ditch #5
Triangular
Side Slopes (z:1) = 3.00, 3.00
Total Depth (ft) = 1.00
Invert Elev (ft) = 2158.00
Slope (%) = 3.11
N-Value = 0.025
Calculations
Compute by: Known Q
Known Q (cfs) = 3.53
Highlighted
Depth (ft) = 0.54
Q (cfs) = 3.530
Area (sqft) = 0.87
Velocity (ft/s) = 4.04
Wetted Perim (ft) = 3.42
Crit Depth, Yc (ft) = 0.62
Top Width (ft) = 3.24
EGL (ft) = 0.79
0 1 2 3 4 5 6 7 8
Elev (ft) Depth (ft)Section
2157.50 -0.50
2158.00 0.00
2158.50 0.50
2159.00 1.00
2159.50 1.50
2160.00 2.00
Reach (ft)
Hydrology Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Wednesday, Jun 13 2018
Permanent Ditch #6 Hydrology
Hydrograph type = Rational Peak discharge (cfs) = 2.257
Storm frequency (yrs) = 10 Time interval (min) = 1
Drainage area (ac) = 0.820 Runoff coeff. (C) = 0.39
Rainfall Inten (in/hr) = 7.058 Tc by User (min) = 5
IDF Curve = Nesbitt.IDF Rec limb factor = 1.00
Hydrograph Volume = 677 (cuft); 0.016 (acft)
0 5 10
Q (cfs)
0.00 0.00
1.00 1.00
2.00 2.00
3.00 3.00
Q (cfs)
Time (min)
Runoff Hydrograph
10-yr frequency
Runoff Hyd - Qp = 2.26 (cfs)
North American Green
5401 St. Wendel-Cynthiana Rd.
Poseyville, Indiana 47633
Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v6.0
CHANNEL ANALYSIS
> > > Permanent Ditch 6
Name Permanent Ditch 6
Discharge 2.26
Peak Flow Period 10
Channel Slope 0.089
Channel Bottom Width 0
Left Side Slope 3
Right Side Slope 3
Low Flow Liner
Retardence Class C 6-12 in
Vegetation Type Sod Former
Vegetation Density Good 75-95%
Soil Type Silt Loam
SC250 - Class C - Sod Former - Good 75-95%
SC250
Unvegetated
Straight 2.26 cfs 3.9 ft/s 0.44 ft 0.04 2.5 lbs/ft2 2.44 lbs/ft2 1.02 STABLE E
SC250
Reinforced
Vegetation
Straight 2.26 cfs 1.82 ft/s 0.64 ft 0.111 8 lbs/ft2 3.58 lbs/ft2 2.24 STABLE E
Underlying
Substrate
Straight 2.26 cfs 1.82 ft/s 0.64 ft -- 0.8 lbs/ft2 0.05 lbs/ft2 15.23 STABLE --
SC150
SC150
Unvegetated
Straight 2.26 cfs 3.3 ft/s 0.48 ft 0.05 2 lbs/ft2 2.66 lbs/ft2 0.75 UNSTABLE E
Unreinforced Vegetation - Class C - Sod Former - Good 75-95%
Unreinforced
Vegetation
Straight 2.26 cfs 1.82 ft/s 0.64 ft 0.111 4.2 lbs/ft2 3.58 lbs/ft2 1.17 STABLE --
Underlying
Substrate
Straight 2.26 cfs 1.82 ft/s 0.64 ft -- 0.04 lbs/ft2 0.01 lbs/ft2 3.79 STABLE --
Phase Reach Discharge Velocity Normal Depth Mannings N Permissable Shear
Stress
Calculated Shear
Stress
Safety
Factor
Remarks Staple
Pattern
Phase Reach Discharge Velocity Normal Depth Mannings N Permissable Shear
Stress
Calculated Shear
Stress
Safety
Factor
Remarks Staple
Pattern
Phase Reach Discharge Velocity Normal Depth Mannings N Permissable Shear
Stress
Calculated Shear
Stress
Safety
Factor
Remarks Staple
Pattern
ECMDS 6.0 https://ecmds.com/project/136581/channel-analysis/143896/show
1 of 1 6/13/2018, 2:55 PM
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Wednesday, Jun 13 2018
Permanent Diversion Ditch #6
Triangular
Side Slopes (z:1) = 3.00, 3.00
Total Depth (ft) = 1.00
Invert Elev (ft) = 2148.77
Slope (%) = 8.90
N-Value = 0.025
Calculations
Compute by: Known Q
Known Q (cfs) = 2.26
Highlighted
Depth (ft) = 0.37
Q (cfs) = 2.260
Area (sqft) = 0.41
Velocity (ft/s) = 5.50
Wetted Perim (ft) = 2.34
Crit Depth, Yc (ft) = 0.52
Top Width (ft) = 2.22
EGL (ft) = 0.84
0 1 2 3 4 5 6 7 8
Elev (ft) Depth (ft)Section
2148.00 -0.77
2148.50 -0.27
2149.00 0.23
2149.50 0.73
2150.00 1.23
Reach (ft)
Hydrology Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Wednesday, Jun 13 2018
Permanent Ditch #7 Hydrology
Hydrograph type = Rational Peak discharge (cfs) = 2.863
Storm frequency (yrs) = 10 Time interval (min) = 1
Drainage area (ac) = 0.520 Runoff coeff. (C) = 0.78
Rainfall Inten (in/hr) = 7.058 Tc by User (min) = 5
IDF Curve = Nesbitt.IDF Rec limb factor = 1.00
Hydrograph Volume = 859 (cuft); 0.020 (acft)
0 5 10
Q (cfs)
0.00 0.00
1.00 1.00
2.00 2.00
3.00 3.00
Q (cfs)
Time (min)
Runoff Hydrograph
10-yr frequency
Runoff Hyd - Qp = 2.86 (cfs)
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Wednesday, Jun 13 2018
Permanent Diversion Ditch #7
Triangular
Side Slopes (z:1) = 3.00, 3.00
Total Depth (ft) = 1.00
Invert Elev (ft) = 2157.00
Slope (%) = 2.50
N-Value = 0.025
Calculations
Compute by: Known Q
Known Q (cfs) = 2.86
Highlighted
Depth (ft) = 0.52
Q (cfs) = 2.860
Area (sqft) = 0.81
Velocity (ft/s) = 3.53
Wetted Perim (ft) = 3.29
Crit Depth, Yc (ft) = 0.57
Top Width (ft) = 3.12
EGL (ft) = 0.71
0 1 2 3 4 5 6 7 8
Elev (ft) Depth (ft)Section
2156.50 -0.50
2157.00 0.00
2157.50 0.50
2158.00 1.00
2158.50 1.50
2159.00 2.00
Reach (ft)
Hydrology Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Wednesday, Jun 13 2018
Permanent Ditch #8 Hydrology
Hydrograph type = Rational Peak discharge (cfs) = 1.249
Storm frequency (yrs) = 10 Time interval (min) = 1
Drainage area (ac) = 0.300 Runoff coeff. (C) = 0.59
Rainfall Inten (in/hr) = 7.058 Tc by User (min) = 5
IDF Curve = Nesbitt.IDF Rec limb factor = 1.00
Hydrograph Volume = 375 (cuft); 0.009 (acft)
0 5 10
Q (cfs)
0.00 0.00
1.00 1.00
2.00 2.00
Q (cfs)
Time (min)
Runoff Hydrograph
10-yr frequency
Runoff Hyd - Qp = 1.25 (cfs)
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Wednesday, Jun 13 2018
Permanent Diversion Ditch #8
Triangular
Side Slopes (z:1) = 3.00, 3.00
Total Depth (ft) = 1.00
Invert Elev (ft) = 2146.00
Slope (%) = 10.70
N-Value = 0.025
Calculations
Compute by: Known Q
Known Q (cfs) = 1.25
Highlighted
Depth (ft) = 0.29
Q (cfs) = 1.250
Area (sqft) = 0.25
Velocity (ft/s) = 4.95
Wetted Perim (ft) = 1.83
Crit Depth, Yc (ft) = 0.41
Top Width (ft) = 1.74
EGL (ft) = 0.67
0 1 2 3 4 5 6 7 8
Elev (ft) Depth (ft)Section
2145.50 -0.50
2146.00 0.00
2146.50 0.50
2147.00 1.00
2147.50 1.50
2148.00 2.00
Reach (ft)
Hydrology Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Wednesday, Jun 13 2018
Permanent Ditch #9 Hydrology
Hydrograph type = Rational Peak discharge (cfs) = 4.263
Storm frequency (yrs) = 10 Time interval (min) = 1
Drainage area (ac) = 1.510 Runoff coeff. (C) = 0.4
Rainfall Inten (in/hr) = 7.058 Tc by User (min) = 5
IDF Curve = Nesbitt.IDF Rec limb factor = 1.00
Hydrograph Volume = 1,279 (cuft); 0.029 (acft)
0 5 10
Q (cfs)
0.00 0.00
1.00 1.00
2.00 2.00
3.00 3.00
4.00 4.00
5.00 5.00
Q (cfs)
Time (min)
Runoff Hydrograph
10-yr frequency
Runoff Hyd - Qp = 4.26 (cfs)
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Wednesday, Jun 13 2018
Permanent Diversion Ditch #9
Triangular
Side Slopes (z:1) = 3.00, 3.00
Total Depth (ft) = 1.00
Invert Elev (ft) = 2156.00
Slope (%) = 2.00
N-Value = 0.025
Calculations
Compute by: Known Q
Known Q (cfs) = 4.26
Highlighted
Depth (ft) = 0.62
Q (cfs) = 4.260
Area (sqft) = 1.15
Velocity (ft/s) = 3.69
Wetted Perim (ft) = 3.92
Crit Depth, Yc (ft) = 0.67
Top Width (ft) = 3.72
EGL (ft) = 0.83
0 1 2 3 4 5 6 7 8
Elev (ft) Depth (ft)Section
2155.50 -0.50
2156.00 0.00
2156.50 0.50
2157.00 1.00
2157.50 1.50
2158.00 2.00
Reach (ft)
PHASE I PHASE IPHASE IPHASE IPHASE IIPHASE IIPHASE II PHASE II
ROAD

A ROAD AROAD BROAD D ROAD C18
"

H
D
PE
INV: 2067.2'INV: 2067.2'5' UTILITY EASEMENTPER D.B. 1040, P. 1515' UTILITY EASEMENTPER D.B. 1040, P. 151BUILDINGBUILDINGBUILDINGN1 inch = 150 ft.NCBELS LICENSE #: C-2184
52 WALNUT STREET - SUITE 9
WAYNESVILLE, NC 28786
PHONE [phone]
FAX [phone]
Concepts, PACCDDesignCivil
www.civildesignconcepts.com
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ASHEVILLE, NC 28801
PHONE [phone]
FAX [phone]
NESBITT FARMS - PHASE 1
PHASE I PHASE I PHASE IPHASE IPHASE IPHASE IIPHASE IIPHASE II PHASE II PHASE II
18
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INV: 2067.2'INV: 2067.2'5' UTILITY EASEMENTPER D.B. 1040, P. 1515' UTILITY EASEMENTPER D.B. 1040, P. 151BUILDINGBUILDINGBUILDINGNNESBITT FARMS - PHASE 11 inch = 150 ft.NCBELS LICENSE #: C-2184
52 WALNUT STREET - SUITE 9
WAYNESVILLE, NC 28786
PHONE [phone]
FAX [phone]
Concepts, PACCDDesignCivil
www.civildesignconcepts.com
168 PATTON AVENUE
ASHEVILLE, NC 28801
PHONE [phone]
FAX [phone]
Project Name: Nesbitt Farm
Project #: 21802
Total Project Area:82.03 Acres 3,573,078 SF
Total Maximum Impervious:19.69 Acres 857,539 SF
24 %
Parcel Name Square Feet Acres Perimeter
(FT)
Impervious
Area (SF)Impervious %
Roadway 70,639 1.62 N/A 70,639 100%
Parcel : 1 58,989 1.35 1,078 9,100 15%
Parcel : 2 52,582 1.21 1,032 9,100 17%
Parcel : 3 102,126 2.34 1,268 11,708 11%
Parcel : 4 68,643 1.58 1,249 9,100 13%
Parcel : 5 68,817 1.58 1,155 9,100 13%
Parcel : 6 42,072 0.97 859 9,100 22%
Parcel : 7 38,792 0.89 882 9,100 23%
Parcel : 8 31,605 0.73 715 9,100 29%
Parcel : 9 44,104 1.01 894 9,100 21%
Parcel : 10 54,843 1.26 1,219 9,100 17%
Parcel : 11 30,184 0.69 711 9,100 30%
Parcel : 12 33,739 0.78 815 9,100 27%
Parcel : 13 31,729 0.73 735 9,100 29%
Parcel : 14 30,039 0.69 709 9,100 30%
Parcel : 15 30,039 0.69 709 9,100 30%
Parcel : 16 30,100 0.69 710 9,100 30%
Parcel : 17 30,100 0.69 710 9,100 30%
Parcel : 18 30,100 0.69 710 9,100 30%
Parcel : 19 30,100 0.69 710 9,100 30%
Parcel : 20 36,103 0.83 759 9,100 25%
Parcel : 21 30,100 0.69 710 9,100 30%
Parcel : 22 47,020 1.08 949 9,100 19%
Parcel : 23 43,739 1.00 895 9,100 21%
Parcel : 24 36,599 0.84 1,016 9,100 25%
Parcel : 25 31,240 0.72 729 9,100 29%
Parcel : 26 83,762 1.92 1,592 9,100 11%
Parcel : 27 36,387 0.84 826 9,100 25%
Parcel : 28 37,596 0.86 835 9,100 24%
Parcel : 29 30,450 0.70 730 9,100 30%
Parcel : 30 30,100 0.69 710 9,100 30%
Parcel : 31 32,420 0.74 712 9,100 28%
Total Parcel Area 1,384,859 31.79 N/A 355,347 26%
Total Phase I Area 1,475,543 33.87 N/A 355,347 24%
PHASE I
PARCEL IMPERVIOUS REPORT
Date: 05/21/2018
Total Maximum Impervious Percentage:
Parcel Name Square Feet Acres Perimeter
(ft)
Impervious
Area (SF)Impervious %
Roadway 68,850 1.58 N/A 68,850 100%
Parcel : 32 30,041 0.69 710 9,100 30%
Parcel : 33 30,455 0.70 715 9,100 30%
Parcel : 34 31,179 0.72 726 9,100 29%
Parcel : 35 31,904 0.73 736 9,100 29%
Parcel : 36 32,816 0.75 753 9,100 28%
Parcel : 37 34,356 0.79 790 9,100 26%
Parcel : 38 38,331 0.88 852 9,100 24%
Parcel : 39 37,684 0.87 835 9,100 24%
Parcel : 40 36,911 0.85 793 9,100 25%
Parcel : 41 37,764 0.87 820 9,100 24%
Parcel : 42 49,319 1.13 1,035 9,100 18%
Parcel : 43 32,057 0.74 790 9,100 28%
Parcel : 44 39,166 0.90 807 9,100 23%
Parcel : 45 32,426 0.74 726 9,100 28%
Parcel : 46 30,100 0.69 710 9,100 30%
Parcel : 47 30,100 0.69 710 9,100 30%
Parcel : 48 30,100 0.69 710 9,100 30%
Parcel : 49 30,100 0.69 710 9,100 30%
Parcel : 50 30,100 0.69 710 9,100 30%
Parcel : 51 30,100 0.69 710 9,100 30%
Parcel : 52 30,100 0.69 710 9,100 30%
Parcel : 53 30,100 0.69 710 9,100 30%
Parcel : 54 37,320 0.86 774 9,100 24%
Parcel : 55 35,970 0.83 801 9,100 25%
Parcel : 56 30,100 0.69 710 9,100 30%
Parcel : 57 33,933 0.78 792 9,100 27%
Parcel : 58 59,272 1.36 1,130 9,100 15%
Parcel : 59 71,759 1.65 1,239 9,100 13%
Parcel : 60 30,100 0.69 710 9,100 30%
Parcel : 61 32,095 0.74 770 9,100 28%
Parcel : 62 47,463 1.09 945 9,100 19%
Parcel : 63 32,284 0.74 782 9,100 28%
Parcel : 64 32,284 0.74 782 9,100 28%
Parcel : 65 32,311 0.74 783 9,100 28%
Parcel : 66 30,100 0.69 710 9,100 30%
Parcel : 67 30,100 0.69 710 9,100 30%
Parcel : 68 30,100 0.69 710 9,100 30%
Parcel : 69 30,100 0.69 710 9,100 30%
Parcel : 70 31,975 0.73 779 9,100 28%
Parcel : 71 44,648 1.03 851 9,100 20%
Parcel : 72 38,895 0.89 1,049 9,100 23%
Parcel : 73 115,658 2.66 1,710 9,100 8%
Parcel : 74 72,499 1.66 1,132 5500 8%
Parcel : 75 44,011 1.01 921 9,100 21%
Parcel : 76 46,599 1.07 944 9,100 20%
Parcel : 77 46,340 1.06 940 9,100 20%
Parcel : 78 44,560 1.02 921 9,100 20%
Parcel : 79 45,137 1.04 928 9,100 20%
OPEN SPACE 73,744 1.69 1,272 0 0%
Total Parcel Area 2,003,416 45.99 N/A 502,050 25%
Total Phase II Area 2,097,535 48.15 N/A 502,050 24%
PHASE II
Phase I Area 1,475,543 33.87 N/A 355,347 24%
Phase II Area 2,097,535 48.15 N/A 502,050 24%
Total Project Area 3,573,078 82.03 N/A 857,397 24%
Total Project Area - Impervious Calculations
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NORTH
CAROLINA
QUADRANGLE LOCATION
SKYLAND QUADRANGLE
NORTH CAROLINA
7.5-MINUTE SERIES
SKYLAND, NC
2016
ROAD CLASSIFICATION
Check with local Forest Service unit
for current travel conditions and restrictions.
FS Primary Route FS High
Clearance Route
FS Passenger
Routeª«-▬Interstate Route State RouteUS RouteWX./H
Expressway Local Connector
Ramp 4WD
Secondary Hwy Local Road
U.S. DEPARTMENT OF THE INTERIOR
U.S. GEOLOGICAL SURVEY

1 Enka
8 Hendersonville
2 Asheville
3 Oteen
4 Dunsmore Mountain
5 Fruitland
6 Pisgah Forest
7 Horse Shoe
ADJOINING QUADRANGLES
123
45
678
This map was produced to conform with the
National Geospatial Program US Topo Product Standard, 2011.
A metadata file associated with this product is draft version 0.6.19
CONTOUR INTERVAL 20 FEET
NORTH AMERICAN VERTICAL DATUM OF 1988
SCALE 1:24 000
1000 500 0 METERS 1000 2000
21KILOMETERS00.51
10.50
MILES
1
1000 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
FEET
North American Datum of 1983 (NAD83)
World Geodetic System of 1984 (WGS84). Projection and
1 000-meter grid: Universal Transverse Mercator, Zone 17S
Produced by the United States Geological Survey
10 000-foot ticks: North Carolina Coordinate System of 1983
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reservations may not be shown. Obtain permission before
entering private lands.
Imagery.............................................NAIP, October 2014
Roads................................ U.S. Census Bureau, 2015 - 2016
Roads within US Forest Service Lands.............FSTopo Data
with limited Forest Service updates, 2012 - 2016
Names...............................................................GNIS, 2016
Hydrography....................National Hydrography Dataset, 2014
Contours............................National Elevation Dataset, 2008
Boundaries............Multiple sources; see metadata file 1972 - 2016
Wetlands.........FWS National Wetlands Inventory 1977 - 2014
U.S. National Grid
100,000-m Square ID
Grid Zone Designation
LV
17S
^
ØMN
GN
UTM GRID AND 2016 MAGNETIC NORTHDECLINATION AT CENTER OF SHEET
0° 54´
16 MILS
6° 31´116 MILS
*7643016379224*NSN.7643016379224NGA REF NO.USGSX24K41640