20181296 Ver 1_SW Impact Analysis_20180924

Stormwater Impact Analysis
SCM Report
For the proposed
North Carolina Agricultural Sciences Center
Raleigh, North Carolina
Prepared for
The State of North Carolina
Prepared By
Stewart Inc.
STEWART
September 21, 2018

Stormwater Impact Analysis
for
North Carolina Agricultural Science Center
Raleigh, North Carolina
Prepared for:
The State of North Carolina
Prepared by:
Stewart Inc.
Firm License No. 1051
223 S. West Street, Suite 1100
Raleigh, NC 27603
919.380.8750
�H'GARO��i��.
SEAL
_
03:377PP
Zc��� itj
FOR REVIEW ONLY
Stewart Project No. C16123
September 21, 2018

Table of Contents
1. Narrative
2. Site Information
a. Aerial Map
b. QUAD Map
c. FEMA Map
d. Soils Map
e. Rainfall Data
3. Stormwater Calculations
a. Bioretention Sizing
b. Peak Flow Analysis -Storm and Sanitary Analysis
c. Riprap Dissipater Pad Sizing
d. Nitrogen Calculations
4. Stormwater Drawings
a. SW1.0- Pre -Development Land Use
b. SW2.0- Post -Development Land Use
c. SW3.0- Pre -Development Drainage Area
d. SW4.0- Post -Development Drainage Area
5. Erosion Control Calculations
a. Diversion Ditch Calculations
b. Skimmer Sedimentation Basin Sizing
c. Slope Drain Sizing Calculations
d. Rip Rap Dissipater Sizing
6. HGLs
a. Stormwater 10 -year HGLs
b. Stormwater 25 -year HGLs
7. Seasonally High Water Table Report

STORMWATER IMPACT ANALYSIS
NORTH CAROLINA AGRICULTURAL SCIENCES CENTER
RALEIGH, NORTH CAROLINA
EXECUTIVE SUMMARY
This Stormwater Impact Analysis has been prepared specifically to address the
requirements of the State of North Carolina's Stormwater Design Manual to
quantify the impact of the proposed development's effect upon nutrient levels on
downstream systems. Specifically, the Neuse River Buffer Rule (15A NCAC
02B.0233) requires that diffuse flow be provided into Zone 2 of the buffer
associated with the stream adjacent to the proposed development. The stream is a
tributary of Macon Pond which flows into Richland Creek. The stream is subject to
the Neuse River Buffer Rules because it is depicted on the latest 1:24,000 (7.5
minute) United States Geologic Survey (USGS) and the soil survey map prepared
by the Natural Resource Conservation Service. Per the State of North Carolina's
Stormwater Design Manual, as a Low -Density development, the post -development
10 -year, 24-hour storm event must be safely conveyed in a vegetated channel in
such a way that it does not cause erosion. The Total Nitrogen Export for the site
must also be held to 3.6 lbs/ac/yr.
The Total Nitrogen Export (TNE) from the site was calculated using the apportioning
method to calculate the nutrient impacts on the site. Using this method, the "area
of new development" is 38.70 ac (7.076 ac of additional impervious and 31.63 ac of
apportioned open space). The THE for the "area of new development" is 4.86
Ib/ac/yr. This export was reduced to 3.41 Ib/ac/yr (meeting the export threshold of
3.6 Ib/ac/yr) by treatment of a 7.117 ac of impervious area at 35% removal rate.
As is detailed below, there are three points of analysis for this site. The peak flow
rate in the post -development condition is 62.69 cfs, 6.50 cfs, and 15.34 cfs, at the
north, east, and south outlets respectively for the 10 -year, 24-hour event. All
analysis points are proposed to be fitting with oversized riprap dissipation pads to
provide further velocity reduction.
Site Information
The proposed North Carolina Agricultural Sciences Building will be located in
Raleigh, Northeast of downtown toward William B. Umstead State Park. Currently
the site consists of 1074 acres which contain forest, pasture lands, and minimal
impervious. Numerous State-owned buildings dot the property, including Prairie
Ridge Ecostation and motor fleet management. Only a fraction of the parcel will be
used for the proposed development, which will sit on 40.12 acres at the corner of
Edwards Mill and Reedy Creek Rd. This area of 40.12 acres is considered the
NNproject area" for low-density development calculations.

Figure 1.0 - Vicinity Map for the Proposed Agricultural Sciences Center
This analysis is for the proposed improvements to the site, which will include
bioswales in multiple locations to treat stormwater runoff. Additionally, a
bioretention cell located in the northeastern quadrant of the site will treat an 8.93 -
acre drainage area with 62.8% of the area being impervious surfaces. A stepped
bioswale in the southeastern quadrant will be used to treat 2.49 -acres, 60.3% of
the area being impervious surfaces. In the predevelopment condition there are
11,250 sf (0.25 ac) of impervious area, resulting in 0.644% impervious in the
40.12 acre project area. In the proposed condition there are 319,615 sf (7.34 ac) of
impervious area, resulting in 18.29% impervious in the 40.12 acre project area.
This is within the allowed 24% impervious for low-density development.
The site is within the Neuse River Basin and drains to the Richland Creek
watershed. The property is not within a noted FEMA Floodplain. The Wake County
Soil Survey Map indicates the soils on site consist mainly of sandy loams, which are
classified as Hydrologic Soil Group B.

Proposed Improvements
The proposed improvements associated with this project include a 220,000 SF
science building which will include labs and offices for five State agencies within the
Department of Agriculture. Additionally, there will be parking lots for the building,
and a loop road which will provide connectivity between the proposed parking lots
and Reedy Creek Rd.
The runoff from two-thirds of the roof and parking lots, as well as much of the road,
will be directed to the proposed bioretention area. Some runoff from the parking
lots located north of the building will first be directed to bioswale to be located
between parking aisles before being directed to the bioretention area via a series of
stormwater pipes. Stormwater runoff from the remaining third of the building and
parking lots will be directed to the proposed stepped bioswale facing Reedy Creek
Rd.
Overall Results / Summary
Peak Flow Analysis
The table below includes the pre- and post -development peak flow for the 1" -
water quality storm, 2 -year, 5 -year, 10 -year, and 25 -year, 24-hour storms and the
associated percent increases. The peak flow in the proposed condition is increased
for all storms at the northern and southern analysis points. See Appendix 3 for
detailed calculations.
Table 1.0 - Pre and Post Peak Flow Rates:
Peak Flow Summary Table (cf/ sec)
PRE
POST
STORM EVENT
DRAINAGE AREA
w/o detention
w/ detention
DIFF
NORTH
0.01
4.65
0.01
0%
1" - WQ
EAST
0.00
0.00
-
SOUTH
0.50
1.08
0.54
8%
NORTH
12.51
35.46
32.58
160%
2 -YR
EAST
5.50
3.00
-
-45%
SOUTH
8.06
15.27
8.10
0%
NORTH
23.79
50.95
49.34
107%
5 -YR
EAST
9.69
4.87
-
-50%
SOUTH
12.85
21.31
12.19
-5%
NORTH
34.17
64.88
62.69
83%
10 -YR
EAST
10.70
6.50
-
-39%
SOUTH
17.03
22.52
15.34
-10%
NORTH
45.27
75.22
70.98
57%
25 -YR
EAST
10.70
8.14
-
-24%
SOUTH
20.49
23.73
18.99
-7%

Table 2.0 - Pre and Post Peak Velocity:
Engineer's Conclusion
Because of the increase in the peak flows from the new development, a bioretention
device will be used in the northern portion of the site to provide peak flow
attenuation and meet diffuse flow requirements into zone 2 of the stream. The peak
flow in the southern part of the property is proposed to be mitigated by a stepped
bioswale and, as is shown in table 1.0. Each drainage area has been designed to
utilize vegetated conveyance to not produce erosive velocities. All peak flow
calculations have been included within this report.
Submitted 21st day of September 2018 by STEWART
Joseph Puckett, PE
Velocity Summary Table (ft/sec)
PRE
POST
STORM EVENT
DRAINAGE AREA
w/o detention
w/ detention
% DIFF
NORTH
0
2.57
0
1" - WQ
EAST
0
0
SOUTH
3.99
5.35
4.53
14%
NORTH
3.61
4.54
4.45
23%
2 -YR
EAST
4.28
3.82
-11
SOUTH
8.56
10.82
9.4
10%
NORTH
4.36
4.98
4.94
13%
5 -YR
EAST
5.11
4.46
-13
SOUTH
9.52
11.54
10.3
8%
NORTH
4.84
5.3
5.25
8%
10 -YR
EAST
5.27
4.87
-8%
SOUTH
10.09
11.66
10.82
7%
NORTH
5.23
5.49
5.41
3%
25 -YR
EAST
5.27
5.22
-1
SOUTH
10.47
11.76
11.31
8%
Engineer's Conclusion
Because of the increase in the peak flows from the new development, a bioretention
device will be used in the northern portion of the site to provide peak flow
attenuation and meet diffuse flow requirements into zone 2 of the stream. The peak
flow in the southern part of the property is proposed to be mitigated by a stepped
bioswale and, as is shown in table 1.0. Each drainage area has been designed to
utilize vegetated conveyance to not produce erosive velocities. All peak flow
calculations have been included within this report.
Submitted 21st day of September 2018 by STEWART
Joseph Puckett, PE

Appendix 2
Site Information
a. Aerial Map
b. QUAD Map
c. FEMA Map
d. Soils Map
e. Rainfall Data

-5 -usGs
science for a changing world
U.S. DEPARTMENT OF THE INTERIOR
U. S. GEOLOGICAL SURVEY
Produced by the United States Geological Survey
North American Datum of 1983 (NAD83)
World Geodetic System of 1984 (WG S84). Projection and
1 DOD -meter grid: Universal Transverse Mercator, Zane 17S
10 ODO-foot ticks: North Carolina Coordinate System of 1983
Imagery ...................................................NAI
P, May 2012
Roads..............................................®2006-2012
TomTom
Names..........................................................GNIS,
2013
Hydrography ....................National
Hydrography Dataset, 2012
Contours............................National
Elevation Dataset, 2008
Boundaries ....................Census,
IBWC, IBC, USGS, 1972 - 2012
H
A
lr
QUADRANGLE LOCATION
Southeast
Bayleat.
Wake
tlurbam
Forest
Raleigh
Raleigh
Cary
West
Fast
Apex
Garner
Whheeeler
ADJOINING 7.5' QUADRANGLES
9° 4' 'f
161 MILS op
1° 21'
24 MILS
UTM GRID AND 2013 MAGNETIC NORTH
DECLINATION AT CENTER OF SHEET
U.S. National Grid
140,000-m Square ID
QV
Grid Zone Desigmtim
17S
This map was produced to conform with the
National Goes pati al. Program US Top Product Standard, 2011.
A metadata fila associated with this product is draft version 0.6.11
SCALE 1:24 000
3567
N6V
3965
The National Map
US Top
1 705 '0
RALEIGH WEST QUADRANGLE
NORTH CAROLINA -WAKE CO.
7.5 -MINUTE SERIES
42'30"
1 0.5 0 KILOMETERS 1 2
1000 500 0 METERS 1000 2000
1 0.5 0 1
MILES
1000 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
FEFT
CONTOUR INTERVAL 10 FEET
NORTH AMERICAN VERTICAL DATUM OF 1988
ROAD CLASSIFICATION
Expressway Local Connector
Secondary Hwy Local Road
Ramp 4WD
10 Interstate Route C3 US Route 0 State Route
RALEIGH WEST, NC
2013

/ �rV
WAKE COUNTY.
CITY. OF RALEIGH W
4
GRID NORTH
MAP SCALE 1" = 500' (1 : 6,000)
250 0 500 1000
FEET
IIII!,I.F�Il1�PN
PANEL 078511
FIRM
FLOOD INSURANCE RATE MAP
NORTH CAROLINA
PANEL 0785
(SEE LOCATOR DIAGRAM OR MAP INDEX FOR FIRM
PANEL LAYOUT)
CONTAINS:
COMMUNITY CID No. PANEL SUFFIX
RALEIGH, CITY OF 370243 0785 J
WAKE COUNTY 370388 0785 J
Notice to User: The Map Number shown below should be used
when placing map orders: the Community Number shown
above should be used on insurance applications for the subject
community.
EFFECTIVE DATE
MAP NUMBER
MAY 2, 2006
3720078500)
v
CO.
4AGNp sdoJ�
State of North Carolina
Federal Emergency Management Agency
This is an official copy of a portion of the above referenced flood map. It
was extracted using F-MITOn-Line. This map does not reflect changes
or amendments which may have been made subsequent to the date on the
title block. For the latest product information about National Flood Insurance
Program flood maps check the FEMA Flood Map Store at www.msc.fema.gov

3 Hydrologic Soil Group—Wake County, North Carolina 3
M (Co-Located Labs)
705200 706300 706400 706500 706600 706700 706800 706900 707000
350 49'17'N 350 49'17'N
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705100 706300 706400 706500 706600 706700 706800 700000 707000
3 3
a
Map Scale: 1:5,830 if printed on A portrait (8.5" x 11") sheet
Meters
N 0 50 100 200 300
Feet
0 250 500 1000 1500
Map projection: Web Mercator Comer coordinates: WGS84 Edge tics: UTM Zone 17N WGS84
US�D4 Natural Resources Web Soil Survey 12/29/2016
�m Conservation Service National Cooperative Soil Survey Page 1 of 4

Hydrologic Soil Group—Wake County, North Carolina
(Co -Located Labs)
MAP LEGEND
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
0 A
0 A/D
0 B
0 B/D
C
0 C/D
0 D
Not rated or not available
Soil Rating Lines
r r A
r r
A/D
r B
B/D
r r C
0 C/D
r r D
r r Not rated or not available
Soil Rating Points
0 A
0 A/D
■ B
■ B/D
MAP INFORMATION
p C
The soil surveys that comprise your AOI were mapped at
1:15,800.
0 C/D
0 D
Warning: Soil Map may not be valid at this scale.
p Not rated or not available
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
Water Features
line placement. The maps do not show the small areas of
Streams and Canals
contrasting soils that could have been shown at a more detailed
scale.
Transportation
§_§_+ Rails
Please rely on the bar scale on each map sheet for map
#%-0 Interstate Highways
measurements.
US Routes
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Major Roads
Coordinate System: Web Mercator (EPSG:3857)
Local Roads
Maps from the Web Soil Survey are based on the Web Mercator
Background
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
® Aerial Photography
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Wake County, North Carolina
Survey Area Data: Version 15, Sep 19, 2016
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Apr 27, 2014—May
6, 2014
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
UUP Natural Resources Web Soil Survey 12/29/2016
� Conservation Service National Cooperative Soil Survey Page 2 of 4

Hydrologic Soil Group -Wake County, North Carolina
Hydrologic Soil Group
Co -Located Labs
Hydrologic Soil Group- Summary by Map Unit - Wake County, North Carolina (NC183)
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
AgC2
Appling gravelly sandy
B
0.1
0.1%
loam, 6 to 10 percent
slopes, moderately
eroded
ApB
Appling sandy loam, 2 to
B
10.2
10.1%
6 percent slopes
ApC
Appling sandy loam, 6 to
B
7.2
7.1%
10 percent slopes
ApC2
Appling sandy loam, 6 to
B
1.6
1.5%
10 percent slopes,
moderately eroded
ApD
Appling sandy loam, 10
B
8.4
8.3%
to 15 percent slopes
CeD
Cecil sandy loam, 10 to
A
17.2
17.0%
15 percent slopes
CgB2
Cecil gravelly sandy
B
24.0
23.7%
loam, 2 to 6 percent
slopes, moderately
eroded
CgC2
Cecil gravelly sandy
B
18.2
17.9%
loam, 6 to 10 percent
slopes, moderately
eroded
CmA
Chewacla sandy loam, 0
B/D
0.5
0.5%
to 2 percent slopes,
frequently flooded
CnA
Colfax sandy loam, 0 to
C/D
0.0
0.0%
3 percent slopes
MeA
Mantachie sandy loam,
B/D
4.9
4.8%
0 to 2 percent slopes,
rarely flooded
PaF
Pacolet sandy loam, 15
B
1.5
1.5%
to 45 percent slopes
W
Water
2.6
2.6%
WmE
Wedowee sandy loam,
B
1.4
1.4%
15 to 25 percent
slopes
WyA
Worsham sandy loam, 0
D
3.6
3.5%
to 3 percent slopes
Totals for Area of Interest
101.5
100.0%
USDA Natural Resources Web Soil Survey 12/29/2016
Conservation Service National Cooperative Soil Survey Page 3 of 4

Hydrologic Soil Group—Wake County, North Carolina
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long -duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink -swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff. None Specified
Tie-break Rule: Higher
Co -Located Labs
usDA Natural Resources Web Soil Survey 12/29/2016
Conservation Service National Cooperative Soil Survey Page 4 of 4

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Precipitation Frequency Data Server
Page 1 of 4
NOAA Atlas 14, volume 2, version 3
' Location name: Raleigh, North Carolina, USA*
Latitude: 35.8168°, Longitude: -78.7163°
recurrence interval (years)
Elevation: 431.31 ft**
source: ESRI Maps
'0
" source: USGS
25
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M. Bonnin, D. Martin, B. Lin, T. Parzybok, M.Yekta, and D. Riley
NOAH, 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)1
Average
recurrence interval (years)
Duration�2
�
10
25
50
100
200
500
1000
0.399
0.467
0.537
0.596
0.657
0.701
0.741 -IF
-0--7-7-4-T-0--8-11
0.840
5 -min
1(0.367-0.435)1(0.429-0.510)1(0.494-0.586)1(0.547-0.649
(0.600-0.715)
(0.637-0.763)
(0.669-0.805)
(0.696-0.843)
(0.723-0.883)
(0.742-0.916)
0.638
0.747
0.861
0.953 IF
1.05
1.12
1.18
1.23
1.28
1.32
10 -min
1(0.585-0.695)1(0.686-0.815)1(0.791-0.938)1(0.874-1.04)
(0.956-1.14)
1 (1.01-1.21)
1 (1.06-1.28)
1 (1.10-1.34)
1 (1.14-1.40)
1 (1.17-1.44)
0.797
0.939
1.09
1.21
1.33
1.41
1.49
1.55
1.61
1.66
15 -min
1(0.732-0.869)1(0.862-1.02)
1 (1.00-1.19)
1 (1.11-1.31)
1 (1.21-1.44)
1 (1.29-1.54)
1 (1.34-1.62)
1 (1.39-1.69)
1 (1.44-1.76)
1 (1.47-1.81)
1.09
1.30
1.55
1.75
1.97
2.13
2.28
2.41
2.57
2.69
30 -min
(1.00-1.19)
1 (1.19-1.42)
1 (1.42-1.69)
1 (1.60-1.90)
1 (1.80-2.14)
1 (1.94-2.32)
1 (2.06-2.48)
1 (2.17-2.63)
1 (2.29-2.80)
1 (2.38-2.93)
1.36
1.63
1.98
2.28
2.62
2.89
3.14
3.38
3.69
3.92
60 -min
(1.25-1.49)
1 (1.49-1.78)
1 (1.82-2.16)
(2.09-2.48)
(2.39-2.85)
(2.62-3.14)
(2.84-3.41)
1 (3.04-3.68)
1 (3.29-4.01)
(3.47-4.28)
1.59
1.90
2.34
2.70
3.15
3.51
3.86
4.20
4.65
5.00
2 -hr
(1.45-1.74)
(1.73-2.08)
(2.13-2.56)
(2.45-2.96)
(2.84-3.44)
(3.16-3.83)
(3.44-4.21)
(3.73-4.59)
(4.09-5.07)
(4.37-5.47)
3 -hr
(1. 46884)
(1.8402.21
2.274973
2. 3$817)
(3. 843.72)
(3. 5$4.19
3.804.65)
(4.167012
4.625.75)
4. 976.29
2.02
2.43
3.00
3.49
4.13
4.67
5.21
5.76
6.51
7.13
6 -hr
(1.86-2.21)
1 (2.23-2.66)
1 (2.75-3.28)
1 (3.19-3.81)
1 (3.75-4.50)
1 (4.22-5.07)
1 (4.66-5.65)
1 (5.10-6.25)
(5.69-7.05)
(6.17-7.74)
2.39
2.87
3.56
4.17
4.97
5.65
6.34
7.07
8.07
8.92
12 -hr
(2.20-2.61)
(2.64-3.13)
(3.27-3.88)
(3.81-4.55)
(4.51-5.40)
(5.09-6.11)
(5.65-6.86)
1 (6.23-7.63)
(7.00-8.70)
(7.62-9.62)
2.86
3.45
4.32
5.01
5.94
6.68
7.43
8.20
9.26
10.1
24 -hr
(2.6 6-3.07)
(3.22-3.71)
(4.03-4.65)
(4.66-5.38)
(5.51-6.38)
(6.18-7.17)
(6.86-7.99)
(7.56-8.83)
(8.49-9.98)
(9.22-10.9)
9.
2 -day
3.072354
3. 094.27
4. 095.31
5. 966.11
6. 277.21
6. 458.07
7. 838.95
8. 279.86
9.4 213.1
1027 2.1
3 -day
(3. 64375)
(3.927 4.50)
(4.847 5.57)
(5. 696.40)
(6. 307.54)
(7. 968.44)
(8.0579.36)
(8.836 0.3)
(9.88-181.6)
(10.77 2.6)
3.69
4.42
5.45
6.26
7.36
8.23
9.12
10.0
11.3
12.2
4 -day
(3.45-3.95)
1 (4.13-4.73)
1 (5.09-5.83)
1 (5.84-6.70)
1 (6.84-7.88)
1 (7.64-8.81)
1 (8.43-9.77)
1 (9.25-10.8)
1 (10.3-12.1)
1 (11.2-13.2)
7 -day
4.28
(4.01-4.56)
5.10
1 (4.78-5.44)
6.21
1 (5.82-6.62)
7.09
(6.63-7.55)
8.28
(7.73-8.83)
9.23
(8.59-9.84)
10.2
(9.46-10.9)
11.2
1 (10.3-12.0)
12.6
(11.5-13.4)
13.6
(12.5-14.6)
-----]F-----]F--6.96.
7.88
9.11
10.1
11.1
12.1
13.4
14.4
10 -day
4.58-5.20
5.44-6.18
6.53-7.42
7.38-8.39
8.52-9.71
9.40-10.7
10.3-11.8
11.2-12.9
12.4-14.3
13.3-15.5
20
6.52
7.70
9.09
10.2
11.7
12.9
14.0
15.2
16.9
18.1
-day
(6.14-6.95)
(7.24-8.20)
(8.54-9.69)
(9.57-10.9)
(10.9-12.5)
(12.0-13.7)
(13.1-15.0)
(14.2-16.3)
(15.6-18.0)
(16.7-19.4)
8.09
9.52
11.1
12.3
13.9
15.1
16.3
17.5
19.1
20.3
30 -day
(7.63-8.60)
(8.97-10.1)
(10.4-11.8)
(11.5-13.0)
(13.0-14.7)
(14.1-16.0)
(15.2-17.3)
(16.3-18.6)
(17.7-20.4)
(18.8-21.7)
45
-10-.3--]F-12.1F--13-.8-]F-15.2F--16-.9---IF--18-.3-]F-19.6
20.8
22.5
23.8
-day
(9.81-10.9)
(11.5-12.8)
1 (13.1-14.6)
1 (14.4-16.0)
1 (16.0-17.9) 11
(17.3-19.3)
(18.4-20.7)
(19.6-22.0)
1 (21.1-23.9)
1 (22.2-25.2)
12.4
14.5
16.3
17.8
19.7
21.1
22.4
23.7
25.4
26.7
60 -day
(118-13.0)
(13.7-15.2)(15.5-17.2)
(16.9-18.7) J
(18.6-20.7) J
(19.9-22.2)
(21.1-23.7)
(22.3-25.1)
(23.9-26.9)
(25.0-28.3)
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.
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Precipitation Frequency Data Server
PF graphical
POS -based depth -duration -frequency (PDF) curves
Latitude: 35.81681. Longitude: -78.7163°
25
_G
L 20
30
25
C
L 20
CL
v
a 15
CL
Lp 10
R
CL
5 -
0
1 2 5 10 25 50 100 200 500 1000
Average recurrence interval (years)
NOAA Atlas 14, Volume 2, version 3 Created (6MTY Tue Mar 20 18:43:13 2018
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Page 2 of 4
Average recurrence
interval
(years)
— 1
2
- 5
— 10
25
50
100
200
500
1000
Duration
— 5 -min
— 2 -day
— 10-rnn
— 3 -day
15 -mm
— 4 -day
— 30-rnin
— 7 -day
— 60 -min
— 70 -day
— 2 -hr
E
E
E
E
rC
— 12 -hr
50 -day
— 24 -hr
ry M1rl
ry
N rh 4
�n 9
4 o4
In
ff�
e-0
N R
I
Duration
30
25
C
L 20
CL
v
a 15
CL
Lp 10
R
CL
5 -
0
1 2 5 10 25 50 100 200 500 1000
Average recurrence interval (years)
NOAA Atlas 14, Volume 2, version 3 Created (6MTY Tue Mar 20 18:43:13 2018
Back to Top
Page 2 of 4
Average recurrence
interval
(years)
— 1
2
- 5
— 10
25
50
100
200
500
1000
Duration
— 5 -min
— 2 -day
— 10-rnn
— 3 -day
15 -mm
— 4 -day
— 30-rnin
— 7 -day
— 60 -min
— 70 -day
— 2 -hr
— 20 -day
— "r
— 30 -Cay
— 6-rsr
— 45 -nay
— 12 -hr
50 -day
— 24 -hr
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Precipitation Frequency Data Server
Maps & aerials
Small scale terrain
Cary
Large scale terrain
Nor
=n -Salem 0
• . Uurham Rocky Mount
Greensboro �kWei h •
a` 9
LTH CAROLINA I `Greenville��
`Charlotte +
Fayetteville,, _
100km Ja[ksonvi e
1 � •
60mi
Large scale map
hunt
:�reenville
acksonville
N.
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US Department of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
National Water Center
1325 East West Highway
Silver Spring, MD 20910
Questions?: HDSC.Questions(a)noaa.gov
Disclaimer
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Precipitation Frequency Data Server
Page 1 of 4
NOAA Atlas 14, volume 2, version 3
' Location name: Raleigh, North Carolina, USA*
Latitude: 35.8168°, Longitude: -78.7163°
recurrence interval (years)
Elevation: 431.31 ft**
source: ESRI Maps
'0
" source: USGS
25
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M. Bonnin, D. Martin, B. Lin, T. Parzybok, M.Yekta, and D. Riley
NOAH, 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���
10
25
50
100
200
500
1000
4.79
5.60
6.44
7.15
7.88
8.41
8.89 -]F
-9 -.2 -9 -]F
-9 -.7 -3 -IF
-1-0--'--I
5 -min
(4.40-5.22)
(5.15-6.12)
(5.93-7.03)
(6.56-7.79)
(7.20-8.58)
(7.64-9.16)
(8.03-9.66)
(8.35-10.1)
(8.68-10.6)
(8.90-11.0)
10
-min
(3.51$4.17)
(4.1244.89)
(4. 515.63)
(5.46.23)
(5.46.84)
(6. 9770.28)
(6. 807.68)
(6.6238.02)
(6.68.38)
(7.0198.65)
3.19
3.76
4.36
4.82
5.31
5.66
5.95
6.19
6.46
6.64
15 -min
(2.93-3.48)
1 (3.45-4.10)
(4.00-4.75)
(4.42-5.25)
(4.85-5.78)
1 (5.14-6.15)
1 (5.38-6.47)
(5.57-6.74)
1 (5.76-7.03)
(5.87-7.24)
2.19
2.59
3.09
3.49
3.93
4.26
4.56
4.82
5.14
5.38
30 -min
(2.01-2.38)
1 (2.38-2.83)
1 (2.84-3.37)
1 (3.20-3.80)
1 (3.59-4.28)
1 (3.87-4.63)
1 (4.12-4.95)
1 (4.33-5.25)
1 (4.58-5.59)
1 (4.75-5.86)
1.36
1.63
1.98
2.28
2.62
2.89
3.14
3.38
3.69
3.92
60 -min
(1.25-1.49)
1 (1.49-1.78)
1 (1.82-2.16)
1 (2.09-2.48)
1 (2.39-2.85)
1 (2.62-3.14)
1 (2.84-3.41)
1 (3.04-3.68)
(3.29-4.01)
(3.47-4.28)
0.792
0.948
1.17
1.35
1.57
1.75
1.93
2.10
2.32
2.50
2 -hr
1(0.722-0.870)1(0.867-1.04)
1 (1.07-1.28)
1 (1.23-1.48)
1 (1.42-1.72)
1 (1.58-1.92)
1 (1.72-2.11)
1 (1.86-2.29)
(2.04-2.54)
(2.18-2.73)
01(0.511-50.613)1(0.613-0.9
1.7
1.2
3 -hr
0.51150613
0.611 -0.735)1(0.7506-0.908)1(0.877-1.06)964
35)
(0.756 0908
0.8796406)
(1.0311424)
(1.15318.40
1.2741255)
(1.39516.71)(1.54-1.92)6
1.54716.92)
0.338
0.405
0.501
0.583
0.690
0.780
0.869
0.962
1.09
1.19
6 -hr
1(0.311-0.370)1(0.372-0.443)1(0.459-0.547)1(0.533-0.636
1(0.627-0.751)1(0.704-0.847)1(0.778-0.943)1(0.852-1.04)
(0.951-1.18)
1 (1.03-1.29)
0.199
0.238
0.295
0.346
0.413
0.469
0.526
0.587
0.669
0.740
12 -hr
1(0.183-0.217)1(0.219-0.260)1(0.271-0.322)1(0.316-0.377
(0.374-0.448)
(0.422-0.507)
(0.469-0.569)
(0.517-0.633)
(0.581-0.722)
(0.632-0.799)
0.119
0.144
0.180
0.209
0.247 IF
0.278
0.310
0.342
0.386
0.420
24 -hr
1(0.111-0.128)1(0.134-0.155)1(0.168-0.194)1(0.194-0.224
(0.230-0.266)
(0.258-0.299)
(0.286-0.333)
(0.315-0.368)
(0.354-0.416)
(0.384-0.454)
4
00 83
30
33 1
2 -day
.140
1(0.064-0.074)1(0.077-0.089)1(0.096-0.111)1(0.110-0.127
9 0..150
0.12
1(0.129-0.150)1(0.145-0.168)1(0.160-0.1873)1(0.1750-,
0.1457 0..168
0.160-0.3187
0.17057 0.2051)1(0.196-0.231)1(0.21O2-0.251)
5
-72
-83
3 -day
(0.04 0 052)
(0.054 0 063)
(0.0670-0 077)
(0.07070-0 089
(0.09150.8105)
(0.1017 0.117)
(0.11021 01130)
(0.1237 0.3143)
(0.137-0..161)
(0.149 0.3175)
0.038
0.046
0.057
0.065
0.077
0.086
0.095
0.104
0.117
0.128
4 -day
(0.036-0.041)
(0.043-0.049)
(0.053-0.061)
(0.061-0.070
(0.071-0.082)
(0.080-0.092)
(0.088-0.102)
(0.096-0.112)
(0.108-0.126)
(0.117-0.137)
0.025
0.030
0.037
0.042
0.049
0.055
0.061
0.067
0.075
0.081
7 -day
(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)
(0.062-0.071)
(0.069-0.080)
(0.074-0.087)
09
24
33
IF
0.046
0.060
10 -day
23
.029
01(0.035
3 .038
.042
3
.056
0.01 0 022
0.0.020
0 3 0 026
0.027-0 031
0.010 035
-
-0.040)1(0.039-0.045)1(0.043-0.049)1(0.047-0.054)1(0.050
0.00 040
0.0 9-0 045
0.04 -0 049
0.0470-0 054
0.052-0.060)1(0.055-0.064)
0.014
0.016
0.019
0.021
0.024
0.027
0.029
0.032
0.035
0.038
20 -day
1(0.013-0.014)1(0.015-0.017)1(0.018-0.020)1(0.020-0.023
(0.023-0.026)
(0.025-0.029)
(0.027-0.031)
(0.029-0.034)
(0.032-0.038)
(0.035-0.040)
0.011
0.013
0.015
0.017
0.019
0.021
0.023
0.024
0.026
0.028
30 -day
1(0.011-0.012)1(0.012-0.014)1(0.014-0.016)1(0.016-0.018
(0.018-0.020)
(0.020-0.022)
(0.021-0.024)
(0.023-0.026)
(0.025-0.028)
(0.026-0.030)
0.010
0.011
0.013
0.014
0.016
0.017
0.018
0.019
0.021
0.022
45 -day
(0.009-0.010)
(0.011-0.012)
(0.012-0.014)
(0.013-0.015
(0.015-0.017)
(0.016-0.018)
(0.017-0.019)
(0.018-0.020)
(0.020-0.022)
(0.021-0.023)
0.009
0.010
0.011
0.012
0.014
0.015
0.016
0.016
0.018
0.019
60 -day
(0.008-0009)
(0.010-0.011)
(0.011-0.012)
(0.012-0.013
(0.013-0.014)
(0.014-0.015)
(0.015-0.016)
(0.016-0.017)
(0.017-0.019)
(0.017-0.020)
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.
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Precipitation Frequency Data Server
100.000
10.000
L
C 1.000
a
G
° 0.100
0
a
V
a
CL 0.010
PF graphical
PDS -based intensity -duration -frequency (IDF) curves
Latitude: 35.81681. Longitude: -78.7163°
0.001'
— 5 -min
— 2 -day
— 10-rnn
— 3 -day
15-m,n
— 4 -day
— 30 -min
— 7 -day
— 60 -min
,
„ j
c_
— "r
— 30 -Cay
— 6-rsr
— 45 -nay
— 12 -hr
50 -day
— 24 -hr
a,
E
�c_+tel,!
E
E
E
v'1
C
�
N h
N
N V rh
4
4 �oo
,�p
14
rrn
rl
N f�'I
4
Duration
WILWAVOILVA
C
Z 0.100
V
a 0.010
0.001, r , , , , , 1 r
1 2 5 10 25 50 100 200 500 1000
Average recurrence interval (years)
NOAA Atlas 14, Volume 2, Version 3 Created (GMT): Tue Mar 20 18:43:05 2018
Back to Top
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Average recurrence
interval
(years)
— 1
2
— s
— 10
25
50
100
200
500
1000
Duration
— 5 -min
— 2 -day
— 10-rnn
— 3 -day
15-m,n
— 4 -day
— 30 -min
— 7 -day
— 60 -min
— 10 -day
— 2 -hr
— 20 -day
— "r
— 30 -Cay
— 6-rsr
— 45 -nay
— 12 -hr
50 -day
— 24 -hr
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.8168&lon=-78.7163 &dat... 3/20/2018

Precipitation Frequency Data Server
Maps & aerials
Small scale terrain
Cary
Large scale terrain
Nor
=n -Salem 0
• . Uurham Rocky Mount
Greensboro �kWei h •
a` 9
LTH CAROLINA I `Greenville��
`Charlotte +
Fayetteville,, _
100km Ja[ksonvi e
1 � •
60mi
Large scale map
hunt
:�reenville
acksonville
N.
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US Department of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
National Water Center
1325 East West Highway
Silver Spring, MD 20910
Questions?: HDSC.Questions(a)noaa.gov
Disclaimer
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.8168&lon=-78.7163 &dat... 3/20/2018

Appendix 3
Stormwater Calculations
a. Bioretention Sizing Calculations
b. Peak Flow Analysis -Storm and
Sanitary Analysis
c. Riprap Dissipater Pad Sizing
d. Nitrogen Calculations

STEWART
Project: NCDA&CS
Project No: C16123
North Drainage Area to Bioretention
Input values in red
Drainage Area
Total Drainage Area (sf) 389,155
On-site Drainage Area (sf) 389,155
Off-site Drainage Area (sf) 0
Impervious Surface
On-site Buildings/Lots (sf)
Area
73,728
On-site Streets (sf)
51,422
On-site Parking (sf)
86,904
On-site Sidewalks (sf)
27,510
Other On-site (sf)
4,976
Future (sf)
0
Off-site (sf)
0
Existing BUA* (sf)
0
Total Impervious Areas
244,540
Drainage Area
8.93 ac
Impervious Area
5.61 ac
Percent Impervious
62.84 %
Design Rainfall 1
1.0 in
Date:
"Simple Method" Formula Rv = 0.05+0.009(1)
Rv=
where
9.20.2018 Revision: -
NBC
Pervious Surface Area
Managed Pervious Area (sf) 144,615
Unmanged Pervious Area (pasture) (sf) 0
Forest (sf) 0
Total Pervious Area (sf) 144,615
* = Report only amount of existing BUA that will reamain after
develoipment. Do not report any existing BUA that is to be removed and
which will be replaced by new BUA
Rv = Runoff Coefficient = stormwater runoff (inches) /
stormwater rainfall (inches)
I = Percent Impervious = drainage area (acres) /
impervious portion of the drainage area (acres)
0.62 in/in
Controlled Volume Calculation Volume = (Design Rainfall) (Rv) (Drainage Area)
<----- Total Volume Required to be Controlled (Storage)
This volume of runoff must be stored in the pond above the normal pool elevation and be
released in a draw down period of 2 to 5 days.
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com Design Volume - Simple

STEWART
Project: NCDA&CS
Project No: C16123
North Drainage Area to Bioretention
Input values in red
Drainage Area
Total Drainage Area (sf) 389,155
On-site Drainage Area (sf) 389,155
Off-site Drainage Area (sf) 0
Impervious Surface
On-site Buildings/Lots (sf)
Area
73,728
On-site Streets (sf)
51,422
On-site Parking (sf)
86,904
On-site Sidewalks (sf)
27,510
Other On-site sf
4,976
Future (sf)
0
Off-site (sf)
0
Existing BUA* (sf)
0
Total Impervious Area (sf)
1 244,540
Drainage Area
8.93 ac
Impervious Area
5.61 ac
Percent Impervious
62.84 %
Design Rainfall 1
1.0 in
"NRCS" Formula
S=
Q*=
where
Date:
9.20.2018 Revision: -
NBC
Pervious Surface Area
Managed Pervious Area (sf) 144,615
Unmanged Pervious Area (pasture) (sf) 0
Forest (sf) 0
Total Pervious Area (sf) 144,615
Curve Number by Landuse
Impervious area 98
Managed Pervious Area, good condition ** 61
Unmanged Pervious Area (pasture) 61
Forest 58
* = Report only amount of existing BUA that will reamain after
develoipment. Do not report any existing BUA that is to be removed and
which will be replaced by new BUA
** = if CN of non -directly -connected drainage area is less than 64, MDC
allows assumption for zero runoff from this area. Therefore SCM water
quality volume only accounts for contributing runoff from impervious area.
S=(1000/CN)-10
IQ* _ [(P - 0.25) ^2] / (P + 0.85)
P = Design rainfall (inches)
Q* = Runoff Depth (inches)
0.204
0.79 in/in
Controlled Volume Calculation Volume = (Design Rainfall) (Q*) (Drainage Area)
<----- Total Volume Required to be Controlled (Storage)
This volume of runoff must be stored in the bioretention area and be released in a draw down
period of 12 to 72 hours.
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com Design Volume - NRCS

A
STEWART
Project: NCDA&CS
Project No: C16123
Input values in red
Required Surface Area
Date: 9.20.2018
Bv: NBC
Revision: -
<----- Total Volume Required to be Controlled (Storage)
IPoncling Depth 1 1.00 ft
Surface Area Calculation Surface Area = Volume /(Ponding Depth
Bio Retenion Area Volume Provided
Stage
Cumulat
ive
Elevati Area olum
Storage
Stage Level on (ft) (ft2) (ft3)
(ft3)
Drawdown Time
Facility Volume 20550 cf
Facility Surface Area 22788 sf
Media Infiltration Rate 1.00 in/hr
DK
Drain Time T = Volume / Infiltration Rate / Surface Area
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com Provided Volume

STEWART
Project: NCDA&CS Date: 9.20.2018
Project No: C16123 By: NBC
• Retention
Input values in red
Water Draw Through Rate:
Darcy's Equation: Q = .0000232 *K*A* HIL
where K = media infiltration rate
A = Area
H = Total Head
L = Flow path length
Provided Bio Retetion Area Values
K =
1.00 in/hr
A =
22788 SF
H =
4.67 ft
L=
3.92 ft
Q = 0.6294 cfs
Safety Factor 10
Adjusted Q = 6.2939 cfs
Minimum underdrain diameter Sizing
3/8
Use Manning's Equation: Q * n
D=16 S o.s ) -
Q = 6.2939 cfs
Slope = 0.005 ft/ft
n 0.011 unitless
D= 15.87 in
16 lines of
• 7 lines of
CALCULATION TABLE
Equivalent Pipe Diameters at 0.5% slope
If D is less than No. of 4" diam
4
2
5.657
3
6.928
4
8.000
5
8.944
6
9.798
7
10.583
8
11.314
9
12.000
10
12.649
11
13.253
12
If D is less than No of 6" diam
6
2
8.485
3
10.392
4
12.000
5
13.416
6
14.697
7
15.875
8
16.971
9
18.000
10
18.974
11
19.900
12
Revision: -
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com Underdrains

STEWART
Project: NCDA&CS
Project No: C16123
South Drainage Area to Stepped Bioretention
Input values in red
Drainage Area
Total Drainage Area (sf) 108,517
On-site Drainage Area (sf) 108,517
Off-site Drainage Area (sf) 0
Impervious Surface
On-site Buildings/Lots (sf)
Area
11,087
On-site Streets (sf)
603
On-site Parking (sf)
39,242
On-site Sidewalks (sf)
14,656
Other On-site (sf)
0
Future (sf)
0
Off-site (sf)
0
Existing BUA* (sf)
0
Total Impervious Areas
65,588
Drainage Area
2.49 ac
Impervious Area
1.51 ac
Percent Impervious
60.44 %
Design Rainfall 1
1.0 in
Date:
"Simple Method" Formula Rv = 0.05+0.009(1)
Rv=
where
9.19.2018 Revision: -
NBC
Pervious Surface Area
Managed Pervious Area (sf) 42,929
Unmanged Pervious Area (pasture) (sf) 0
Forest (sf) 0
Total Pervious Area (sf) 42,929
* = Report only amount of existing BUA that will reamain after
develoipment. Do not report any existing BUA that is to be removed and
which will be replaced by new BUA
Rv = Runoff Coefficient = stormwater runoff (inches) /
stormwater rainfall (inches)
I = Percent Impervious = drainage area (acres) /
impervious portion of the drainage area (acres)
0.59 in/in
Controlled Volume Calculation Volume = (Design Rainfall) (Rv) (Drainage Area)
<----- Total Volume Required to be Controlled (Storage)
This volume of runoff must be stored in the pond above the normal pool elevation and be
released in a draw down period of 2 to 5 days.
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com Design Volume - Simple

STEWART
Project: NCDA&CS
Project No: C16123
South Drainage Area to Stepped Bioretention
Input values in red
Drainage Area
Total Drainage Area (sf) 108,517
On-site Drainage Area (sf) 108,517
Off-site Drainage Area (sf) 0
Impervious Surface
On-site Buildings/Lots (sf)
Area
11,087
On-site Streets (sf)
603
On-site Parking (sf)
39,242
On-site Sidewalks (sf)
14,656
Other On-site sf
0
Future (sf)
0
Off-site (sf)
0
Existing BUA* (sf)
0
Total Impervious Area (sf)
1 65,588
Drainage Area
2.49 ac
Impervious Area
1.51 ac
Percent Impervious
60.44 %
Design Rainfall 1
1.0 in
"NRCS" Formula
S=
Q*=
where
Date:
9.19.2018 Revision: -
NBC
Pervious Surface Area
Managed Pervious Area (sf) 42,929
Unmanged Pervious Area (pasture) (sf) 0
Forest (sf) 0
Total Pervious Area (sf) 42,929
Curve Number by Landuse
Impervious area 98
Managed Pervious Area, good condition ** 61
Unmanged Pervious Area (pasture) 61
Forest 58
* = Report only amount of existing BUA that will reamain after
develoipment. Do not report any existing BUA that is to be removed and
which will be replaced by new BUA
** = if CN of non -directly -connected drainage area is less than 64, MDC
allows assumption for zero runoff from this area. Therefore SCM water
duality volume nnly arrnunts for contrihutino runnff from imnervious area.
S = (1000/CN) - 10
IQ* _ [(P - 0.25) ^2] / (P + 0.85)
P = Design rainfall (inches)
Q* = Runoff Depth (inches)
0.204
0.79 in/in
Controlled Volume Calculation
Volume = 0.10 ac -ft
1 MM
Volume = (Design Rainfall (Q*) ((Drainage Area
I<----- Total Volume Required to be Controlled (Storage)
This volume of runoff must be stored in the bioretention area and be released in a draw down
period of 12 to 72 hours.
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com Design Volume - NRCS

A
STEWART
Project: NCDA&CS
Project No: C16123
Input values in red
Required Surface Area
Date: 9.19.2018
Bv: NBC
Revision: -
<----- Total Volume Required to be Controlled (Storage)
IPoncling Depth 1 1.00 ft
Surface Area Calculation Surface Area = Volume /(Ponding Depth
Bio Retenion Area Volume Provided
JrM[-- .
Stage
Cumulat
ive
Elevati Area olum
Storage
Stage Level on (ft) (ft2) (ft3)
(ft3)
Drawdown Time
Facility Volume 7258 cf
Facility Surface Area 9071 sf
Media Infiltration Rate 1.00 in/hr
DK
Drain Time T = Volume / Infiltration Rate / Surface Area
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com Provided Volume

.1
STEWART
Project: NCDA&CS Date: 9.19.2018
Project No: C16123 By: NBC
• Retention Area• - •
Input values in red
Water Draw Through Rate:
Darcy's Equation: Q _ ,0000232 *K*A* HIL
where K = media infiltration rate
A = Area
H = Total Head
L = Flow path length
Provided Bio Retetion Area Values
K =
1.00 in/hr
A =
9071 SF
H =
4.67 ft
L=
3.92 ft
Q =
0.251 cfs
Safety Factor
10
Adjusted Q =
2.5053 cfs
Minimum underdrain diameter Sizing
3/8
Use Manning's Equation: Q * n
D=16 So.s
Q = 2.5053 cfs
Slope = 0.005 ft/ft
n 0.011 unitless
D= 11.24 in
8 lines of
• 4 lines of
CALCULATION TABLE
Equivalent Pipe Diameters at 0.5% slope
If D is less than No. of 4" diam
4
2
5.651
3
6.921
4
7.992
5
8.935
6
9.788
7
10.572
8
11.302
9
11.988
10
12.636
11
13.253
12
If D is less than No of 6" diam
6
2
8.485
3
10.392
4
12.000
5
13.416
6
14.697
7
15.875
8
16.971
9
18.000
10
18.974
11
19.900
12
Revision: -
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com Underdrains

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER
STEWART
PEAK FLOW SUMMARY (CFS)
Return
Period
Analysis
Point
PRE
POST (no detention)
POST with
detention
CHANGE
0.0000
NORTH
12.51
35.46
32.58
160.40%
2 YR
EAST
5.50
3.00
0.0000
-45.37%
SOUTH
8.06
15.27
8.10
0.42%
NORTH
34.17
64.88
62.69
83.48%
10 YR
EAST
10.70
6.50
-39.25%
SOUTH
17.03
22.52
15.34
-9.93%
30
2S
V
20
0
15
TIME
0.0833
0.1667
0.2500
0.3333
0.4167
0.5000
0.5833
0.6667
0.7500
PRE/POST PEAK RUNOFF ANALYSIS I NORTH OUTFALL - 2YR 24HR DESIGN STORM
11.0 11.5 12,0 12.5 13,0
TIME HRS
----2YR PRE -2YR POST WITHOUT DETENTION -2YR POST WITH DETENTION
2YR PRE 2YR POST WITHOUT DETENTION
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
2YR POST WITH DETENTION
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
Page I I

PEAK
FLOW ANALYSIS
-
NC AGRICULTURAL
SCIENCES CENTER
0.8333
0.0000
0.0000
0.0000
0.9167
0.0000
0.0000
0.0000
1.0000
0.0000
0.0000
0.0000
1.0833
0.0000
0.0000
0.0000
1.1667
0.0000
0.0000
0.0000
1.2500
0.0000
0.0000
0.0000
1.3333
0.0000
0.0000
0.0000
1.4167
0.0000
0.0000
0.0000
1.5000
0.0000
0.0000
0.0000
1.5833
0.0000
0.0000
0.0000
1.6667
0.0000
0.0000
0.0000
1.7500
0.0000
0.0000
0.0000
1.8333
0.0000
0.0000
0.0000
1.9167
0.0000
0.0000
0.0000
2.0000
0.0000
0.0000
0.0000
2.0833
0.0000
0.0000
0.0000
2.1667
0.0000
0.0000
0.0000
2.2500
0.0000
0.0000
0.0000
2.3333
0.0000
0.0002
0.0000
2.4167
0.0000
0.0125
0.0000
2.5000
0.0000
0.0263
0.0000
2.5833
0.0000
0.0332
0.0000
2.6667
0.0000
0.0377
0.0000
2.7500
0.0000
0.0426
0.0000
2.8333
0.0000
0.0462
0.0000
2.9167
0.0000
0.0493
0.0000
3.0000
0.0000
0.0521
0.0000
3.0833
0.0000
0.0547
0.0000
3.1667
0.0000
0.0568
0.0000
3.2500
0.0000
0.0596
0.0000
3.3333
0.0000
0.0620
0.0000
3.4167
0.0000
0.0647
0.0000
3.5000
0.0000
0.0673
0.0000
3.5833
0.0000
0.0700
0.0000
3.6667
0.0000
0.0730
0.0000
3.7500
0.0000
0.0763
0.0000
3.8333
0.0000
0.0790
0.0000
3.9167
0.0000
0.0810
0.0000
4.0000
0.0000
0.0835
0.0000
4.0833
0.0000
0.0861
0.0000
4.1667
0.0000
0.0878
0.0000
4.2500
0.0000
0.0910
0.0000
STEWART
Page 12

PEAK
FLOW ANALYSIS
-
NC AGRICULTURAL
SCIENCES CENTER
4.3333
0.0000
0.0944
0.0000
4.4167
0.0000
0.0973
0.0000
4.5000
0.0000
0.1003
0.0000
4.5833
0.0000
0.1034
0.0000
4.6667
0.0000
0.1076
0.0000
4.7500
0.0000
0.1126
0.0000
4.8333
0.0000
0.1170
0.0000
4.9167
0.0000
0.1202
0.0000
5.0000
0.0000
0.1228
0.0000
5.0833
0.0000
0.1277
0.0000
5.1667
0.0000
0.1311
0.0000
5.2500
0.0000
0.1341
0.0000
5.3333
0.0000
0.1373
0.0000
5.4167
0.0000
0.1410
0.0000
5.5000
0.0000
0.1448
0.0000
5.5833
0.0000
0.1484
0.0000
5.6667
0.0000
0.1510
0.0000
5.7500
0.0000
0.1547
0.0000
5.8333
0.0000
0.1586
0.0000
5.9167
0.0000
0.1616
0.0000
6.0000
0.0000
0.1644
0.0000
6.0833
0.0000
0.1693
0.0000
6.1667
0.0000
0.1721
0.0000
6.2500
0.0000
0.1769
0.0000
6.3333
0.0000
0.1810
0.0000
6.4167
0.0000
0.1841
0.0000
6.5000
0.0000
0.1879
0.0000
6.5833
0.0000
0.1910
0.0000
6.6667
0.0000
0.1943
0.0000
6.7500
0.0000
0.1975
0.0000
6.8333
0.0000
0.2015
0.0000
6.9167
0.0000
0.2047
0.0000
7.0000
0.0000
0.2093
0.0000
7.0833
0.0000
0.2153
0.0000
7.1667
0.0000
0.2242
0.0000
7.2500
0.0000
0.2317
0.0000
7.3333
0.0000
0.2377
0.0000
7.4167
0.0000
0.2419
0.0000
7.5000
0.0000
0.2478
0.0000
7.5833
0.0000
0.2527
0.0000
7.6667
0.0000
0.2581
0.0000
7.7500
0.0000
0.2650
0.0000
STEWART
Page 13

PEAK
FLOW ANALYSIS
-
NC AGRICULTURAL
SCIENCES CENTER
7.8333
0.0000
0.2700
0.0000
7.9167
0.0000
0.2748
0.0000
8.0000
0.0000
0.2803
0.0000
8.0833
0.0000
0.2841
0.0000
8.1667
0.0000
0.2894
0.0000
8.2500
0.0000
0.2975
0.0000
8.3333
0.0000
0.3102
0.0000
8.4167
0.0000
0.3247
0.0000
8.5000
0.0000
0.3385
0.0000
8.5833
0.0000
0.3527
0.0000
8.6667
0.0000
0.3686
0.0000
8.7500
0.0000
0.3854
0.0000
8.8333
0.0000
0.4019
0.0000
8.9167
0.0000
0.4170
0.0000
9.0000
0.0000
0.4319
0.0000
9.0833
0.0000
0.4502
0.0000
9.1667
0.0000
0.4667
0.0000
9.2500
0.0000
0.4787
0.0000
9.3333
0.0000
0.4877
0.0000
9.4167
0.0000
0.4916
0.0000
9.5000
0.0000
0.4952
0.0000
9.5833
0.0000
0.5012
0.0000
9.6667
0.0000
0.5089
0.0000
9.7500
0.0000
0.5228
0.0000
9.8333
0.0000
0.5451
0.0000
9.9167
0.0000
0.5708
0.0000
10.0000
0.0001
0.5981
0.0002
10.0833
0.0005
0.6268
0.0002
10.1667
0.0020
0.6581
0.0005
10.2500
0.0045
0.6993
0.0017
10.3333
0.0081
0.7441
0.0047
10.4167
0.0123
0.7874
0.0093
10.5000
0.0171
0.8311
0.0146
10.5833
0.0225
0.8828
0.0201
10.6667
0.0283
0.9396
0.0260
10.7500
0.0349
1.0053
0.0323
10.8333
0.0424
1.0801
0.0395
10.9167
0.0505
1.1532
0.0474
11.0000
0.0595
1.2312
0.0564
11.0833
0.0697
1.3192
0.0664
11.1667
0.0819
1.4291
0.0777
11.2500
0.0978
1.5780
0.0924
STEWART
Page 14

PEAK
FLOW ANALYSIS
-
NC AGRICULTURAL
SCIENCES CENTER
11.3333
0.1170
1.7556
0.1112
11.4167
0.1391
1.9425
0.1329
11.5000
0.1648
2.1448
0.1574
11.5833
0.1940
2.3717
0.1863
11.6667
0.3251
3.5153
0.2773
11.7500
0.7162
6.9624
0.9532
11.8333
1.5032
12.2778
3.5518
11.9167
3.5153
20.1691
8.7908
12.0000
9.1269
34.4253
22.1125
12.0833
12.5112
35.4613
32.5791
12.1667
9.7916
20.1431
26.6719
12.2500
5.6066
9.5837
15.9269
12.3333
3.6485
6.4804
10.1427
12.4167
2.8866
5.6023
7.5850
12.5000
2.4637
4.9305
6.3763
12.5833
2.1196
4.2231
5.4592
12.6667
1.8345
3.6026
4.6715
12.7500
1.6439
3.2223
4.0433
12.8333
1.5326
3.0174
3.5663
12.9167
1.4543
2.8612
3.1991
13.0000
1.3819
2.7102
2.9029
13.0833
1.3087
2.5450
2.6498
13.1667
1.2396
2.3878
2.4295
13.2500
1.1830
2.2669
2.2435
13.3333
1.1381
2.1752
2.0902
13.4167
1.0982
2.0969
1.9534
13.5000
1.0585
2.0138
1.8351
13.5833
1.0168
1.9241
1.7260
13.6667
0.9766
1.8354
1.6238
13.7500
0.9413
1.7607
1.5311
13.8333
0.9101
1.6968
1.4476
13.9167
0.8799
1.6401
1.3720
14.0000
0.8493
1.5824
1.3010
14.0833
0.8175
1.5181
1.2321
14.1667
0.7900
1.4604
1.1677
14.2500
0.7689
1.4177
1.1112
14.3333
0.7546
1.3920
1.0627
14.4167
0.7443
1.3709
1.0212
14.5000
0.7340
1.3510
0.9844
14.5833
0.7242
1.3288
0.9511
14.6667
0.7140
1.3040
0.9197
14.7500
0.7037
1.2810
0.8904
STEWART
Page 15

PEAK
FLOW ANALYSIS
-
NC AGRICULTURAL
SCIENCES CENTER
14.8333
0.6938
1.2603
0.8637
14.9167
0.6840
1.2398
0.8385
15.0000
0.6741
1.2205
0.8146
15.0833
0.6630
1.2000
0.7916
15.1667
0.6520
1.1746
0.7676
15.2500
0.6415
1.1516
0.7446
15.3333
0.6304
1.1295
0.7223
15.4167
0.6203
1.1133
0.7013
15.5000
0.6095
1.0931
0.6803
15.5833
0.5977
1.0699
0.6592
15.6667
0.5858
1.0464
0.6380
15.7500
0.5746
1.0224
0.6162
15.8333
0.5635
1.0026
0.5955
15.9167
0.5520
0.9817
0.5752
16.0000
0.5407
0.9628
0.5551
16.0833
0.5286
0.9417
0.5349
16.1667
0.5177
0.9165
0.5145
16.2500
0.5097
0.9008
0.4956
16.3333
0.5046
0.8919
0.4798
16.4167
0.5006
0.8836
0.4656
16.5000
0.4961
0.8762
0.4517
16.5833
0.4923
0.8689
0.4394
16.6667
0.4886
0.8627
0.4280
16.7500
0.4853
0.8549
0.4177
16.8333
0.4813
0.8449
0.4071
16.9167
0.4771
0.8379
0.3975
17.0000
0.4735
0.8294
0.3889
17.0833
0.4697
0.8217
0.3797
17.1667
0.4655
0.8141
0.3710
17.2500
0.4616
0.8036
0.3617
17.3333
0.4577
0.7966
0.3535
17.4167
0.4537
0.7900
0.3452
17.5000
0.4503
0.7817
0.3375
17.5833
0.4461
0.7740
0.3293
17.6667
0.4417
0.7670
0.3214
17.7500
0.4377
0.7592
0.3138
17.8333
0.4338
0.7528
0.3068
17.9167
0.4295
0.7453
0.2992
18.0000
0.4251
0.7356
0.2917
18.0833
0.4212
0.7283
0.2844
18.1667
0.4168
0.7195
0.2773
18.2500
0.4127
0.7119
0.2694
STEWART
Page 16

PEAK
FLOW ANALYSIS
-
NC AGRICULTURAL
SCIENCES CENTER
18.3333
0.4087
0.7038
0.2626
18.4167
0.4048
0.6954
0.2555
18.5000
0.4002
0.6875
0.2486
18.5833
0.3958
0.6774
0.2409
18.6667
0.3918
0.6720
0.2340
18.7500
0.3873
0.6645
0.2269
18.8333
0.3828
0.6550
0.2201
18.9167
0.3785
0.6491
0.2134
19.0000
0.3743
0.6422
0.2075
19.0833
0.3697
0.6335
0.2010
19.1667
0.3650
0.6251
0.1947
19.2500
0.3605
0.6173
0.1883
19.3333
0.3560
0.6077
0.1822
19.4167
0.3519
0.6013
0.1764
19.5000
0.3479
0.5954
0.1714
19.5833
0.3429
0.5877
0.1662
19.6667
0.3380
0.5770
0.1607
19.7500
0.3339
0.5670
0.1568
19.8333
0.3295
0.5598
0.1535
19.9167
0.3247
0.5505
0.1508
20.0000
0.3204
0.5431
0.1486
20.0833
0.3156
0.5367
0.1468
20.1667
0.3115
0.5277
0.1443
20.2500
0.3085
0.5233
0.1426
20.3333
0.3066
0.5196
0.1421
20.4167
0.3061
0.5189
0.1419
20.5000
0.3049
0.5180
0.1416
20.5833
0.3041
0.5147
0.1408
20.6667
0.3036
0.5139
0.1405
20.7500
0.3031
0.5138
0.1404
20.8333
0.3022
0.5122
0.1401
20.9167
0.3013
0.5090
0.1394
21.0000
0.3004
0.5056
0.1392
21.0833
0.3000
0.5043
0.1386
21.1667
0.2989
0.5038
0.1380
21.2500
0.2981
0.5027
0.1373
21.3333
0.2974
0.5020
0.1371
21.4167
0.2970
0.5013
0.1371
21.5000
0.2959
0.4995
0.1369
21.5833
0.2951
0.4972
0.1362
21.6667
0.2944
0.4958
0.1361
21.7500
0.2940
0.4942
0.1360
STEWART
Page 17

PEAK
FLOW ANALYSIS
-
NC AGRICULTURAL
SCIENCES CENTER
21.8333
0.2940
0.4939
0.1360
21.9167
0.2929
0.4931
0.1357
22.0000
0.2915
0.4908
0.1350
22.0833
0.2911
0.4891
0.1340
22.1667
0.2904
0.4852
0.1335
22.2500
0.2896
0.4836
0.1332
22.3333
0.2885
0.4813
0.1325
22.4167
0.2881
0.4802
0.1323
22.5000
0.2869
0.4797
0.1320
22.5833
0.2861
0.4781
0.1314
22.6667
0.2854
0.4775
0.1312
22.7500
0.2845
0.4766
0.1311
22.8333
0.2841
0.4753
0.1311
22.9167
0.2829
0.4741
0.1303
23.0000
0.2821
0.4727
0.1293
23.0833
0.2814
0.4721
0.1291
23.1667
0.2810
0.4710
0.1290
23.2500
0.2799
0.4692
0.1289
23.3333
0.2791
0.4659
0.1282
23.4167
0.2784
0.4641
0.1280
23.5000
0.2770
0.4626
0.1278
23.5833
0.2761
0.4604
0.1272
23.6667
0.2755
0.4595
0.1270
23.7500
0.2751
0.4587
0.1269
23.8333
0.2750
0.4570
0.1262
23.9167
0.2737
0.4553
0.1255
24.0000
0.2724
0.4525
0.1247
STEWART
Page 18

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER
80
70
60
50
u
V
40
O
30
20
10
STEWART
PRE/POST PEAK RUNOFF ANALYSIS I NORTH OUTFALL - 10YR 24HR DESIGN STORM
0 ----
10, 5 11.0 11.5 12, 0 12.5 13.0 13, 5 14.0
TIME HRS
----- 10YR PRE 10YR POST WITHOUT DETENTION - 10YR POST WITH DETENTION
TIME
0.0833
0.1667
0.2500
0.3333
0.4167
0.5000
0.5833
0.6667
0.7500
0.8333
0.9167
1.0000
1.0833
1.1667
1.2500
1.3333
1.4167
1.5000
10YR PRE
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
10YR POST WITHOUT DETENTION
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
10YR POST WITH DETENTION
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
Page 19

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
1.5833
0.0000
0.0038
0.0000
1.6667
0.0000
0.0056
0.0000
1.7500
0.0000
0.0331
0.0000
1.8333
0.0000
0.0493
0.0000
1.9167
0.0000
0.0579
0.0000
2.0000
0.0000
0.0655
0.0000
2.0833
0.0000
0.0730
0.0000
2.1667
0.0000
0.0795
0.0000
2.2500
0.0000
0.0851
0.0000
2.3333
0.0000
0.0895
0.0000
2.4167
0.0000
0.0942
0.0000
2.5000
0.0000
0.1003
0.0000
2.5833
0.0000
0.1051
0.0000
2.6667
0.0000
0.1105
0.0000
2.7500
0.0000
0.1154
0.0000
2.8333
0.0000
0.1205
0.0000
2.9167
0.0000
0.1252
0.0000
3.0000
0.0000
0.1304
0.0000
3.0833
0.0000
0.1350
0.0000
3.1667
0.0000
0.1399
0.0000
3.2500
0.0000
0.1468
0.0000
3.3333
0.0000
0.1517
0.0000
3.4167
0.0000
0.1559
0.0000
3.5000
0.0000
0.1621
0.0000
3.5833
0.0000
0.1665
0.0000
3.6667
0.0000
0.1709
0.0000
3.7500
0.0000
0.1749
0.0000
3.8333
0.0000
0.1788
0.0000
3.9167
0.0000
0.1828
0.0000
4.0000
0.0000
0.1870
0.0000
4.0833
0.0000
0.1925
0.0000
4.1667
0.0000
0.1966
0.0000
4.2500
0.0000
0.2014
0.0000
4.3333
0.0000
0.2067
0.0000
4.4167
0.0000
0.2111
0.0000
4.5000
0.0000
0.2179
0.0000
4.5833
0.0000
0.2245
0.0000
4.6667
0.0000
0.2308
0.0000
4.7500
0.0000
0.2368
0.0000
4.8333
0.0000
0.2417
0.0000
4.9167
0.0000
0.2481
0.0000
5.0000
0.0000
0.2528
0.0000
Page 110

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
5.0833
0.0000
0.2586
0.0000
5.1667
0.0000
0.2650
0.0000
5.2500
0.0000
0.2804
0.0000
5.3333
0.0000
0.2925
0.0000
5.4167
0.0000
0.2991
0.0000
5.5000
0.0000
0.3061
0.0000
5.5833
0.0000
0.3143
0.0000
5.6667
0.0000
0.3220
0.0000
5.7500
0.0000
0.3276
0.0000
5.8333
0.0000
0.3357
0.0000
5.9167
0.0000
0.3449
0.0000
6.0000
0.0000
0.3525
0.0000
6.0833
0.0000
0.3605
0.0000
6.1667
0.0000
0.3699
0.0000
6.2500
0.0000
0.3780
0.0000
6.3333
0.0000
0.3853
0.0000
6.4167
0.0000
0.3930
0.0000
6.5000
0.0000
0.4020
0.0000
6.5833
0.0000
0.4104
0.0000
6.6667
0.0000
0.4192
0.0000
6.7500
0.0000
0.4266
0.0000
6.8333
0.0000
0.4327
0.0000
6.9167
0.0000
0.4430
0.0000
7.0000
0.0000
0.4514
0.0000
7.0833
0.0000
0.4584
0.0000
7.1667
0.0000
0.4667
0.0000
7.2500
0.0000
0.4762
0.0000
7.3333
0.0000
0.4841
0.0000
7.4167
0.0000
0.4931
0.0000
7.5000
0.0000
0.4995
0.0000
7.5833
0.0000
0.5089
0.0000
7.6667
0.0000
0.5188
0.0000
7.7500
0.0000
0.5273
0.0000
7.8333
0.0001
0.5375
0.0003
7.9167
0.0004
0.5469
0.0002
8.0000
0.0012
0.5565
0.0003
8.0833
0.0026
0.5667
0.0009
8.1667
0.0046
0.5816
0.0023
8.2500
0.0070
0.6014
0.0048
8.3333
0.0099
0.6267
0.0077
8.4167
0.0128
0.6549
0.0108
8.5000
0.0159
0.6840
0.0142
Page I 1 1

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
8.5833
0.0193
0.7147
0.0177
8.6667
0.0229
0.7477
0.0212
8.7500
0.0268
0.7838
0.0250
8.8333
0.0309
0.8181
0.0291
8.9167
0.0351
0.8491
0.0333
9.0000
0.0393
0.8818
0.0376
9.0833
0.0438
0.9157
0.0421
9.1667
0.0485
0.9518
0.0469
9.2500
0.0529
0.9764
0.0515
9.3333
0.0569
0.9919
0.0557
9.4167
0.0607
1.0029
0.0597
9.5000
0.0643
1.0132
0.0632
9.5833
0.0678
1.0212
0.0664
9.6667
0.0718
1.0374
0.0702
9.7500
0.0770
1.0721
0.0748
9.8333
0.0832
1.1194
0.0809
9.9167
0.0901
1.1694
0.0874
10.0000
0.0974
1.2229
0.0951
10.0833
0.1054
1.2819
0.1031
10.1667
0.1146
1.3492
0.1120
10.2500
0.1251
1.4238
0.1220
10.3333
0.1361
1.5059
0.1327
10.4167
0.1476
1.5881
0.1446
10.5000
0.1600
1.6741
0.1569
10.5833
0.1739
1.7691
0.1703
10.6667
0.1901
1.8785
0.2128
10.7500
0.2090
2.0080
0.3869
10.8333
0.2292
2.1484
0.6067
10.9167
0.2508
2.2924
0.8417
11.0000
0.2833
2.4426
1.0784
11.0833
0.3343
2.6110
1.3193
11.1667
0.4069
2.8359
1.5659
11.2500
0.5020
3.1437
1.8382
11.3333
0.6171
3.4966
2.1411
11.4167
0.7531
3.8629
2.4753
11.5000
0.9133
4.2603
2.8391
11.5833
1.0989
4.7043
3.2414
11.6667
1.8263
7.2557
4.2175
11.7500
3.7772
14.2449
7.1241
11.8333
7.5102
24.5706
14.5656
11.9167
14.1462
39.1160
28.4584
12.0000
28.1565
63.0647
50.5489
Page 112

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
12.0833
34.1662
64.8757
62.6867
12.1667
25.4309
34.9948
46.9083
12.2500
13.7420
16.7090
26.3895
12.3333
8.6304
11.5822
16.4789
12.4167
6.6765
10.0650
12.3340
12.5000
5.6092
8.8405
10.1524
12.5833
4.7795
7.5599
8.6135
12.6667
4.1280
6.4606
7.4834
12.7500
3.6819
5.7917
6.6764
12.8333
3.4158
5.4104
6.0378
12.9167
3.2262
5.1183
5.5289
13.0000
3.0540
4.8279
5.1019
13.0833
2.8814
4.5208
4.7204
13.1667
2.7224
4.2338
4.3789
13.2500
2.5924
4.0132
4.0872
13.3333
2.4887
3.8442
3.8398
13.4167
2.3948
3.6943
3.6263
13.5000
2.3009
3.5439
3.4345
13.5833
2.2054
3.3808
3.2530
13.6667
2.1144
3.2228
3.0821
13.7500
2.0335
3.0888
2.9261
13.8333
1.9626
2.9769
2.7870
13.9167
1.8952
2.8740
2.6599
14.0000
1.8268
2.7683
2.5399
14.0833
1.7561
2.6524
2.4208
14.1667
1.6930
2.5474
2.3147
14.2500
1.6464
2.4753
2.2134
14.3333
1.6139
2.4257
2.1323
14.4167
1.5903
2.3904
2.0647
14.5000
1.5666
2.3519
2.0049
14.5833
1.5429
2.3117
1.9503
14.6667
1.5198
2.2707
1.9002
14.7500
1.4958
2.2290
1.8528
14.8333
1.4734
2.1935
1.8081
14.9167
1.4494
2.1572
1.7668
15.0000
1.4268
2.1197
1.7267
15.0833
1.4027
2.0822
1.6863
15.1667
1.3777
2.0385
1.6465
15.2500
1.3537
1.9989
1.6070
15.3333
1.3292
1.9631
1.5683
15.4167
1.3060
1.9270
1.5318
15.5000
1.2810
1.8909
1.4941
Page 113

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
15.5833
1.2562
1.8508
1.4567
15.6667
1.2309
1.8104
1.4182
15.7500
1.2058
1.7702
1.3804
15.8333
1.1816
1.7336
1.3432
15.9167
1.1564
1.6981
1.3067
16.0000
1.1320
1.6638
1.2714
16.0833
1.1056
1.6227
1.2342
16.1667
1.0818
1.5844
1.1973
16.2500
1.0644
1.5586
1.1656
16.3333
1.0524
1.5417
1.1379
16.4167
1.0436
1.5292
1.1136
16.5000
1.0349
1.5146
1.0915
16.5833
1.0259
1.5008
1.0712
16.6667
1.0171
1.4852
1.0522
16.7500
1.0082
1.4723
1.0342
16.8333
1.0004
1.4599
1.0179
16.9167
0.9921
1.4464
1.0026
17.0000
0.9832
1.4339
0.9877
17.0833
0.9745
1.4205
0.9723
17.1667
0.9655
1.4042
0.9575
17.2500
0.9569
1.3893
0.9431
17.3333
0.9477
1.3741
0.9284
17.4167
0.9397
1.3614
0.9144
17.5000
0.9310
1.3492
0.9009
17.5833
0.9219
1.3354
0.8872
17.6667
0.9130
1.3210
0.8727
17.7500
0.9040
1.3081
0.8592
17.8333
0.8948
1.2928
0.8457
17.9167
0.8854
1.2774
0.8321
18.0000
0.8768
1.2663
0.8186
18.0833
0.8677
1.2544
0.8056
18.1667
0.8585
1.2394
0.7923
18.2500
0.8492
1.2253
0.7791
18.3333
0.8399
1.2120
0.7651
18.4167
0.8310
1.1982
0.7521
18.5000
0.8221
1.1859
0.7392
18.5833
0.8124
1.1716
0.7261
18.6667
0.8037
1.1578
0.7127
18.7500
0.7939
1.1432
0.6994
18.8333
0.7849
1.1292
0.6858
18.9167
0.7757
1.1157
0.6728
19.0000
0.7666
1.1050
0.6601
Page 114

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
19.0833
0.7571
1.0904
0.6476
19.1667
0.7472
1.0715
0.6337
19.2500
0.7378
1.0569
0.6191
19.3333
0.7288
1.0433
0.6056
19.4167
0.7200
1.0301
0.5924
19.5000
0.7099
1.0165
0.5791
19.5833
0.7003
1.0035
0.5659
19.6667
0.6908
0.9912
0.5523
19.7500
0.6815
0.9758
0.5387
19.8333
0.6721
0.9618
0.5256
19.9167
0.6620
0.9473
0.5129
20.0000
0.6526
0.9328
0.5001
20.0833
0.6432
0.9202
0.4864
20.1667
0.6339
0.9072
0.4739
20.2500
0.6279
0.9001
0.4624
20.3333
0.6241
0.8936
0.4531
20.4167
0.6224
0.8907
0.4454
20.5000
0.6206
0.8872
0.4375
20.5833
0.6186
0.8837
0.4305
20.6667
0.6168
0.8814
0.4246
20.7500
0.6154
0.8780
0.4189
20.8333
0.6139
0.8745
0.4138
20.9167
0.6118
0.8706
0.4080
21.0000
0.6104
0.8689
0.4037
21.0833
0.6088
0.8672
0.3998
21.1667
0.6074
0.8633
0.3958
21.2500
0.6058
0.8620
0.3923
21.3333
0.6037
0.8593
0.3880
21.4167
0.6026
0.8566
0.3847
21.5000
0.6008
0.8543
0.3815
21.5833
0.5994
0.8504
0.3786
21.6667
0.5973
0.8476
0.3746
21.7500
0.5949
0.8461
0.3714
21.8333
0.5934
0.8454
0.3688
21.9167
0.5911
0.8435
0.3665
22.0000
0.5894
0.8386
0.3639
22.0833
0.5878
0.8350
0.3607
22.1667
0.5864
0.8307
0.3577
22.2500
0.5848
0.8293
0.3551
22.3333
0.5827
0.8257
0.3523
22.4167
0.5814
0.8236
0.3499
22.5000
0.5797
0.8202
0.3467
Page 115

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
22.5833
0.5777
0.8166
0.3435
22.6667
0.5759
0.8150
0.3410
22.7500
0.5744
0.8107
0.3383
22.8333
0.5728
0.8096
0.3358
22.9167
0.5707
0.8065
0.3325
23.0000
0.5694
0.8052
0.3302
23.0833
0.5674
0.8036
0.3281
23.1667
0.5656
0.7996
0.3256
23.2500
0.5638
0.7957
0.3225
23.3333
0.5617
0.7919
0.3195
23.4167
0.5605
0.7891
0.3170
23.5000
0.5582
0.7869
0.3140
23.5833
0.5564
0.7840
0.3114
23.6667
0.5542
0.7811
0.3084
23.7500
0.5524
0.7778
0.3056
23.8333
0.5514
0.7758
0.3036
23.9167
0.5492
0.7743
0.3013
24.0000
0.5474
0.7717
0.2987
Page 116

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER
6
5
4
0
PRE/POST PEAK RUNOFF ANALYSIS I EAST OUTFALL- 2YR 24HR DESIGN STORM
STEWART
11.0 11.5 12.0 12.5 13.0 13.5 14.0
TIME HRS
-- 2YR PRE 2YR POST WITHOUT DETENTION
TIME 2YR PRE 2YR POST WITHOUT DETENTION
0.0833
0.0000
0.0000
0.1667
0.0000
0.0000
0.2500
0.0000
0.0000
0.3333
0.0000
0.0000
0.4167
0.0000
0.0000
0.5000
0.0000
0.0000
0.5833
0.0000
0.0000
0.6667
0.0000
0.0000
0.7500
0.0000
0.0000
0.8333
0.0000
0.0000
0.9167
0.0000
0.0000
1.0000
0.0000
0.0000
1.0833
0.0000
0.0000
1.1667
0.0000
0.0000
1.2500
0.0000
0.0000
1.3333
0.0000
0.0000
1.4167
0.0000
0.0000
1.5000
0.0000
0.0000
Page 117

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
1.5833
0.0000
0.0000
1.6667
0.0000
0.0000
1.7500
0.0000
0.0000
1.8333
0.0000
0.0000
1.9167
0.0000
0.0000
2.0000
0.0000
0.0000
2.0833
0.0000
0.0000
2.1667
0.0000
0.0000
2.2500
0.0000
0.0000
2.3333
0.0000
0.0000
2.4167
0.0000
0.0000
2.5000
0.0000
0.0000
2.5833
0.0000
0.0000
2.6667
0.0000
0.0000
2.7500
0.0000
0.0000
2.8333
0.0000
0.0000
2.9167
0.0000
0.0000
3.0000
0.0000
0.0000
3.0833
0.0000
0.0000
3.1667
0.0000
0.0000
3.2500
0.0000
0.0000
3.3333
0.0000
0.0000
3.4167
0.0000
0.0000
3.5000
0.0000
0.0000
3.5833
0.0000
0.0000
3.6667
0.0000
0.0000
3.7500
0.0000
0.0000
3.8333
0.0000
0.0000
3.9167
0.0000
0.0000
4.0000
0.0000
0.0000
4.0833
0.0000
0.0000
4.1667
0.0000
0.0000
4.2500
0.0000
0.0000
4.3333
0.0000
0.0000
4.4167
0.0000
0.0000
4.5000
0.0000
0.0000
4.5833
0.0000
0.0000
4.6667
0.0000
0.0000
4.7500
0.0000
0.0000
4.8333
0.0000
0.0000
4.9167
0.0000
0.0000
5.0000
0.0000
0.0000
Page 118

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
5.0833
0.0000
0.0000
5.1667
0.0000
0.0000
5.2500
0.0000
0.0000
5.3333
0.0000
0.0000
5.4167
0.0000
0.0000
5.5000
0.0000
0.0000
5.5833
0.0000
0.0000
5.6667
0.0000
0.0000
5.7500
0.0000
0.0000
5.8333
0.0000
0.0000
5.9167
0.0000
0.0000
6.0000
0.0000
0.0000
6.0833
0.0000
0.0000
6.1667
0.0000
0.0000
6.2500
0.0000
0.0000
6.3333
0.0000
0.0000
6.4167
0.0000
0.0000
6.5000
0.0000
0.0000
6.5833
0.0000
0.0000
6.6667
0.0000
0.0000
6.7500
0.0000
0.0000
6.8333
0.0000
0.0000
6.9167
0.0000
0.0000
7.0000
0.0000
0.0000
7.0833
0.0000
0.0000
7.1667
0.0000
0.0000
7.2500
0.0000
0.0000
7.3333
0.0000
0.0000
7.4167
0.0000
0.0000
7.5000
0.0000
0.0000
7.5833
0.0000
0.0000
7.6667
0.0000
0.0000
7.7500
0.0000
0.0000
7.8333
0.0000
0.0000
7.9167
0.0000
0.0000
8.0000
0.0000
0.0000
8.0833
0.0000
0.0000
8.1667
0.0000
0.0000
8.2500
0.0000
0.0000
8.3333
0.0000
0.0000
8.4167
0.0000
0.0000
8.5000
0.0000
0.0000
Page 119

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
8.5833
0.0000
0.0000
8.6667
0.0000
0.0000
8.7500
0.0000
0.0000
8.8333
0.0000
0.0000
8.9167
0.0000
0.0000
9.0000
0.0000
0.0000
9.0833
0.0000
0.0000
9.1667
0.0000
0.0000
9.2500
0.0000
0.0000
9.3333
0.0000
0.0000
9.4167
0.0000
0.0000
9.5000
0.0000
0.0000
9.5833
0.0000
0.0000
9.6667
0.0000
0.0000
9.7500
0.0000
0.0000
9.8333
0.0000
0.0000
9.9167
0.0000
0.0000
10.0000
0.0000
0.0000
10.0833
0.0000
0.0000
10.1667
0.0000
0.0000
10.2500
0.0000
0.0000
10.3333
0.0000
0.0000
10.4167
0.0000
0.0000
10.5000
0.0000
0.0000
10.5833
0.0000
0.0000
10.6667
0.0000
0.0000
10.7500
0.0000
0.0000
10.8333
0.0000
0.0014
10.9167
0.0000
0.0057
11.0000
0.0000
0.0107
11.0833
0.0000
0.0162
11.1667
0.0000
0.0225
11.2500
0.0000
0.0298
11.3333
0.0000
0.0390
11.4167
0.0000
0.0502
11.5000
0.0001
0.0632
11.5833
0.0060
0.0787
11.6667
0.0566
0.1335
11.7500
0.2364
0.2912
11.8333
0.7161
0.6181
11.9167
1.8645
1.2758
12.0000
4.5095
2.6851
Page 120

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
12.0833
5.4978
3.0034
12.1667
3.6402
1.9358
12.2500
1.7998
0.9588
12.3333
1.2029
0.6233
12.4167
1.0155
0.5187
12.5000
0.8921
0.4528
12.5833
0.7674
0.3890
12.6667
0.6686
0.3375
12.7500
0.6058
0.3042
12.8333
0.5713
0.2859
12.9167
0.5437
0.2716
13.0000
0.5152
0.2573
13.0833
0.4868
0.2424
13.1667
0.4613
0.2294
13.2500
0.4413
0.2188
13.3333
0.4258
0.2105
13.4167
0.4105
0.2031
13.5000
0.3946
0.1947
13.5833
0.3783
0.1864
13.6667
0.3635
0.1790
13.7500
0.3507
0.1727
13.8333
0.3391
0.1668
13.9167
0.3280
0.1609
14.0000
0.3161
0.1549
14.0833
0.3036
0.1490
14.1667
0.2937
0.1437
14.2500
0.2865
0.1400
14.3333
0.2820
0.1377
14.4167
0.2784
0.1357
14.5000
0.2742
0.1337
14.5833
0.2705
0.1317
14.6667
0.2665
0.1297
14.7500
0.2629
0.1277
14.8333
0.2591
0.1257
14.9167
0.2551
0.1237
15.0000
0.2511
0.1217
15.0833
0.2464
0.1197
15.1667
0.2424
0.1177
15.2500
0.2384
0.1157
15.3333
0.2342
0.1137
15.4167
0.2305
0.1117
15.5000
0.2263
0.1097
Page 121

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
15.5833
0.2221
0.1076
15.6667
0.2174
0.1050
15.7500
0.2132
0.1027
15.8333
0.2092
0.1008
15.9167
0.2045
0.0988
16.0000
0.2002
0.0968
16.0833
0.1955
0.0941
16.1667
0.1919
0.0924
16.2500
0.1891
0.0914
16.3333
0.1874
0.0904
16.4167
0.1862
0.0894
16.5000
0.1846
0.0884
16.5833
0.1833
0.0880
16.6667
0.1816
0.0874
16.7500
0.1803
0.0864
16.8333
0.1786
0.0857
16.9167
0.1773
0.0852
17.0000
0.1756
0.0844
17.0833
0.1743
0.0834
17.1667
0.1726
0.0825
17.2500
0.1713
0.0820
17.3333
0.1696
0.0814
17.4167
0.1683
0.0804
17.5000
0.1666
0.0794
17.5833
0.1653
0.0790
17.6667
0.1636
0.0784
17.7500
0.1623
0.0774
17.8333
0.1606
0.0768
17.9167
0.1593
0.0763
18.0000
0.1577
0.0754
18.0833
0.1557
0.0744
18.1667
0.1543
0.0734
18.2500
0.1527
0.0730
18.3333
0.1513
0.0724
18.4167
0.1497
0.0714
18.5000
0.1477
0.0704
18.5833
0.1463
0.0694
18.6667
0.1447
0.0690
18.7500
0.1429
0.0684
18.8333
0.1415
0.0674
18.9167
0.1397
0.0664
19.0000
0.1383
0.0654
Page 122

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
19.0833
0.1367
0.0650
19.1667
0.1347
0.0644
19.2500
0.1329
0.0634
19.3333
0.1315
0.0624
19.4167
0.1297
0.0614
19.5000
0.1280
0.0610
19.5833
0.1265
0.0604
19.6667
0.1247
0.0594
19.7500
0.1227
0.0584
19.8333
0.1214
0.0574
19.9167
0.1197
0.0565
20.0000
0.1177
0.0560
20.0833
0.1160
0.0554
20.1667
0.1145
0.0545
20.2500
0.1139
0.0540
20.3333
0.1133
0.0540
20.4167
0.1130
0.0540
20.5000
0.1124
0.0534
20.5833
0.1120
0.0530
20.6667
0.1120
0.0530
20.7500
0.1120
0.0530
20.8333
0.1120
0.0530
20.9167
0.1114
0.0530
21.0000
0.1110
0.0530
21.0833
0.1110
0.0524
21.1667
0.1104
0.0520
21.2500
0.1100
0.0520
21.3333
0.1100
0.0520
21.4167
0.1100
0.0520
21.5000
0.1094
0.0520
21.5833
0.1090
0.0514
21.6667
0.1090
0.0510
21.7500
0.1084
0.0510
21.8333
0.1080
0.0510
21.9167
0.1080
0.0510
22.0000
0.1080
0.0510
22.0833
0.1074
0.0510
22.1667
0.1070
0.0505
22.2500
0.1070
0.0500
22.3333
0.1064
0.0500
22.4167
0.1060
0.0500
22.5000
0.1060
0.0500
Page 123

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER
22.5833
0.1060
0.0500
22.6667
0.1054
0.0500
22.7500
0.1050
0.0495
22.8333
0.1050
0.0490
22.9167
0.1044
0.0490
23.0000
0.1040
0.0490
23.0833
0.1040
0.0490
23.1667
0.1034
0.0490
23.2500
0.1030
0.0485
23.3333
0.1030
0.0480
23.4167
0.1030
0.0480
23.5000
0.1024
0.0480
23.5833
0.1020
0.0480
23.6667
0.1014
0.0480
23.7500
0.1010
0.0480
23.8333
0.1010
0.0475
23.9167
0.1004
0.0470
24.0000
0.1000
0.0470
8
V
6
0
4
2
STEWART
PRE/POST PEAK RUNOFF ANALYSIS I EAST OUTFALL - 10YR 24H DESIGN STORM
0
10.5 11.0 11.5 12, 0 12, 5 13.0 13.5 14.0
----- 10YR PRE
TIME HRS
10YR POSE WITHOUT DETENTION
Page 124

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER
TIME
10YR PRE
10YR POST WITHOUT DETENTION
0.0833
0.0000
0.0000
0.1667
0.0000
0.0000
0.2500
0.0000
0.0000
0.3333
0.0000
0.0000
0.4167
0.0000
0.0000
0.5000
0.0000
0.0000
0.5833
0.0000
0.0000
0.6667
0.0000
0.0000
0.7500
0.0000
0.0000
0.8333
0.0000
0.0000
0.9167
0.0000
0.0000
1.0000
0.0000
0.0000
1.0833
0.0000
0.0000
1.1667
0.0000
0.0000
1.2500
0.0000
0.0000
1.3333
0.0000
0.0000
1.4167
0.0000
0.0000
1.5000
0.0000
0.0000
1.5833
0.0000
0.0000
1.6667
0.0000
0.0000
1.7500
0.0000
0.0000
1.8333
0.0000
0.0000
1.9167
0.0000
0.0000
2.0000
0.0000
0.0000
2.0833
0.0000
0.0000
2.1667
0.0000
0.0000
2.2500
0.0000
0.0000
2.3333
0.0000
0.0000
2.4167
0.0000
0.0000
2.5000
0.0000
0.0000
2.5833
0.0000
0.0000
2.6667
0.0000
0.0000
2.7500
0.0000
0.0000
2.8333
0.0000
0.0000
2.9167
0.0000
0.0000
3.0000
0.0000
0.0000
3.0833
0.0000
0.0000
3.1667
0.0000
0.0000
3.2500
0.0000
0.0000
3.3333
0.0000
0.0000
3.4167
0.0000
0.0000
STEWART
Page 125

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
3.5000
0.0000
0.0000
3.5833
0.0000
0.0000
3.6667
0.0000
0.0000
3.7500
0.0000
0.0000
3.8333
0.0000
0.0000
3.9167
0.0000
0.0000
4.0000
0.0000
0.0000
4.0833
0.0000
0.0000
4.1667
0.0000
0.0000
4.2500
0.0000
0.0000
4.3333
0.0000
0.0000
4.4167
0.0000
0.0000
4.5000
0.0000
0.0000
4.5833
0.0000
0.0000
4.6667
0.0000
0.0000
4.7500
0.0000
0.0000
4.8333
0.0000
0.0000
4.9167
0.0000
0.0000
5.0000
0.0000
0.0000
5.0833
0.0000
0.0000
5.1667
0.0000
0.0000
5.2500
0.0000
0.0000
5.3333
0.0000
0.0000
5.4167
0.0000
0.0000
5.5000
0.0000
0.0000
5.5833
0.0000
0.0000
5.6667
0.0000
0.0000
5.7500
0.0000
0.0000
5.8333
0.0000
0.0000
5.9167
0.0000
0.0000
6.0000
0.0000
0.0000
6.0833
0.0000
0.0000
6.1667
0.0000
0.0000
6.2500
0.0000
0.0000
6.3333
0.0000
0.0000
6.4167
0.0000
0.0000
6.5000
0.0000
0.0000
6.5833
0.0000
0.0000
6.6667
0.0000
0.0000
6.7500
0.0000
0.0000
6.8333
0.0000
0.0000
6.9167
0.0000
0.0000
Page 126

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
7.0000
0.0000
0.0000
7.0833
0.0000
0.0000
7.1667
0.0000
0.0000
7.2500
0.0000
0.0000
7.3333
0.0000
0.0000
7.4167
0.0000
0.0000
7.5000
0.0000
0.0000
7.5833
0.0000
0.0000
7.6667
0.0000
0.0000
7.7500
0.0000
0.0000
7.8333
0.0000
0.0000
7.9167
0.0000
0.0000
8.0000
0.0000
0.0000
8.0833
0.0000
0.0000
8.1667
0.0000
0.0000
8.2500
0.0000
0.0000
8.3333
0.0000
0.0000
8.4167
0.0000
0.0000
8.5000
0.0000
0.0000
8.5833
0.0000
0.0000
8.6667
0.0000
0.0000
8.7500
0.0000
0.0005
8.8333
0.0000
0.0006
8.9167
0.0000
0.0026
9.0000
0.0000
0.0054
9.0833
0.0000
0.0079
9.1667
0.0000
0.0105
9.2500
0.0000
0.0133
9.3333
0.0000
0.0158
9.4167
0.0000
0.0184
9.5000
0.0000
0.0207
9.5833
0.0000
0.0227
9.6667
0.0000
0.0252
9.7500
0.0000
0.0282
9.8333
0.0000
0.0313
9.9167
0.0046
0.0348
10.0000
0.0004
0.0390
10.0833
0.0050
0.0436
10.1667
0.0141
0.0484
10.2500
0.0236
0.0536
10.3333
0.0332
0.0596
10.4167
0.0435
0.0661
Page 127

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
10.5000
0.0554
0.0731
10.5833
0.0683
0.0808
10.6667
0.0827
0.0893
10.7500
0.0988
0.0991
10.8333
0.1178
0.1101
10.9167
0.1391
0.1230
11.0000
0.1629
0.1364
11.0833
0.1894
0.1512
11.1667
0.2210
0.1697
11.2500
0.2624
0.1927
11.3333
0.3124
0.2210
11.4167
0.3700
0.2537
11.5000
0.4386
0.2908
11.5833
0.5146
0.3315
11.6667
0.8579
0.5267
11.7500
1.7560
1.0293
11.8333
3.3995
1.8993
11.9167
6.5275
3.3236
12.0000
10.7018
6.2910
12.0833
10.7024
6.5018
12.1667
8.0954
3.9793
12.2500
4.0528
1.8901
12.3333
2.6311
1.2408
12.4167
2.2083
1.0282
12.5000
1.9236
0.8935
12.5833
1.6433
0.7647
12.6667
1.4275
0.6608
12.7500
1.2916
0.5961
12.8333
1.2151
0.5589
12.9167
1.1531
0.5296
13.0000
1.0886
0.5004
13.0833
1.0247
0.4702
13.1667
0.9704
0.4442
13.2500
0.9260
0.4234
13.3333
0.8916
0.4072
13.4167
0.8573
0.3920
13.5000
0.8227
0.3751
13.5833
0.7877
0.3587
13.6667
0.7545
0.3440
13.7500
0.7267
0.3312
13.8333
0.7024
0.3197
13.9167
0.6774
0.3084
Page 128

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
14.0000
0.6522
0.2964
14.0833
0.6256
0.2842
14.1667
0.6047
0.2744
14.2500
0.5900
0.2676
14.3333
0.5796
0.2624
14.4167
0.5720
0.2588
14.5000
0.5630
0.2547
14.5833
0.5545
0.2509
14.6667
0.5456
0.2468
14.7500
0.5369
0.2426
14.8333
0.5295
0.2390
14.9167
0.5202
0.2350
15.0000
0.5118
0.2311
15.0833
0.5023
0.2265
15.1667
0.4934
0.2229
15.2500
0.4852
0.2188
15.3333
0.4762
0.2145
15.4167
0.4679
0.2108
15.5000
0.4583
0.2064
15.5833
0.4491
0.2022
15.6667
0.4399
0.1982
15.7500
0.4308
0.1940
15.8333
0.4221
0.1901
15.9167
0.4130
0.1856
16.0000
0.4041
0.1819
16.0833
0.3938
0.1775
16.1667
0.3858
0.1734
16.2500
0.3806
0.1707
16.3333
0.3769
0.1693
16.4167
0.3745
0.1679
16.5000
0.3710
0.1664
16.5833
0.3677
0.1650
16.6667
0.3647
0.1635
16.7500
0.3616
0.1623
16.8333
0.3587
0.1606
16.9167
0.3551
0.1593
17.0000
0.3525
0.1576
17.0833
0.3490
0.1563
17.1667
0.3458
0.1546
17.2500
0.3428
0.1533
17.3333
0.3393
0.1516
17.4167
0.3366
0.1503
Page 129

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
17.5000
0.3330
0.1487
17.5833
0.3298
0.1473
17.6667
0.3263
0.1457
17.7500
0.3229
0.1443
17.8333
0.3198
0.1433
17.9167
0.3164
0.1417
18.0000
0.3137
0.1403
18.0833
0.3101
0.1387
18.1667
0.3068
0.1367
18.2500
0.3038
0.1353
18.3333
0.3001
0.1339
18.4167
0.2968
0.1324
18.5000
0.2933
0.1307
18.5833
0.2899
0.1293
18.6667
0.2868
0.1277
18.7500
0.2834
0.1263
18.8333
0.2800
0.1251
18.9167
0.2767
0.1235
19.0000
0.2735
0.1217
19.0833
0.2700
0.1203
19.1667
0.2668
0.1187
19.2500
0.2631
0.1174
19.3333
0.2598
0.1157
19.4167
0.2568
0.1144
19.5000
0.2528
0.1127
19.5833
0.2492
0.1111
19.6667
0.2459
0.1096
19.7500
0.2426
0.1077
19.8333
0.2393
0.1064
19.9167
0.2360
0.1047
20.0000
0.2322
0.1034
20.0833
0.2286
0.1017
20.1667
0.2258
0.1004
20.2500
0.2242
0.0994
20.3333
0.2233
0.0990
20.4167
0.2230
0.0990
20.5000
0.2216
0.0984
20.5833
0.2210
0.0980
20.6667
0.2203
0.0980
20.7500
0.2200
0.0980
20.8333
0.2193
0.0974
20.9167
0.2183
0.0970
Page 130

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
21.0000
0.2180
0.0970
21.0833
0.2173
0.0964
21.1667
0.2170
0.0960
21.2500
0.2163
0.0960
21.3333
0.2153
0.0960
21.4167
0.2150
0.0954
21.5000
0.2143
0.0950
21.5833
0.2140
0.0950
21.6667
0.2133
0.0944
21.7500
0.2123
0.0940
21.8333
0.2120
0.0940
21.9167
0.2113
0.0934
22.0000
0.2110
0.0930
22.0833
0.2103
0.0930
22.1667
0.2093
0.0930
22.2500
0.2087
0.0924
22.3333
0.2082
0.0920
22.4167
0.2080
0.0920
22.5000
0.2066
0.0914
22.5833
0.2060
0.0910
22.6667
0.2053
0.0910
22.7500
0.2050
0.0910
22.8333
0.2043
0.0904
22.9167
0.2033
0.0900
23.0000
0.2030
0.0900
23.0833
0.2023
0.0894
23.1667
0.2013
0.0890
23.2500
0.2010
0.0890
23.3333
0.2003
0.0884
23.4167
0.2000
0.0880
23.5000
0.1993
0.0880
23.5833
0.1983
0.0880
23.6667
0.1973
0.0874
23.7500
0.1970
0.0870
23.8333
0.1967
0.0870
23.9167
0.1955
0.0864
24.0000
0.1950
0.0860
Page 131

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER
19
16
14
12
n 10
u
u
0
J
LL g
6
4
2
STEWART
PRE/POST PEAK RUNOFF ANALYSIS I SOUTH OUTFALL - 2YR 24HR DESIGN STORM
0 -----
10.5 11,0 11.5 12.0 12.5 13.0 13.5 14,0
TIME HRS
----- 2YR PRE 2YR POST W ITHOUT DETENTION 2YR POST WITH RETE NTION
TIME 2YR PRE 2YR POST WITHOUT DETENTION
0.0833
0.0000
0.0002
0.1667
0.0000
0.0000
0.2500
0.0000
0.0000
0.3333
0.0000
0.0000
0.4167
0.0000
0.0000
0.5000
0.0000
0.0000
0.5833
0.0000
0.0000
0.6667
0.0000
0.0000
0.7500
0.0000
0.0000
0.8333
0.0000
0.0000
0.9167
0.0000
0.0000
1.0000
0.0000
0.0000
1.0833
0.0000
0.0000
1.1667
0.0000
0.0000
1.2500
0.0000
0.0000
1.3333
0.0000
0.0000
1.4167
0.0000
0.0000
1.5000
0.0000
0.0000
2YR POST WITH DETENTION
0.0002
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
Page 132

PEAK
FLOW ANALYSIS
-
NC AGRICULTURAL
SCIENCES CENTER
1.5833
0.0000
0.0000
0.0000
1.6667
0.0000
0.0000
0.0000
1.7500
0.0000
0.0000
0.0000
1.8333
0.0000
0.0000
0.0000
1.9167
0.0000
0.0000
0.0000
2.0000
0.0000
0.0000
0.0000
2.0833
0.0000
0.0000
0.0000
2.1667
0.0000
0.0000
0.0000
2.2500
0.0000
0.0000
0.0000
2.3333
0.0000
0.0000
0.0000
2.4167
0.0000
0.0000
0.0000
2.5000
0.0000
0.0014
0.0000
2.5833
0.0000
0.0036
0.0000
2.6667
0.0000
0.0046
0.0000
2.7500
0.0000
0.0049
0.0000
2.8333
0.0000
0.0049
0.0000
2.9167
0.0000
0.0049
0.0000
3.0000
0.0000
0.0052
0.0000
3.0833
0.0000
0.0057
0.0000
3.1667
0.0000
0.0059
0.0000
3.2500
0.0000
0.0059
0.0000
3.3333
0.0000
0.0063
0.0000
3.4167
0.0000
0.0068
0.0000
3.5000
0.0000
0.0069
0.0000
3.5833
0.0000
0.0069
0.0000
3.6667
0.0000
0.0070
0.0000
3.7500
0.0000
0.0074
0.0000
3.8333
0.0000
0.0078
0.0000
3.9167
0.0000
0.0079
0.0000
4.0000
0.0000
0.0079
0.0000
4.0833
0.0000
0.0079
0.0000
4.1667
0.0000
0.0080
0.0000
4.2500
0.0000
0.0084
0.0000
4.3333
0.0000
0.0089
0.0000
4.4167
0.0000
0.0089
0.0000
4.5000
0.0000
0.0090
0.0000
4.5833
0.0000
0.0095
0.0000
4.6667
0.0000
0.0099
0.0000
4.7500
0.0000
0.0099
0.0000
4.8333
0.0000
0.0099
0.0000
4.9167
0.0000
0.0100
0.0000
5.0000
0.0000
0.0105
0.0000
STEWART
Page 133

PEAK
FLOW ANALYSIS -
NC AGRICULTURAL
SCIENCES CENTER
5.0833
0.0000
0.0109
0.0000
5.1667
0.0000
0.0109
0.0000
5.2500
0.0000
0.0110
0.0000
5.3333
0.0000
0.0115
0.0000
5.4167
0.0000
0.0120
0.0000
5.5000
0.0000
0.0129
0.0004
5.5833
0.0005
0.0140
0.0016
5.6667
0.0003
0.0148
0.0025
5.7500
0.0016
0.0165
0.0035
5.8333
0.0024
0.0177
0.0046
5.9167
0.0030
0.0181
0.0051
6.0000
0.0039
0.0188
0.0058
6.0833
0.0047
0.0198
0.0067
6.1667
0.0052
0.0209
0.0072
6.2500
0.0061
0.0220
0.0080
6.3333
0.0072
0.0231
0.0090
6.4167
0.0078
0.0241
0.0101
6.5000
0.0083
0.0251
0.0109
6.5833
0.0091
0.0268
0.0112
6.6667
0.0101
0.0282
0.0122
6.7500
0.0110
0.0292
0.0132
6.8333
0.0116
0.0304
0.0143
6.9167
0.0123
0.0317
0.0150
7.0000
0.0133
0.0325
0.0153
7.0833
0.0144
0.0342
0.0163
7.1667
0.0154
0.0353
0.0173
7.2500
0.0160
0.0364
0.0183
7.3333
0.0165
0.0381
0.0193
7.4167
0.0174
0.0393
0.0203
7.5000
0.0183
0.0403
0.0213
7.5833
0.0193
0.0410
0.0220
7.6667
0.0203
0.0415
0.0225
7.7500
0.0213
0.0431
0.0233
7.8333
0.0223
0.0443
0.0243
7.9167
0.0229
0.0453
0.0253
8.0000
0.0234
0.0465
0.0263
8.0833
0.0244
0.0482
0.0273
8.1667
0.0259
0.0527
0.0283
8.2500
0.0274
0.0557
0.0297
8.3333
0.0289
0.0590
0.0317
8.4167
0.0309
0.0620
0.0337
8.5000
0.0329
0.0654
0.0358
STEWART
Page l34

PEAK
FLOW ANALYSIS
-
NC AGRICULTURAL
SCIENCES CENTER
8.5833
0.0350
0.0695
0.0378
8.6667
0.0370
0.0745
0.0403
8.7500
0.0390
0.0781
0.0429
8.8333
0.0416
0.0814
0.0449
8.9167
0.0440
0.0873
0.0473
9.0000
0.0460
0.0937
0.0498
9.0833
0.0486
0.1003
0.0524
9.1667
0.0511
0.1049
0.0549
9.2500
0.0525
0.1092
0.0565
9.3333
0.0541
0.1132
0.0580
9.4167
0.0555
0.1165
0.0595
9.5000
0.0566
0.1197
0.0605
9.5833
0.0576
0.1235
0.0615
9.6667
0.0598
0.1275
0.0635
9.7500
0.0628
0.1344
0.0665
9.8333
0.0660
0.1428
0.0699
9.9167
0.0695
0.1513
0.0740
10.0000
0.0733
0.1603
0.0780
10.0833
0.0773
0.1708
0.0821
10.1667
0.0825
0.1825
0.0873
10.2500
0.0880
0.1953
0.0929
10.3333
0.0937
0.2089
0.0984
10.4167
0.0997
0.2235
0.1047
10.5000
0.1058
0.2406
0.1131
10.5833
0.1126
0.2591
0.1216
10.6667
0.1210
0.2799
0.1315
10.7500
0.1304
0.3047
0.1432
10.8333
0.1404
0.3324
0.1560
10.9167
0.1510
0.3631
0.1719
11.0000
0.1617
0.3959
0.1882
11.0833
0.1739
0.4318
0.2060
11.1667
0.1911
0.4802
0.2303
11.2500
0.2136
0.5436
0.2613
11.3333
0.2374
0.6148
0.2966
11.4167
0.2627
0.6892
0.3348
11.5000
0.2906
0.7732
0.3778
11.5833
0.3221
0.8690
0.4268
11.6667
0.5840
1.5163
0.7536
11.7500
1.2365
3.0592
1.5313
11.8333
2.3288
5.3548
2.6932
11.9167
4.1733
8.8004
4.4992
12.0000
8.0611
15.2704
8.0951
STEWART
Page 135

PEAK
FLOW ANALYSIS
-
NC AGRICULTURAL
SCIENCES CENTER
12.0833
7.3677
14.3774
7.4705
12.1667
3.2712
6.7940
3.7357
12.2500
1.6353
3.2329
2.0566
12.3333
1.2937
2.4265
1.6619
12.4167
1.1569
2.1523
1.5222
12.5000
1.0150
1.8899
1.3818
12.5833
0.8556
1.5959
1.2186
12.6667
0.7403
1.3743
1.0895
12.7500
0.6836
1.2555
1.0122
12.8333
0.6505
1.1884
0.9595
12.9167
0.6198
1.1327
0.9128
13.0000
0.5875
1.0731
0.8628
13.0833
0.5505
1.0041
0.8105
13.1667
0.5188
0.9449
0.7625
13.2500
0.4973
0.9022
0.7236
13.3333
0.4802
0.8692
0.6907
13.4167
0.4639
0.8374
0.6584
13.5000
0.4453
0.8038
0.6254
13.5833
0.4252
0.7678
0.5928
13.6667
0.4063
0.7328
0.5615
13.7500
0.3913
0.7041
0.5326
13.8333
0.3790
0.6811
0.5085
13.9167
0.3670
0.6578
0.4847
14.0000
0.3534
0.6327
0.4604
14.0833
0.3387
0.6054
0.4358
14.1667
0.3276
0.5851
0.4153
14.2500
0.3203
0.5715
0.3987
14.3333
0.3157
0.5619
0.3846
14.4167
0.3117
0.5545
0.3722
14.5000
0.3070
0.5470
0.3605
14.5833
0.3027
0.5380
0.3487
14.6667
0.2971
0.5280
0.3370
14.7500
0.2927
0.5201
0.3265
14.8333
0.2886
0.5123
0.3167
14.9167
0.2834
0.5027
0.3068
15.0000
0.2792
0.4939
0.2975
15.0833
0.2735
0.4856
0.2884
15.1667
0.2688
0.4764
0.2799
15.2500
0.2639
0.4674
0.2707
15.3333
0.2588
0.4588
0.2625
15.4167
0.2549
0.4507
0.2553
15.5000
0.2501
0.4412
0.2478
STEWART
Page 136

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
15.5833
0.2448
0.4327
0.2407
15.6667
0.2392
0.4234
0.2337
15.7500
0.2347
0.4138
0.2266
15.8333
0.2301
0.4059
0.2203
15.9167
0.2249
0.3970
0.2140
16.0000
0.2208
0.3888
0.2082
16.0833
0.2152
0.3783
0.2019
16.1667
0.2108
0.3703
0.1967
16.2500
0.2084
0.3665
0.1934
16.3333
0.2064
0.3629
0.1910
16.4167
0.2044
0.3595
0.1891
16.5000
0.2024
0.3565
0.1868
16.5833
0.2014
0.3534
0.1850
16.6667
0.1994
0.3513
0.1835
16.7500
0.1980
0.3470
0.1809
16.8333
0.1964
0.3431
0.1794
16.9167
0.1944
0.3411
0.1790
17.0000
0.1934
0.3373
0.1769
17.0833
0.1909
0.3345
0.1754
17.1667
0.1894
0.3308
0.1729
17.2500
0.1874
0.3275
0.1714
17.3333
0.1854
0.3253
0.1704
17.4167
0.1841
0.3212
0.1679
17.5000
0.1824
0.3185
0.1664
17.5833
0.1804
0.3150
0.1649
17.6667
0.1784
0.3108
0.1626
17.7500
0.1764
0.3094
0.1621
17.8333
0.1752
0.3066
0.1605
17.9167
0.1734
0.3025
0.1585
18.0000
0.1721
0.2992
0.1569
18.0833
0.1701
0.2953
0.1545
18.1667
0.1682
0.2913
0.1529
18.2500
0.1664
0.2893
0.1514
18.3333
0.1645
0.2865
0.1497
18.4167
0.1625
0.2839
0.1486
18.5000
0.1605
0.2803
0.1465
18.5833
0.1585
0.2763
0.1449
18.6667
0.1565
0.2735
0.1434
18.7500
0.1545
0.2700
0.1415
18.8333
0.1528
0.2674
0.1399
18.9167
0.1513
0.2633
0.1375
19.0000
0.1504
0.2594
0.1359
Page 137

PEAK
FLOW ANALYSIS -
NC AGRICULTURAL
SCIENCES CENTER
19.0833
0.1475
0.2565
0.1345
19.1667
0.1454
0.2524
0.1319
19.2500
0.1434
0.2494
0.1306
19.3333
0.1414
0.2458
0.1292
19.4167
0.1404
0.2437
0.1279
19.5000
0.1390
0.2415
0.1265
19.5833
0.1374
0.2374
0.1239
19.6667
0.1345
0.2343
0.1225
19.7500
0.1329
0.2295
0.1200
19.8333
0.1314
0.2265
0.1185
19.9167
0.1294
0.2239
0.1177
20.0000
0.1275
0.2198
0.1158
20.0833
0.1245
0.2175
0.1145
20.1667
0.1240
0.2150
0.1129
20.2500
0.1229
0.2115
0.1111
20.3333
0.1220
0.2104
0.1105
20.4167
0.1220
0.2099
0.1100
20.5000
0.1220
0.2099
0.1100
20.5833
0.1220
0.2099
0.1100
20.6667
0.1214
0.2099
0.1100
20.7500
0.1210
0.2099
0.1100
20.8333
0.1201
0.2085
0.1095
20.9167
0.1200
0.2074
0.1090
21.0000
0.1200
0.2069
0.1090
21.0833
0.1200
0.2063
0.1084
21.1667
0.1194
0.2059
0.1080
21.2500
0.1190
0.2059
0.1080
21.3333
0.1181
0.2046
0.1075
21.4167
0.1180
0.2039
0.1070
21.5000
0.1180
0.2030
0.1061
21.5833
0.1180
0.2029
0.1060
21.6667
0.1174
0.2029
0.1060
21.7500
0.1170
0.2029
0.1060
21.8333
0.1165
0.2016
0.1055
21.9167
0.1160
0.2004
0.1050
22.0000
0.1160
0.2005
0.1050
22.0833
0.1154
0.2001
0.1050
22.1667
0.1150
0.1984
0.1044
22.2500
0.1150
0.1974
0.1035
22.3333
0.1141
0.1961
0.1030
22.4167
0.1140
0.1959
0.1030
22.5000
0.1134
0.1950
0.1021
STEWART
Page 138

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER STEWART
22.5833
0.1136
0.1958
0.1029
22.6667
0.1134
0.1950
0.1021
22.7500
0.1130
0.1944
0.1015
22.8333
0.1121
0.1931
0.1010
22.9167
0.1120
0.1929
0.1010
23.0000
0.1120
0.1924
0.1010
23.0833
0.1114
0.1919
0.1010
23.1667
0.1110
0.1919
0.1010
23.2500
0.1103
0.1908
0.0999
23.3333
0.1100
0.1891
0.0990
23.4167
0.1100
0.1889
0.0990
23.5000
0.1094
0.1889
0.0990
23.5833
0.1090
0.1889
0.0990
23.6667
0.1089
0.1874
0.0976
23.7500
0.1090
0.1869
0.0970
23.8333
0.1081
0.1857
0.0970
23.9167
0.1074
0.1844
0.0970
24.0000
0.1076
0.1845
0.0970
20
PRE/POST PEAK RUNOFF ANALYSIS I SOUTH OUTFALL - 10YR 24HR DESIGN STORM
10
5
0 -----
10.5 11.0 11.5 12.0 125 13,0 13.5 14,0
TIME HRS
----- 10YR PRE - 10YR POST WITHOUT DETENTION - 10YR POST WITH DETENTION
Page 139

PEAK FLOW ANALYSIS -
NC AGRICULTURAL SCIENCES CENTER
TIME
0.0833
0.1667
0.2500
0.3333
0.4167
0.5000
0.5833
0.6667
0.7500
0.8333
0.9167
1.0000
1.0833
1.1667
1.2500
1.3333
1.4167
1.5000
1.5833
1.6667
1.7500
1.8333
1.9167
2.0000
2.0833
2.1667
2.2500
2.3333
2.4167
2.5000
2.5833
2.6667
2.7500
2.8333
2.9167
3.0000
3.0833
3.1667
3.2500
3.3333
3.4167
10YR PRE
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
10YR POST WITHOUT DETENTION
0.0002
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0009
0.0054
0.0068
0.0074
0.0078
0.0080
0.0084
0.0089
0.0095
0.0099
0.0100
0.0105
0.0109
0.0114
0.0118
0.0119
0.0120
0.0126
0.0129
0.0130
0.0136
STEWART
10YR POST WITH DETENTION
0.0002
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
0.0000
Page 140

PEAK
FLOW ANALYSIS
-
NC AGRICULTURAL
SCIENCES CENTER
3.5000
0.0000
0.0139
0.0000
3.5833
0.0000
0.0139
0.0000
3.6667
0.0000
0.0140
0.0000
3.7500
0.0000
0.0147
0.0000
3.8333
0.0000
0.0151
0.0000
3.9167
0.0000
0.0161
0.0005
4.0000
0.0001
0.0178
0.0021
4.0833
0.0011
0.0196
0.0035
4.1667
0.0025
0.0209
0.0047
4.2500
0.0038
0.0222
0.0059
4.3333
0.0049
0.0246
0.0076
4.4167
0.0061
0.0260
0.0090
4.5000
0.0071
0.0273
0.0101
4.5833
0.0084
0.0291
0.0111
4.6667
0.0100
0.0313
0.0124
4.7500
0.0112
0.0331
0.0141
4.8333
0.0123
0.0346
0.0153
4.9167
0.0133
0.0370
0.0163
5.0000
0.0148
0.0386
0.0176
5.0833
0.0164
0.0403
0.0192
5.1667
0.0174
0.0421
0.0203
5.2500
0.0185
0.0436
0.0216
5.3333
0.0200
0.0454
0.0232
5.4167
0.0213
0.0471
0.0243
5.5000
0.0224
0.0487
0.0256
5.5833
0.0239
0.0506
0.0273
5.6667
0.0253
0.0535
0.0287
5.7500
0.0269
0.0553
0.0303
5.8333
0.0284
0.0563
0.0314
5.9167
0.0294
0.0579
0.0328
6.0000
0.0310
0.0632
0.0344
6.0833
0.0324
0.0662
0.0358
6.1667
0.0340
0.0691
0.0374
6.2500
0.0354
0.0726
0.0388
6.3333
0.0370
0.0748
0.0404
6.4167
0.0385
0.0770
0.0419
6.5000
0.0400
0.0797
0.0434
6.5833
0.0415
0.0823
0.0449
6.6667
0.0431
0.0851
0.0464
6.7500
0.0445
0.0887
0.0479
6.8333
0.0461
0.0942
0.0494
6.9167
0.0475
0.0976
0.0509
STEWART
Page 141

PEAK
FLOW ANALYSIS
-
NC AGRICULTURAL
SCIENCES CENTER
7.0000
0.0491
0.1011
0.0527
7.0833
0.0505
0.1053
0.0542
7.1667
0.0521
0.1094
0.0559
7.2500
0.0535
0.1127
0.0575
7.3333
0.0551
0.1168
0.0590
7.4167
0.0568
0.1211
0.0605
7.5000
0.0583
0.1250
0.0620
7.5833
0.0602
0.1295
0.0640
7.6667
0.0616
0.1337
0.0655
7.7500
0.0632
0.1373
0.0670
7.8333
0.0648
0.1412
0.0689
7.9167
0.0664
0.1461
0.0704
8.0000
0.0682
0.1507
0.0720
8.0833
0.0695
0.1541
0.0738
8.1667
0.0718
0.1592
0.0758
8.2500
0.0752
0.1674
0.0791
8.3333
0.0790
0.1769
0.0831
8.4167
0.0826
0.1861
0.0875
8.5000
0.0865
0.1979
0.0933
8.5833
0.0911
0.2108
0.0991
8.6667
0.0961
0.2230
0.1049
8.7500
0.1005
0.2346
0.1105
8.8333
0.1049
0.2468
0.1163
8.9167
0.1094
0.2592
0.1218
9.0000
0.1142
0.2746
0.1298
9.0833
0.1193
0.2896
0.1375
9.1667
0.1235
0.3030
0.1439
9.2500
0.1263
0.3126
0.1493
9.3333
0.1283
0.3206
0.1543
9.4167
0.1297
0.3288
0.1587
9.5000
0.1313
0.3359
0.1621
9.5833
0.1328
0.3431
0.1658
9.6667
0.1364
0.3539
0.1716
9.7500
0.1420
0.3721
0.1808
9.8333
0.1485
0.3927
0.1912
9.9167
0.1555
0.4151
0.2026
10.0000
0.1634
0.4390
0.2142
10.0833
0.1714
0.4643
0.2269
10.1667
0.1818
0.4944
0.2425
10.2500
0.1967
0.5271
0.2594
10.3333
0.2131
0.5608
0.2762
10.4167
0.2299
0.5962
0.2941
STEWART
Page 142

PEAK
FLOW ANALYSIS
-
NC AGRICULTURAL
SCIENCES CENTER
10.5000
0.2476
0.6339
0.3131
10.5833
0.2679
0.6754
0.3349
10.6667
0.2919
0.7235
0.3602
10.7500
0.3195
0.7800
0.3889
10.8333
0.3489
0.8421
0.4205
10.9167
0.3798
0.9043
0.4522
11.0000
0.4133
0.9706
0.4863
11.0833
0.4506
1.0459
0.5251
11.1667
0.5030
1.1484
0.5779
11.2500
0.5708
1.2847
0.6481
11.3333
0.6440
1.4321
0.7229
11.4167
0.7225
1.5863
0.8019
11.5000
0.8125
1.7576
0.8903
11.5833
0.9140
1.9502
0.9899
11.6667
1.6821
3.4399
1.7557
11.7500
3.3144
6.5865
3.4171
11.8333
5.7113
10.9656
5.7401
11.9167
9.7426
16.9836
9.3389
12.0000
17.0260
22.5172
15.3356
12.0833
14.4559
22.2859
15.0068
12.1667
6.3412
17.4502
7.7942
12.2500
3.1129
6.0602
4.8286
12.3333
2.4877
4.2732
4.1072
12.4167
2.2232
3.7863
3.7841
12.5000
1.9419
3.3122
3.4564
12.5833
1.6308
2.7893
3.0917
12.6667
1.4104
2.3977
2.7908
12.7500
1.3005
2.1945
2.5896
12.8333
1.2358
2.0777
2.4365
12.9167
1.1770
1.9767
2.2982
13.0000
1.1125
1.8673
2.1597
13.0833
1.0404
1.7456
2.0189
13.1667
0.9803
1.6424
1.8929
13.2500
0.9386
1.5688
1.7873
13.3333
0.9118
1.5095
1.6937
13.4167
0.8726
1.4549
1.6063
13.5000
0.8375
1.3946
1.5199
13.5833
0.7977
1.3287
1.4338
13.6667
0.7625
1.2689
1.3540
13.7500
0.7347
1.2197
1.2835
13.8333
0.7098
1.1784
1.2194
13.9167
0.6871
1.1380
1.1588
STEWART
Page 143

PEAK
FLOW ANALYSIS
-
NC AGRICULTURAL
SCIENCES CENTER
14.0000
0.6609
1.0949
1.0993
14.0833
0.6319
1.0478
1.0394
14.1667
0.6108
1.0100
0.9869
14.2500
0.5976
0.9873
0.9446
14.3333
0.5888
0.9719
0.9079
14.4167
0.5817
0.9583
0.8743
14.5000
0.5723
0.9431
0.8420
14.5833
0.5633
0.9279
0.8110
14.6667
0.5526
0.9109
0.7810
14.7500
0.5436
0.8953
0.7528
14.8333
0.5354
0.8802
0.7267
14.9167
0.5273
0.8658
0.7019
15.0000
0.5183
0.8530
0.6785
15.0833
0.5076
0.8347
0.6530
15.1667
0.4988
0.8181
0.6301
15.2500
0.4886
0.8024
0.6086
15.3333
0.4803
0.7876
0.5881
15.4167
0.4723
0.7739
0.5690
15.5000
0.4624
0.7605
0.5507
15.5833
0.4534
0.7438
0.5310
15.6667
0.4419
0.7263
0.5118
15.7500
0.4325
0.7097
0.4936
15.8333
0.4245
0.6951
0.4770
15.9167
0.4154
0.6805
0.4608
16.0000
0.4064
0.6654
0.4452
16.0833
0.3948
0.6470
0.4284
16.1667
0.3885
0.6342
0.4140
16.2500
0.3834
0.6255
0.4030
16.3333
0.3800
0.6202
0.3943
16.4167
0.3774
0.6158
0.3863
16.5000
0.3738
0.6103
0.3775
16.5833
0.3704
0.6045
0.3692
16.6667
0.3667
0.5986
0.3618
16.7500
0.3634
0.5932
0.3542
16.8333
0.3608
0.5882
0.3482
16.9167
0.3577
0.5826
0.3416
17.0000
0.3544
0.5771
0.3350
17.0833
0.3507
0.5702
0.3282
17.1667
0.3474
0.5654
0.3226
17.2500
0.3440
0.5605
0.3175
17.3333
0.3405
0.5547
0.3117
17.4167
0.3378
0.5498
0.3064
STEWART
Page 144

PEAK
FLOW ANALYSIS
-
NC AGRICULTURAL
SCIENCES CENTER
17.5000
0.3337
0.5452
0.3023
17.5833
0.3304
0.5384
0.2972
17.6667
0.3267
0.5319
0.2920
17.7500
0.3236
0.5253
0.2866
17.8333
0.3214
0.5214
0.2831
17.9167
0.3177
0.5158
0.2795
18.0000
0.3144
0.5108
0.2755
18.0833
0.3107
0.5046
0.2709
18.1667
0.3074
0.4985
0.2670
18.2500
0.3037
0.4917
0.2634
18.3333
0.3004
0.4872
0.2598
18.4167
0.2974
0.4815
0.2560
18.5000
0.2937
0.4766
0.2535
18.5833
0.2904
0.4710
0.2503
18.6667
0.2867
0.4659
0.2470
18.7500
0.2834
0.4593
0.2433
18.8333
0.2798
0.4534
0.2405
18.9167
0.2764
0.4476
0.2374
19.0000
0.2734
0.4426
0.2346
19.0833
0.2698
0.4357
0.2312
19.1667
0.2664
0.4300
0.2278
19.2500
0.2626
0.4252
0.2252
19.3333
0.2594
0.4184
0.2218
19.4167
0.2563
0.4143
0.2194
19.5000
0.2527
0.4077
0.2162
19.5833
0.2495
0.4022
0.2138
19.6667
0.2449
0.3957
0.2102
19.7500
0.2411
0.3908
0.2068
19.8333
0.2385
0.3850
0.2036
19.9167
0.2355
0.3801
0.2016
20.0000
0.2318
0.3750
0.1989
20.0833
0.2275
0.3689
0.1953
20.1667
0.2254
0.3639
0.1934
20.2500
0.2234
0.3605
0.1915
20.3333
0.2230
0.3593
0.1904
20.4167
0.2230
0.3589
0.1900
20.5000
0.2214
0.3581
0.1900
20.5833
0.2210
0.3579
0.1900
20.6667
0.2201
0.3560
0.1888
20.7500
0.2200
0.3531
0.1871
20.8333
0.2194
0.3529
0.1870
20.9167
0.2181
0.3523
0.1864
STEWART
Page 145

PEAK
FLOW ANALYSIS
-
NC AGRICULTURAL
SCIENCES CENTER
21.0000
0.2180
0.3519
0.1860
21.0833
0.2174
0.3508
0.1860
21.1667
0.2161
0.3500
0.1860
21.2500
0.2160
0.3480
0.1848
21.3333
0.2160
0.3451
0.1831
21.4167
0.2144
0.3449
0.1830
21.5000
0.2140
0.3443
0.1824
21.5833
0.2140
0.3439
0.1820
21.6667
0.2124
0.3431
0.1820
21.7500
0.2120
0.3429
0.1820
21.8333
0.2111
0.3410
0.1808
21.9167
0.2104
0.3381
0.1791
22.0000
0.2104
0.3379
0.1790
22.0833
0.2093
0.3373
0.1784
22.1667
0.2090
0.3361
0.1780
22.2500
0.2074
0.3359
0.1780
22.3333
0.2070
0.3344
0.1768
22.4167
0.2070
0.3323
0.1760
22.5000
0.2054
0.3301
0.1751
22.5833
0.2050
0.3299
0.1750
22.6667
0.2041
0.3285
0.1744
22.7500
0.2040
0.3279
0.1740
22.8333
0.2036
0.3275
0.1740
22.9167
0.2022
0.3257
0.1728
23.0000
0.2020
0.3243
0.1720
23.0833
0.2020
0.3221
0.1711
23.1667
0.2004
0.3219
0.1710
23.2500
0.2000
0.3205
0.1704
23.3333
0.1991
0.3199
0.1700
23.4167
0.1990
0.3199
0.1700
23.5000
0.1984
0.3179
0.1688
23.5833
0.1980
0.3163
0.1680
23.6667
0.1964
0.3147
0.1671
23.7500
0.1960
0.3139
0.1670
23.8333
0.1951
0.3125
0.1664
23.9167
0.1950
0.3119
0.1654
24.0000
0.1950
0.3114
0.1656
STEWART
Page 146

STEWART
Project:
Project No:
State
County
Return Period
Rainfall Depth
Distribution
NC Agricultural Science Center Date: 9.20.2018
C16123 By: NBC
North Carolina
Wake
10
5.7
SCS Type 1124 -hr
Revision -

19
STEWART
Project:
Project No:
PIPE NETWORK
NC Agricultural Science Center
C16123
SUMMARY 10 YEAR EVENT
Date:
By:
9.20.2018
NBC
Revision:
-
Start Structure
End Structure
Length (ft) Inlet Invert
Outlet Invert
Slope (%)
Diameter (in)
Max Flow Depth (ft)
Flow Capacity (cfs)
Peak Flow (cfs)
02 -JB
01 -HW
112.42
423.18
422.03
1.02
24.00
0.89
22.88
12.44
11 -JB
10 -HW
124.12
410.40
407.70
2.18
30.00
2.01
60.50
47.22
12 -RI
11 -JB
105.98
413.50
410.60
2.74
30.00
2.18
67.85
47.25
21 -AD
BACKBIO
123.10
416.73
415.50
1.00
30.00
1.92
41.00
28.93
43 -CB
42 -CB
58.22
421.21
419.85
2.34
15.00
0.36
9.87
0.97
22 -AD
21 -AD
104.59
417.75
416.93
0.78
30.00
1.80
36.32
24.98
23 -AD
22 -AD
192.17
421.00
418.00
1.56
18.00
0.97
13.12
2.55
24 -AD
22 -AD
104.85
418.75
417.95
0.76
24.00
1.85
19.76
18.58
25 -AD
24 -AD
115.42
421.08
418.95
1.85
24.00
1.37
30.73
12.47
26 -CB
25 -AD
64.61
423.00
421.28
2.66
24.00
0.88
36.91
12.31
27 -JB
26 -CB
72.25
423.82
423.10
1.00
15.00
0.67
6.45
1.76
28 -AD
26 -CB
86.66
425.30
424.20
1.27
24.00
0.92
25.49
9.83
30 -CB
28 -AD
19.63
425.80
425.50
1.53
24.00
0.77
27.97
3.87
32 -CB
30 -CB
133.46
433.40
426.50
5.17
15.00
0.31
14.90
2.00
33 -CB
32 -CB
24.63
434.00
433.60
1.62
15.00
0.32
8.23
0.89
45-C132
41 -JB
81.58
417.13
416.30
1.02
30.00
1.53
41.37
16.17
46 -CB
45-CB2
98.70
418.53
417.53
1.01
18.00
1.11
10.57
8.24
47 -CB
46 -CB
39.59
419.33
418.93
1.01
15.00
1.17
6.49
7.63
50 -AD
45-C132
179.23
423.50
418.00
3.07
15.00
0.57
11.32
4.55
45 -CB
50 -AD
35.78
424.67
423.60
2.99
15.00
0.50
11.17
2.79
52 -CB
45 -CB
23.99
425.01
424.77
1.00
15.00
0.54
6.46
2.08
03 -AD
02 -JB
43.58
423.71
423.28
0.99
15.00
1.05
6.42
0.96
63 -JB
62 -CB
58.28
441.56
441.21
0.60
15.00
0.68
5.01
1.90
62 -CB
61 -AD
63.86
441.11
440.73
0.60
15.00
0.93
4.98
2.61
61 -AD
FRONTBIO
104.67
440.63
440.00
0.60
18.00
1.04
8.15
6.34
31 -CB
30 -CB
23.97
426.50
426.20
1.25
18.00
0.41
11.75
1.60
35 -JB
34 -HW
14.00
440.16
440.02
1.00
15.00
1.10
5.60
5.53
36 -AD
35 -JB
69.47
441.05
440.36
0.99
15.00
0.91
5.58
2.58
37 -CB
36 -AD
21.70
441.50
441.25
1.15
15.00
0.58
6.01
2.28
38 -CB
37 -CB
131.55
443.01
441.70
1.00
15.00
0.48
5.59
1.69
48 -CB
47 -CB
77.18
423.87
420.70
4.11
15.00
0.49
13.09
3.61

STEWART
Project:
Project No:
Start Structure
44 -CB
71 -RI
72 -JB
70 -RI
41 -JB
42 -CB
Pre -Soil -Park -Inlet
post_exst_jb
offsite -02
73 -AD
74 -CB -EX
post_west_offsite inlet
Pre -NE -Inlet
Pre_southJB
NC Agricultural Science Center
C16123
End Structure
41 -JB
70 -RI
71 -RI
Post -South Outfa
BACKBIO
41 -JB
Pre_southJB
Post -ext -NE -FES
offsite 01
72 -JB
72 -JB
02 -JB
Pre_N E_h W
Pre -south -outfall
Date: 9.20.2018
By: NBC
Length (ft)
Inlet Invert
Outlet Invert
Slope (%)
Diameter (in)
64.71
421.00
420.00
1.55
15.00
63.18
434.02
433.39
1.00
18.00
89.00
436.70
435.22
1.66
18.00
107.19
433.29
429.62
3.42
24.00
31.73
416.30
416.00
0.95
30.00
92.99
419.85
418.71
1.23
18.00
159.00
437.77
436.90
0.55
15.00
108.79
0.00
0.00
0.00
18.00
166.00
0.00
0.00
0.00
24.00
52.74
437.73
437.20
1.00
18.00
59.20
437.77
437.52
0.42
15.00
146.00
429.12
423.18
4.07
24.00
107.00
436.89
435.98
0.85
15.00
110.00
433.29
429.62
3.34
24.00
Revision: -
Max Flow Depth (ft)
Flow Capacity (cfs)
Peak Flow (cfs)
0.38
6.96
1.32
1.40
10.49
12.76
1.35
11.74
12.06
0.92
41.86
16.24
1.55
39.88
19.16
0.45
10.08
1.83
1.19
4.14
8.49
0.78
8.33
6.63
0.72
45.60
12.07
1.25
9.13
3.85
1.20
3.64
8.58
1.07
39.55
12.04
0.81
5.16
10.70
1.06
35.81
17.17

N
STEWART
Project: NC Agricultural Science Center Date: 9.20.2018
Project No: C16123 By: NBC
SUBBASIN SUMMARY 10 YEAR EVENT
Sub -Basin
Area (ac) Outlet Structure
Weighted Curve
Total Runnoff (in) Peak Runnoff
Number
(cfs)
{Site 1}.DA-23
0.34 23 -AD
96.98
5.34
2.57
{Site 1}.DA-26
0.11 26 -CB
96.92
5.33
0.81
{Site 1}.DA-30
0.04 30 -CB
97.89
5.44
0.29
{Site 1}.DA-31
0.47 31 -CB
65.68
2.19
1.63
{Site 1}.DA-33
0.25 33 -CB
66.96
2.3
0.9
{Site 1}.DA-43
0.14 43 -CB
94.23
5.02
0.98
{Site 1}.DA-46
0.09 46 -CB
98
5.46
0.62
{Site 1}.DA-52
0.28 52 -CB
96.21
5.25
2.08
{Site 1}.DA-62
0.12 62 -CB
89.54
4.5
0.78
{Site 1}.DA-63
0.25 63 -JB
98
5.46
1.91
DA -03
0.94 03 -AD
58.33
1.6
2.23
DA -12
0.8 BACKBIO
98
5.46
5.98
DA -21
0.66 MEDIAN4
86.58
4.19
4.25
DA -22
0.66 MEDIAN3
86.94
4.22
4.28
DA -24
1 MEDIAN2
86.58
4.19
6.48
DA -25
0.07 25 -AD
61
1.81
0.21
DA -27
0.26 27 -JB
88.83
4.43
1.76
DA -28
0.18 28 -AD
61.08
1.81
0.51
DA -32
0.2 32 -CB
79.42
3.45
1.12
DA -36
0.08 36 -AD
66.99
2.3
0.3
DA -37
0.11 37 -CB
79.5
3.46
0.6
DA -38
0.31 38 -CB
79.72
3.48
1.73
DA -42
0.2 42 -CB
93.4
4.93
1.43
DA -44
0.19 44 -CB
93.06
4.89
1.33
DA -45
0.5 45-CB2
91.77
4.75
3.52
DA -47
0.55 47 -CB
96.81
5.32
4.14
DA -48
0.48 48 -CB
97.69
5.43
3.58
DA -50
0.45 50 -AD
69.07
2.49
1.76
DA -51
0.09 45 -CB
97.76
5.43
0.72
DA -61
0.65 MEDIANI
84.21
3.94
4.01
DA -70
0.84 70 -RI
71.79
2.73
3.64
Time of
Concentration (days
hh:mm:ss)
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
0 00:05:00
Revision: -

DA -74
1.26 74 -CB -EX
89.46
4.5
8.57
0 00:05:00
DA -80
0.41 35 -JB
98
5.46
3.06
0 00:05:00
North_bypass
1.7 Channel -convergence
61
1.81
4.7
0 00:05:00
post_east_offsite DA
1.66 post_exst ib
72.62
2.81
6.98
0 00:07:00
Post_west_offsite
2.45 post_west_offsite inlet
75.91
3.11
12.13
0 00:05:00
Pre -North -Offsite
2.45 offsite -02
75.93
3.12
12.14
0 00:05:00
Pre -North -onsite
9.86 offsite 01
61.51
1.85
24.68
0 00:10:00
Pre -Soil -Parking
1.26 Pre -Soil -Park -Inlet
88.9
4.43
8.49
0 00:05:00
Pre -East -DA
4.13 Pre -NE -Inlet
67.19
2.32
14.17
0 00:07:00
Pre -South -onsite
2.53 Pre south JB
65.93
2.21
8.78
0 00:05:00
southbio
1.47 FRONTBIO
79.98
3.51
8.16
0 00:05:00
Sub -73
0.84 73 -AD
74.27
2.96
3.95
0 00:05:00

STEWART
Project: NC Agricultural Science Center Date:
Project No: C16123 By:
Inlet Structure
Invert
Rim
Clogging Factor Longitudinal Slope
(ft/ft)
(ft) (cfs)
Bypassed
( % ) (ft/ft)
03 -AD
423.71
427.96
0 N/A
21 -AD
416.73
420.33
0 N/A
22 -AD
417.75
420.39
0 N/A
23 -AD
421
425.72
0 N/A
24 -AD
418.75
421.33
0 N/A
25 -AD
421.08
426
0 N/A
26 -CB
422.99
427.2
0 N/A
27-J B
423.82
428.09
0 N/A
28 -AD
425.3
429
0 N/A
30 -CB
425.8
431.51
0 N/A
31 -CB
426.5
431.5
0 N/A
32 -CB
433.599
437.83
0 N/A
33 -CB
434
437.83
0 N/A
36 -AD
441.05
445
0 N/A
37 -CB
441.5
445.25
0 N/A
38 -CB
443.01
445.45
0 N/A
42 -CB
419.85
423.33
0 N/A
43 -CB
421.21
426.41
0 N/A
44 -CB
421
424.68
0 N/A
45 -CB
424.67
429.8
0 N/A
45-CB2
417.13
424
0 N/A
46 -CB
418.53
424.12
0 N/A
47 -CB
419.33
424.13
0 N/A
48 -CB
423.87
427.94
0 N/A
50 -AD
423.5
427
0 N/A
52 -CB
425.01
429.88
0 N/A
61 -AD
440.63
442.83
0 N/A
62 -CB
441.11
445.11
0 N/A
70 -RI
433.29
439
0 N/A
9.20.2018 Revision: -
NBC
Roadway Cross Slope
Max Spread Flow Intercepted
Flow
Peak Flow
(ft/ft)
(ft) (cfs)
Bypassed
(cfs)
0.02
11.07 N/A
N/A
2.17
0.02
0 N/A
N/A
0
0.02
0 N/A
N/A
0
0.02
12.49 N/A
N/A
2.57
0.02
0 N/A
N/A
0
0.02
1.28 N/A
N/A
0.21
0.02
4.42 N/A
N/A
0.81
0.02
8.41 N/A
N/A
1.76
0.02
3.12 N/A
N/A
0.5
0.02
1.57 N/A
N/A
0.29
0.02
7.8 N/A
N/A
1.6
0.02
5.91 N/A
N/A
1.12
0.02
4.89 N/A
N/A
0.9
0.02
1.84 N/A
N/A
0.3
0.02
3.25 N/A
N/A
0.59
0.02
8.24 N/A
N/A
1.72
0.02
8 N/A
N/A
1.43
0.02
5.33 N/A
N/A
0.98
0.02
6.73 N/A
N/A
1.33
0.02
3.91 N/A
N/A
0.72
0.02
14.04 N/A
N/A
3.51
0.02
3.4 N/A
N/A
0.62
0.02
15.8 N/A
N/A
4.14
0.02
14.24 N/A
N/A
3.58
0.02
9.38 N/A
N/A
1.75
0.02
9.59 N/A
N/A
2.08
0.02
0 N/A
N/A
0
0.02
4.28 N/A
N/A
0.78
0.02
15.99 N/A
N/A
3.61

71 -RI
434.02
439
0 N/A
0.02
0 N/A
N/A
0
73 -AD
437.73
440
20 N/A
0.02
16.24 N/A
N/A
3.93
74 -CB -EX
437.77
442.72
0 N/A
0.02
27.77 N/A
N/A
8.56
offsite -02
429.12
435
0 N/A
0.02
56.17 N/A
N/A
12.08
post_exst ib
436.89
445
0 N/A
0.02
15.07 N/A
N/A
6.63
post_west_offsite inlet
429.12
435
0 N/A
0.02
56.17 N/A
N/A
12.08
Pre -NE -Inlet
436.89
445
0 N/A
0.02
70.03 N/A
N/A
13.46
Pre -Soil -Park -Inlet
437.77
443
0 N/A
0.02
27.19 N/A
N/A
8.48

Revision: -
STEWART
Project:
NC Agricultural Science Center
Date: 9.20.2018
Project No:
C16123
By: NBC
SCM Name
Initial Water
Peak Inflow Peak Outflow
Maximum Stage Maximum Depth
Elevvation
(Cf S) (Cf S)
BACKBIO
415.5
53.33
47.25
417.43
1.93
FRONTBIO
439
14.19
1.91
440.82
1.82
MEDIAN 1
442
4
3.78
442.6
0.6
MEDIAN2
421
6.47
6.17
421.7
0.7
MEDIAN3
420
4.28
4.03
420.67
0.67
MEDIAN4
420
4.25
4.17
420.62
0.62
MEDIAN5
423
2.02
1.94
423.5
0.5
Revision: -

r�A
STEWART
Project:
Prosect No:
State
County
Return Period
Rainfall Depth
Distribution
NC Agricultural Science Center Date: 9.20.2018
C16123 By: NBC
North Carolina
Wake
25
6.6
SCS Type 11 24 -hr
Revision -

STEWART
Project:
Project No:
NC Agricultural Science Center
C16123
Date: 9.20.2018
By: NBC
Sub -Basin
Area (ac) Outlet Structure
Weighted Curve
Total Runnoff (in) Peak Runnoff
Time of
Number
(cfs)
Concentration (days
hh:mm:ss)
{Site 1).DA-23
0.34 23 -AD
96.98
6.24
2.98
0 00:05:00
{Site 1).DA-26
0.11 26 -CB
96.92
6.23
0.94
0 00:05:00
{Site 1).DA-30
0.04 30 -CB
97.89
6.34
0.33
0 00:05:00
{Site 1).DA-31
0.47 31 -CB
65.68
2.86
2.15
0 00:05:00
{Site 1).DA-33
0.25 33 -CB
66.96
2.99
1.18
0 00:05:00
{Site 1).DA-43
0.14 43 -CB
94.23
5.92
1.14
0 00:05:00
{Site 1).DA-46
0.09 46 -CB
98
6.36
0.72
0 00:05:00
{Site 1).DA-52
0.28 52 -CB
96.21
6.15
2.42
0 00:05:00
{Site 1).DA-62
0.12 62 -CB
89.54
5.38
0.93
0 00:05:00
{Site 1).DA-63
0.25 63 -JB
98
6.36
2.22
0 00:05:00
DA -03
0.94 03 -AD
58.33
2.17
3.12
0 00:05:00
DA -12
0.8 BACKBIO
98
6.36
6.94
0 00:05:00
DA -21
0.66 MEDIAN4
86.58
5.05
5.07
0 00:05:00
DA -22
0.66 MEDIAN3
86.94
5.09
5.1
0 00:05:00
DA -24
1 MEDIAN2
86.58
5.05
7.73
0 00:05:00
DA -25
0.07 25 -AD
61
2.42
0.29
0 00:05:00
DA -27
0.26 27 -JB
88.83
5.3
2.09
0 00:05:00
DA -28
0.18 28 -AD
61.08
2.42
0.7
0 00:05:00
DA -32
0.2 32 -CB
79.42
4.26
1.37
0 00:05:00
DA -36
0.08 36 -AD
66.99
2.99
0.39
0 00:05:00
DA -37
0.11 37 -CB
79.5
4.27
0.73
0 00:05:00
DA -38
0.31 38 -CB
79.72
4.3
2.12
0 00:05:00
DA -42
0.2 42 -CB
93.4
5.82
1.67
0 00:05:00
DA -44
0.19 44 -CB
93.06
5.78
1.56
0 00:05:00
DA -45
0.5 45-CB2
91.77
5.63
4.13
0 00:05:00
DA -47
0.55 47 -CB
96.81
6.22
4.8
0 00:05:00
DA -48
0.48 48 -CB
97.69
6.32
4.16
0 00:05:00
DA -50
0.45 50 -AD
69.07
3.2
2.27
0 00:05:00
DA -51
0.09 45 -CB
97.76
6.33
0.83
0 00:05:00
DA -61
0.65 MEDIANI
84.21
4.78
4.82
0 00:05:00
DA -70
0.84 70 -RI
71.79
3.47
4.63
0 00:05:00
Revision: -

DA -74
1.26 74 -CB -EX
89.46
5.37
10.13
0 00:05:00
DA -80
0.41 35 -JB
98
6.36
3.55
0 00:05:00
North_bypass
1.7 Channel -convergence
61
2.42
6.41
0 00:05:00
post_east_offsiteDA
1.66 post_exst ib
72.62
3.55
8.85
0 00:07:00
Post -west -offsite
2.45 post_west_offsite inlet
75.91
3.89
15.12
0 00:05:00
Pre -North -Offsite
2.45 offsite -02
75.93
3.9
15.13
0 00:05:00
Pre -North -onsite
9.86 offsite 01
61.51
2.47
33.32
0 00:10:00
Pre -Soil -Parking
1.26 Pre -Soil -Park -Inlet
88.9
5.31
10.06
0 00:05:00
Pre -East -DA
4.13 Pre -NE -Inlet
67.19
3.01
18.51
0 00:07:00
Pre -South -onsite
2.53 Pre south JB
65.93
2.89
11.55
0 00:05:00
southbio
1.47 FRONTBIO
79.98
4.33
10
0 00:05:00
Sub -73
0.84 73 -AD
74.27
3.72
4.96
0 00:05:00

STEWART
Project: NC Agricultural Science Center Date:
Project No: C16123 By:
Inlet Structure
Invert
Rim
Clogging Factor Longitudinal Slope
(ft/ft)
(ft) (cfs)
Bypassed
( % ) (ft/ft)
03 -AD
423.71
427.96
0 N/A
21 -AD
416.73
420.33
0 N/A
22 -AD
417.75
420.39
0 N/A
23 -AD
421
425.72
0 N/A
24 -AD
418.75
421.33
0 N/A
25 -AD
421.08
426
0 N/A
26 -CB
422.99
427.2
0 N/A
27 -JB
423.82
428.09
0 N/A
28 -AD
425.3
429
0 N/A
30 -CB
425.8
431.51
0 N/A
31 -CB
426.5
431.5
0 N/A
32 -CB
433.599
437.83
0 N/A
33 -CB
434
437.83
0 N/A
36 -AD
441.05
445
0 N/A
37 -CB
441.5
445.25
0 N/A
38 -CB
443.01
445.45
0 N/A
42 -CB
419.85
423.33
0 N/A
43 -CB
421.21
426.41
0 N/A
44 -CB
421
424.68
0 N/A
45 -CB
424.67
429.8
0 N/A
45-C132
417.13
424
0 N/A
46 -CB
418.53
424.12
0 N/A
47 -CB
419.33
424.13
0 N/A
48 -CB
423.87
427.94
0 N/A
50 -AD
423.5
427
0 N/A
52 -CB
425.01
429.88
0 N/A
61 -AD
440.63
442.83
0 N/A
62 -CB
441.11
445.11
0 N/A
70 -RI
433.29
439
0 N/A
9.20.2018 Revision: -
NBC
Roadway Cross Slope
Max Spread Flow Intercepted
Flow
Peak Flow
(ft/ft)
(ft) (cfs)
Bypassed
(cfs)
0.02
14.21 N/A
N/A
3.05
0.02
0 N/A
N/A
0
0.02
0 N/A
N/A
0
0.02
13.97 N/A
N/A
2.98
0.02
0 N/A
N/A
0
0.02
1.76 N/A
N/A
0.28
0.02
5.13 N/A
N/A
0.94
0.02
9.61 N/A
N/A
2.09
0.02
4.27 N/A
N/A
0.69
0.02
1.82 N/A
N/A
0.33
0.02
9.72 N/A
N/A
2.13
0.02
6.89 N/A
N/A
1.37
0.02
6.13 N/A
N/A
1.17
0.02
2.42 N/A
N/A
0.39
0.02
3.98 N/A
N/A
0.73
0.02
9.68 N/A
N/A
2.11
0.02
9.03 N/A
N/A
1.67
0.02
6 N/A
N/A
1.14
0.02
7.6 N/A
N/A
1.56
0.02
4.54 N/A
N/A
0.83
0.02
15.78 N/A
N/A
4.13
0.02
3.94 N/A
N/A
0.72
0.02
17.57 N/A
N/A
4.8
0.02
15.86 N/A
N/A
4.16
0.02
11.38 N/A
N/A
2.26
0.02
10.68 N/A
N/A
2.42
0.02
0 N/A
N/A
0
0.02
5.06 N/A
N/A
0.93
0.02
19.02 N/A
N/A
4.61

71 -RI
434.02
439
0 N/A
0.02
0 N/A
N/A
0
73 -AD
437.73
440
20 N/A
0.02
8.17 N/A
N/A
4.94
74 -CB -EX
437.77
442.72
0 N/A
0.02
39.16 N/A
N/A
10.13
offsite -02
429.12
435
0 N/A
0.02
88.28 N/A
N/A
15.09
post_exst ib
436.89
445
0 N/A
0.02
26.91 N/A
N/A
8.44
post_west_offsite inlet
429.12
435
0 N/A
0.02
88.21 N/A
N/A
15.09
Pre -NE -Inlet
436.89
445
0 N/A
0.02
118.16 N/A
N/A
17.43
Pre -Soil -Park -Inlet
437.77
443
0 N/A
0.02
38.52 N/A
N/A
10.05

F" Iq
STEWART
Project:
Project No:
PIPE NETWORK
NC Agricultural Science Center
C16123
SUMMARY 25 YEAR EVENT
Date:
By:
9.20.2018
NBC
Revision:
-
Start Structure
End Structure
Length (ft) Inlet Invert
Outlet Invert
Slope (%)
Diameter (in)
Max Flow Depth (ft)
Flow Capacity (cfs)
Peak Flow (cfs)
02 -JB
01 -HW
112.42
423.18
422.03
1.02
24.00
1.04
22.88
15.69
11 -JB
10 -HW
124.12
410.40
407.70
2.18
30.00
2.13
60.50
51.20
12 -RI
11 -JB
105.98
413.50
410.60
2.74
30.00
2.50
67.85
51.20
21 -AD
BACKBIO
123.10
416.73
415.50
1.00
30.00
2.16
41.00
31.71
43 -CB
42 -CB
58.22
421.21
419.85
2.34
15.00
0.39
9.87
1.14
22 -AD
21 -AD
104.59
417.75
416.93
0.78
30.00
2.13
36.32
26.82
23 -AD
22 -AD
192.17
421.00
418.00
1.56
18.00
0.99
13.12
2.96
24 -AD
22 -AD
104.85
418.75
417.95
0.76
24.00
2.00
19.76
19.66
25 -AD
24 -AD
115.42
421.08
418.95
1.85
24.00
1.60
30.73
15.28
26 -CB
25 -AD
64.61
423.00
421.28
2.66
24.00
1.06
36.91
15.00
27 -JB
26 -CB
72.25
423.82
423.10
1.00
15.00
0.76
6.45
2.08
28 -AD
26 -CB
86.66
425.30
424.20
1.27
24.00
1.05
25.49
12.08
30 -CB
28 -AD
19.63
425.80
425.50
1.53
24.00
0.92
27.97
4.96
32 -CB
30 -CB
133.46
433.40
426.50
5.17
15.00
0.35
14.90
2.53
33 -CB
32 -CB
24.63
434.00
433.60
1.62
15.00
0.37
8.23
1.17
45-C132
41 -JB
81.58
417.13
416.30
1.02
30.00
1.74
41.37
18.93
46 -CB
45-C132
98.70
418.53
417.53
1.01
18.00
1.34
10.57
9.51
47 -CB
46 -CB
39.59
419.33
418.93
1.01
15.00
1.20
6.49
8.82
50 -AD
45-C132
179.23
423.50
418.00
3.07
15.00
0.70
11.32
5.51
45 -CB
50 -AD
35.78
424.67
423.60
2.99
15.00
0.55
11.17
3.24
52 -CB
45 -CB
23.99
425.01
424.77
1.00
15.00
0.59
6.46
2.41
03 -AD
02 -JB
43.58
423.71
423.28
0.99
15.00
1.18
6.42
1.89
63 -JB
62 -CB
58.28
441.56
441.21
0.60
15.00
0.83
5.01
2.17
62 -CB
61 -AD
63.86
441.11
440.73
0.60
15.00
1.13
4.98
2.98
61 -AD
FRONTBIO
104.67
440.63
440.00
0.60
18.00
1.17
8.15
7.49
31 -CB
30 -CB
23.97
426.50
426.20
1.25
18.00
0.51
11.75
2.12
35 -JB
34 -HW
14.00
440.16
440.02
1.00
15.00
1.13
5.60
6.55
36 -AD
35 -JB
69.47
441.05
440.36
0.99
15.00
1.09
5.58
3.17
37 -CB
36 -AD
21.70
441.50
441.25
1.15
15.00
0.75
6.01
2.77
38 -CB
37 -CB
131.55
443.01
441.70
1.00
15.00
0.57
5.59
2.11
48 -CB
47 -CB
77.18
423.87
420.70
4.11
15.00
0.70
13.09
4.16

STEWART
Project:
Project No:
Start Structure
44 -CB
71 -RI
72 -JB
70 -RI
41 -JB
42 -CB
Pre -Soil -Park -Inlet
post_exst_jb
offsite -02
73 -AD
74 -CB -EX
post_west_offsite inlet
Pre -NE -Inlet
Pre_southJB
NC Agricultural Science Center
C16123
End Structure
41 -JB
70 -RI
71 -RI
Post -South Outfa
BACKBIO
41 -JB
Pre_southJB
Post -ext -NE -FES
offsite 01
72 -JB
72 -JB
02 -JB
Pre_NE_hW
Pre -south -outfall
Date: 9.20.2018
By: NBC
Length (ft)
Inlet Invert
Outlet Invert
Slope (%)
64.71
421.00
420.00
1.55
63.18
434.02
433.39
1.00
89.00
436.70
435.22
1.66
107.19
433.29
429.62
3.42
31.73
416.30
416.00
0.95
92.99
419.85
418.71
1.23
159.00
437.77
436.90
0.55
108.79
0.00
0.00
0.00
166.00
0.00
0.00
0.00
52.74
437.73
437.20
1.00
59.20
437.77
437.52
0.42
146.00
429.12
423.18
4.07
107.00
436.89
435.98
0.85
110.00
433.29
429.62
3.34
Revision: -
Diameter (in)
Max Flow Depth (ft)
Flow Capacity (cfs)
Peak Flow (cfs)
15.00
0.42
6.96
1.54
18.00
1.44
10.49
14.75
18.00
1.50
11.74
13.67
24.00
1.05
41.86
19.05
30.00
1.74
39.88
22.46
18.00
0.50
10.08
2.37
15.00
1.20
4.14
9.12
18.00
0.94
8.33
8.45
24.00
0.82
45.60
15.08
18.00
1.50
9.13
4.44
15.00
1.25
3.64
9.90
24.00
1.25
39.55
15.09
15.00
0.81
5.16
10.70
24.00
1.19
35.81
20.59

L
STEWART
Project:
NC Agricultural Science Center
Date: 9.20.2018
Project No:
C16123
By: NBC
SCM SUMMARY
25 YEAR
0
SCM Name
Initial Water
Peak Inflow Peak Outflow
Maximum Stage Maximum Depth
Elevvation
(Cf S) (cfs)
BACKBIO
415.5
60.84
51.2
417.61
2.11
FRONTBIO
439
17.11
2.84
441.04
2.04
MEDIANI
442
4.82
4.57
442.64
0.64
MEDIAN2
421
7.73
7.38
421.74
0.74
MEDIAN3
420
5.1
4.82
420.71
0.71
MEDIAN4
420
5.07
4.99
420.65
0.65
MEDIANS
423
2.02
1.94
423.5
0.5
Revision: -

i
STEWART
RIPRAP OUTLET PROTECTION WORKSHEET
Project NC Agricultural Science Center Date 2018.09.20
Project No. C16123 Designer NBC
Outlet ID HW -01
Outlet flowrate
12.44
cfs
Pipe diameter
24
inches
Outlet pipe slope
1.02
percent
Full flow velocity
9.0
ft/sec
Material =
EQUIVALENT PIPE AREA
Figure 8.06.b.1
25
20
u
15
w
umone
c 10
d
5 Zan I
Zone0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above = 2
Outlet pipe diameter
24 in.
Length =
12.0 ft.
Outlet flowrate
12.4 cfs
Width =
6.0 ft.
Outlet velocity
9.0 ft/sec
Stone diameter =
6 in.
Material =
Class B
Thickness =
22 in.
Zone
Material
Diameter Thickness
Length
Width
1
Class A
3
9
4 x D(o)
3 x D(o)
2
Class B
6
22
6 x D(o)
3 x D(o)
3
Class I
13
22
8 x D(o)
3 x D(o)
4
Class I
13
22
8 x D(o)
3 x D(o)
5
Class II
23
27
10 x D(o)
3 x D(o)
6
Class II
23
27
10 x D(o)
3 x D(o)
7
Special study required
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

i
STEWART
RIPRAP OUTLET PROTECTION WORKSHEET
Project NC Agricultural Science Center Date 2018.09.20
Project No. C16123 Designer NBC
Outlet ID HW -10
Outlet flowrate
47.22
cfs
Pipe diameter
30
inches
Outlet pipe slope
1.13
percent
Full flow velocity
11.2
ft/sec
Material =
EQUIVALENT PIPE AREA
Figure 8.06.b.1
25
20
u
15
w
u e
� 10
d
5 Zan, I
Zone 70
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above = 3
Outlet pipe diameter
30 in.
Length =
20.0 ft.
Outlet flowrate
47.2 cfs
Width =
7.5 ft.
Outlet velocity
11.2 ft/sec
Stone diameter =
13 in.
Material =
Class I
Thickness =
22 in.
Zone
Material
Diameter Thickness
Length
Width
1
Class A
3
9
4 x D(o)
3 x D(o)
2
Class B
6
22
6 x D(o)
3 x D(o)
3
Class I
13
22
8 x D(o)
3 x D(o)
4
Class I
13
22
8 x D(o)
3 x D(o)
5
Class II
23
27
10 x D(o)
3 x D(o)
6
Class II
23
27
10 x D(o)
3 x D(o)
7
Special study required
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

i
STEWART
RIPRAP OUTLET PROTECTION WORKSHEET
Project NC Agricultural Science Center Date 2018.09.20
Project No. C16123 Designer NBC
Outlet ID HW -20
Outlet flowrate
28.93
cfs
Pipe diameter
30
inches
Outlet pipe slope
1
percent
Full flow velocity
7.0
ft/sec
Material =
EQUIVALENT PIPE AREA
Figure 8.06.b.1
25
20
u
15
w
umone
c 10
d
5
— Zone0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above = 2
Outlet pipe diameter
30 in.
Length =
15.0 ft.
Outlet flowrate
28.9 cfs
Width =
7.5 ft.
Outlet velocity
7.0 ft/sec
Stone diameter =
6 in.
Material =
Class B
Thickness =
22 in.
Zone
Material
Diameter Thickness
Length
Width
1
Class A
3
9
4 x D(o)
3 x D(o)
2
Class B
6
22
6 x D(o)
3 x D(o)
3
Class I
13
22
8 x D(o)
3 x D(o)
4
Class I
13
22
8 x D(o)
3 x D(o)
5
Class II
23
27
10 x D(o)
3 x D(o)
6
Class II
23
27
10 x D(o)
3 x D(o)
7
Special study required
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

i
STEWART
RIPRAP OUTLET PROTECTION WORKSHEET
Project NC Agricultural Science Center Date 2018.09.20
Project No. C16123 Designer NBC
Outlet ID HW -40
Outlet flowrate
19.16
cfs
Pipe diameter
30
inches
Outlet pipe slope
0.95
percent
Full flow velocity
6.3
ft/sec
Material =
EQUIVALENT PIPE AREA
Figure 8.06.b.1
25
20
u
15
w
umone
d
10
5
0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above = 2
Outlet pipe diameter
30 in.
Length =
15.0 ft.
Outlet flowrate
19.2 cfs
Width =
7.5 ft.
Outlet velocity
6.3 ft/sec
Stone diameter =
6 in.
Material =
Class B
Thickness =
22 in.
Zone
Material
Diameter Thickness
Length
Width
1
Class A
3
9
4 x D(o)
3 x D(o)
2
Class B
6
22
6 x D(o)
3 x D(o)
3
Class I
13
22
8 x D(o)
3 x D(o)
4
Class I
13
22
8 x D(o)
3 x D(o)
5
Class II
23
27
10 x D(o)
3 x D(o)
6
Class II
23
27
10 x D(o)
3 x D(o)
7
Special study required
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

i
STEWART
RIPRAP OUTLET PROTECTION WORKSHEET
Project NC Agricultural Science Center Date 2018.09.20
Project No. C16123 Designer NBC
Outlet ID HW -60
Outlet flowrate
6.34
cfs
Pipe diameter
18
inches
Outlet pipe slope
0.6
percent
Full flow velocity
4.7
ft/sec
Material =
EQUIVALENT PIPE AREA
Figure 8.06.b.1
25
20
u
15
w
umone
d
10
5
0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above = 1
Outlet pipe diameter
18 in.
Length =
6.0 ft.
Outlet flowrate
6.3 cfs
Width =
4.5 ft.
Outlet velocity
4.7 ft/sec
Stone diameter =
3 in.
Material =
Class A
Thickness =
9 in.
Zone
Material
Diameter Thickness
Length
Width
1
Class A
3
9
4 x D(o)
3 x D(o)
2
Class B
6
22
6 x D(o)
3 x D(o)
3
Class I
13
22
8 x D(o)
3 x D(o)
4
Class I
13
22
8 x D(o)
3 x D(o)
5
Class II
23
27
10 x D(o)
3 x D(o)
6
Class II
23
27
10 x D(o)
3 x D(o)
7
Special study required
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

i
STEWART
RIPRAP OUTLET PROTECTION WORKSHEET
Project NC Agricultural Science Center Date 2018.09.20
Project No. C16123 Designer NBC
Outlet ID HW -34
Outlet flowrate
5.53
cfs
Pipe diameter
15
inches
Outlet pipe slope
1
percent
Full flow velocity
4.8
ft/sec
Material =
EQUIVALENT PIPE AREA
Figure 8.06.b.1
25
20
u
15
w
umone
d
10
5
0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above = 2
Outlet pipe diameter
15 in.
Length =
7.5 ft.
Outlet flowrate
5.5 cfs
Width =
3.8 ft.
Outlet velocity
4.8 ft/sec
Stone diameter =
6 in.
Material =
Class B
Thickness =
22 in.
Zone
Material
Diameter Thickness
Length
Width
1
Class A
3
9
4 x D(o)
3 x D(o)
2
Class B
6
22
6 x D(o)
3 x D(o)
3
Class I
13
22
8 x D(o)
3 x D(o)
4
Class I
13
22
8 x D(o)
3 x D(o)
5
Class II
23
27
10 x D(o)
3 x D(o)
6
Class II
23
27
10 x D(o)
3 x D(o)
7
Special study required
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

i
STEWART
RIPRAP OUTLET PROTECTION WORKSHEET
Project NC Agricultural Science Center Date 2018.09.20
Project No. C16123 Designer NBC
Outlet ID
Existing South Outlet
Length =
Outlet flowrate
16.24
cfs
Pipe diameter
24
inches EQUIVALENT PIPE AREA
Outlet pipe slope
3.42
percent
Full flow velocity
11.0
ft/sec
22 in.
Figure 8.06.b.1
25
20
u
15
w
u41 mone
d
10
5 Zan, I
0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above = 2
Outlet pipe diameter
24 in.
Length =
12.0 ft.
Outlet flowrate
16.2 cfs
Width =
6.0 ft.
Outlet velocity
11.0 ft/sec
Stone diameter =
6 in.
Material =
Class B
Thickness =
22 in.
Zone
Material
Diameter Thickness
Length
Width
1
Class A
3
9
4 x D(o)
3 x D(o)
2
Class B
6
22
6 x D(o)
3 x D(o)
3
Class I
13
22
8 x D(o)
3 x D(o)
4
Class I
13
22
8 x D(o)
3 x D(o)
5
Class II
23
27
10 x D(o)
3 x D(o)
6
Class II
23
27
10 x D(o)
3 x D(o)
7
Special study required
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

Aw
P-: -- ;h6j
STEWART
Site Data Analysis - Nitrogen Calculations
(Based upon total Parcel Area + ROW)
Existing Conditions
Protected Open 25.16 ac
Managed Open 14.70 ac
Impervious 0.26 ac
Total Project Area 40.12 ac
Proposed Conditions
Protected Open 25.16 ac
Managed Open 7.62 ac
Impervious 7.34 ac
Total Project Area 40.12 ac

STEWART
Total Nitrogen Export
(Using Apportioning Method)
Project: North Carolina Agricultural Sciences Center
Number: C16123
Date: 12 -Sep -18
Total Parcel Area =
Existing Imperious Area =
Existing Open Space =
Additional Proposed Impervious Area =
Total Proposed Impervious Area =
Remaining Open Space =
40.12 ac
0.26 ac
39.86 ac
7.079 ac
7.34 ac
32.78 ac
"area" of new development = 38.7078 ac (Add. Prop imp + apprortioned open space)
Apportioned open space = 31.6287 ac (ex. imp/prop. Imp*remaining open space)
Proposed Nitrogen Load = 188.031 Ib/yr [(Add. prop imp*21.2)+(app. open space*1.2)]
"area" of new development
Total Proposed Nitrogen Export = 4.86 Ib/ac/yr (Prop. Nitrogen Load/"area" of new develop.)
for "area" of new development
Total Prop. Nitrogen Export for "area" of new development with Treatment
Removal by BMP
Drainage area to BMP 11.420 ac
Effective removal rate 35%
Proposed Nitroaen Exuort with Treatment
Total Area = 32.954
123.652
Proposed Nitrogen Load = 188.031 Ib/yr
Total Nitrogen removed by BMP = 56.138 Ib/yr
Prop. Nitrogen Load with treatment = 131.894 Ib/yr
Total Proposed Nitrogen Export = 3.41 Ib/ac/yr
for "area" of new development
with treatment
Buydown Payment Calculation
Nitrogen Limit = 3.6 lbs/ac/yr
Total Parcel Area = 38.71 ac
Total Nitrogen Export = 3.41 lbs/ac/yr
Payment = $850.50 ac/lbs
Payment = $0.00
Min. Nitrogen to be removed from site = 48.68 Ib/yr
to meet 3.6 Ib/ac/yr for new "area"
Minimum area of imp. to sand filter = 6.561 ac
Min. Nitrogen to be removed from site = -199.05 Ib/yr
to meet 10 Ib/ac/yr for new "area"
Minimum area of imp. to sand filter = -26.826 ac
(Tot. Prop. Export- 3.6)*"area" of new develop.)
(TN to be removed/0.35/21.2)
(Tot. Prop. Export-3.6)*"area" of new develop.)
(TN to be removed/0.35/21.2)
Total
TN Export
Treatment
TN Export
Area
Amount
Reduced
(ac)
(lbs/yr)
lbs/yr
(lbs/yr)
To BMP
11.420
160.393
56.138
104.256
Remaining Site
21.534
19.397
0.000
19.397
Total Area = 32.954
123.652
Proposed Nitrogen Load = 188.031 Ib/yr
Total Nitrogen removed by BMP = 56.138 Ib/yr
Prop. Nitrogen Load with treatment = 131.894 Ib/yr
Total Proposed Nitrogen Export = 3.41 Ib/ac/yr
for "area" of new development
with treatment
Buydown Payment Calculation
Nitrogen Limit = 3.6 lbs/ac/yr
Total Parcel Area = 38.71 ac
Total Nitrogen Export = 3.41 lbs/ac/yr
Payment = $850.50 ac/lbs
Payment = $0.00
Min. Nitrogen to be removed from site = 48.68 Ib/yr
to meet 3.6 Ib/ac/yr for new "area"
Minimum area of imp. to sand filter = 6.561 ac
Min. Nitrogen to be removed from site = -199.05 Ib/yr
to meet 10 Ib/ac/yr for new "area"
Minimum area of imp. to sand filter = -26.826 ac
(Tot. Prop. Export- 3.6)*"area" of new develop.)
(TN to be removed/0.35/21.2)
(Tot. Prop. Export-3.6)*"area" of new develop.)
(TN to be removed/0.35/21.2)

STEWART
Existing Nitrogen Runoff Calculations
Total Parcel
Step 1: Determine area for each type of land use and enter in Column (2).
Step 2: Total the areas for each type of land use and enter at the bottom of Column (2).
Step 3: Multiply the areas in Column (2) by the TN export Coefficients in Column (3) and enter
in Column (4).
Step 4: Total the TN exports for each type of land use and enter at the bottom of Column (4).
Step 5: Determine the export coefficient for site by dividing the total TN export from uses at the
bottom of Column (4) by the area at the bottom of Column (2).
(1)
(2)
(3)
(4)
Type of Land Cover
Areas
TN export coefficient
TN export from use
(acres)
(lbs/ac/yr)
(lbs/yr)
Permanently protected
25.164
0.60
15.099
undisturbed open space
(forest, unmown meadow)
Permanently protected
14.697
1.2
17.637
open space
(grass, landscaping, etc.)
Impervious surfaces
0.258
21.2
5.475
(roads, parking lots,
driveways, roofs, paved
storage areas, etc.)
TOTAL
40.120
---
38.211
Total Nitrogen Export = 0.95 Ib/ac/yr

STEWART
Proposed Nitrogen Runoff Calculations
Total Parcel - BEFORE TREATMENT
Step 1: Determine area for each type of land use and enter in Column (2).
Step 2: Total the areas for each type of land use and enter at the bottom of Column (2).
Step 3: Multiply the areas in Column (2) by the TN export Coefficients in Column (3) and enter
in Column (4).
Step 4: Total the TN exports for each type of land use and enter at the bottom of Column (4).
Step 5: Determine the export coefficient for site by dividing the total TN export from uses at the
bottom of Column (4) by the area at the bottom of Column (2).
(1)
(2)
(3)
(4)
Type of Land Cover
Areas
TN export coefficient
TN export from use
(acres)
(lbs/ac/yr)
(lbs/yr)
Permanently protected
25.164
0.60
15.099
undisturbed open space
(forest, unmown meadow)
Permanently protected
7.616
1.2
9.139
open space
(grass, landscaping, etc.)
Impervious surfaces
7.337
21.2
155.552
(roads, parking lots,
driveways, roofs, paved
storage areas, etc.)
TOTAL
40.118
---
179.790
Total Nitrogen Export = 4.48 Ib/ac/yr

STEWART
Proposed Nitrogen Runoff Calculations
To BMP
Step 1: Determine area for each type of land use and enter in Column (2).
Step 2: Total the areas for each type of land use and enter at the bottom of Column (2).
Step 3: Multiply the areas in Column (2) by the TN export Coefficients in Column (3) and enter
in Column (4).
Step 4: Total the TN exports for each type of land use and enter at the bottom of Column (4).
Step 5: Determine the export coefficient for site by dividing the total TN export from uses at the
bottom of Column (4) by the area at the bottom of Column (2).
(1)
(2)
(3)
(4)
Type of Land Cover
Areas
TN export coefficient
TN export from use
(acres)
(lbs/ac/yr)
(lbs/yr)
Permanently protected
7.163
0.60
4.298
undisturbed open space
(forest, unmown meadow)
Permanently protected
4.300
1.2
5.161
open space
(grass, landscaping, etc.)
Impervious surfaces
7.120
21.2
150.935
(roads, parking lots,
driveways, roofs, paved
storage areas, etc.)
TOTAL
11.420
---
160.393
Total Nitrogen Export = 14.04 Ib/ac/yr

STEWART
Proposed Nitrogen Runoff Calculations
Remaining portion of parcel with NO TREATMENT
Step 1: Determine area for each type of land use and enter in Column (2).
Step 2: Total the areas for each type of land use and enter at the bottom of Column (2).
Step 3: Multiply the areas in Column (2) by the TN export Coefficients in Column (3) and enter
in Column (4).
Step 4: Total the TN exports for each type of land use and enter at the bottom of Column (4).
Step 5: Determine the export coefficient for site by dividing the total TN export from uses at the
bottom of Column (4) by the area at the bottom of Column (2).
(1)
(2)
(3)
(4)
Type of Land Cover
Areas
TN export coefficient
TN export from use
(acres)
(lbs/ac/yr)
(lbs/yr)
Permanently protected
18.001
0.60
10.801
undisturbed open space
(forest, unmown meadow)
Permanently protected
3.316
1.2
3.979
open space
(grass, landscaping, etc.)
Impervious surfaces
0.218
21.2
4.617
(roads, parking lots,
driveways, roofs, paved
storage areas, etc.)
TOTAL
21.534
---
19.397
Total Nitrogen Export = 0.90 Ib/ac/yr

Appendix 4
Stormwater Drawings
a. SW1.0- Pre -Development Land Use
b. SW2.0- Post -Development Land Use
c. SW3.0- Pre -Development Drainage Area
d. SW4.0- Post -Development Drainage
Area

0 5
SCALE
200
1"=100'
NORTH
3.12'
3.12'
2.72'
TOC -408.90'
OUT=404.70'
TOC=434.52'
OUT=429.
OUT=429.12'
c
TOC=397.93' /
k,S—IN(15")= RAT
RQ'A IN(24")=392'P� ` �RIM�391.78'OUT=392.63'/ 6'
TOC=398.47'�'\
OUT=394.17'
398.48' \ \
94.
TOC=399.70'
IN(15")=394.10'
IN(18")=394.2(9'
TOC=400.42'
OUT=395.82'
b
I I I / O/TREE
A_
� NI =391384.93'
'
\ .93
\ ` ` T=383.07'
WOODED
AREA
NICE !✓ 1 1 1 \ ` �i \ \ \
WOODED
AREA
06QA
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pYv \ yo° ZONE 1 AND ZONE 2
BUFFER BASED ON
V 8QA goo 1 ESTIMATED NORTHEAST
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=ENCE \\
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COMPLETED ON \
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WOODED 1
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FENCc\ \ 1`
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a 1 \\\ \ \\ \
FENCE
420
/-4 ' i,N
FEN�.E a RIP FEEDER
RAP
PAD
WOODED \
SFENCE AREA
-425' --- A \ \\\ \
CONTROL PGINT \ \ A \ \ \ \
*,F 1$�� A \ �FF IV:751803.84'
/�:20 5432.411' \ V A \
EL 28.28' 4' Ifs\ \\ \ _
FEEDER x \ \
\ F- STATE OF NORTH CAROLINA
\, \,(� PIN 0785-31-6741 \ / � � � \ \ ` V�' ED \ ' `SPIGOT DEEDED ACREAGE \ 1,074.81 BM 1985-01399 �� \ I / � —� WOO
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FENCE —� _— 435
2 �\`��FENCPE
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16QR.
2QR
FENCE 4' WIRE QR \\\ \
FENCE -\/ \ \ \
\ / 2QR _ �� / EXISTING \ \
��� 445— TOC=444.89' AGRICULTURE DEPARTMENT
41.29' AGRONOMICS BUILDING \\�
\ \ \\ 1N(1T X437. Oa / RIM=444.83'
�4QR\ \ OUT=436.80 IN(4")=439.43'
G IN(8")=440.15'
2A A OUT=437.7393
PROJECT BOUNDARY
40.03 ACRES
PROJECT AREA = 40.03 AC
EXISTING IMPERVIOUS
WITHIN PROJECT AREA=
11,250 SF (0.258 AC)
EXISTING PROJECT AREA =
0.645% IMPERVIOUS
SURVEY LEGEND:
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SURVEY CONTROL POINT
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TRAFFIC SIGNAL BOX
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TRAFFIC SIGNAL POST
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FINISHED FLOOR ELEVATION
DECIDUOUS TREE
EVERGREEN TREE
BUSH
X
WIRE FENCE
— O —
CHAIN LINK FENCE
T
UNDERGROUND TELEPHONE LINE
FO
UNDERGROUND FIBER OPTIC LINE
G
UNDERGROUND GAS LINE
E
UNDERGROUND ELECTRIC LINE
W—
UNDERGROUND WATER LINE
SS—
SANITARY SEWER LINE
- -
STORM DRAIN LINE
—OHW—
OVERHEAD WIRES
U
UNIDENTIFIED LINE
UNKNOWN DESTINATION
CONCRETE SURFACE
ABBREVIATIONS:
SURVEY TREE LEGEND:
DIP
DUCTILE IRON PIPE
Io
AMERICAN HOLLY
.1v
EASTERN RED CEDAR
PVC
POLYVINYL CHLORIDE PIPE
LI
CREPE MYRTLE
HDPE
HIGH-DENSITY POLYETHYLENE PIPE
MG
SOUTHERN MAGNOLIA
RCP
REINFORCED CONCRETE PIPE
Po
EASTERN SYCAMORE
CMP
CORRUGATED METAL PIPE
PT
LOBLOLLY PINE
CB
CATCH BASIN
QR
RED OAK
EXAMPLE: 10QR = 10" RED OAK
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STEWART
223 S. WEST ST, SUITE 1100 FIRM LICENSE #: C-1051
RALEIGH, NC 27603 www.stewartinc.com
T 919.380.8750 PROJECT #: 16123
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223 S. WEST ST, SUITE 1100 FIRM LICENSE #: C-1051
RALEIGH, NC 27603 www.stewartinc.com
T 919.380.8750 PROJECT #: 16123
FOR REVIEW ONLY
NO. REVISION DATE
JOB NUMBER
C16123
DATE ISSUED
09.21.2018
PROJECT STATUS
NCDEQ STORMWATER REVIEW
SHEET
EXISTING
LAND USE
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FOR REVIEW ONLY
NO. REVISION DATE
JOB NUMBER
C16123
DATE ISSUED
09.21.2018
PROJECT STATUS
NCDEQ STORMWATER REVIEW
SHEET
EXISTING
LAND USE

0 50 100 200
SCALE: 1"=100'
NORTH
TOC=397.93'
SRCA IN(24")=392. Ri 3aiaee'
OUT=392.6.',v� ou - .4s'
TOC=398.47'
V IN=394.37' \\\� Xs \
OUT=394.17'
d v' '-398.48' \
\9�
TOC=399.70' \ �\� RIM=391.93'
I N (15")=394.10' 384.93'
\ T=383.07'
)=394.2
OUT=
a-
OUT393.9
TOC=400.42' N \
OUT --395.82'\ r � .�� \ \
\� WOODED �EA
\0.
\\ \ \\ WOODED
AREA
�/—
O R AI WOODED
\ I AREA
I , L / I I TRE
TREEQA
\ \ \ \
ZONE 1 AND ZONE 2 \
�0 BUFFER BASED ON \
A \ 0 \ ESTIMATED NORTHEAST
\ TOP OF BANK \
M6uFF� R
l\ \ l
WOODED \ 1 Sig P M BoFF
\\\ 32010 7011-
SOUTHWEST
01
SOUTHWEST TOP OF
BANK PROVIDED BY
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PROPOSED IMPERVIOUS
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3197615 SF (7.34 AC)
PROPOSED PROJECT AREA
= 18.29% IMPERVIOUS
SURVEY LEGEND:
0
SURVEY CONTROL POINT
O EIP
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❑ ECM
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♦
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®
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Lu
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TRAFFIC SIGNAL POST
BOR
BORING LOCATION
•
BOLLARD
v
SIGN
FF=267.18'
I—
FINISHED FLOOR ELEVATION
DECIDUOUS TREE
LL
EVERGREEN TREE
BUSH
X
WIRE FENCE
— O —
CHAIN LINK FENCE
T
UNDERGROUND TELEPHONE LINE
FO
UNDERGROUND FIBER OPTIC LINE
G
UNDERGROUND GAS LINE
E
UNDERGROUND ELECTRIC LINE
W—
UNDERGROUND WATER LINE
SS—
SANITARY SEWER LINE
- -
STORM DRAIN LINE
—OHW—
OVERHEAD WIRES
U
UNIDENTIFIED LINE
UNKNOWN DESTINATION
QO
CONCRETE SURFACE
ABBREVIATIONS: SURVEY TREE LEGEND
DIP
DUCTILE IRON PIPE
PVC
POLYVINYL CHLORIDE PIPE
HDPE
HIGH-DENSITY POLYETHYLENE PIPE
RCP
REINFORCED CONCRETE PIPE
CMP
CORRUGATED METAL PIPE
CB
CATCH BASIN
Io
AMERICAN HOLLY
.1v
EASTERN RED CEDAR
LI
CREPE MYRTLE
MG
SOUTHERN MAGNOLIA
Po
EASTERN SYCAMORE
PT
LOBLOLLY PINE
QR
RED OAK
EXAMPLE: 10QR = 10" RED OAK
2
�2
ria
o O
n V
N =
U �
Z Q
2 =
L =
W W
J V
LL
LL
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223 S. WEST ST, SUITE 1100
FIRM LICENSE #: C-1051
RALEIGH, NC 27603
www.stewartinc.com
T 919.380.8750
PROJECT #: 16123
FOR REVIEW ONLY
NO. REVISION DATE
JOB NUMBER
C16123
DATE ISSUED
09.21.2018
PROJECT STATUS
NCDEQ STORMWATER REVIEW
SHEET
PROPOSED
LAND USE
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NO. REVISION DATE
JOB NUMBER
C16123
DATE ISSUED
09.21.2018
PROJECT STATUS
NCDEQ STORMWATER REVIEW
SHEET
PROPOSED
LAND USE
SW2,0

OFF-SITE DRAINAGE
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\AREA\
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NO TH ANALYSIS POINT\
TREE
\
36� \
5PY I / -� _ \ O�
ZONE 1 AND ZONE 2
5P
\\ �° BUFFER BASED ON
I F 4 4�A < god° \ l ESTIMATED NORTHEAST
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OUT=441.31' �o \ o� • a° ' S,Q - TIME OF CONCENTRATION 1 QR 2QR \\ \\ \ \\ \\
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SOUTH ANALYSIS POINT \ \ / \ A " 14eR
0 30 60 120 NORTH
SCALE: 1 "=60'
NORTH DRAINAGE AREA
12.315 AC
EAST DRAINAGE AREA
4.130 AC
SOUTH DRAINAGE AREA
3.786 AC
IMPERVIOUS AREA
SURVEY LEGEND:
0 SURVEY CONTROL POINT
O EIP EXISTING IRON PIPE
❑ ECM EXISTING CONCRETE MONUMENT
A COMPUTED POINT
Q STORM DRAIN MANHOLE
of STORM DRAIN CURB INLET
(3) SANITARY SEWER MANHOLE
HYDRANT
NV
WATER VALVE
O M WATER METER
QW WATER MANHOLE
D WATER VAULT
GV
N GAS VALVE
GM
a GAS METER
QT TELEPHONE MANHOLE
TPEDEl TELEPHONE PEDESTAL
© TV MANHOLE
CATV
El TV PEDESTAL
FOWP
0 FIBER OPTIC WITNESS POST
® FIBER OPTIC BOX
QE ELECTRIC MANHOLE
EM
a ELECTRIC METER
EB ELECTRIC BOX
UTILITY POLE
-0 GUY POLE
GUY WIRE
>Yt LIGHT POLE
© MANHOLE
TS TRAFFIC SIGNAL BOX
>� TRAFFIC SIGNAL POST
OR BORING LOCATION
• BOLLARD
v SIGN
FF=267.18' FINISHED FLOOR ELEVATION
DECIDUOUS TREE
EVERGREEN TREE
0 BUSH
X WIRE FENCE
O CHAIN LINK FENCE
T UNDERGROUND TELEPHONE LINE
FO UNDERGROUND FIBER OPTIC LINE
G UNDERGROUND GAS LINE
E UNDERGROUND ELECTRIC LINE
W UNDERGROUND WATER LINE
SS SANITARY SEWER LINE
STORM DRAIN LINE
-OHW- OVERHEAD WIRES
U UNIDENTIFIED LINE
UNKNOWN DESTINATION
CONCRETE SURFACE
ABBREVIATIONS:
DIP DUCTILE IRON PIPE
PVC POLYVINYL CHLORIDE PIPE
HDPE HIGH-DENSITY POLYETHYLENE PIPE
RCP REINFORCED CONCRETE PIPE
CMP CORRUGATED METAL PIPE
CB CATCH BASIN
SURVEY TREE LEGEND:
10
AMERICAN HOLLY
Peak Flow Summary Table (cf/ sec)
EASTERN RED CEDAR
LI
CREPE MYRTLE
MG
PRE
POST
EASTERN SYCAMORE
STORM EVENT
DRAINAGE AREA
w/o detention
w/ detention
% DIFF
NORTH
0.01
4.65
0.01
0%
1" - WQ
EAST
0.00
0.00
-
°°
a
SOUTH
0.50
1.08
0.54
8%
DATE ISSUED
NORTH
12.51
35.46
32.58
160%
2 -YR
EAST
5.50
3.00-
DU
-45%
DRAINAGE AREA
SOUTH
8.06
15.27
8.10
0%
o
NORTH
23.79
50.95
49.34
107%
5 -YR
EAST
9.69
4.87-
-50%
W
SOUTH
12.85
21.31
12.19
-5%
NORTH
34.17
64.88
62.69
83%
10 -YR
EAST
10.70
6.50-
U
-39%
SOUTH
17.03
22.52
15.34
-10%
Q
NORTH
45.27
75.22
70.98
57%
25 -YR
EAST
10.70
8.14-
-24%
z
SOUTH
20.49
23.73
18.99
-7%
NORTH DRAINAGE AREA
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4.130 AC
SOUTH DRAINAGE AREA
3.786 AC
IMPERVIOUS AREA
SURVEY LEGEND:
0 SURVEY CONTROL POINT
O EIP EXISTING IRON PIPE
❑ ECM EXISTING CONCRETE MONUMENT
A COMPUTED POINT
Q STORM DRAIN MANHOLE
of STORM DRAIN CURB INLET
(3) SANITARY SEWER MANHOLE
HYDRANT
NV
WATER VALVE
O M WATER METER
QW WATER MANHOLE
D WATER VAULT
GV
N GAS VALVE
GM
a GAS METER
QT TELEPHONE MANHOLE
TPEDEl TELEPHONE PEDESTAL
© TV MANHOLE
CATV
El TV PEDESTAL
FOWP
0 FIBER OPTIC WITNESS POST
® FIBER OPTIC BOX
QE ELECTRIC MANHOLE
EM
a ELECTRIC METER
EB ELECTRIC BOX
UTILITY POLE
-0 GUY POLE
GUY WIRE
>Yt LIGHT POLE
© MANHOLE
TS TRAFFIC SIGNAL BOX
>� TRAFFIC SIGNAL POST
OR BORING LOCATION
• BOLLARD
v SIGN
FF=267.18' FINISHED FLOOR ELEVATION
DECIDUOUS TREE
EVERGREEN TREE
0 BUSH
X WIRE FENCE
O CHAIN LINK FENCE
T UNDERGROUND TELEPHONE LINE
FO UNDERGROUND FIBER OPTIC LINE
G UNDERGROUND GAS LINE
E UNDERGROUND ELECTRIC LINE
W UNDERGROUND WATER LINE
SS SANITARY SEWER LINE
STORM DRAIN LINE
-OHW- OVERHEAD WIRES
U UNIDENTIFIED LINE
UNKNOWN DESTINATION
CONCRETE SURFACE
ABBREVIATIONS:
DIP DUCTILE IRON PIPE
PVC POLYVINYL CHLORIDE PIPE
HDPE HIGH-DENSITY POLYETHYLENE PIPE
RCP REINFORCED CONCRETE PIPE
CMP CORRUGATED METAL PIPE
CB CATCH BASIN
SURVEY TREE LEGEND:
10
AMERICAN HOLLY
iv
EASTERN RED CEDAR
LI
CREPE MYRTLE
MG
SOUTHERN MAGNOLIA
PO
EASTERN SYCAMORE
PT
LOBLOLLY PINE
OR
RED OAK
EXAMPLE: 10QR = 10" RED OAK
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223 S. WEST ST, SUITE 1100
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PROJECT STATUS
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SHEET
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DRAINAGE AREA

OFF-SITE DRAINAGE
TOC=446.46'
OUT=441.31'
o
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EXISTING VEGETATED CONVEYANCE
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IMPERVIOUS AREA
SURVEY LEGEND:
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Peak Flow Summary Table (cf/ sec)
0 EIP
EXISTING IRON PIPE
❑ ECM
EXISTING CONCRETE MONUMENT
PRE
POST
QD
STORM DRAIN MANHOLE
STORM EVENT
DRAINAGE AREA
w/o detention w/ detention
% DIFF
NORTH
0.01
4.65
0.01
0%
1" - WQ
EAST
0.00
0.00 -
®
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SOUTH
0.50
1.08
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35.46
32.58
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EAST
5.50
3.00-
CATV
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SOUTH
8.06
15.27
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12.19
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rs
NORTH
34.17
64.88
62.69
83%
10 -YR
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10.70
6.50-
FF=267.18'
-39%
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SOUTH
17.03
22.52
15.34
-10%
NORTH
45.27
75.22
70.98
57%
25 -YR
EAST
10.70
8.14-
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-24%
E
SOUTH
20.49
23.73
18.99
-7%
NORTH DRAINAGE AREA
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EAST DRAINAGE AREA
1.664 AC
101,
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SMENg
fowfowfowfowli 5.425 AC
IMPERVIOUS AREA
SURVEY LEGEND:
0
SURVEY CONTROL POINT
0 EIP
EXISTING IRON PIPE
❑ ECM
EXISTING CONCRETE MONUMENT
♦
COMPUTED POINT
QD
STORM DRAIN MANHOLE
®
STORM DRAIN CURB INLET
(s)
SANITARY SEWER MANHOLE
HYDRANT
Lu
m�
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M
O
WATER METER
®
WATER MANHOLE
D
WATER VAULT
GV
m
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GM
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TPED
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FIBER OPTIC WITNESS POST
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0
UTILITY POLE
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GUY POLE
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0
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Q
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rs
TRAFFIC SIGNAL BOX
l'p
TRAFFIC SIGNAL POST
OR
BORING LOCATION
•
BOLLARD
v
SIGN
FF=267.18'
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Q
FINISHED FLOOR ELEVATION
DECIDUOUS TREE
LL
EVERGREEN TREE
BUSH
X
WIRE FENCE
- O -
CHAIN LINK FENCE
T
UNDERGROUND TELEPHONE LINE
FO
UNDERGROUND FIBER OPTIC LINE
G
UNDERGROUND GAS LINE
E
UNDERGROUND ELECTRIC LINE
W-
UNDERGROUND WATER LINE
SS-
SANITARY SEWER LINE
- -
STORM DRAIN LINE
-OHW-
OVERHEAD WIRES
U
UNIDENTIFIED LINE
UNKNOWN DESTINATION
<
CONCRETE SURFACE
ABBREVIATIONS: SURVEY TREE LEGEND
DIP
DUCTILE IRON PIPE
PVC
POLYVINYL CHLORIDE PIPE
HDPE
HIGH-DENSITY POLYETHYLENE PIPE
RCP
REINFORCED CONCRETE PIPE
CMP
CORRUGATED METAL PIPE
CB
CATCH BASIN
io
AMERICAN HOLLY
.1v
EASTERN RED CEDAR
LI
CREPE MYRTLE
MG
SOUTHERN MAGNOLIA
Po
EASTERN SYCAMORE
PT
LOBLOLLY PINE
QR
RED OAK
EXAMPLE: 10QR = 10" RED OAK
2
�2
ria
0 0
n U
N =
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223 S. WEST ST, SUITE 1100 FIRM LICENSE #: C-1051
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T 919.380.8750 PROJECT #: 16123
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NO. REVISION DATE
JOB NUMBER
C16123
DATE ISSUED
09.21.2018
PROJECT STATUS
NCDEQ STORMWATER REVIEW
SHEET
PROPOSED
DRAINAGE AREA
SW4,0
w
U_
Lu
Lu
z
w
Lu
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DATE ISSUED
09.21.2018
PROJECT STATUS
NCDEQ STORMWATER REVIEW
SHEET
PROPOSED
DRAINAGE AREA
SW4,0

Appendix 5
Erosion Control Calculations
a. Diversion Ditch Calculations
b. Skimmer Sedimentation Basin Sizing
C. Slope Drain Sizing Calculations
D. Rip Rap Dissipater Sizing

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -01
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
2.03 (Ac.)
0.55
5.60 (in/hr)
6.26 (cfs)
DESIGN CRITERIA
1.4 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.045
(ft/ft)
R
0.37
M = 3
:1 (sideslope)
s
0.045 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
2.71 (ft/s)
Z REQUID= 1.19
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 6.06 (ft)
BW 3.00 (ft)
h 0.51 (ft)
Conservation of Mass Check
Q=VA r6.26 (cfs) 2.31 = 2.31 Ox
6.26 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
1.4 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 2.31 (sq/ft)
WP = 6.22 (ft)
R = 0.37
Z ACTUAL= 1.19 MUST BE > THAN Z REQ'D. = 1.19
V = 2.71 (ft/sec)
CHANNEL DESIGN SECTION
LINING: CURLED MAT 1.55 #/sq ft > 1.4 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -02a
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
4.13
(Ac.)
C =
0.50
Maximum Allowable Tractive Force
INTENSITY =
5.60
(in/hr)
FLOW =
11.56
(cfs)
DESIGN CRITERIA
1.0 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.017
(ft/ft)
R
0.59
M = 3
:1 (sideslope)
s
0.017 (ft/ft)
DEPTH = 2.00
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
2.28 (ft/s)
Z REQUID= 3.55
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 8.36 (ft)
BW 3.00 (ft)
h 0.89 (ft)
Conservation of Mass Check
Q=VA r11.56 (cfs) 5.07 = 5.07 Ox
F-71-56-1 11.56 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
1.0 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 5.07 (sq/ft)
WP = 8.65 (ft)
R = 0.59
Z ACTUAL= 3.55 MUST BE > THAN Z REQ'D. = 3.55
V = 2.28 (ft/sec)
CHANNEL DESIGN SECTION
LINING: CURLED MAT 1.55 #/sq ft > 1.0 #/sq ft
(TOPW I DTH )
15 ft
2 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -02b
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
1.28 (Ac.)
0.50
5.60 (in/hr)
3.59 (cfs)
DESIGN CRITERIA
1.4 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.068
(ft/ft)
R
0.26
M = 3
:1 (sideslope)
s
0.068 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
2.66 (ft/s)
Z REQUID= 0.55
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 5.02 (ft)
BW 3.00 (ft)
h 0.34 (ft)
Conservation of Mass Check
Q=VA r3.59 (cfs) 1.35 = 1.35 Ox
3.59 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
1.4 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 1.35 (sq/ft)
WP = 5.13 (ft)
R = 0.26
Z ACTUAL= 0.55 MUST BE > THAN Z REQ'D. = 0.55
V = 2.66 (ft/sec)
CHANNEL DESIGN SECTION
LINING: CURLED MAT 1.55 #/sq ft > 1.4 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -03
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
0.28 (Ac.)
0.50
5.60 (in/hr)
0.77 (cfs)
DESIGN CRITERIA
0.7 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.078
(ft/ft)
R
0.12
M = 3
:1 (sideslope)
s
0.078 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
1.68 (ft/s)
Z REQUID= 0.11
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 3.81 (ft)
BW 3.00 (ft)
h 0.14 (ft)
Conservation of Mass Check
Q=VA r0.77 (cfs) 0.46 = 0.46 Ox
0.77 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
0.7 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 0.46 (sq/ft)
WP = 3.86 (ft)
R = 0.12
Z ACTUAL= 0.11 MUST BE > THAN Z REQ'D. = 0.11
V = 1.68 (ft/sec)
CHANNEL DESIGN SECTION
LINING: CURLED MAT 1.55 #/sq ft > 0.7 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -04a
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
0.11 (Ac.)
0.50
5.60 (in/hr)
0.32 (cfs)
DESIGN CRITERIA
0.1 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.016
(ft/ft)
R
0.11
M = 3
:1 (sideslope)
s
0.016 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
0.74 (ft/s)
Z REQUID= 0.10
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 3.77 (ft)
BW 3.00 (ft)
h 0.13 (ft)
Conservation of Mass Check
Q=VA r0.32 (cfs) 0.43 = 0.43 Ox
0.32 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
0.1 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 0.43 (sq/ft)
WP = 3.81 (ft)
R = 0.11
Z ACTUAL= 0.10 MUST BE > THAN Z REQ'D. = 0.10
V = 0.74 (ft/sec)
CHANNEL DESIGN SECTION
LINING: JUTE NET 0.45 #/sq ft > 0.1 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -04b
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
0.55 (Ac.)
0.50
5.60 (in/hr)
1.54 (cfs)
DESIGN CRITERIA
0.3 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.016
(ft/ft)
R
0.25
M = 3
:1 (sideslope)
s
0.016 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
1.24 (ft/s)
Z REQUID= 0.49
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 4.89 (ft)
BW 3.00 (ft)
h 0.31 (ft)
Conservation of Mass Check
Q=VA r1.54 (cfs) 1.24 = 1.24 Ox
1.54 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
0.3 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 1.24 (sq/ft)
WP = 4.99 (ft)
R = 0.25
Z ACTUAL= 0.49 MUST BE > THAN Z REQ'D. = 0.49
V = 1.24 (ft/sec)
CHANNEL DESIGN SECTION
LINING: JUTE NET 0.45 #/sq ft > 0.3 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -05
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
1.43 (Ac.)
0.50
5.60 (in/hr)
3.99 (cfs)
DESIGN CRITERIA
0.8 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.026
(ft/ft)
R
0.34
M = 3
:1 (sideslope)
s
0.026 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
1.97 (ft/s)
Z REQUID= 0.99
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 5.77 (ft)
BW 3.00 (ft)
h 0.46 (ft)
Conservation of Mass Check
Q=VA r3.99 (cfs) 2.03 = 2.03 Ox
3.99 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
0.8 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 2.03 (sq/ft)
WP = 5.92 (ft)
R = 0.34
Z ACTUAL= 0.99 MUST BE > THAN Z REQ'D. = 0.99
V = 1.97 (ft/sec)
CHANNEL DESIGN SECTION
LINING: CURLED MAT 1.55 #/sq ft > 0.8 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -06
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
3.35 (Ac.)
0.50
5.60 (in/hr)
9.37 (cfs)
DESIGN CRITERIA
1.0 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.020
(ft/ft)
R
0.52
M = 3
:1 (sideslope)
s
0.020 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
2.29 (ft/s)
Z REQUID= 2.64
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 7.62 (ft)
BW 3.00 (ft)
h 0.77 (ft)
Conservation of Mass Check
Q=VA r9.37 (cfs) 4.08 = 4.08 Ox
9.37 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
1.0 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 4.08 (sq/ft)
WP = 7.87 (ft)
R = 0.52
Z ACTUAL= 2.64 MUST BE > THAN Z REQ'D. = 2.64
V = 2.29 (ft/sec)
CHANNEL DESIGN SECTION
LINING: CURLED MAT 1.55 #/sq ft > 1.0 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -07
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
3.26 (Ac.)
0.50
5.60 (in/hr)
9.12 (cfs)
DESIGN CRITERIA
1.5 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.036
(ft/ft)
R
0.46
M = 3
:1 (sideslope)
s
0.036 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
2.80 (ft/s)
Z REQUID= 1.93
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 6.93 (ft)
BW 3.00 (ft)
h 0.66 (ft)
Conservation of Mass Check
Q=VA r9.12 (cfs) 3.25 = 3.25 Ox
9.12 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
1.5 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 3.25 (sq/ft)
WP = 7.14 (ft)
R = 0.46
Z ACTUAL= 1.92 MUST BE > THAN Z REQ'D. = 1.93
V = 2.80 (ft/sec)
CHANNEL DESIGN SECTION
LINING: CURLED MAT 1.55 #/sq ft > 1.5 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -08
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
2.16 (Ac.)
0.50
5.60 (in/hr)
6.04 (cfs)
DESIGN CRITERIA
1.2 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.038
(ft/ft)
R
0.38
M = 3
:1 (sideslope)
s
0.038 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
2.54 (ft/s)
Z REQUID= 1.24
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 6.13 (ft)
BW 3.00 (ft)
h 0.52 (ft)
Conservation of Mass Check
Q=VA r6.04 (cfs) 2.38 = 2.38 Ox
6.04 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
1.2 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 2.38 (sq/ft)
WP = 6.30 (ft)
R = 0.38
Z ACTUAL= 1.24 MUST BE > THAN Z REQ'D. = 1.24
V = 2.54 (ft/sec)
CHANNEL DESIGN SECTION
LINING: CURLED MAT 1.55 #/sq ft > 1.2 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -09a
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
2.85 (Ac.)
0.50
5.60 (in/hr)
7.97 (cfs)
DESIGN CRITERIA
1.5 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.039
(ft/ft)
R
0.42
M = 3
:1 (sideslope)
s
0.039 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
2.77 (ft/s)
Z REQUID= 1.62
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 6.60 (ft)
BW 3.00 (ft)
h 0.60 (ft)
Conservation of Mass Check
Q=VA r7.97 (cfs) 2.88 = 2.88 Ox
7.97 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
1.5 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 2.88 (sq/ft)
WP = 6.79 (ft)
R = 0.42
Z ACTUAL= 1.62 MUST BE > THAN Z REQ'D. = 1.62
V = 2.77 (ft/sec)
CHANNEL DESIGN SECTION
LINING: CURLED MAT 1.55 #/sq ft > 1.5 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -09b
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
0.71 (Ac.)
0.50
5.60 (in/hr)
2.00 (cfs)
DESIGN CRITERIA
0.8 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.047
(ft/ft)
R
0.22
M = 3
:1 (sideslope)
s
0.047 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
1.95 (ft/s)
Z REQUID= 0.37
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 4.62 (ft)
BW 3.00 (ft)
h 0.27 (ft)
Conservation of Mass Check
Q=VA r2.00 (cfs) 1.03 = 1.03 OK
2.00 OK
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
0.8 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 1.03 (sq/ft)
WP = 4.70 (ft)
R = 0.22
Z ACTUAL= 0.37 MUST BE > THAN Z REQ'D. = 0.37
V = 1.95 (ft/sec)
CHANNEL DESIGN SECTION
LINING: CURLED MAT 1.55 #/sq ft > 0.8 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -10
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
0.28 (Ac.)
0.50
5.60 (in/hr)
0.77 (cfs)
DESIGN CRITERIA
0.5 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.049
(ft/ft)
R
0.13
M = 3
:1 (sideslope)
s
0.049 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
1.45 (ft/s)
Z REQUID= 0.14
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 3.93 (ft)
BW 3.00 (ft)
h 0.15 (ft)
Conservation of Mass Check
Q=VA r0.77 (cfs) 0.53 = 0.53 Ox
0.77 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
0.5 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 0.53 (sq/ft)
WP = 3.98 (ft)
R = 0.13
Z ACTUAL= 0.14 MUST BE > THAN Z REQ'D. = 0.14
V = 1.45 (ft/sec)
CHANNEL DESIGN SECTION
LINING: CURLED MAT 1.55 #/sq ft > 0.5 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -11
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
1.59 (Ac.)
0.50
5.60 (in/hr)
4.47 (cfs)
DESIGN CRITERIA
0.1 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.002
(ft/ft)
R
0.61
M = 3
:1 (sideslope)
s
0.002 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
0.82 (ft/s)
Z REQUID= 3.94
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 8.64 (ft)
BW 3.00 (ft)
h 0.94 (ft)
Conservation of Mass Check
Q=VA r4.47 (cfs) 5.46 = 5.46 ox
4.47 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
0.1 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 5.46 (sq/ft)
WP = 8.94 (ft)
R = 0.61
Z ACTUAL= 3.93 MUST BE > THAN Z REQ'D. = 3.94
V = 0.82 (ft/sec)
CHANNEL DESIGN SECTION
LINING: JUTE NET 0.45 #/sq ft > 0.1 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -12
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
0.66 (Ac.)
0.50
5.60 (in/hr)
1.85 (cfs)
DESIGN CRITERIA
0.1 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.005
(ft/ft)
R
0.35
M = 3
:1 (sideslope)
s
0.005 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
0.86 (ft/s)
Z REQUID= 1.07
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 5.89 (ft)
BW 3.00 (ft)
h 0.48 (ft)
Conservation of Mass Check
Q=VA r1.85 (cfs) 2.14 = 2.14 Ox
1.85 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
0.1 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 2.14 (sq/ft)
WP = 6.05 (ft)
R = 0.35
Z ACTUAL= 1.07 MUST BE > THAN Z REQ'D. = 1.07
V = 0.86 (ft/sec)
CHANNEL DESIGN SECTION
LINING: JUTE NET 0.45 #/sq ft > 0.1 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -13
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
0.57 (Ac.)
0.50
5.60 (in/hr)
1.60 (cfs)
DESIGN CRITERIA
0.2 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.011
(ft/ft)
R
0.28
M = 3
:1 (sideslope)
s
0.011 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
1.10 (ft/s)
Z REQUID= 0.61
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 5.14 (ft)
BW 3.00 (ft)
h 0.36 (ft)
Conservation of Mass Check
Q=VA r1.60 (cfs) 1.45 = 1.45 Ox
F-7-6-0-1 1.60 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
0.2 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 1.45 (sq/ft)
WP = 5.25 (ft)
R = 0.28
Z ACTUAL= 0.61 MUST BE > THAN Z REQ'D. = 0.61
V = 1.10 (ft/sec)
CHANNEL DESIGN SECTION
LINING: JUTE NET 0.45 #/sq ft > 0.2 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -14
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
0.80 (Ac.)
0.50
5.60 (in/hr)
2.23 (cfs)
DESIGN CRITERIA
0.3 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.013
(ft/ft)
R
0.31
M = 3
:1 (sideslope)
s
0.013 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
1.31 (ft/s)
Z REQUID= 0.78
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 5.43 (ft)
BW 3.00 (ft)
h 0.40 (ft)
Conservation of Mass Check
Q=VA r2.23 (cfs) 1.71 = 1.71 Ox
2.23 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
0.3 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 1.71 (sq/ft)
WP = 5.56 (ft)
R = 0.31
Z ACTUAL= 0.78 MUST BE > THAN Z REQ'D. = 0.78
V = 1.31 (ft/sec)
CHANNEL DESIGN SECTION
LINING: JUTE NET 0.45 #/sq ft > 0.3 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -15
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
0.98 (Ac.)
0.50
5.60 (in/hr)
2.73 (cfs)
DESIGN CRITERIA
0.1 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.003
(ft/ft)
R
0.46
M = 3
:1 (sideslope)
s
0.003 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
0.84 (ft/s)
Z REQUID= 1.93
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 6.93 (ft)
BW 3.00 (ft)
h 0.66 (ft)
Conservation of Mass Check
Q=VA r2.73 (cfs) 3.25 = 3.25 Ox
2.73 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
0.1 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 3.25 (sq/ft)
WP = 7.14 (ft)
R = 0.46
Z ACTUAL= 1.93 MUST BE > THAN Z REQ'D. = 1.93
V = 0.84 (ft/sec)
CHANNEL DESIGN SECTION
LINING: JUTE NET 0.45 #/sq ft > 0.1 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -16
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
0.87 (Ac.)
0.50
5.60 (in/hr)
2.45 (cfs)
DESIGN CRITERIA
0.5 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.019
(ft/ft)
R
0.29
M = 3
:1 (sideslope)
s
0.019 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
1.53 (ft/s)
Z REQUID= 0.71
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 5.31 (ft)
BW 3.00 (ft)
h 0.39 (ft)
Conservation of Mass Check
Q=VA r2.45 (cfs) 1.60 = 1.60 ox
F--2-45-1 2.45 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
0.5 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 1.60 (sq/ft)
WP = 5.44 (ft)
R = 0.29
Z ACTUAL= 0.71 MUST BE > THAN Z REQ'D. = 0.71
V = 1.53 (ft/sec)
CHANNEL DESIGN SECTION
LINING: CURLED MAT 1.55 #/sq ft > 0.5 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -17
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
0.66 (Ac.)
0.50
5.60 (in/hr)
1.84 (cfs)
DESIGN CRITERIA
0.5 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.029
(ft/ft)
R
0.23
M = 3
:1 (sideslope)
s
0.029 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
1.61 (ft/s)
Z REQUID= 0.43
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 4.76 (ft)
BW 3.00 (ft)
h 0.29 (ft)
Conservation of Mass Check
Q=VA r1.84 (cfs) 1.14 = 1.14 ox
1.84 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
0.5 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 1.14 (sq/ft)
WP = 4.86 (ft)
R = 0.23
Z ACTUAL= 0.43 MUST BE > THAN Z REQ'D. = 0.43
V = 1.61 (ft/sec)
CHANNEL DESIGN SECTION
LINING: CURLED MAT 1.55 #/sq ft > 0.5 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -18
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
0.30 (Ac.)
0.50
5.60 (in/hr)
0.83 (cfs)
DESIGN CRITERIA
0.4 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.033
(ft/ft)
R
0.15
M = 3
:1 (sideslope)
s
0.033 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
1.29 (ft/s)
Z REQUID= 0.18
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 4.09 (ft)
BW 3.00 (ft)
h 0.18 (ft)
Conservation of Mass Check
Q=VA r0.83 (cfs) 0.64 = 0.64 Ox
F----0831 0.83 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
0.4 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 0.64 (sq/ft)
WP = 4.14 (ft)
R = 0.15
Z ACTUAL= 0.18 MUST BE > THAN Z REQ'D. = 0.18
V = 1.29 (ft/sec)
CHANNEL DESIGN SECTION
LINING: JUTE NET 0.45 #/sq ft > 0.4 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -19
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
0.35 (Ac.)
0.50
5.60 (in/hr)
0.97 (cfs)
DESIGN CRITERIA
0.4 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.036
(ft/ft)
R
0.16
M = 3
:1 (sideslope)
s
0.036 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
1.40 (ft/s)
Z REQUID= 0.21
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 4.16 (ft)
BW 3.00 (ft)
h 0.19 (ft)
Conservation of Mass Check
Q=VA r0.97 (cfs) 0.69 = 0.69 ox
0.97 ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
0.4 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 0.69 (sq/ft)
WP = 4.22 (ft)
R = 0.16
Z ACTUAL= 0.21 MUST BE > THAN Z REQ'D. = 0.21
V = 1.40 (ft/sec)
CHANNEL DESIGN SECTION
LINING: JUTE NET 0.45 #/sq ft > 0.4 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -20
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
2.06 (Ac.)
0.75
5.60 (in/hr)
8.65 (cfs)
DESIGN CRITERIA
1.7 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.047
(ft/ft)
R
0.42
M = 3
:1 (sideslope)
s
0.047 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
3.02 (ft/s)
Z REQUID= 1.61
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 6.59 (ft)
BW 3.00 (ft)
h 0.60 (ft)
Conservation of Mass Check
Q=VA r8.65 (cfs) 2.86 = 2.86 Ox
8.65 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
1.7 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 2.86 (sq/ft)
WP = 6.78 (ft)
R = 0.42
Z ACTUAL= 1.61 MUST BE > THAN Z REQ'D. = 1.61
V = 3.02 (ft/sec)
CHANNEL DESIGN SECTION
LINING: TURF REINF MATTING 3.20 #/sq ft > 1.7 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -21
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
4.05
(Ac.)
C =
0.75
Maximum Allowable Tractive Force
INTENSITY =
5.60
(in/hr)
FLOW =
17.03
(cfs)
DESIGN CRITERIA
3.0 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.062
(ft/ft)
R
0.53
M = 3
:1 (sideslope)
s
0.062 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
4.05 (ft/s)
Z REQUID= 2.75
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 7.71 (ft)
BW 3.00 (ft)
h 0.79 (ft)
Conservation of Mass Check
Q=VA r17.03 (cfs) 4.21 = 4.21 Ox
F-77-03-1 17.03 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
3.0 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 4.21 (sq/ft)
WP = 7.97 (ft)
R = 0.53
Z ACTUAL= 2.75 MUST BE > THAN Z REQ'D. = 2.75
V = 4.05 (ft/sec)
CHANNEL DESIGN SECTION
LINING: TURF REINF MATTING 3.20 #/sq ft > 3.0 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

7
STEWART
CHANNEL DESIGN CALCULATIONS
DD -22
PROJECT: NC Agricultural Sciences Center
PROJECT # C16123
DATE: 13 -Sep -18
REVISED:
2 YEAR CHANNEL FLOW DATA
AREA =
C =
INTENSITY =
FLOW =
1.06 (Ac.)
0.75
5.60 (in/hr)
4.43 (cfs)
DESIGN CRITERIA
1.4 (#/sq ft)
CHANNEL DIMENSIONS
Maximum Allowable Tractive Force
N = 0.060
(Mannings 'n')
VELOCITY
(#/sq ft)
SLOPE= 0.054
(ft/ft)
R
0.31
M = 3
:1 (sideslope)
s
0.054 (ft/ft)
DEPTH = 1.50
(ft)
n
0.060 (Mannings 'n')
WIDTH = 3
(ft) Bottom Width
V
2.62 (ft/s)
Z REQUID= 0.77
R^(2/3)
7.50
(#/sq ft)
Wetted Dimensions
TW 5.41 (ft)
BW 3.00 (ft)
h 0.40 (ft)
Conservation of Mass Check
Q=VA r4.43 (cfs) 1.69 = 1.69 Ox
F--4-43-1 4.43 Ox
TRACTIVE FORCE
T =Y*D*S Tractive Force (#/sq ft)
Y =WEIGHT OF WATER (62.4 #/cf)
D = DEPTH OF FLOW IN CHANNEL (ft)
S = SLOPE OF CHANNEL (ft/ft)
T =
1.4 (#/sq ft)
Maximum Allowable Tractive Force
L
JUTE NET
0.45
(#/sq ft)
I
CURLED MAT
1.55
(#/sq ft)
N
TURF REINF. MATTING
3.20
(#/sq ft)
I
CLASS B RIPRAP
3.50
(#/sq ft)
N
CLASS I RIPRAP
5.00
(#/sq ft)
G
CLASS II RIPRAP
7.50
(#/sq ft)
Z ACTUAL
AREA = 1.69 (sq/ft)
WP = 5.54 (ft)
R = 0.31
Z ACTUAL= 0.77 MUST BE > THAN Z REQ'D. = 0.77
V = 2.62 (ft/sec)
CHANNEL DESIGN SECTION
LINING: CURLED MAT 1.55 #/sq ft > 1.4 #/sq ft
(TOPW I DTH )
12 ft
1.5 ft \ /
(DEPTH) \ /
3 ft
(BOTTOM WIDTH)
223 S. West Street, Suite 1100, Raleigh, NC 27603 Tel [phone] Fax [phone] www.stewartinc.com

,"�A
STEWART
Skimmer Sediment Basin Sizing
North Carolina Erosion and Sedimentation Planning and Design Manual
Project Name: CoLab
Project #: C16123
Sediment Basin ID: BASIN 1A
Trap Location:
Flow: Disturbed earth =
5.33
@ c=
0.50
Undist., wooded areas =
0.00
@ c=
0.25
Undist., grassy areas =
0.00
@ c=
0.30
Other areas =
0.00
@ c=
0.95
Total Area (ac)
= 5.33 @ c= 0.50
Flow Length
= 935 ft
High Point
= 448 ft
Low Point
= 426 ft
Calculated
Time of Concentration "Tc"
25 -year Intensity =
10 -year Intensity =
Flow "Q10 = CIA"
= 6.42 min (Kirpich Formula)
7.88 in/hr (from local i -d -f curve/table)
7.15 in/hr (from local i -d -f curve/table)
=1 19.05 cfs
Trap Volume: Minimum Required Volume = 1800 cf/acre drainage area per year
Volume Required (cf) = 9,592.77 cf
Minimum Required Surface Area = 435 sf per cfs in 10 year storm
Surface Area Required (sf) = 8287.75 sf
Shape is assumed to be trapezoidal - excavation may be required
Depth of Basin (ft) _
Sideslopes (h:1) _
Surface Width (ft) = N/A
Surface Length (ft) = N/A
Bottom Width (ft)
Bottom Length (ft)
Bottom Area (sf)
Surface Area (sf)
Volume Provided (cf)
2 ft (from surface - 3.5 ft maximum)
2 :1 (2:1 minimum)
ft
ft (try to be 2X width)
N/A ft
N/A ft
= 4867 sf
= 10,587.00 sf 8288 OK
15,454.00 cf > 9592.77 OK

Stone Required Capacity = Peak Flow from a 25 yr storm event.
Required Capacity (cfs) =
19.05 cfs
Sideslopes (h:1) = 2 :1
Bottom Width (ft) = 15 ft
min = 12ft
Depth of flow (ft) = 0.50 ft
(max. 0.5 ft)
Provided Capacity = 2.56*M*h^2.5+3.09*B*h^1.5
(Trapezoidal Weir)
Spillway Capacity (cfs) =
17.29 cfs NG
Design riser skimmer (Assuming Faircloth Skimmer):
Storage Volume = 15,454 cf
Skimmer Size = 3 in
(use 1.5, 2, 2.5, 3, 4, 6, or 8 -inch)
Head on Skimmer = 0.250 ft
Orifice Size = 2.00 in
(1/4 inch increments)
Dewatering Time = 3.35 days
(2-5 days, target 3 days)
Sediment Basin Summary: Basin ID =
BASIN 1A
Bottom Area =
4867 sf
Bottom Length =
N/A ft
Surface Area =
11647 sf
Surface Length =
N/A ft
Top Width =
N/A ft
Top Length =
N/A ft
Stone Outlet Width =
15 ft
Outlet Sideslopes =
2 :1
Storage Depth =
2 ft
Dam Height =
3.5 ft
Sideslopes =
2 :1
Skimmer Size =
3 in
Head on Skimmer =
0.250 ft
Orifice Size =
2.00 in
Note: All Calculations are based on a 10 year return rainfall and in accordance with
the North Carolina Erosion and Sedimentation Planning and Design Manual.

,"�A
STEWART
Skimmer Sediment Basin Sizing
North Carolina Erosion and Sedimentation Planning and Design Manual
Project Name: Co located Lab
Project #: C16123
Sediment Basin ID: BASIN 1B
Trap Location:
Flow: Disturbed earth =
4.02
@ c=
0.50
Undist., wooded areas =
0.00
@ c=
0.25
Undist., grassy areas =
0.00
@ c=
0.30
Other areas =
0.00
@ c=
0.95
Total Area (ac)
= 4.02 @ c= 0.50
Flow Length
= 500 ft
High Point
= 442 ft
Low Point
= 410 ft
Calculated
Time of Concentration "Tc"
25 -year Intensity =
10 -year Intensity =
Flow "Q10 = CIA"
= 5.00 min (Kirpich Formula)
7.88 in/hr (from local i -d -f curve/table)
7.15 in/hr (from local i -d -f curve/table)
=1 14.36 cfs
Trap Volume: Minimum Required Volume = 1800 cf/acre drainage area per year
Volume Required (cf) = 7,232.23 cf
Minimum Required Surface Area = 435 sf per cfs in 10 year storm
Surface Area Required (sf) = 6248.3466 sf
Shape is assumed to be trapezoidal - excavation may be required
Depth of Basin (ft) _
Sideslopes (h:1) _
Surface Width (ft) _
Surface Length (ft) _
Bottom Width (ft)
Bottom Length (ft)
Bottom Area (sf)
Surface Area (sf)
Volume Provided (cf)
2 ft (from surface - 3.5 ft maximum)
3 :1 (2:1 minimum)
60 ft
120 ft (try to be 2X width)
= 48 ft
= 108 ft
= 5184 sf
= 6,717.00 sf 6248 OK
11,901.00 cf > 7232.23 OK

Stone Required Capacity = Peak Flow from a 25 yr storm event.
Required Capacity (cfs) =
14.36 cfs
Sideslopes (h:1) = 2 :1
Bottom Width (ft) = 16 ft
min = 12ft
Depth of flow (ft) = 0.50 ft
(max. 0.5 ft)
Provided Capacity = 2.56*M*h^2.5+3.09*B*h^1.5
(Trapezoidal Weir)
Spillway Capacity (cfs) =
18.38 cfs OK
Design riser skimmer (Assuming Faircloth Skimmer):
Storage Volume = 11,901 cf
Skimmer Size = 2 in
(use 1.5, 2, 2.5, 3, 4, 6, or 8 -inch)
Head on Skimmer = 0.125 ft
Orifice Size = 2.00 in
(1/4 inch increments)
Dewatering Time = 3.64 days
(2-5 days, target 3 days)
Sediment Basin Summary: Basin ID =
BASIN 1B
Bottom Width =
48 ft
Bottom Length =
108 ft
Surface Width =
60 ft
Surface Length =
120 ft
Top Width =
69 ft
Top Length =
129 ft
Stone Outlet Width =
16 ft
Outlet Sideslopes =
2 :1
Storage Depth =
2 ft
Dam Height =
3.5 ft
Sideslopes =
3 :1
Skimmer Size =
2 in
Head on Skimmer =
0.125 ft
Orifice Size =
2.00 in
Note: All Calculations are based on a 10 year return rainfall and in accordance with
the North Carolina Erosion and Sedimentation Planning and Design Manual.

,"�A
STEWART
Skimmer Sediment Basin Sizing
North Carolina Erosion and Sedimentation Planning and Design Manual
Project Name: Colab
Project #: C16123
Sediment Basin ID: BASIN 1C
Trap Location:
Flow: Disturbed earth =
1.20
@ c=
0.50
Undist., wooded areas =
0.00
@ c=
0.25
Undist., grassy areas =
0.00
@ c=
0.30
Other areas =
0.00
@ c=
0.95
Total Area (ac)
= 1.20 @ c= 0.50
Flow Length
= 430 ft
High Point
= 441 ft
Low Point
= 423 ft
Calculated
Time of Concentration "Tc"
25 -year Intensity =
10 -year Intensity =
Flow "Q10 = CIA"
= 5.00 min (Kirpich Formula)
7.88 in/hr (from local i -d -f curve/table)
7.15 in/hr (from local i -d -f curve/table)
=1 4.28 cfs
Trap Volume: Minimum Required Volume = 1800 cf/acre drainage area per year
Volume Required (cf) = 2,155.62 cf
Minimum Required Surface Area = 435 sf per cfs in 10 year storm
Surface Area Required (sf) = 1862.3657 sf
Shape is assumed to be trapezoidal - excavation may be required
Depth of Basin (ft) _
Sideslopes (h:1) _
Surface Width (ft) _
Surface Length (ft) _
Bottom Width (ft)
Bottom Length (ft)
Bottom Area (sf)
Surface Area (sf)
Volume Provided (cf)
2 ft (from surface - 3.5 ft maximum)
3 :1 (2:1 minimum)
23 ft
100 ft (try to be 2X width)
11 ft
= 88 ft
= 968 sf
= 2,300.00 sf 1862 OK
= 3,268.00 cf > 2155.62 OK

Stone Required Capacity = Peak Flow from a 25 yr storm event.
Required Capacity (cfs) =
4.28 cfs
Sideslopes (h:1) = 2 :1
Bottom Width (ft) = 6 ft
min = 6ft
Depth of flow (ft) = 0.50 ft
(max. 0.5 ft)
Provided Capacity = 2.56*M*h^2.5+3.09*B*h^1.5
(Trapezoidal Weir)
Spillway Capacity (cfs) =
7.46 cfs OK
Design riser skimmer (Assuming Faircloth Skimmer):
Storage Volume = 3,268 cf
Skimmer Size = 3 in
(use 1.5, 2, 2.5, 3, 4, 6, or 8 -inch)
Head on Skimmer = 0.250 ft
Orifice Size = 1.00 in
(1/4 inch increments)
Dewatering Time = 2.83 days
(2-5 days, target 3 days)
Sediment Basin Summary: Basin ID =
BASIN 1C
Bottom Width =
11 ft
Bottom Length =
88 ft
Surface Width =
23 ft
Surface Length =
100 ft
Top Width =
32 ft
Top Length =
109 ft
Stone Outlet Width =
6 ft
Outlet Sideslopes =
2 :1
Storage Depth =
2 ft
Dam Height =
3.5 ft
Sideslopes =
3 :1
Skimmer Size =
3 in
Head on Skimmer =
0.250 ft
Orifice Size =
1.00 in
Note: All Calculations are based on a 10 year return rainfall and in accordance with
the North Carolina Erosion and Sedimentation Planning and Design Manual.

,"�A
STEWART
Skimmer Sediment Basin Sizing
North Carolina Erosion and Sedimentation Planning and Design Manual
Project Name: CoLab
Project #: C16123
Sediment Basin ID: BASIN 2A
Trap Location:
Flow: Disturbed earth =
5.21
@ c=
0.50
Undist., wooded areas =
0.00
@ c=
0.25
Undist., grassy areas =
0.00
@ c=
0.30
Other areas =
0.00
@ c=
0.95
Total Area (ac)
= 5.21 @ c= 0.50
Flow Length
= 935 ft
High Point
= 448 ft
Low Point
= 426 ft
Calculated
Time of Concentration "Tc"
25 -year Intensity =
10 -year Intensity =
Flow "Q10 = CIA"
= 6.42 min (Kirpich Formula)
7.88 in/hr (from local i -d -f curve/table)
7.15 in/hr (from local i -d -f curve/table)
=1 18.61 cfs
Trap Volume: Minimum Required Volume = 1800 cf/acre drainage area per year
Volume Required (cf) = 9,370.50 cf
Minimum Required Surface Area = 435 sf per cfs in 10 year storm
Surface Area Required (sf) = 8095.72 sf
Shape is assumed to be trapezoidal - excavation may be required
Depth of Basin (ft) _
Sideslopes (h:1) _
Surface Width (ft) = N/A
Surface Length (ft) = N/A
Bottom Width (ft)
Bottom Length (ft)
Bottom Area (sf)
Surface Area (sf)
Volume Provided (cf)
2 ft (from surface - 3.5 ft maximum)
2 :1 (2:1 minimum)
ft
ft (try to be 2X width)
N/A ft
N/A ft
= 4867 sf
= 8,923.00 sf 8096 OK
13,790.00 cf > 9370.5 OK

Stone Required Capacity = Peak Flow from a 25 yr storm event.
Required Capacity (cfs) =
18.61 cfs
Sideslopes (h:1) = 2 :1
Bottom Width (ft) = 15 ft
min = 12ft
Depth of flow (ft) = 0.50 ft
(max. 0.5 ft)
Provided Capacity = 2.56*M*h^2.5+3.09*B*h^1.5
(Trapezoidal Weir)
Spillway Capacity (cfs) =
17.29 cfs NG
Design riser skimmer (Assuming Faircloth Skimmer):
Storage Volume = 13,790 cf
Skimmer Size = 3 in
(use 1.5, 2, 2.5, 3, 4, 6, or 8 -inch)
Head on Skimmer = 0.250 ft
Orifice Size = 2.00 in
(1/4 inch increments)
Dewatering Time = 2.98 days
(2-5 days, target 3 days)
Sediment Basin Summary: Basin ID =
BASIN 2A
Bottom Area =
4867 sf
Bottom Length =
N/A ft
Surface Area =
8,923.00 sf
Surface Length =
N/A ft
Top Width =
N/A ft
Top Length =
N/A ft
Stone Outlet Width =
15 ft
Outlet Sideslopes =
2 :1
Storage Depth =
2 ft
Dam Height =
3.5 ft
Sideslopes =
2 :1
Skimmer Size =
3 in
Head on Skimmer =
0.250 ft
Orifice Size =
2.00 in
Note: All Calculations are based on a 10 year return rainfall and in accordance with
the North Carolina Erosion and Sedimentation Planning and Design Manual.

,"�A
STEWART
Skimmer Sediment Basin Sizing
North Carolina Erosion and Sedimentation Planning and Design Manual
Project Name: Colab
Project #: C16123
Sediment Basin ID: BASIN 2B
Trap Location:
Flow: Disturbed earth =
0.57
@ c=
0.50
Undist., wooded areas =
0.00
@ c=
0.25
Undist., grassy areas =
0.00
@ c=
0.30
Other areas =
0.00
@ c=
0.95
Total Area (ac)
= 0.57 @ c= 0.50
Flow Length
= 450 ft
High Point
= 442 ft
Low Point
= 423 ft
Calculated
Time of Concentration "Tc"
25 -year Intensity =
10 -year Intensity =
Flow "Q10 = CIA"
= 5.00 min (Kirpich Formula)
7.88 in/hr (from local i -d -f curve/table)
7.15 in/hr (from local i -d -f curve/table)
=1 2.03 cfs
Trap Volume: Minimum Required Volume = 1800 cf/acre drainage area per year
Volume Required (cf) = 1,022.77 cf
Minimum Required Surface Area = 435 sf per cfs in 10 year storm
Surface Area Required (sf) = 883.62945 sf
Shape is assumed to be trapezoidal - excavation may be required
Depth of Basin (ft) _
Sideslopes (h:1) _
Surface Width (ft) _
Surface Length (ft) _
Bottom Width (ft)
Bottom Length (ft)
Bottom Area (sf)
Surface Area (sf)
Volume Provided (cf)
2 ft (from surface - 3.5 ft maximum)
3 :1 (2:1 minimum)
24 ft
48 ft (try to be 2X width)
12 ft
= 36 ft
= 432 sf
= 1,087.00 sf 884 OK
1,519.00 cf > 1022.77 OK

Stone Required Capacity = Peak Flow from a 25 yr storm event.
Required Capacity (cfs) =
2.03 cfs
Sideslopes (h:1) = 2 :1
Bottom Width (ft) = 6 ft
min = 4ft
Depth of flow (ft) = 0.50 ft
(max. 0.5 ft)
Provided Capacity = 2.56*M*h^2.5+3.09*B*h^1.5
(Trapezoidal Weir)
Spillway Capacity (cfs) =
7.46 cfs OK
Design riser skimmer (Assuming Faircloth Skimmer):
Storage Volume = 1,519 cf
Skimmer Size = 2 in
(use 1.5, 2, 2.5, 3, 4, 6, or 8 -inch)
Head on Skimmer = 0.125 ft
Orifice Size = 0.75 in
(1/4 inch increments)
Dewatering Time = 3.31 days
(2-5 days, target 3 days)
Sediment Basin Summary: Basin ID =
BASIN 2B
Bottom Area =
432 sf
Bottom Length =
36 ft
Surface Area =
1,087.00 sf
Surface Length =
48 ft
Top Width =
N/A ft
Top Length =
N/A ft
Stone Outlet Width =
6 ft
Outlet Sideslopes =
2 :1
Storage Depth =
2 ft
Dam Height =
3.5 ft
Sideslopes =
3 :1
Skimmer Size =
2 in
Head on Skimmer =
0.125 ft
Orifice Size =
0.75 in
Note: All Calculations are based on a 10 year return rainfall and in accordance with
the North Carolina Erosion and Sedimentation Planning and Design Manual.

,"�A
STEWART
Skimmer Sediment Basin Sizing
North Carolina Erosion and Sedimentation Planning and Design Manual
Project Name: Colab
Project #: C16123
Sediment Basin ID: BASIN 2G
Trap Location:
Flow: Disturbed earth =
1.49
@ c=
0.50
Undist., wooded areas =
0.17
@ c=
0.25
Undist., grassy areas =
0.00
@ c=
0.30
Other areas =
0.00
@ c=
0.95
Total Area (ac)
= 1.66 @ c= 0.47
Flow Length
= 320 ft
High Point
= 443 ft
Low Point
= 429 ft
Calculated
Time of Concentration "Tc"
25 -year Intensity =
10 -year Intensity =
Flow "Q10 = CIA"
= 5.00 min (Kirpich Formula)
7.88 in/hr (from local i -d -f curve/table)
7.15 in/hr (from local i -d -f curve/table)
=1 5.62 cfs
Trap Volume: Minimum Required Volume = 1800 cf/acre drainage area per year
Volume Required (cf) = 2,983.02 cf
Minimum Required Surface Area = 435 sf per cfs in 10 year storm
Surface Area Required (sf) = 2443.5919 sf
Shape is assumed to be trapezoidal - excavation may be required
Depth of Basin (ft) _
Sideslopes (h:1) _
Surface Width (ft) _
Surface Length (ft) _
Bottom Width (ft)
Bottom Length (ft)
Bottom Area (sf)
Surface Area (sf)
Volume Provided (cf)
2 ft (from surface - 3.5 ft maximum)
3 :1 (2:1 minimum)
20 ft
40 ft (try to be 2X width)
= 8 ft
= 28 ft
1492 sf
= 2,566.00 sf 2444 OK
= 4,058.00 cf > 2983.02 OK

Stone Required Capacity = Peak Flow from a 25 yr storm event.
Required Capacity (cfs) =
5.62 cfs
Sideslopes (h:1) = 2 :1
Bottom Width (ft) = 6 ft
min = 6ft
Depth of flow (ft) = 0.50 ft
(max. 0.5 ft)
Provided Capacity = 2.56*M*h^2.5+3.09*B*h^1.5
(Trapezoidal Weir)
Spillway Capacity (cfs) =
7.46 cfs OK
Design riser skimmer (Assuming Faircloth Skimmer):
Storage Volume = 4,058 cf
Skimmer Size = 2 in
(use 1.5, 2, 2.5, 3, 4, 6, or 8 -inch)
Head on Skimmer = 0.125 ft
Orifice Size = 1.25 in
(1/4 inch increments)
Dewatering Time = 3.18 days
(2-5 days, target 3 days)
Sediment Basin Summary: Basin ID =
BASIN 2G
Bottom Width =
8 ft
Bottom Length =
28 ft
Surface Width =
20 ft
Surface Length =
40 ft
Top Width =
29 ft
Top Length =
49 ft
Stone Outlet Width =
6 ft
Outlet Sideslopes =
2 :1
Storage Depth =
2 ft
Dam Height =
3.5 ft
Sideslopes =
3 :1
Skimmer Size =
2 in
Head on Skimmer =
0.125 ft
Orifice Size =
1.25 in
Note: All Calculations are based on a 10 year return rainfall and in accordance with
the North Carolina Erosion and Sedimentation Planning and Design Manual.

,"�A
STEWART
Skimmer Sediment Basin Sizing
North Carolina Erosion and Sedimentation Planning and Design Manual
Project Name: Colab
Project #: C16123
Sediment Basin ID: BASIN 23
Trap Location:
Flow: Disturbed earth =
1.72
@ c=
0.50
Undist., wooded areas =
0.00
@ c=
0.25
Undist., grassy areas =
0.00
@ c=
0.30
Other areas =
0.00
@ c=
0.95
Total Area (ac)
= 1.72 @ c= 0.50
Flow Length
= 398 ft
High Point
= 444 ft
Low Point
= 439 ft
Calculated
Time of Concentration "Tc"
25 -year Intensity =
10 -year Intensity =
Flow "Q10 = CIA"
= 5.00 min (Kirpich Formula)
7.88 in/hr (from local i -d -f curve/table)
7.15 in/hr (from local i -d -f curve/table)
=1 6.15 cfs
Trap Volume: Minimum Required Volume = 1800 cf/acre drainage area per year
Volume Required (cf) = 3,095.54 cf
Minimum Required Surface Area = 435 sf per cfs in 10 year storm
Surface Area Required (sf) = 2674.4152 sf
Shape is assumed to be trapezoidal - excavation may be required
Depth of Basin (ft) _
Sideslopes (h:1) _
Surface Width (ft) _
Surface Length (ft) _
Bottom Width (ft)
Bottom Length (ft)
Bottom Area (sf)
Surface Area (sf)
Volume Provided (cf)
2 ft (from surface - 3.5 ft maximum)
3 :1 (2:1 minimum)
20 ft
40 ft (try to be 2X width)
70 ft
= 100 ft
= 4143 sf
= 5,227.00 sf 2674 OK
= 9,370.00 cf > 3095.54 OK

Stone Required Capacity = Peak Flow from a 25 yr storm event.
Required Capacity (cfs) =
6.15 cfs
Sideslopes (h:1) = 2 :1
Bottom Width (ft) = 6 ft
min = 6ft
Depth of flow (ft) = 0.50 ft
(max. 0.5 ft)
Provided Capacity = 2.56*M*h^2.5+3.09*B*h^1.5
(Trapezoidal Weir)
Spillway Capacity (cfs) =
7.46 cfs OK
Design riser skimmer (Assuming Faircloth Skimmer):
Storage Volume = 9,370 cf
Skimmer Size = 2 in
(use 1.5, 2, 2.5, 3, 4, 6, or 8 -inch)
Head on Skimmer = 0.125 ft
Orifice Size = 2.00 in
(1/4 inch increments)
Dewatering Time = 2.87 days
(2-5 days, target 3 days)
Sediment Basin Summary: Basin ID =
BASIN 23
Bottom Area =
4143 sf
Bottom Length =
100 ft
Surface Area =
5,227.00 sf
Surface Length =
40 ft
Top Width =
N/A ft
Top Length =
N/A ft
Stone Outlet Width =
6 ft
Outlet Sideslopes =
2 :1
Storage Depth =
2 ft
Dam Height =
3.5 ft
Sideslopes =
3 :1
Skimmer Size =
2 in
Head on Skimmer =
0.125 ft
Orifice Size =
2.00 in
Note: All Calculations are based on a 10 year return rainfall and in accordance with
the North Carolina Erosion and Sedimentation Planning and Design Manual.

,"�A
STEWART
Skimmer Sediment Basin Sizing
North Carolina Erosion and Sedimentation Planning and Design Manual
Project Name: CoLab
Project #: C16123
Sediment Basin ID: BASIN 3A
Trap Location:
Flow: Disturbed earth =
2.21
@ c=
0.50
Undist., wooded areas =
0.00
@ c=
0.25
Undist., grassy areas =
2.21
@ c=
0.30
Other areas =
0.00
@ c=
0.95
Total Area (ac)
= 4.42 @ c= 0.40
Flow Length
= 1169 ft
High Point
= 448 ft
Low Point
= 426 ft
Calculated
Time of Concentration "Tc"
25 -year Intensity =
10 -year Intensity =
Flow "Q10 = CIA"
= 8.30 min (Kirpich Formula)
7.88 in/hr (from local i -d -f curve/table)
7.15 in/hr (from local i -d -f curve/table)
=1 12.63 cfs
Trap Volume: Minimum Required Volume = 1800 cf/acre drainage area per year
Volume Required (cf) = 7,948.22 cf
Minimum Required Surface Area = 435 sf per cfs in 10 year storm
Surface Area Required (sf) = 5493.55 sf
Shape is assumed to be trapezoidal - excavation may be required
Depth of Basin (ft) _
Sideslopes (h:1) _
Surface Width (ft) = N/A
Surface Length (ft) = N/A
Bottom Width (ft)
Bottom Length (ft)
Bottom Area (sf)
Surface Area (sf)
Volume Provided (cf)
2 ft (from surface - 3.5 ft maximum)
2 :1 (2:1 minimum)
ft
ft (try to be 2X width)
N/A ft
N/A ft
= 4867 sf
= 11,444.00 sf 5494 OK
16,311.00 cf > 7948.22 OK

Stone Required Capacity = Peak Flow from a 25 yr storm event.
Required Capacity (cfs) =
12.63 cfs
Sideslopes (h:1) = 2 :1
Bottom Width (ft) = 40 ft
min = 12ft
Depth of flow (ft) = 0.50 ft
(max. 0.5 ft)
Provided Capacity = 2.56*M*h^2.5+3.09*B*h^1.5
(Trapezoidal Weir)
Spillway Capacity (cfs) =
44.60 cfs OK
Design riser skimmer (Assuming Faircloth Skimmer):
Storage Volume = 16,311 cf
Skimmer Size = 3 in
(use 1.5, 2, 2.5, 3, 4, 6, or 8 -inch)
Head on Skimmer = 0.250 ft
Orifice Size = 2.00 in
(1/4 inch increments)
Dewatering Time = 3.53 days
(2-5 days, target 3 days)
Sediment Basin Summary: Basin ID =
BASIN 3A
Bottom Area =
4867 sf
Bottom Length =
N/A ft
Surface Area =
11,444.00 sf
Surface Length =
N/A ft
Top Width =
N/A ft
Top Length =
N/A ft
Stone Outlet Width =
40 ft
Outlet Sideslopes =
2 :1
Storage Depth =
2 ft
Dam Height =
3.5 ft
Sideslopes =
2 :1
Skimmer Size =
3 in
Head on Skimmer =
0.250 ft
Orifice Size =
2.00 in
Note: All Calculations are based on a 10 year return rainfall and in accordance with
the North Carolina Erosion and Sedimentation Planning and Design Manual.

,"�A
STEWART
Skimmer Sediment Basin Sizing
North Carolina Erosion and Sedimentation Planning and Design Manual
Project Name: Colab
Project #: C16123
Sediment Basin ID: BASIN 3B
Trap Location:
Flow: Disturbed earth =
0.42
@ c=
0.50
Undist., wooded areas =
0.00
@ c=
0.25
Undist., grassy areas =
0.00
@ c=
0.30
Other areas =
0.42
@ c=
0.95
Total Area (ac)
= 0.84 @ c= 0.73
Flow Length
= 450 ft
High Point
= 442 ft
Low Point
= 423 ft
Calculated
Time of Concentration "Tc"
25 -year Intensity =
10 -year Intensity =
Flow "Q10 = CIA"
= 5.00 min (Kirpich Formula)
7.88 in/hr (from local i -d -f curve/table)
7.15 in/hr (from local i -d -f curve/table)
=1 4.35 cfs
Trap Volume: Minimum Required Volume = 1800 cf/acre drainage area per year
Volume Required (cf) = 11510.50 cf
Minimum Required Surface Area = 435 sf per cfs in 10 year storm
Surface Area Required (sf) = 1892.258 sf
Shape is assumed to be trapezoidal - excavation may be required
Depth of Basin (ft) _
Sideslopes (h:1) _
Surface Width (ft) _
Surface Length (ft) _
Bottom Width (ft)
Bottom Length (ft)
Bottom Area (sf)
Surface Area (sf)
Volume Provided (cf)
2 ft
(from surface - 3.5 ft maximum)
3 :1
(2:1 minimum)
24 ft
48 ft
(try to be 2X width)
=
NA ft
=
Na ft
=
1656 sf
=
2,499.00 sf 1892 OK
=
4,155.00 cf > 1510.5 OK

Stone Required Capacity = Peak Flow from a 25 yr storm event.
Required Capacity (cfs) =
4.35 cfs
Sideslopes (h:1) = 2 :1
Bottom Width (ft) = 6 ft
min = 4ft
Depth of flow (ft) = 0.50 ft
(max. 0.5 ft)
Provided Capacity = 2.56*M*h^2.5+3.09*B*h^1.5
(Trapezoidal Weir)
Spillway Capacity (cfs) =
7.46 cfs OK
Design riser skimmer (Assuming Faircloth Skimmer):
Storage Volume = 4,155 cf
Skimmer Size = 2 in
(use 1.5, 2, 2.5, 3, 4, 6, or 8 -inch)
Head on Skimmer = 0.125 ft
Orifice Size = 1.25 in
(1/4 inch increments)
Dewatering Time = 3.26 days
(2-5 days, target 3 days)
Sediment Basin Summary: Basin ID =
BASIN 3B
Bottom Area =
1656 sf
Bottom Length =
NA ft
Surface Area =
2,499.00 sf
Surface Length =
NA ft
Top Width =
N/A ft
Top Length =
N/A ft
Stone Outlet Width =
6 ft
Outlet Sideslopes =
2 :1
Storage Depth =
2 ft
Dam Height =
3.5 ft
Sideslopes =
3 :1
Skimmer Size =
2 in
Head on Skimmer =
0.125 ft
Orifice Size =
1.25 in
Note: All Calculations are based on a 10 year return rainfall and in accordance with
the North Carolina Erosion and Sedimentation Planning and Design Manual.

,"�A
STEWART
Skimmer Sediment Basin Sizing
North Carolina Erosion and Sedimentation Planning and Design Manual
Project Name: Colab
Project #: C16123
Sediment Basin ID: BASIN 3G
Trap Location:
Flow: Disturbed earth =
0.78
@ c=
0.50
Undist., wooded areas =
0.17
@ c=
0.25
Undist., grassy areas =
0.00
@ c=
0.30
Other areas =
0.00
@ c=
0.95
Total Area (ac)
= 0.95 @ c= 0.45
Flow Length
= 320 ft
High Point
= 443 ft
Low Point
= 429 ft
Calculated
Time of Concentration "Tc"
25 -year Intensity =
10 -year Intensity =
Flow "Q10 = CIA"
= 5.00 min (Kirpich Formula)
7.88 in/hr (from local i -d -f curve/table)
7.15 in/hr (from local i -d -f curve/table)
=1 3.08 cfs
Trap Volume: Minimum Required Volume = 1800 cf/acre drainage area per year
Volume Required (cf) = 1,706.24 cf
Minimum Required Surface Area = 435 sf per cfs in 10 year storm
Surface Area Required (sf) = 1340.5099 sf
Shape is assumed to be trapezoidal - excavation may be required
Depth of Basin (ft) _
Sideslopes (h:1) _
Surface Width (ft) _
Surface Length (ft) _
Bottom Width (ft)
Bottom Length (ft)
Bottom Area (sf)
Surface Area (sf)
Volume Provided (cf)
2 ft (from surface - 3.5 ft maximum)
3 :1 (2:1 minimum)
20 ft
40 ft (try to be 2X width)
= 8 ft
= 28 ft
1492 sf
= 2,566.00 sf 1341 OK
= 4,058.00 cf > 1706.24 OK

Stone Required Capacity = Peak Flow from a 25 yr storm event.
Required Capacity (cfs) =
3.08 cfs
Sideslopes (h:1) = 2 :1
Bottom Width (ft) = 6 ft
min = 4ft
Depth of flow (ft) = 0.50 ft
(max. 0.5 ft)
Provided Capacity = 2.56*M*h^2.5+3.09*B*h^1.5
(Trapezoidal Weir)
Spillway Capacity (cfs) =
7.46 cfs OK
Design riser skimmer (Assuming Faircloth Skimmer):
Storage Volume = 4,058 cf
Skimmer Size = 2 in
(use 1.5, 2, 2.5, 3, 4, 6, or 8 -inch)
Head on Skimmer = 0.125 ft
Orifice Size = 1.25 in
(1/4 inch increments)
Dewatering Time = 3.18 days
(2-5 days, target 3 days)
Sediment Basin Summary: Basin ID =
BASIN 3G
Bottom Width =
8 ft
Bottom Length =
28 ft
Surface Width =
20 ft
Surface Length =
40 ft
Top Width =
29 ft
Top Length =
49 ft
Stone Outlet Width =
6 ft
Outlet Sideslopes =
2 :1
Storage Depth =
2 ft
Dam Height =
3.5 ft
Sideslopes =
3 :1
Skimmer Size =
2 in
Head on Skimmer =
0.125 ft
Orifice Size =
1.25 in
Note: All Calculations are based on a 10 year return rainfall and in accordance with
the North Carolina Erosion and Sedimentation Planning and Design Manual.

i
STEWART
RIPRAP OUTLET PROTECTION WORKSHEET
Project NC Agricultural Science Center Date 2018.05.17
Project No. C16123 Designer NBC
Outlet ID DD -03
Outlet flowrate
1 cfs
Pipe diameter
12 inches
Outlet pipe slope
7.8 percent
Full flow velocity
1.3 ft/sec
EQUIVALENT PIPE AREA
Figure 8.06.b.1
25
20
u
15
w
umone
d
10
5 Zan, I
0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above = 2
Outlet pipe diameter
12 in.
Length =
6.0 ft.
Outlet flowrate
1.0 cfs
Width =
3.0 ft.
Outlet velocity
1.3 ft/sec
Stone diameter =
6 in.
Material =
Class B
Thickness =
22 in.
Zone
Material
Diameter Thickness
Length
Width
1
Class A
3
9
4 x D(o)
3 x D(o)
2
Class B
6
22
6 x D(o)
3 x D(o)
3
Class I
13
22
8 x D(o)
3 x D(o)
4
Class I
13
22
8 x D(o)
3 x D(o)
5
Class II
23
27
10 x D(o)
3 x D(o)
6
Class II
23
27
10 x D(o)
3 x D(o)
7
Special study required
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
421 Fayetteville Street, Suite 400, Raleigh, NC 27601 Tel [phone] Fax [phone] www.stewart-eng.com

i
STEWART
RIPRAP OUTLET PROTECTION WORKSHEET
Project NC Agricultural Science Center Date 2018.05.08
Project No. C16123 Designer NBC
Outlet ID DD -04
Outlet flowrate
Pipe diameter
Outlet pipe slope
Full flow velocity
1.99 cfs
12 inches
1.6 percent
2.5 ft/sec
EQUIVALENT PIPE AREA
Figure 8.06.b.1
25
20
u
15
w
u e
d
10
5
Zone0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above = 2
Outlet pipe diameter
12 in.
Length =
6.0 ft.
Outlet flowrate
2.0 cfs
Width =
3.0 ft.
Outlet velocity
2.5 ft/sec
Stone diameter =
6 in.
Material =
Class B
Thickness =
22 in.
Zone
Material
Diameter Thickness
Length
Width
1
Class A
3
9
4 x D(o)
3 x D(o)
2
Class B
6
22
6 x D(o)
3 x D(o)
3
Class I
13
22
8 x D(o)
3 x D(o)
4
Class I
13
22
8 x D(o)
3 x D(o)
5
Class II
23
27
10 x D(o)
3 x D(o)
6
Class II
23
27
10 x D(o)
3 x D(o)
7
Special study required
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
421 Fayetteville Street, Suite 400, Raleigh, NC 27601 Tel [phone] Fax [phone] www.stewart-eng.com

i
STEWART
RIPRAP OUTLET PROTECTION WORKSHEET
Project NC Agricultural Science Center Date 2018.05.08
Project No. C16123 Designer NBC
Outlet ID DD -05
Outlet flowrate
5.15
cfs
Pipe diameter
12
inches
Outlet pipe slope
33
percent
Full flow velocity
6.6
ft/sec
Material =
EQUIVALENT PIPE AREA
Figure 8.06.b.1
25
20
u
15
w
umone
d
10
e
5
0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above = 2
Outlet pipe diameter
12 in.
Length =
6.0 ft.
Outlet flowrate
5.2 cfs
Width =
3.0 ft.
Outlet velocity
6.6 ft/sec
Stone diameter =
6 in.
Material =
Class B
Thickness =
22 in.
Zone
Material
Diameter Thickness
Length
Width
1
Class A
3
9
4 x D(o)
3 x D(o)
2
Class B
6
22
6 x D(o)
3 x D(o)
3
Class I
13
22
8 x D(o)
3 x D(o)
4
Class I
13
22
8 x D(o)
3 x D(o)
5
Class II
23
27
10 x D(o)
3 x D(o)
6
Class II
23
27
10 x D(o)
3 x D(o)
7
Special study required
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
421 Fayetteville Street, Suite 400, Raleigh, NC 27601 Tel [phone] Fax [phone] www.stewart-eng.com

i
STEWART
RIPRAP OUTLET PROTECTION WORKSHEET
Project NC Agricultural Science Center Date 2018.05.08
Project No. C16123 Designer NBC
Outlet ID DD -06
Outlet flowrate
12.08
cfs
Pipe diameter
12
inches
Outlet pipe slope
33
percent
Full flow velocity
15.4
ft/sec
Material =
EQUIVALENT PIPE AREA
Figure 8.06.b.1
25
20
u
15
w
umone
c 10
d
5 Zan, I
0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above = 3
Outlet pipe diameter
12 in.
Length =
8.0 ft.
Outlet flowrate
12.1 cfs
Width =
3.0 ft.
Outlet velocity
15.4 ft/sec
Stone diameter =
13 in.
Material =
Class I
Thickness =
22 in.
Zone
Material
Diameter Thickness
Length
Width
1
Class A
3
9
4 x D(o)
3 x D(o)
2
Class B
6
22
6 x D(o)
3 x D(o)
3
Class I
13
22
8 x D(o)
3 x D(o)
4
Class I
13
22
8 x D(o)
3 x D(o)
5
Class II
23
27
10 x D(o)
3 x D(o)
6
Class II
23
27
10 x D(o)
3 x D(o)
7
Special study required
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
421 Fayetteville Street, Suite 400, Raleigh, NC 27601 Tel [phone] Fax [phone] www.stewart-eng.com

i
STEWART
RIPRAP OUTLET PROTECTION WORKSHEET
Project NC Agricultural Science Center Date 2018.05.08
Project No. C16123 Designer NBC
Outlet ID DD -07
Outlet flowrate
Pipe diameter
Outlet pipe slope
Full flow velocity
11.75 cfs
12 inches
3.6 percent
15.0 ft/sec
EQUIVALENT PIPE AREA
Figure 8.06.b.1
25
20
u
15
w
u e
d
10
5 Zan, I
0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above = 3
Outlet pipe diameter
12 in.
Length =
8.0 ft.
Outlet flowrate
11.8 cfs
Width =
3.0 ft.
Outlet velocity
15.0 ft/sec
Stone diameter =
13 in.
Material =
Class I
Thickness =
22 in.
Zone
Material
Diameter Thickness
Length
Width
1
Class A
3
9
4 x D(o)
3 x D(o)
2
Class B
6
22
6 x D(o)
3 x D(o)
3
Class I
13
22
8 x D(o)
3 x D(o)
4
Class I
13
22
8 x D(o)
3 x D(o)
5
Class II
23
27
10 x D(o)
3 x D(o)
6
Class II
23
27
10 x D(o)
3 x D(o)
7
Special study required
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
421 Fayetteville Street, Suite 400, Raleigh, NC 27601 Tel [phone] Fax [phone] www.stewart-eng.com

i
STEWART
RIPRAP OUTLET PROTECTION WORKSHEET
Project NC Agricultural Science Center Date 2018.05.08
Project No. C16123 Designer NBC
Outlet ID DD -09b
Outlet flowrate
2.58
cfs
Pipe diameter
12
inches
Outlet pipe slope
4.7
percent
Full flow velocity
3.3
ft/sec
Material =
EQUIVALENT PIPE AREA
Figure 8.06.b.1
25
20
u
15
w
umone
d
10
5 Zan, I
Zone0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above = 2
Outlet pipe diameter
12 in.
Length =
6.0 ft.
Outlet flowrate
2.6 cfs
Width =
3.0 ft.
Outlet velocity
3.3 ft/sec
Stone diameter =
6 in.
Material =
Class B
Thickness =
22 in.
Zone
Material
Diameter Thickness
Length
Width
1
Class A
3
9
4 x D(o)
3 x D(o)
2
Class B
6
22
6 x D(o)
3 x D(o)
3
Class I
13
22
8 x D(o)
3 x D(o)
4
Class I
13
22
8 x D(o)
3 x D(o)
5
Class II
23
27
10 x D(o)
3 x D(o)
6
Class II
23
27
10 x D(o)
3 x D(o)
7
Special study required
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
421 Fayetteville Street, Suite 400, Raleigh, NC 27601 Tel [phone] Fax [phone] www.stewart-eng.com

i
STEWART
RIPRAP OUTLET PROTECTION WORKSHEET
Project NC Agricultural Science Center Date 2018.05.08
Project No. C16123 Designer NBC
Outlet ID DD -13
Outlet flowrate
2.92
cfs
Pipe diameter
12
inches
Outlet pipe slope
1.3
percent
Full flow velocity
3.7
ft/sec
Material =
EQUIVALENT PIPE AREA
Figure 8.06.b.1
25
20
u
15
w
umone
d
10
5 Zan
se
Zone 7
0 - A
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above = 2
Outlet pipe diameter
12 in.
Length =
6.0 ft.
Outlet flowrate
2.9 cfs
Width =
3.0 ft.
Outlet velocity
3.7 ft/sec
Stone diameter =
6 in.
Material =
Class B
Thickness =
22 in.
Zone
Material
Diameter Thickness
Length
Width
1
Class A
3
9
4 x D(o)
3 x D(o)
2
Class B
6
22
6 x D(o)
3 x D(o)
3
Class I
13
22
8 x D(o)
3 x D(o)
4
Class I
13
22
8 x D(o)
3 x D(o)
5
Class II
23
27
10 x D(o)
3 x D(o)
6
Class II
23
27
10 x D(o)
3 x D(o)
7
Special study required
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
421 Fayetteville Street, Suite 400, Raleigh, NC 27601 Tel [phone] Fax [phone] www.stewart-eng.com

i
STEWART
RIPRAP OUTLET PROTECTION WORKSHEET
Project NC Agricultural Science Center Date 2018.05.08
Project No. C16123 Designer NBC
Outlet ID DD -19
Outlet flowrate
1.24
cfs
Pipe diameter
12
inches
Outlet pipe slope
3.3
percent
Full flow velocity
1.6
ft/sec
Material =
EQUIVALENT PIPE AREA
Figure 8.06.b.1
25
20
v
15
w
.v 6110
10
d
- 1
5
se
0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above = 2
Outlet pipe diameter
12 in.
Length =
6.0 ft.
Outlet flowrate
1.2 cfs
Width =
3.0 ft.
Outlet velocity
1.6 ft/sec
Stone diameter =
6 in.
Material =
Class B
Thickness =
22 in.
Zone
Material
Diameter Thickness
Length
Width
1
Class A
3
9
4 x D(o)
3 x D(o)
2
Class B
6
22
6 x D(o)
3 x D(o)
3
Class I
13
22
8 x D(o)
3 x D(o)
4
Class I
13
22
8 x D(o)
3 x D(o)
5
Class II
23
27
10 x D(o)
3 x D(o)
6
Class II
23
27
10 x D(o)
3 x D(o)
7
Special study required
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
421 Fayetteville Street, Suite 400, Raleigh, NC 27601 Tel [phone] Fax [phone] www.stewart-eng.com

Page 1 of 1
RATIONAL METHOD/PIPE SIZING TABLE
SLOPE DRAIN SIZING
STEWART--
Project:North Carolina Agricultural Science Center
DATE:
May 8, 2018
n =
0.012
Project No.: C16123
BY:
NBC
9 =
195
h =
22
10 YEAR STORM
A
tc
I
WEIGHTED
WEIGHTED
Q
INLET
TOTAL INLET
PIPE
TIME OF
INTENSTY
Cc
Cc
FLOW
SLOPE Dtheo
SIZE
TO
AREA
AREA TIME
TIME
CONC.
INLET
TOTAL
AREA
AREA
ac
ac min
min
min
in/hr)
(cfs)
(ft/ft in
in
SD 01
0.009
0.009 5
0.00
5.00
7.22
0.50
0.50
0.03
0.3300 1.0
12
SD 02
0.012
0.012 5
0.00
5.00
7.22
0.50
0.50
0.04
0.3300 1.2
12
SD 03
0.010
0.010 5
0.00
5.00
7.22
0.50
0.50
0.03
0.3300 1.1
12
SD 05
1.430
1.430 5
0.00
5.00
7.22
0.50
0.50
5.16
0.3300 6.9
12
SD 06
3.350
3.350 5
0.00
5.00
7.22
0.50
0.50
12.10
0.3300 9.6
12
SD 10*
0.014
0.014 5
0.00
5.00
7.22
0.50
0.50
0.05
0.3300 1.2
12
Page 1 of 1

Appendix 6
Stormwater 10 -year HGLs
Stormwater 25 -year HGLs

10 YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER
S T E W A R T
i
m
L420 ------ _------- _______i____________�______-------- I ------ .______:------- .______ ______ ______
w
418 ____.y;
o v
______ Oink ID channel_norfh
0
------
_______
414 ____
Dia 214 00 in 4 0
412 ____z �______ _______f '' ."f _____--------------- _--------------- _--------------- r______ ___--------------- _------ _______ _______________
i �o � Slope O-ki289 itift�______ ______� _ ��____ _� ______� __;________1______3_______f______�__________
" . :Up lnverj 46650 fF '� 8 -----
N
410
n nve
468____________________________,_______.______�_______.______, ----
-------------- ______________ ______________ ______ _______ ______ _______ ______ _______ ______ -------
___o4406 -----
404
64 _____ ______;_____________;_____________;_______------ ;------- _______;______{_______;______;_______ ______ _______ ______ ______________ ______________ ______ _______ ______ _______ ______ _______ ______ ______ ______ -------
402 ------ _------- ------- _---------------- _---------------------- _------------------------ ----------------------- .--------------- .------ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ____ ___ ___ ___ ___ -------
466 _______------- ------- .------ ._______.------ ._______ L ------ .-------- .--------------- --------------- _______------ ___
1+00 1+20 1+40 1+60 1+80 2+00 2+20 2+40 2+60 2+80 3+00 3+20 3+40 3+60 3+80 4+00 4+20 4+40 4+60 4+80 5+00 5+20 5+40 5+60 5+80 6+00 6+20 6+40 6+60 6+80 7+00 7+20 7+40
Station [ft]
Node ID:
Rim [It]:
Invert [It]:
Min Pipe Cover (it):
Max HGL (it):
Link ID.
Length (it):
Dia (in):
Slope [R/R]:
Up Invert [R]:
Din Invert [R]:
Max 4 (cfs):
Max Vel [ft/s)
Max Depth (ft):
ost-North-C utfall
Channel_ convergence
01-H W
02J D
10 -year HGL
410.00
428.03
Nodh Carolina Agricultural Sciences Center
435.00
403.00
w
444
------ _------- ------- .------- ------- .------- -------------- .------- -------- ------- -------- -------------- .------- ------- .------ . ------- -------
.------- _______._____
____ __ __
___ ___
_ __ __ __ _ __ __
___ ___ ___
_ _ __ __ _ __ __ ____
____ ___ ___ ___
442
_.------- ------- _------ _________------ ________,.------ .,-------- .--------------- _______;______,_______ L ______ _______ L ______ I _______ L ______
I ------- ----------------
_______ ______
_______,______,_______
______ _______ ______ _______�,
403.82
407.35
422.43
w
440
_ __ _______i______--- ____________ -_ ________________--------------- _-------------- _--------------- ________________------
_______--- _____________
--- _______---------------
_---------------
_------ _______________________________
-di
436
- -------- '------'-------'--------- -- -------�------ : ------ ------- T ------------- ---- --- - - - - -- ------ - - - - - -- r ------
-------- -
- - - -- T -------------- r ------
------- r - - - - - - -------r
Uni,ID past We -cII --------------p'--
_ _
436
________
______________ ______
_____ _ ------------
Lehgfh 146A0 ft
______ _ T47.0]: ______ ______________
is in
_ _
"
434
_____ - ------- .------ _____________--_______, ------------------------
24.00
'
Slope 0.6467 Rift. ------
0.0285
0.0639
0.0102
P
Up Ihvert 42S 12 ft
406.50
432
_ ______________________�______ ,_______�______,______ ,_______,______ _______,______�_______,______ _______ ______;.�
;;_______�______ ,, C
&_C ,____L
,o „
- - PD__
,�{StaPrp Pf6pj09 PI
____�
C ___�_______�___Dl11jLvt
42 __ ------- -------
____
Link ID p1-chann(l
'z a
ngf '11242
w
12.39
436
--
- '--------'------•-------•------•-------�'--------•------'-------'-------;--CenW243-pjj{f------',------- ------;--- --'------
------------------Dia
14-66 in -- ---
- --------
-- - ------
---- --- --- -
- -- -- - -- --
----
428
I ---1)n24
_____------- _______ _____________._ .00 in; ;
_ _ _______________________________ _______�______._ .______�_______.______, _______�______
-----'--------
-acre
; ;
; Slope
____ _
_ _ __ __
_ ___
___
-------
I I I I Slope p.0639 ftRft
; Up Inver? 423.18 H
I
I
426
_____
_____', _ I_IJP-Invest9229H__ ___
_ ______ �_______f______ �_______�______ �______________________�_______________ _ ____________________ _ _________
___________
22 ____________
IDn lnvEti4 916
____
_ _
_________________ �_______________
Dn Invert 406.50tt
a424
------ _------- ------- _------ ________------ 4-______- ------ ,-------- ------- ,-------- --------------- -
422
------ _------- ------- _------ _________------ _------ ------ _------- _-------------- _-------- ------ _------- _------- ____________ __
_________
______________ ______
_______ L ______ _______
______ _______ ______ _______�_______
_______
i
m
L420 ------ _------- _______i____________�______-------- I ------ .______:------- .______ ______ ______
w
418 ____.y;
o v
______ Oink ID channel_norfh
0
------
_______
414 ____
Dia 214 00 in 4 0
412 ____z �______ _______f '' ."f _____--------------- _--------------- _--------------- r______ ___--------------- _------ _______ _______________
i �o � Slope O-ki289 itift�______ ______� _ ��____ _� ______� __;________1______3_______f______�__________
" . :Up lnverj 46650 fF '� 8 -----
N
410
n nve
468____________________________,_______.______�_______.______, ----
-------------- ______________ ______________ ______ _______ ______ _______ ______ _______ ______ -------
___o4406 -----
404
64 _____ ______;_____________;_____________;_______------ ;------- _______;______{_______;______;_______ ______ _______ ______ ______________ ______________ ______ _______ ______ _______ ______ _______ ______ ______ ______ -------
402 ------ _------- ------- _---------------- _---------------------- _------------------------ ----------------------- .--------------- .------ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ____ ___ ___ ___ ___ -------
466 _______------- ------- .------ ._______.------ ._______ L ------ .-------- .--------------- --------------- _______------ ___
1+00 1+20 1+40 1+60 1+80 2+00 2+20 2+40 2+60 2+80 3+00 3+20 3+40 3+60 3+80 4+00 4+20 4+40 4+60 4+80 5+00 5+20 5+40 5+60 5+80 6+00 6+20 6+40 6+60 6+80 7+00 7+20 7+40
Station [ft]
Node ID:
Rim [It]:
Invert [It]:
Min Pipe Cover (it):
Max HGL (it):
Link ID.
Length (it):
Dia (in):
Slope [R/R]:
Up Invert [R]:
Din Invert [R]:
Max 4 (cfs):
Max Vel [ft/s)
Max Depth (ft):
ost-North-C utfall
Channel_ convergence
01-H W
02J D
410.00
428.03
428.01
435.00
403.00
406.50
422.03
423.18
429.12
1.50
4.00
2.83
403.82
407.35
422.43
424.59
429.87
channel north
01 -channel
{Storm Prop) 02 -PIPE
post_west offsite
123.00
243.00
112.42
146.00
24.00
24.00
24.00
24.00
0.0285
0.0639
0.0102
0.0407
406.50
422.03
423.18
429.12
403.00
406.50
422.03
423.18
62.76
12.39
12.44
12.04
5.25
3.55
9.00
7.00
0.83
0.61
0.89
1.07

10 YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER
10 -year HGL
Neill- Carolina Agricullural Sciences Center
STEWART
426 ------ _-------- _------- _------- ______ ,--------,_______--_______,------- ._______,_______._______--_______--______,------- ,---------------- _;------ .---------------- ._______ _______ ______________ _______ I _______ __w.---- _______ I -------
425 ------ _------- �------- ;------- ------- -------- ------- _______; ;______________ _______ ------- -------
------- ------- _______ _______ _______ _______ ------ ___ _______
m
a;w �
424 � -� � � 4 __�'____ _______ _ _____
i_______ _______ _______ ______________
423 - - - - - �__________________----
_--------- _______________________________________�_------ _------- _-----
_
I °
I I
422______ _______ _______ _ ----------------- _______ _______ ______________ _______ _______ _______ _______ _____
Dia;42 00 in
421 -----------------i-------`------i-------i-------i--------------i-------i-------`----------------------------- ----------- -------------------------------------------------------------------------- - ----
_ ; ; � _ _ _ _ � ; ; ; ; ; ; ; U Jneer3A1&50�tt � a
--- Dn n 6.50;ft
420 ______; ;_______;________________________________ _______ _______ - _______ _______ _______ ______________ _______ _______ _______ ______ ___
Link
419 ------ _-------- i ------- i------- I ------- -------- ---------------- ---------------- _______i------------ ------------------ ______________ _______ _______ ___ ___ opj._ _______ _______ _______ ______
Length 10.98 ft
418 ______________________________' ______ ;_______;_______,_______;_______J_______j_______', _________ ____; ______ ;______________;_______;_ __;_______;_______ _______ ____ 3u Rm Os _ _______ _______ _______ ______ ___
--Sktpe 0.027.4 Riff
n '_ 417 -------------- `_______'--------------- __ "'___ �_______-_ _____________'_______•_____ ----------------------- ------- _______'_______'_ __•_______•_______'_____----L¢ilnv - ____ ___ ___ ____ -
vul;u o Dq Invert 41 P.60 ft
°"^
0 416 ____ m ______, _____________________________ jSto'L -Prop4 O=P_____--______ ;_ ____ _______ _______ ____ ____ _____ _______
v" Length 124.12 ft -----
____5._______ aN "___ -_______�_____________ _______ ___ A218 h _______--- ______,___._______._______.______________�______ -_______� _____ ------- ________
w 415 _ o ._______i_____________- - Pe 4 OO u> _______i ______ '_______�I
So
414 ----- '_______-_______` _______________ _______________________
I' N ______a -a _5___ ----- Inert 410-00; k______________
�� D rt 407 70.h
v. H
�
413 _____ u_n____________________ ------------------_ ._______. --------------- _______ _______ _______ _ ______ _______ _______ ' I ; ______., ; ; ______, ;_______ ________
Link ID 1P-riprap; ; ; ; ;
412 - o �° ____ _______ _______ _______ ________
---v �-o----`_Leng[h $P.QQ ft -F ---------'-------'-------1-------'-------'-------F-------`------- L
a o
a Dia 24.00 in '
411 ____ � o_u___451ope �_____ ____ _______ _______ _______ _______ _______ _______ ________
vert:407.60 ftI
410 ---- ° -'� ---.,Do Jnveriv10C50ftt_____
409 '
408 ____________'------- '_______'_______`_______`_______`_____________'_______'_______•_______•_______'_______`_______`_____ ____ ____ ___ ___ ___ ___ ___ ____
407 _____ ---
I-------- ---_______ _______ _______ _______,_______ _______ _______ _______ ______________ _______ _______ _______ _______ _______
406_____________________________________,_______,_______,_______._______._______._______._______, _______, ______ �_______,______ ____ ______ ____ ____ ____ ____ ___ ___ ___-------
----------------___ ____
405 ______ _______--------------- s-------------------------------- _______________ ____________________________________----------------------- _______ -------- -------- _-------- _--------------- _ _
1+00 1+10 1+20 1+30 1+40 1+50 1+60 1+70 1+80 1+90 2+00 2+10 2+20 2+30 2+40 2+50 2+60 2+70 2+80 2+90 3+00 3+10 3+20 3+30 3+40 3+50 3+60 3+70 3+80 3+90 4+00
Station (ft)
Node ID:
Rim (It):
Invert (It):
Min Pipe Cover (it):
Max HGL (it):
Link ID.
Length (it):
Dia (in):
Slope (Itllt):
Up Invert [It]:
Dn Invert [It]:
Max 4 (cfs):
Max Vel [ft/s)
Max Depth (R).
10 -HW
11 JB
12RI
BACKBIO
410.00
412.00
421.95
421.00
419.00
406.50
407.50
410.40
413.50
415.50
1.50
1.80
8.85
0.00
407.35
408.49
412.77
415.71
417.40
10-riprap
(Storm Pmp).10-P
{Storm-Prop).11 P
RIM
40.00
124.12
105.98
24.00
30.00
30.00
42.00
0.0250
0.0218
0.0274
407.50
410.40
413.50
416.50
406.50
407.70
410.60
416.50
47.28
47.28
47.30
34.15
6.24
11.23
10.57
0.00
0.92
2.02
1 2.19
0.00

10 YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER
4285
428
4275
427
4265
426
4255
425
424.5
424
423.5
423
422.5
422
421.5
L 421
420.5
420
419.5
419
418.5
418
417.5
417
416.5
416
415.5
415
414.5
Node ID:
Pim (fl):
In 0 (fl):
Min Pipe Cover III):
Mae HGL III):
Link ID:
Length �fi):
Dia (in):
Slope (fVfl):
Up Inver) III):
Dn Invert III):
Max 4 (cfs):
Mae Vel (fVs):
Max Depth III).
10 -year HGL
North Carolina Agricultural Sciences Center
S T E W A R T
q1N
--------- __________ __________
__________ p
a° a
------------------ __________ __________ __________�__________ __________ __________�__________�_________ ______ _______ _______ ______ _______ ______ Link ID 15t5rm-Plop _________ _____ __
Lengt� 192.17 ft
_______W__, ________mj 1890 RS ___ _______ _ __________ _________ ____
- " " Up Invert �. 0 f
w
- r m
--------+'------ N m .� -------- - -- ----
o o Link lD SYorm-Pro 23-P H
1-- - - - - -
p N y
p}. _____________________ �, � iengtH 1-04,59ft
v
v _ a ° Dia 30.00 in 'e a P
_______________ V. 8_D ____�__________�______ o r. _q__;__________;__
a 1pope O.00YBft__- ------
H
._______,_ ________, ,� imrett 47 75ft_____,__ __ __________ _
_________i__________ LeDie °y0001in�___� Din Invert 41 93k
_____
Slope LY.0100 ftnt
nve - -
59-f1
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1+00 1+20 1+40 1+60 1+80 2+00 2+20 2+40 2+60 2+80 3+00 3+20 3+40 3+60 3+80 4+00 4+20 4+40 4+60 4+80 5+00 5+20
Station (ft)
DACK010 21 -AD 22 AD
23 -AD
419.00 420.33 420.39
425.72
415.50 416.73 417.75
421.00
417.40 418.64 419.65
421.45
(Storm-Prop}.20-P
{Storm-Prop}.23-P
{Storm-Prop).24 P
123.10
104.59
192.17
30.00
30.00
18.00
0.0100
0.0078
0.0156
416.73
417.75
421.00
415.50
416.93
418.00
28.96
25.00
2.55
7.09
6.07
2.87
1.90
1.80
0.97

10 YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER S T E W A R T
11 HG
North Carolina Agricultural Sciences Center
0+90 1+00 1+10 1+20 1+30 1+40 1+50 1+60 1+70 1+80 1+90 2+00 2+10 2+20 2+30 2+40 2+50 2+60 2+70 2+80 2+90 3+00 3+10 3+20 3+30 3+40 3+50 3+60 3+70 3+80 3+90 4+00 4+10 4+20 4+30 4+40 4+50 4+60
Station (Its
Node ID:
Pim (ft]:
Invert (ft]:
Min Pipe Cover (ft):
Mae Hi (ft):
Link ID:
Length eft]:
Dia (in):
Slope (fVFl]:
Up Invert (ft]:
Dn Invert (ft]:
Max 4 (cfs]:
Mae Vel JUV
Max Depth (ft]:
22 -AD 24 -AD
25 -AD 26 -CD
27 -JD
420.39 421.33
426.00 427.20
6
430.5-
------ _______------ _------ ------
______I_____.______I_____,______,
____________ ------ ------ .------ ______ _____
______
_____,______ _____ ______ _____ _____
- ______ _____ ------ , _____._______
430
421.99 423.99
____________________________________________________________________________________
(Storm-Prop}.25-P
(Storm-Prop}.26-P
_
_
___________________________________a
vt
429.5
64.61
72.25
24.00
__
w
_____ ______ _____ ______ _____ _ _
�
_____ ______ _____ ______, _____,_________
� °d v"
o
d S
429
______ ____________ ____________
_____ ______ _____ ______ _____ ______ _____ ______ _____
L L
______ _____ ____________ _________________________ ____
,_
W ----------
------ ._____.______-_____, w
M_ _____ ______ _____ ______------ .________�
417.95
428.5
�__ �__
`_ ` �__ �__ �__
---------------------x-
__ __
12.50
o
C
428
;- --
--------------
1.37
______ _____ ______ _____ z
a w_____ ______ _____ ------ ------ __ ___
----
427.5
'______•___________•___________'_____'______`_____'______`_____'______`_____'_
__ __ __ __ __ __ __ __ --
--- -
__ __ _
-- -- --------__ -
__ __ __ __ __ __ -
__
427
'______�_____ �______�_____ �______�_____
-______�_____-___________-________________________________________________________________
T_________________
_ _ _______
C
Lir 1k ID jWrm Prokjt 27 P
_
Lini {Storm Prop},28 P
________________ ______________ _________
____
Length 64.
Length .25 fl
426.5
;______;_____ ;______;_____;______;_____;______;_____;___________________
_____ ______ _____
______ _____ ____________ _________________________ _____
______
___ __ .00 m;______�____
_ _____ ______,_pia9S.BBin '�______;_____ ;___
____
426
'------ '_____ '______'_____'______`_____'______`_____'______`_____'______`_____.'____
__
_ __
__ __ _ __ __ ____ __ __ ____ __ __ ____ __ ____
__ __ __ __ __ __ __ __ _
_
__ _StoRa0P255-Hdl____`___
____
Up InvaN 423.Ob N
___ _ 5-oi D 0100 n�----- .------ ___
____ ft
InvM 423 821
____
425.5
;___________------ ------- ------
�_____�______�_____�_______ ___ _____ ______
____
n __ _ ____ _____ _
�b fnv�ri 421 .�� ft
____ i ________
�n LZ3T0'Yt
____
425
r____ __r
�_ , ___� ;_____ ,____ - ----
Link ID {Storm Prop} 26 P
_ _ ____ ___ ____
_
_ _ ___
____
1------
a424.5
'______•_____'______•_____'______•_____'______•_____'______•_____•______'___
__--
----------------- - __ __ __
Q
__
__ _
__------
_
o 424______,___
w__; _____i
__ ______ _____ ______ _____ ______ _____r" _____ _____
--------------------------
a m
Slope
______ _____; slope 018s_-----
__________.____________ ____
IUp lnvdrt . 8ft
____
_____ ______
1
____
423.5
__ -__i _____ _____i
_____'
,Nm
___ ra _____ _____
-�
______ ____ _____ _____;____
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0+90 1+00 1+10 1+20 1+30 1+40 1+50 1+60 1+70 1+80 1+90 2+00 2+10 2+20 2+30 2+40 2+50 2+60 2+70 2+80 2+90 3+00 3+10 3+20 3+30 3+40 3+50 3+60 3+70 3+80 3+90 4+00 4+10 4+20 4+30 4+40 4+50 4+60
Station (Its
Node ID:
Pim (ft]:
Invert (ft]:
Min Pipe Cover (ft):
Mae Hi (ft):
Link ID:
Length eft]:
Dia (in):
Slope (fVFl]:
Up Invert (ft]:
Dn Invert (ft]:
Max 4 (cfs]:
Mae Vel JUV
Max Depth (ft]:
22 -AD 24 -AD
25 -AD 26 -CD
27 -JD
420.39 421.33
426.00 427.20
428.09
417.75 418.75
421.08 422.99
423.82
419.65 420.78
421.99 423.99
424.26
(Storm-Prop}.25-P
(Storm-Prop}.26-P
{Storm-Prop}.27-P
(Storm-Prop}.2&P
104.85
115.42
64.61
72.25
24.00
24.00
24.00
15.00
0.0076
0.0185
0.2266
0.0100
418.75
421.08
423.00
423.82
417.95
418.95
421.28
423.10
18.60
12.50
12.33
1.76
5.99
5.31
8.92
2.63
1.85
1.37
0.88
0.67

10 YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER S T E W A R T
10 -year HGL
Nodh Carolina Agrieullural Sciences Center
Node ID:
Rim (fl]:
Inved (fl]:
Min Pipe Cover Ili):
Mae HGL Ili):
Link ID.
Length Ili):
Dia [in]:
Slope (ft/fl]:
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Dn Inved Ili):
Max 4 [ofsj:
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Max Depth (fl):
1+00 1+05 1+10 1+15 1+20 1+25 1+30 1+35 1+40 1+45 1+50 1+55 1+60 1+65 1+70 1+75 1+80 1+85 1+90 1+95 2+00 2+05 2+10 2+15 2+20 2+25 2+30
Station (It)
26 -CB
______________ ________ ________.________.________; -------- .------------------ ________________._____--- .-------- .-------- .-------- .----------------- ;---------- w________.________._______.______�.
427.20
433.5
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433
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424.20
425.50
426.20
9.85
3.87
1.60
6.69
3.54
4.02
0.93
0.78
0.41
431
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Node ID:
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Inved (fl]:
Min Pipe Cover Ili):
Mae HGL Ili):
Link ID.
Length Ili):
Dia [in]:
Slope (ft/fl]:
Up Inved Ili):
Dn Inved Ili):
Max 4 [ofsj:
M ae Vel JUt j:
Max Depth (fl):
1+00 1+05 1+10 1+15 1+20 1+25 1+30 1+35 1+40 1+45 1+50 1+55 1+60 1+65 1+70 1+75 1+80 1+85 1+90 1+95 2+00 2+05 2+10 2+15 2+20 2+25 2+30
Station (It)
26 -CB
20 AD 30 CB 31 -CB
427.20
429.00 431.51
431.50
422.99
425.30 425.80 426.50
423.99
426.31 426.54 426.95
{Storm-Prop}.29-P
{Storm ProP}.30-P
31-P
86.66
19.63
23.91
24.00
24.00
18.00
0.0127
0.0153
0.0125
425.30
425.80
426.50
424.20
425.50
426.20
9.85
3.87
1.60
6.69
3.54
4.02
0.93
0.78
0.41

10 YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER
441
440.5
440
439.5
439
438.5
438
437.5
437
436.5
436
435.5
435
434.5
434
a 433.5
E 433
'm 432.5
u 432
431.5
431
430.5
430
429.5
429
428.5
428
427.5
427
426.5
426
425.5
425
Node ID:
Pim (ft]:
Invert (ft]:
Min Pipe Cover (fi):
Mae Hi (fi):
Link ID.
Length (fi):
Dia (in):
Slope (fVfl]:
Up Invert (ft]:
Dn Invert (ft]:
Max 4 (cfsj:
Mae Vel [RIs]:
Max Depth (R):
11 HG
North Carolina Agricultural Sciences Center
S T E W A R T
��
_____________�------- `_____------- `______'______'_______`_____,______ _______`_____,____ - _______ ______ ______ ______--- ___ __
n orm- rop
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2
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1+00 1+05 1+10 1+15 1+20 1+25 1+30 1+35 1+40 1+45 1+50 1+55 1+60 1+65 1+70 1+75 1+80 1+85 1+90 1+95 2+00 2+05 2+10 2+15 2+20 2+25 2+30 2+35 2+40 2+45 2+50 2+55 2+60
Station (Its
30 -CB 32 -CD 33 -CB
431.51 437.83 437.83
425.80 433.60 434.00
426.54 433.92 434.33
(Storm-Prop}.32-P
(Storm Prop) 33-P
133.46
24.63
15.00
15.00
0.0517
0.0162
433.40
434.00
426.50
433.60
2.00
0.89
8.18
3.53
0.31
0.32

10 YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER
447
446.8
446.6
4464
446.2
446
445.8
445.6
445.4
445.2
445
4448
444.6
444.4
4442
444
443.8
443 6
443.4
443.2
443
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442.6
442.4
442.2
442
441.8
441.6
441 4
441.2
441
4408
440.6
440.4
4402
440
439.8
439.6
Node ID:
Rim (fl]:
I nverl (fl]:
Min Pipe Cover (fl):
Mae HGL (fl):
Link ID.
Length (fl):
Dia (in):
Slope (fVfl]:
Up Invert (fl]:
Dn Invert (fl]:
Max 4 (cfs]:
Mae Vel JUV
Max Depth (fl]:
16 -year HGL
North Carolina Agricultural Sciences Center
S T E W A R T
_________.________:_ 1111___ _________ _________--------
-------------------
_________ _________
_ ________ ______________________.---------- I -------- ,_-4, ______ _________ __------- --------- --------- --------- --------- -------- ------------------- --------- --------
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40.36 k
1111 q,ga�14�� k_. _. ________ ,_________I_________ -------- _--------- __ 1111__ ________ ____________
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1+00 1+10 1+20 1+30 1+40 1+50 1+60 1+70 1+80 1+90 2+00 2+10 2+20 2+30 2+40 2+50 2+60 2+70 2+80 2+90 3+00 3+10 3+20 3+30 3+40
Station (It)
34 HW
35JB
36 AD
37 -CB
38 -CB
6.00
6.00
445.00
445.25
445.45
440.00
440.16
441.05
441.50
443.01
0.00
0.00
440.30
441.55
441.69
442.14
443.50
35-p
36-p
37 p
38-p
14.00
69.47
21.70
131.55
15.00
15.00
15.00
15.00
0.0100
0.0099
0.0115
0.0100
440.16
441.05
441.50
443.01
440.02
440.36
441.25
441.70
5.53
2.58
2.28
1.69
4.83
2.91
3.99
3.85
1.10
0.91
0.58
0.48

10 YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER S T E W A R T
11 HG
North Carolina Agricullural Sciences Center
427
------ :----------- : :___________: . _____________-----------------------. .-___________-__�
426.5
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426
------------------- _----------- _----------- _____________----------- ____________
__________ ___________
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425.5
425.5
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425
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424.5
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417.40
Length 64;71 H
______i___________i______________________i___________.___________i___________�_ o ___ .___________.___________.___________'
__________________________ _ _ ____
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423
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422.5
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420.00
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419.5
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6.41
419
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4185
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8.38
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417.5
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417
416.5
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4156
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1+00 1,06 1+10 1+15 1+20 1+25 1+30 1+35 1+40 1+45
1+50 1+55 1+60 1+65 1+70 1+75 1+80 1+85 1+90 1+95
Station (Its
Node ID:
Pim (fl]:
Invert (fl]:
Min Pipe Cover (fl):
Mae Hi (fl):
Link ID.
Length (fl):
Dia (in):
Slope (fVfl]:
Up Invert (fl):
Dn Invert (fl):
Max 4 (cfsj:
Mae Vel JUVj
Max Depth (II):
DACKDID
41 JB
44 -CB
419.00
422.30
424.68
415.50
416.30
421.00
1.05
417.40
418.00
421.40
Link -08
44-p
31.73
64.71
30.00
15.00
0.0095
0.0155
416.30
421.00
416.00
420.00
19.29
1.32
6.41
4.13
1.52
8.38

10 YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER S T E W A R T
11 HG
North Carolina Agricultural Sciences Center w
429 ______________------ }------- ;------- ------ }------- ;------- _______;_______,______ ______;_______ ______ _______ _______ ______ _______ _______ ______ _______ ______________ _______ ______________ _______ ______________ _______ ______ _
428.5______•_______•______'_______•_______•______� ______• ___ ___ ___ ____ ___ ___ ____ --- --- ----------- ---- --- --- --- --- ---- -
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428 -------- --------------- _______-------------- ______ ------- --------------- _------- _-------------- _------- _------------------------ _-------------------------------- _------- _------------------------ _--------------- _------- ________
427.5_______ _______ ______________ _______ ______ 1°
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427 ______________ ______ ______________________------- _------- ------- _------- _------- ------- _-------- _------ ------- .----------------------------------------------------------- ___ ___ ___ ____ ___ ___ ___ ___ ____
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425 ---__ _____�______}_______________�_� ______;______ ;_______;_____________ ;_____ _______ ______________ _______ ______
4245 ____ n_�_________________------- ------ ------- _------- ------- _------- _------- ------- _------- _------ ------- _------- �------ .-------------------- o g c ______._______I_______._______' {$'tormFrolu}22B__.______ -_______ _______ ______
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424 ____� ____ _______ _____ __ _______ ______________ ______
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419
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418 ---------- `------ '------- ________`------ 1------- `------- ------- F------- ------- ,_____--`------ _______ __----_ ---___ ------_ ______ --------------- ------- --------______------- ------- ------- _-----_------- ------ ------_ -
4175 ___________ -_______; ___ _______ _______ ______ _______ _______ ______ _______ ______________ _______ ______________ _______ ______________ _______ ______ ___ _
417 ----- ----- •------ '------- •------- •_--_____•___________________________ ______ _______ _______ ______ ______________ ______ __________________________________________ _______ _____________________-
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416.5 ______________________________________-_______- ______ _________________________________________________________________________--- ______________________
---------------- _------------------------ _------------
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1+00 1+05 1+10 1+15 1+20 1+25 1+30 1+35 1+40 1+45 1+50 1+55 1+60 1+65 1+70 1+75 1+80 1+85 1+90 1+95 2+00 2+05 2+10 2+15 2+20 2+25 2+30 2+35 2+40 2+45 2+50 2+55
Station (Its
Node ID:
Pim (ft]:
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Min Pipe Cover (fi):
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Link ID.
Length (fi):
Dia (in):
Slope (fVfl]:
Up Invert (ft]:
Dn Invert (ft]:
Max 4 (cfsj:
Mae Vel JUVj
Max Depth (fl):
41 J B
42 CB
43 -CB
422.30
423.33
426.41
416.30
419.85
421.21
1.05
418.00
420.31
421.48
Link 09
{Storm-Prop}.22.P
92.99
58.22
18.00
15.00
0.0123
0.0234
419.85
421.21
418.71
419.85
1.83
0.97
4.12
3.32
0.45
0.36

10 YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER
431
430.5
430
429.5
429
4285
428
427.5
427
426.5
426
425.5
425
424.5
424
0 4235
423
w 422.5
422
421.5
421
420.5
420
419.5
419
4185
418
4175
417
416.5
416
415.5
Node ID:
Pim (fl]:
Invert (fl]:
Min Pipe Cover (fl):
Mae Hi (fl):
Link ID.
Length (fl):
Dia (in):
Slope (fVfl]:
Up Invert (fl):
Dn Invert (fl):
Max 4 (cfsj:
Mae Vel JUVj
Max Depth (II):
S T E W A R T
11 HG
Neill- Carolina Agricultural Sciences Center w
______ _______ _______ I _______ _______ _______ i _______ L _______ ______ _______ _______ 1 _______ L ------- ---------------- _______ _______ ______________ _______ 1 _______ L ______________ _______ _______ L _______ L ---
L
__
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d h ------- _-------- -------- _-------- _--------------
aH _______�____________________
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424.00
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424.12 424.13
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423.87
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15.00
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0.0102
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r
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423.87
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418.93
________________-----------
______________
_________ __---------------------------
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8.25
1+00 1+10 1+20 1+30 1+40 1+50 1+60 1+70 1+80 1+90 2+00 2+10 2+20 2+30 2+40 2+50 2+60 2+70 2+80 2+90 3+00 3+10 3+20 3+30 3+40 3+50 3+60 3+70 3+80 3+90 4+00
Station (Its
41 JB
d h ------- _-------- -------- _-------- _--------------
aH _______�____________________
____________________________________________
.------- ______,_______ _______ ______________ ______
----- _------- _-------------- ----- _------- _-----------------------
_____,_______ _____________ _____ _______, ____________
_ ___________
424.00
______ - , ______
424.12 424.13
,_______-------
LinKiDjSYorrh Prop}.4--
`
______
______ ____ _______L_______I______ -_______
423.87
---- .-------- L------------- �______ �_______�______
t' � iB-(Sto rFrr�roA7:G1'P_____
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,_Length 953 H_ �______ ___ __
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- { pd
418.00
_____�_
____ __ __ __ __ _ _Len 88-K1 h_.__
a1.00i
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_ __ _ __ __ -------- _ ____
__
_ _____ ____ _....... _
Dia 3b OO in_______
(Storm-Prop}.40 P
____.__ __ __ __ _ _ ___Dia 1 .00 in
Slope 0:0101 fl
__ __gyp nderf.41 S33 i[I__ __ ------ __
_ __ _ __ __ __ __
-----
- -
-------'- Slope O:Q'f0287fl�-------j ___ --_
98.70
____•------_!_______`______J_Op leve 41 ________ ______________ ______
$.53 fE '
_____ 893 ------ ------- ------_--_____
�Dn lnvert;41 ft-'
_____-_
30.00
'_______
------- '--------- isp t-erl 419.7311 ______
15.00
____;_______; _______; ______ -Dn Invert -417.531(_______; _______'_______'______
_____1_______'------_____ _______------- -------
0.0102
-----------
--
_------- _______ -----------
0.0411
---- .-------- .-------- .--------------- .------- .------- ______ ,_______ '_
----- '------- .------- ______
___ ____
____ ___-- ---------------
419.33
423.87
_______ _______ _______ ------- -------------------------
_______ ___________
1+00 1+10 1+20 1+30 1+40 1+50 1+60 1+70 1+80 1+90 2+00 2+10 2+20 2+30 2+40 2+50 2+60 2+70 2+80 2+90 3+00 3+10 3+20 3+30 3+40 3+50 3+60 3+70 3+80 3+90 4+00
Station (Its
41 JB
45-CB2
46 CB 47 -CB
48 -CB
422.30
424.00
424.12 424.13
427.94
416.30
417.13
418.53 419.33
423.87
1.05
418.00
418.56
419.72 421.19
424.37
(Storm-Prop}.40 P
(Storm-Prop}.41.P
(Storm-Prop).42-P
43-P
81.58
98.70
39.59
77.18
30.00
18.00
15.00
15.00
0.0102
0.0101
0.0101
0.0411
417.13
418.53
419.33
423.87
416.30
417.53
418.93
420.70
16.16
8.25
7.63
3.61
5.01
5.79
6.38
8.28
1.53
1.11
1.17
0.49

10 YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER S T E W A R T
10 -year HGL
Nodh Carolina Agricultural Sciences Center w w
4335
433 ----------------------------------- 7 --------- I --------;_________;__________________;_________;_________;____________________________;__________________________________________________________________ ____________ L ---- _----------
______- N __
432.5 ______ _________ ________ _________ _________ ________ _________ _________ __________________ _________ __________________ _________ __________________ _________ __________________ _________ __________________ __ �'___ ------------------ _
432 ------ ------------_ ---------;------------------J---------;--------- ----------------------------------- -------------------------------------------------------- -------------------------- ------ __ "'_y;---------
------- ------
431.5 i _______� __________ -__ ----------
T --------- ______4
C
431 ________________ ________ --------- .--------- L ------------------------------ L--------- --------- ,---------- .--------- _________,_--------- �
o
430.5 ---------------- ---------
______________________________,_________,_________,_________,_________;_________',_________,_________,_________,________ ;_______,�_________J,_________;____ ____;________ ;________
430 ________ ____ ____ _________________
, r r
429.5 ------ _--------- -------- ,--------- ._________________-_________,_________�________ ;_________,_________.________ --------- ---------
429
--------- --------- _________ ___________�'______--------- ____ _ ___ __ --------- _______
429 ------------------------------_____•---------•--------•---------•---______•________'_________•_________•__________________ _________ __________________ _________ _________________ _ ______ ____________ ___ ___
H a u
inR1D-{Storm FY,ap}45P
428.5W _____ ________ _________ _________ ________ _________ _________ __________________ _________ ______________ _________ __________________ _________ ________________b _C___iinR JD{Stor op) _ ___ __�Lengffr 2393 ft____ ____
428----Nt---------`--------1---------`---------`--------'---------`---------`--------'---------'---------`--------'---------'---------f--------'--------- --------- --------------- ------ -:L 351Ati------ --- --`-nia-isaa,.--- ----
427.5 -- -- ________ _________ -----------------------------------------______ _ _____ __'_-----ODIm_______ ___ __Ghne OAtOQ ffltf_
ago :_______________________________________�_______ ,Slope 0.029y Rift IJ
427 ____io;o_N______ ______
'+,-------- :6 10 T5torrfi-Frop}�43P�------------------1-- pinver142501-ft
ft
`p Invert 424.67 ft
W
a2s.5----6`a" -0aasee,n 1Mfneta2�sox gnlnve a2q 7ft
-------
426 ----------------------`--------'------------------`----------Slapa OJtM7_fllft---`-------- ----
a425.5 ----1 s_a_____,_---------T---- --------4-------- ----------Q Invert ________ __________________ _________, __________________ _________ ________________ ________ ________ ___
425 ____ a_- _____i nInvert 416.00 ft_____________________________________________________________________________
o_____________________________________________________________________
424.5 ______ _________ _______ _________ __________________
f424- _______________ _________ __________________ __ _________ __________________ _____
423.5 _____ _______- 1 i f ------------------------------- _ __---------- ____________________________---------------
423 _____ -------- _-------- --------- _------------------- _____________________--------- _________,_________.________-_________, _____ _____ _____ _____ ______ ___
422.5 _____-------- _-------- _--------- _--------- ---------- --------- _____ _____ _____ _____ _____ _____-- ----------
422
______ 422 _____ _________-I________;_________;_________ r________ ;_______ ________ ;_________;_________ r________ ;_________ _________ ________ ________ _________ __________________ _____
421.5 _____-------- -L-------- --------- _---------- -L------------------- ,--------- ______ ________ ________ _________ __________________ _____
421 ________________________________________________________ --------- --------- --------- --------,_________._________.--------- --------_____ _____ _____ _____ _____-- ---------
420.5
______ 420.5 -----------------------------%-------- ------ I ----------------- --------------------------------- I -----
____4420 _______________ ________ ------
4 9.5----
19.5_____ _____ _____ _____ _____ _____ _____ _____ ______
419 _____________________________________--------- --------- ---------- I ---------_________,_________,________ -_________,_________,--------- --------- _________ ---------_________ _________ __________________ _____
416.5 __________;_____________________________________________________________________________________________________________
418 _____---------------- _--------- _------------------- _____________________________ _____________________________ _____________________--------- -------_____ _____ ______ _____ _____ _____ _____ _____ ______ ___
417.5 -------------------- ---------- ---------- ------- --------I ------------------------------------------------- ---------------------------------
417 ------ ---------
________- __________________ ________-_________ T_________ ________ __________________________ --- __________________________--- ___________________________--- ______________________________________________________--- ______________
416.5 ---------------- _-------- --------- .--------- L -------- ._ _____ _____ _____ _____ _____ _____ ______
416__________________________________________________________________________________ --- ________,_________,________ --- ________,_________,________ --- ________ _________ ________--- ________ _________ ________ -_________ _________ ________--- ________
1+00 1+10 1+20 1+30 1+40 1+50 1+60 1+70 1+80 1+90 2+00 2+10 2+20 2+30 2+40 2+50 2+60 2+70 2+80 2+90 3+00 3+10 3+20 3+30 3+40
Station (It)
Node ID:
Rim (ft):
Invert (ft):
Min Pipe Cover (fi):
Mae HGL (fi):
Link ID.
Length (fi):
Dia (in):
Slope (fVfl]:
Up Invert (ft):
Dn Invert (ft):
Max 4 (cfs):
Mae Vel JUVj
Max Depth (ft):
45 C132
50 -AD
45 -CB 52 -CB
424.00
427.00
429.80 429.88
417.13
423.50
424.67 425.01
418.56
424.08
1
425.18 425.61
{Storm Prop).43-P
Ni--Prop)-44 P
{Storm-Prop).45-P
179.23
35.78
23.99
15.00
15.00
15.00
0.0307
0.0299
0.0100
423.50
424.67
425.01
418.00
423.60
424.77
4.55
2.79
2.08
8.19
6.08
4.04
0.57
0.50
0.54

10 YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER S T E W A R T
11 HG
North Carolina Agricultural Sciences Center
4465 ______•______ ------- ______;_______ 11______ r______ �_______ 11______x_______ 11______ r______ �_______,_____________ ______ ______________ ______ _______ ______ ------- ------- ,------ _______ ______ ---- h_y� r____;______ ;_______ 11______;_______x______;_
446 ______•_-----•_______•------ •-------`-_____'-------------•______------------------------ ------- `-----_.______ ------ ------------- --------------------•------------- ______ _____ - - ___-------------- ----
n m m
445.5 ------ --------------- -I ------ .-------- ______ __ ______________ ______ ______ ______ __ ______________ ______ _______ ______ _
445 ------ _______________------ _-------- -L ------ ,______:-------- .------ I -------- -L------ -_____ ______ _______ ______ ------- ------- .------ _______ ______ ___ 'D ye', J;___ ______________ L ______ _______ ______ _
444.5 -------------- ------ ------------------------ -------- ------------------------------- ------- ______ _______ ______ ______________ ______ _______ ______ _______ ______ _____c ,g C -------------------- .------ ._______,___+a_._
o a
444 � I i - I I -____________ --- __________ I i T "__________________________________________
__ _____________________ �_______.__ w __�_______.______,______ ___
443.5 ______L_ ______�_______._ _______L______._ _______
443 ______ ______ _______ ______ _______ ______ ______________ ______ _______ ______ _______:1 _____.______�' ______ ______________ ______ ______
_--_____ ______ _______ ______ ______________�� N __ _______ ______ ______________,______ _______ ______ ______
442.5 _ _______ _______ _____ _______ ______ _______------- _______ _______ ____ _____ ___ ______________ ______ ______
442 ______;______________; ______,,_______�______;-------- _____________,,_______�______;__ o-_________,______,_______ ______ ____________ __ _______ ______ ____ ______ _____ _____ ___ iDfIPE-73 ____�_______�
o-�� Y-�o-n
___________________�______�______________�_____________________-___________________________ .__________:______:______________�___ _ -_______:______:_____------------
441
_ _
v
441.5 a; u_____ m u __ _____ __Lgp�q____i__
441 - _ __ _______ ______ _____ - ______ _______ ______ _____ _____ ______ _ ___ _______ _____ _
_______________,_______._ _______. ______._ ,_ _______. ______._______,_______ m Ara 18.0
v"v"
___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ gi_____------------------------------__ ''__ ___ __ - ___ __ - - St 4e0.OLO ttlft___ -
440.5 --------------- ____________ _ __ __ _ __ ___ __ __ _ -_ __ __ __ h83.9®4t-_
--------L______.__ z�'"_____.______�_______�___ z c
" _____gla76d6' _____.___gip l(1v_er[43T.73ft
440_____x____________________ ___._
4395 _ ____ ______ ______________ ___ ____ ______ __ SlopeA _ _______ ______ _____ _____ ___ Dn loved 43Y.20 ft __ _______ ___ _
------------ ---; - 01ss;nlfl- -- ---
439 ______'_-----'----___`______d-------`_____________ ______ __ - _______ ______ _____ ___ ______
_UH-IdverL4369D_tt__ ; --,--_
.438.5 ------------------------------ _----------------------- _______.______.______-.____ _____.I __ ___ ___ __ ___
� ___---- --- On overt 436.122 `tt
---- Link ID 0-P
____~_______________________________ _______ _ Length -3.18 ft
438 � ________ Lire-10.Ex4�;_______; _______ _ _
437.5 W,______' _lrru __ _____ ______;___ -iia T8b0in----------- ------ ____ _______ ______ __________ ____ _______,______ _
'm 437 ____ m; ----------------------- --- Di�240010;_______�____ _____________*___ _____;______ ______ ______ _______ ------
436.5 00342 !ft - - - - - -- ------ 516pe irOr00 fitt_,_______� -- - --
"' 436.5 _____�,______ _______�_ P_p __n______ _______�______'_____________Up invert 434.62 ft,______ -______------ .------- _______-L______________ L______._
Up In�lert 433.29 k _
436 - Dn lnued 429 __ Dm-ert433.39i6;______ ;______ _____________________________ ------ _------- _------- _------ _-------
435.5 ___ AI'_____________-______, ------------------ _ _______-______________:__________------------------ ___________________________________________--- _______------ _______________
435 _____y_ ---------------------- _-------- _----- -------- _______.______.______-. ___ __ __--------------___ ___ __ ___ ___ _
____ _______ ______ ______ ___ __ __ __
434.5____ss_______________�______;_______ _____;______ ;_______�______' _____ ______________ -----------------------
434
_____ _______ ______ _
N ____ _______�_
434 ____ a -___________________ __.______.______ ,_ ____ ______ _______ ______ ______________ ______ _______ ______ _
433.5 o m ----------- - -- - - -- ------- - - - - --------- ------------- ------- --------------------
--------------
------ ------ -
w ry .
433 ____q _____________ _______ ______ _______ ______ ______--- ______ ______ _______
N
w ,
4325 ______ ___ ------- ------- .------ ______ _______ ______ ______________ ______ _______ ______ _
______
432 ____ o C __ ____________________--- __________________________________________________--- ______________________________
431.5 ----- ' -----J -----J-- --- --- ___ -- --- --- --- --- -- --- ---
431 _____ _____;______;___________________________------- ____________________ 11______;______ ;_______;_____________ ______ _______------- ,______ _______ ______ _______ 11 ______ ______________ Ir ______ _______ ______ _
430.5 _____ _______-L ------ ________-------- __ ___ _______ ______ ------- ------- .------ _______ ______ _______ L ______ ______________ ______ _
430 _____ __________________ ____________;------_-I______,_-------I---___:______----- ------ -------_______ ------
429.5 ______T______ -_______ ir______� _______ r______ T__________r__________________________________________________________________________________________________________________________________________ r________
429 ______------- _------- _------ _------- -------- ------- ------- _-------------- -------- ------- ------- _-------------- ------- _------- ______-,_____-.______-,____ ___ ___ ___ ___ __-- -------------
426.5
___ ___ 428.5 T, ------ � � � � � � � � � �
1+00 1+10 1+20 1+30 1+40 1+50 1+60 1+70 1+80 1+90 2+00 2+10 2+20 2+30 2+40 2+50 2+60 2+70 2+80 2+90 3+00 3+10 3+20 3+30 3+40 3+50 3+60 3+70 3+80 3+90 4+00 4+10 4+20
Station (Its
Node ID:
Pim III):
Invert III):
Min Pipe Cover III):
Mae Hi III):
Link ID.
Length III):
Dia [in]:
Slope (fVfl]:
Up Invert III):
Dn Invert III):
Max 4 [cfsj:
Mae Vel JUVj
Max Depth (II):
ort South_G ulfall
70 RI
71 -RI
72 -JD
73 -AD
439.00
439.00
442.90
440.00
429.62
433.29
434.02
436.70
437.73
4.13
430.49
434.30
436.26
438.83
438.78
EXP
70-P
72-P
PIPE 73
107.19
63.18
89.00
52.74
24.00
18.00
18.00
18.00
0.0342
0.0100
0.0166
0.0100
433.29
434.02
436.70
437.73
429.62
433.39
435.22
437.20
16.24
12.76
12.06
3.85
10.98
7.37
7.00
4.07
0.92
1.40
1.35
1.25

10 YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER S T E W A R T
10 -year HGL
North Carolina Agricullural Sciences Center
Node ID:
Pim (fl):
Invert (fl):
Min Pipe Cover (fl):
Mae HGL (fl):
Link ID:
Length fl):
Dia (in):
Slope (fVfl]:
Up Invert (fl):
Dn Invert (fl):
Max 4 (cfs):
Mae Vel JUVj
Max Depth III):
FRONT010
_--------- _---------
62 -CO
n
446.5
------
_________________________________________________�__________, _________�_________
_________--------------------------------
______,n
_ __________
_________ _________ _________
___
441.11
441.56
__________
_ __________
_________
440.82
445.5
� �
442.19
_________ _________ ________
I __________
_________ _________ _________
104.67
445
----------------
;-------------------- }_________;_________;_ -------------------------------- ----------------------------------------
18.00
_________________________________
_
___________________
______________________
0.0060
_____
-------
444.5
444.5
------ _---------
_--------- _-------------------- _--------- ___________--------- ___________,----------- .---------- .__�
a m ;
.. _e_._________._________
----------
'__________. _________' ________.______
440.00
_________ ,__________.
_________._________.________
444
1.90
________ _________ _
4.66
2.68
2.88
_________________
Link lD jStor_m-prop L60 -P _________
0.93
0.68
'�
~ L
Length 5828tt
443.5
z;W o
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_____1 --------- 1� ---------- --------- '_P _______1_________ �----------
m
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11 04.67 ft
2 a H ;
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63.x6 ft ; �
Die 15 00 in
;
�
;Up Invert 441 .56 fl
;
a 443
____
_____• __________'_________; _______DM 96130 in __•�_________' __441
' ________________________
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____________________
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442.5
____x
s_K_______________�,_
-_________; llfl l[iYEtt 440SxiH1 _____________;__________; _________:__
__________
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lnyert 440.73 ft______; _________;______
w
00 ft
442
'---------'----
441.5
-----
441
_____------------
_
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440.5
_____
440
____,__
439.5
_____
__________________----------
_--------- _-------------------- _
___ _____ ______
______--------------------______
______-----------
______ _
439
439
_____
_________
___________________;_________:_ _________; _________ _________
_________
_________ _________ _________
-----------
_________ _________ _________
___ ______
438.5
______
_______'_________l
__________'__________r_________-_________'_________'_________'__________`_________'________
� � � � �
____
______
_____
____
1+00
1+10 1+20 1+30 1+40 1+50 1+60 1+70 1+80 1+90 2+00
2+10 2+20
2+30 2+40 2+50 2+60
2+70 2+80
2+90 3+00 3+10
3+20 3+30
Station (It)
Node ID:
Pim (fl):
Invert (fl):
Min Pipe Cover (fl):
Mae HGL (fl):
Link ID:
Length fl):
Dia (in):
Slope (fVfl]:
Up Invert (fl):
Dn Invert (fl):
Max 4 (cfs):
Mae Vel JUVj
Max Depth III):
FRONT010
61 -AD
62 -CO
63J0
442.00
442.83
445.11
444.84
439.00
440.63
441.11
441.56
2.03
440.82
441.76
441.94
442.19
(Storm Prop). 62-P
{Storm-Prop).61 P
{Storm-Prop).60-P
104.67
63.86
58.28
18.00
15.00
15.00
0.0060
0.0060
0.0060
440.63
441.11
441.56
440.00
440.73
441.21
6.34
2.61
1.90
4.66
2.68
2.88
1.04
0.93
0.68

2S YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER S T E W A R T
25 year HGL
North Carolina Agricultural Sciences Center
444
------ •------- ------- •--------------- •-----------------------
•---------------
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•----------------------
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442
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--.-_-440
423.18
429.12
1.50
4.00
2.83
440
.-----:-----"--- ------I------{--------------{----.--`---.----------"------*------""
407.40
- - - - -" - - - - -"------------"--------------"----.--"---.------.------.---*------
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. - --- -
438
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link lD pa81_We$[_6 f ;
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436
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Length 146 O0 fi
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lii 2400�rn
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434
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422.03
423.18
slo o40aoi nm
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403.00
406.50
422.03
423.18
„
Up Invent 429.12 k
15.62
15.69
432
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2+20 2+40
2+60 2+80 3+00 3+20 3+40 3+60
3+80 4+00 4+20 4+40 4+60 4+80
5+00 5+20 5+40 5+60
5+80
6+00 6+20 6+40 6+60 6+80
7+00 7+20 7+40
stall- [II]
Node ID
Rim [ft]
Min Pipe Cover [ft]:
Max HGL [ft]:
Link ID:
Length [ft]'
Dia (in)
S lope [ft/ft]
Up Invert [ft]:
Dn Invert [ft]:
Max 4 [cfs7:
M ex Vel [Ills]:
Max Depth [ft]:
ost-N Orth 0ullall
Channel_ convergence
81 H W
02JD
410.00
428.03
428.01
435.00
403.00
406.50
422.03
423.18
429.12
1.50
4.00
2.83
403.87
407.40
422.49
424.85
429.98
channel_norlh
01 channel
{Storm Prop}.02 PIPE
post_wasl_offda
123.00
243.00
112.42
146.00
24.00
24.00
24.00
24.00
0.0285
OA639
OA102
0.0407
406.50
422.03
423.18
429.12
403.00
406.50
422.03
423.18
71.37
15.62
15.69
15.09
5.42
3.87
9.25
7.24
0.88
0.67
1.04
1.25

2S YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER S T E W A R T
25 year HGL
Nor[h Carolina Agricultural Sciences Center W
426
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406.50 407.50
410.40
413.50
415.50
424
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423
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422
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407.50
410.40
413.50
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416.50
419
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418
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417
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415
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414
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413
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405
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2+80 2+90 3+00 3+10 3+20 3+30 3+40 3+50 3+60
3+70
3+80 3+90 4+00
Station [It]
Node ID
Rim [ft]
Min Pipe Cover [ft]:
Max HGL [ft]:
Link ID:
Length [ft]'
Dia (in)
S lope [ft/ft]
Up Invert [ft]:
Dn Invert [ft]:
Max 4 [cfs7:
M ex Vel [Itls]:
Max Depth [ft]:
10HW
11 JB
I
12 -RI
BACK010
410.00 412.00
421.95
421.00
419.00
406.50 407.50
410.40
413.50
415.50
1.50 1.80
8.85
0.00
407.40 408.54
413.55
416.89
417.58
10 riprap
(Storm-Pmp1.10 P
(Storm Pmp}.11.P
RIM
40.00
124.12
105.98
24.00
30.00
30.00
4200.
0.0250
0.0218
0.0274
407.50
410.40
413.50
416.50
406.50
407.70
410.60
416.50
51.18
51.17
51.17
40.85
6.46
11.47
10.58
0.00
0.97
2.13
2.50
0.00

2S YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER S T E W A R T
25 year HGL
North Carolina AgriculWral Sciences Center
428.5 ----------------------------- ;------------------------------------------------------------------------------------------------ -
428 ______'----- _---- '__------ __'---- _----- '---------- '--------- _'----- _---- '__-------- '---------- •---------- •___------ _•----- ----- ------ ------ ------ ------ ------ ------ ------ ------ --------------
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427 5
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4255 -------------------------------- --- ---
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424------•----------•----------•----------•-------------------------------------------------------------------------------------------- -----------------"-------------------- - -- -- ------------------------------ ---
Length 192.17 fl
-- w- Did 18V6 -
423.5------•----------•----------•----------•----------'-----------•----w-------------------------------------------- -- - ---------------------------------------SLOP]--------------------------------------- ---
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422
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420 5 I-----------------•-----Len}23.94fl-------------__________,_________:__________'_b_____ x x ti
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420
419.5 ---------------
419 ------------`----------•----------•----------'------------------•----------'----------•---------- ----------•-----
418.5 ----- ------------------
418 ----- ---'----------'----------'----------'----------'----------'----------'----------•----------•----------•-----
4175 -----
417 _____----- ____------
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414
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1+00 1+20 1+40 1+60 1+80 2+00 2+20 2+40 2+60 2+80 3+00 3+20 3+40 3+60 3+80 4+00 4+20 4+40 4+60 4+80 5+00 5+20
Station [ft]
Node lD
Rim [IQ
Min Pipe Cover [II]:
Max HGL [II]:
Link ID.
Length [It]'
Dia ]in]
Slope (itlltp
Up Invert
In Invert
Max 4 [ds]:
Max Vel [ftls7:
Max Depth [fl]:
021 21 -AD
22 AD
23 AD
419.00 420.33
420.39
425.72
415.50 416.73
417.75
421.00
417.58 418.94
419.98
421.48
{Storm Prop}, 20-P
{Storm-Prop7.23-P
{Storm-Prop7.24
P
123.10
104.59
192.17
30.00
30.00
18.00
0.0100
0.0078
0.0156
416.73
417.75
421.00
415.50
416.93
418.00
31.73
26.84
2.96
7.28
6.10
2.69
2.14
2.12
0.99

2S YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER S T E W A R T
25 year HGL
N orth Carolina Ag,-1t,,ral Sciences Center
431 �.
430.5-
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425.5
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422.5
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421
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419
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4185
;_____
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______ _____ ______ _____ ______ _____
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418
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417.5
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417
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0+90 1+00 1+10 1+20 1+30 1+40 1+50 1+60 1+70 1+80 1+90 2+00 2+10 2+20 2+30 2+40 2 -SD 2+6D 2+70 2+80 2+90 3+00 3+10 3+20 3+30
3+40 3+50 3+60 3+70 3+80 3+90
4+00 4+10 4+20 4+30 4+40 4+50 4+60
Station [ft]
Node lD
Rim [IQ
Min Pipe Cover [It]:
Max HGL [It]:
Link ID.
Length [It]'
Dia ("
Slope (ft,
up Invert [It]:
In Invert [IQ:
Max 4 fds7:
Max Vel (ft?
Max Depth (IQ:
22 AD 24 -AD 25 AD
26 CD 27J D
420.39 421.33 426.00
427.20 428.09
417.75 418.75 421.08
422.99 423.82
419.98 421.33 422.27
424.12 424.31
{Storm Prop}, 25-P
{Storm Prop}, 26-P {Storm Prop7.27-P
(Storm Prop}.28 P
104.85
115.42 64.61
72.25
24.00
24.00 24.00
15.00
0.0076
0.0185 0.0266
0.0100
418.75
421.08 423.00
423.82
417.95
418.95 421.28
423.10
1967.
1528 15.00
208
6.27
5.58 9.03
2.67
2.00
1.60 1.06
0.76

2S YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER
25 year HGL
North Carolina Ag,,cW rat Sciences Center
S T E W A R T
434
------•--------`- •--------`----------------'- ----------------- •--------•- •- ---------•--------,--------•--------•--------•--------`---------------- -----------------
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427.20
4335
4335
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422.99
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433
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432.5
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24.00
a C -
0.0127
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425.30
425.80 426.50
424.20
432
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t _____ _______
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429
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---
426 5
_______-_------;------------42fi
____----------------------'--------4255---------------------------------------------------------425
1-4
____
______'_________________'_______---_---------------------
----------------
_------- --------4245
----
-------------------------------- ---------------
------ -------- --------424
---------------------------'--------'--------'--------'--------,--------
F--------'----------------,-------'--------'--------`--------'--------'----------------
--------------------------"-----
------ --------------4235
-------------------------------------'--------'
------------------------------
"------------------------"-----"-----
------ --------------423
----'-----------------------''--------'--------,--------
------------------ F--------'-----------------------'--------'--------`--------'--------'----------------
--------------------"-----"-----
--------------------
-----
422.5
------•--------•--------•--------•-------'-----------------------------------•--------•--------•------------------------,--------,---------------------------------------
--------------------------------
-------------- ------
-----
1+00 1+05 1+10 1+15 1+20 1+25 1+30 1+35 1+40 1+45 1+50 1+55 1+60 1+65 1+70 1+75 1+80 1+85 1+90
1+95 2+00 2+05 2+10
2+15 2+20 2+25
2+30
Station [ft]
Node ID
Rim [IQ
Min Pipe Cover [It].
Max HGL [It].
Link ID:
Length [It]'
Dia ]in]
Slope pVIQ
Up Invert [It]:
Dn Invert [It]:
Max 4 [ds7:
MaxVel [ft? ]:
Max Depth [It]:
26 -CD
20 AD 30 CD
31 -CD
427.20
429.00 431.51
431.50
422.99
425.30 425.80
426.50
424.12
426.46 426.68
427.04
{Strom Prop}.29 P
{Storm P,op}.30-P 31
P
86.66
19.63 23.97
24.00
24.00 18.00
0.0127
0.0153 0.0125
425.30
425.80 426.50
424.20
425.50 426.20
1208
4.96 2.12
6.99
3.56 4.17
1.05
0.92 0.51

2S YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER
441
4405
440
4395
439
438.5
438
437.5
437
4365
436
4355
435
434.5
434
433.5
433
'm
4325
432
431 5
431
430.5
430
429.5
429
4285
428
4275
427
426.5
426
425.5
425
Node ID
Rim [IQ
Min Pipe Cover [It].
Max HGL [It].
Link ID:
Length [It]'
Dia ]in]
Slope pVIQ
Up Invert [It]:
Dn Invert [It]:
Max 4 [ds7:
MaxVel [ft? ]:
Max Depth [It]:
25 year HGL
North Carolina Agricultural Sciences Center
S T E W A R T
1+00 1+05 1+10 1+15 1+20 1+25 1+30 1+35 1+40 1+45 1+50 1+55 1+60 1+65 1+70 1+75 1+80 1+85 1+90 1+95 2+00 2+05 2+10 2+15 2+20 2+25 2+30 2+35 2+40 2+45 2+50 2+55 2+60
Station [ft]
30 -CD
_------- ------
-----------
------ ------ I ---------
431.51
- -
_
_____'______'_______r ---- __'______s______ - r------`------'--------r------'__________________________'_____________________________________________________________-------------_---------
---------------------
______------ _--------------
`v�L
--
-
-----,-------`-------------------- ------ •------ ---------------------- -------------
------ ------------- ------ ---
- ------ ------ -----------------
433.96
-- --
np
'--Length
{Storm-Prop)
----- ----- ----- -� ---- - ---- --------'� ------ -------------'-------�- ---- ------ -------•Ink ID-- - m-Pro•-32-P--� -------------------------- ---------"---'-
''-i 4 j5t�` el
--"--- --"--- ------ ------ ----- --
-----
24 63 ft.----------
15.00
--
-----•------ •-------�•------ •------ •------ ------•------'- - ---- - ---- ------------- -- - ------ ----- ----- -------------------- ------------------
- -- - - -' -
Leng[h 133 4C ft
---- -- ------------ ------ --
� � � �-
------ --- -----------
434.00
--
- - - Dia 1500 ins ______'____ �
- - -�
----------------------------------------------------J---------- ------ -----
----------%------i_-----------------
------ ------ ------------- ------ ---
:Slope-00lfit Rfh-
------- - ----------
;
--
r
-------------------------i-------- --s 'obsl-r'm----- ------ ------------------ ------ ------
------ tt
------ ------ ------------- ------ ---
----------------
--
_ ___ {4PlmMrf433413ft-----
C. lnveN 43360tH
------ -------0_Drr lrtviA 4265h R-
a
v
s_ta_ ,-------
_ _
----'
1+00 1+05 1+10 1+15 1+20 1+25 1+30 1+35 1+40 1+45 1+50 1+55 1+60 1+65 1+70 1+75 1+80 1+85 1+90 1+95 2+00 2+05 2+10 2+15 2+20 2+25 2+30 2+35 2+40 2+45 2+50 2+55 2+60
Station [ft]
30 -CD
32 CD
33 -CD
431.51
437.83
437.83
425.80
433.60
434.00
426.69
433.96
434.39
IStorm-Pmp).32 P
{Storm-Prop)
.33-P
133.46
24.63
15.00
15.00
0.0517
0.0162
433.40
434.00
426.50
433.60
253
1.17
970
3.79
0.35
0.37

2S YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER
447
446.8
446.6
4464
446.2
44fi
445.8
445.6
4454
445.2
445
4448
444.6
4444
444.2
444
443.8
443.6
4434
443.2
'm 443
442 8
442.6
442 4
442.2
442
441.8
441.6
441 4
441.2
441
4408
440.6
440 4
440.2
440
439.8
439.6
Node ID
Rim [IQ
Min Pipe Cover [It].
Max HGL [It].
Link ID:
Length [It]'
Dia ]iny
'In
"t'IQ
Up Invert [It]:
Dn Invert [It]:
Max 4 [ds7:
MaxVel [ft? ]:
Max Depth [It]:
25 year HGL
North Carolina Agric It -I Sciences Center
S T E W A R T
.............. ................. ......... ......... ......... ................ ........... .. ------------- ------ ---------- ......... ........ .................. ............ b �'S.
5
- z a" rCi -- - __ - - -- - -
x a
-----'---------r--------'---------'---------'---------`---------`----------- ----- ---- - -
--
.. L-en9fh;M134.5'rk............�........ ...
-----'---------'--------'---------'---------'---------'---------`--------'------- -'- ---- - -- --'- ------------------------------ --- -------------- -------------------------------
------------------- ---- ---
_------- ----�Slope40100ItiR- .
---------- - --------- --------- - --------- ,...UnJoveet.44397 -fl ..--------- ,-------- ........ - ----- -----
Dn InveA 441.70 R '
.....{.........: ........ {.........;.........; .........
Link ID 37 p., .. ............... ...
_____•_________•________"_________'_________•_________• ___ - _------ -'--------- --------- ----- ----- - - - --
Length 2l 70 (____ __ __ _______
I- _____•____•---Linkl0. -p ______'________•_________•_-------------------
-----
Slo 1B00115ftft_ .........
--------- ------ -�--m-;---------'---------'--Leo 6azR-----'---------'---------'- Pe ---- ------ -------------
I .a7 ,09in---------------- Up Ip4eW 44T 75 -ft. .
Slo a 0.0099 Rift -Dn IEvek-44TZSR-
�N IJP Invert 4+11.05 R
... y..w .p >, ... Dn Invert 4b 0.36 R --------------------
----
.......... .....
8535: � �..�........... .......... .....
_________ - --------------- --- _________ _________ _________ __
e H
. ......... ......... ......... L ........ . ..
--- v s`nt . ----p-- -----4---------1---------'---------
--------------
---x 1r'gea4aq.+---------- - -'- - ------'---------'---------`---------`--------'---------'---------'---------`-----------
-It ft
'------------ -- - - ----- - - -.-- ----------...........
1+00 1+10 1+20 1+30 1+40 1+50 1+60 1+70 1+80 1+90 2+00 2+10 2+20 2+30 2+40 2+50 2+60 2+70 2+80 2+90 3+00 3+10 3+20 3+30 3+40
Station [ft]
34.HW
351JB
36 AD
37{B
38 -CB
6.00
6.00
445.00
445.25
445.45
440.00
440.16
441.05
441.50
443.01
000
000
440.33
441.77
441.98
442.28
443.57
35-p
36 p
37
p
38 p
14.00
69.47
21.70
131.55
15.00
15.00
15.00
15.00
0.0100
0.0099
0.0115
0.0100
440.16
441.05
441.50
443.01
440.02
440.36
441.25
441.70
6.55
3.17
2.77
2.11
5.58
2.96
4.05
3.93
1.13
1.09
0.75
0.57

2S YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER
427
426.5
426
425.5
425
424.5
424
423.5
423
422.5
422
= 421 5
421
w 4205.
420
419.5
419
4185
418
417.5
417
416.5
416
4155
415
Node lD
Rim [IQ
Min Pipe Cover [II]:
Max HGL [II]:
Link ID.
Length [It]'
Dia ]in]
Slope (itlltp
Op Invert
Dn Invert [II]:
Max 4 fds7:
Max Vel [ftls7:
Max Depth [fl]:
25 year HGL
North Carolina Agricultural Sciences Center
S T E W A R T
-----, r , , , r , , , r r r r r r r r r r r -p
I +00
-yr---
-----'----------- i i- - - - - - - - - - -'- - - - - - - - - --
419.00
422.30
- -
T T
415.50
416.30
C
-----------------------------*-----------*-----------------------------------*--a- :
'---------------------'-----------; - q ---------- L-----------'-----------'-----------'-----
-----"---�---------�-----"---'�
: L -
D
nk - 41 p --
Length 64:71 tt
--------------
----------- --
-------------------- -
---
---
-----•-----------'- •----------- •-----------•-----------'- v
d 9
421.43
----------------------------------------------
Link 0044-P
---
2
Slope 0 0155 ft Yt
64.71
----------- : .---
- -----------
-----. -lpTweri-7-PP if
------;
0.0095
0.0155
-------------------------------------------------------------------------------
---'-----------,-----------`-----------`-----------`-----------`-31n
Neeri 41.00 n------`-----------`-----------`---------
421.00
------- -------
-
--- ~' ----------------�-----------
u o
:w--------•-----------•-----------•-----------'---------•-----------•-------•-----------•-----------'�
-------------------
---
r ,+Lin ink -08
6.57
---
--------`--------- en�F 31 73g --------------- --
---"----
---------
- -------------------------------
--- o
d ? 30S]R trt----•-----------•-------------------
.w -a-"--------------- ------------••-----------•-----------•-----------`-
------"---
--------------------------------
-----------------------------
w H � Slo �O.OWS ttltt
pe
------------
:
-----
---------- '------DP-InvB "t)-fl--�----------- :"
-----------"-----
------"----------------------
DnI1416.00tt :
-------------
----------------}- - -----------7-----------7- -------------- -----------
r ----------- r ----------- ----------r ----------
------------- ------------ ----------I
.--------
---------- I -----
----
1+00 1+05 1+10 1+15 1+20 1+25 1+30 1+35 1+40 1+45 1+50 1+55 1+60 1+65 1+70 1+75 1+80 1+85 1+90 1+05
Station [ft]
BACKBIC
41 JB
44 -CB
419.00
422.30
424.68
415.50
416.30
421.00
1
05
417.58
418.22
421.43
Link 0044-P
31.73
64.71
30.00
15.00
0.0095
0.0155
416.30
421.00
416.00
420.00
22.45
1.54
6.57
4.29
1.72
0.42

2S YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER S T E W A R T
25 year HGL
N orth Carolina Ag,icult-1 Sciences Center
4295 '------ -------------'-----;_---- _----'-----;_____;------ _____'_____;_____------'_____;_____ ''_____;_____ ''_____;_____ ------ ______ _____ _____ ------ _____ _____ ------ _____ _____ ______, _____ _____ ------
4
w-
429 `-----•-----'------'-----'"------`- •-----•-------'------------- ----------------- ----- ------ ---- ----•------------------------ ---- - ---- ----- ------ ----- ----- ------ ---- - --------------- ------------ - -
428.5 ------ •-----•------•-----•-----•------ •-----•------ •-----------•---"-• ----• - - -- -- - - -- - - -- - - -- - - -- - - -- -- - -- -
428 `_____•-----'------`-----'-------`- _____ `_____ _________________ _____ ____________ ______ ______ _____ _____ ______ _____ _____ ------ _____ _____ _____ �'______ _____ ------
i
----- -
v d ?
427 5`-----'-----'------`-----•-----'�-"----------•-----��-----'------•-----��-----'------`-----•-----'------`-"--`-----•-----'------`-----•-----1------`-----•-----'�------- `-----�`-----•----- ----- ------------- -��-
a27-----+-----*-----�'------------ *----- 1 ------------- ----- ------ ------ ----- T ------------- r ----- T ----------- --------w - - --------------------- -----
426s------>-----%------------k-----I -----%- -----I ----*----- ---- - --------------------- ----- ------ ---- ----- ----- ----- ----- --- - -- --
426 ----------- ------'------ ------'- •---- -------'------'------ ----------- ----------------------------•----- -----------•----- ------ --- - -- ------ ----- ----- ------ ----- ----- ----- ----- --- ------
4255
-----4255 -----------'------'-----'-------'- ---- ----------------- ----------------------•------------------ ------ ----- ----- ----- ----- ----- ------
425 -- - --- ------ ---------------- ---- ----- --- ---1----- ----------------- --- ---- ----- ------ ------
w
-
k l Lgndh 5
424.5 ____________ _____ ____________ _____ ____________ _____•--------------------•_____ ______ ___ - __ ______ _____ _____ __ - _____ --- _____ ________
424 I r; w ----- --- --- ----- ----- -------------- ------ _____�_____---------z--C-- ______ __ 5P.22 ft 2� P
____ � ____ ______� ____ �� in
- -----------------'-----'----Link lRLink:W --'------`----- --'---
423 5 F-----------{------}-----}------ }-----:o M ---- I - ----- ------ - -- ------------
--------------- -- SWPa 0A�4 ttm i----- r----- ---5--
m x H Lepgfh 9299n ---- -- -up lnvek 4P1.21 n:
423x----------- ------ -----�-------�- - ---, 'r- 'r- ------,---- -- ------ ---- - - ----------- , ----- ---- - --- ---- ------ ----- ----- --- - -- ----- ----- ----- ------
'3
----- --
.�-----------•
------ --- tint -vert 418-66 RP-
4225 -------------- ------ -------------- ----- ------•- `� � '- •-----`------'- - - - - -
y _-----_______ ______I _____ ----- `_ Dr nvert 41 85fl ---- I � ------
Inv� ---
422 '___�•u ______�_____•_____._____"__ _______ ______ ___ ____ ______ ______ _
o
;oa1 .71 n
m 421 5 `---woo--_ _ _ ek ____ ______ __ - ---- ------
421
--
w ----- •-----1-----"------ ____ -
421 •--- d ? LinkICAOL' 0 n, ---"--•- ----- ----•- ---- - ------------ --
420.5 `----°' c oPeir0085R ----------- ----- ----------- ------ --
- ------ ------ - -
420 F___x a -w _ Le 9t 73 -_------___
419 5'•----- -----'-----71pJove¢-4i6.3Q-ry----,-----; -------------------;------ ;-----;----------- ---
---'------Dn lnvett 416.00 fl----:- ----- ----------------- --
419 ---- ----:•-----,-----'------•-----,-----•------•-----•-----,------•-----•-----,------•-----•-----,------•----- ----- ------ ---- - ------------"-- ----------------- --
418.6 ------ ------ - -- - - --------- -- ------
418 ` ---- ----- `----- ------ ----_`-----'------`---- - -- - - -- - ---------- - -- -- - --------
4175-
--
417.5 ----------- - - - -- - - -- ------------------- -- -- -- --------- ------
---
417 `�---- ------ ------ ------------ `-------- ------ r-------- ------ ------ ------
4165 •______------------------
416------
----
-
'•---- -----•__________;______p _________________ _____'_____'_____ ------ ----------_•_____ ____________ _____'_____ ------ _____'_____ ______ _____ _____ ______ _____ _____ ------ _____ _____ _____ _____ _____------------
415 5 --------------•-----•-----`------------•-----•-----------•----- ,----- ----'- -- ------ ---- ----•-------------------- T --------- - ---- ----- ------ -----T ----- ------ I---- - ---i ----- ------ -----i ------ ------ --
415 •----- •------------------ •-----•------- •-----•-----•------ ------ •-----•------ ------ •-----•------ ------ ----- -- - - -- - -------- - -- - - --------- --------- -- --
414.- •-----•-----•------•-----'-----"----•-----•-----•-----------•---"-• ----• -----•--
0+95 1+00 1+05 1+10 1+15 1+20 1+25 1+30 1+35 1+40 1+45 1+50 1+55 1+60 1+65 1+70 1+75 1+80 1+65 1+90 1+95 2+00 2+05 2+10 2+15 2+20 2+25 2+30 2+35 2+40 2+45 2+50 2+55 2+60 2+65 2+70 2+75 2+80 2+65
Station (ft)
Node ID
Rim [IQ
Min Pipe Cover [II].
Max HGL [II].
Link ID.
Length [It]'
Dia ]in]
Slope [Itlltp
Op Invert
Dir Invert [II]:
Max 4 [ds7:
MaxVel [ft? ]:
Max Depth [II]:
BACKBI0
41 JB
42{B
43 -CB
419.00
422.30
423.33
426.41
415.50
416.38
419.85
421.21
1.05
417.58418.22
420.37
421.50
LInk08
LInk09
{Storm-Prop7.22�P
31.73
92.99
58.22
30.00
18.00
15.00
0.0095
0.0123
0.0234
416.30
419.85
421.21
416.00
418.71
419.85
22.45
2.37
1.14
6.57
4.41
3.44
1.72
0.50
0.39

2S YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER
431
430.5
430
4295
429
428.5
428
427.5
427
426.5
426
425.5
425
4245
424
0 423.5
423
w 422.5
422
421 5
421
4205.
420
4195
419
4185
416
4175
417
4165
416
4155
Node ID
Rim [IQ
Min Pipe Cover [II].
Max HGL [II].
Link ID.
Length [It]'
Dia ]in]
Slope [Itlltp
0p Invert
Dir Invert [fl]:
Max 4 [ds7:
Max Vel [ftls]:
Max Depth [fl]:
25 year HGL
North C -1 -AD -It -1 Sciences Center
S T E W A R T
45.CB2
46 -CB
v
d�?
424.171]
424.12
424.13 427.94
.- �
----------
erx
----------------
----- ----- ------------------------------------ ------ ------
----- --------------- ------------- ------ --------------------- ---
-------- ------ ------
-----'-------•-------'--------------
j ------- -------
-----
-------------------------- ------
___------- _-----------
___------- --- ---
- 1'nk ID 43P ---- ,-_----- ,--- -- ___ ---
--'--
w -�
- --•-- --•-- --,-- --•-------
-
- - --'- --,-- a4----
----- -- - --
f
--- -- -- --
,:;r-: a: 1 f
- �'Leng[h 7'f_18 k-- - - - -- -- --- --
-
----- - - - ------ ------- ------- ------- ------ -------
---------------
�-- f--
y
------- ------- ------ ------- ------ ------ -------------- ----
f--
--- - ----- ------ -- ----
-pe
--- ------- --------
o' 15 p0 in
--- -- - - ----- ------- --- ---
w , j-------j-------%---itr
-------%------------------------------------------------�---- ,,,
� �
cv
387k
m'ao
v---;--
30.00
18.00
15.00
15.00
0.0102
0.0101
0.0101
0.0411
417.13
----
--- 0
5
-------3--------------}---
s H
4---•-------------------
423.87
- ---------------�---
------------------- ------
-------
-----
------ ------ -----
- ----- ------ -----
418.93
-------------------------------
------------------------
--- ---
-- - -----
18.92
9.51
8.82
--
Linki0 {Storrh-Wop}A7P
5.75
7.29
-----
-------
------ --"-'�------'-------•-------•-------`------'-------
1.72
---- •------- •-------- `-----tiAk - - ------------------ ------
------Leogtlt
i39 S4 b-'"-----
-- --
J
---- - ----------------------
----
---"-•- -
- -------------•------•-iB
in}�-P----_ -------------•------
----'
Dia 1_1 00 in
-"-----
----•-------:-------
Lenglh18158 ft_•_______`______ `______
eo1$.00
Slope 0.0101
-------------
Dip X9.00 in
___•_ _____' �`______ �_______ �______
Slope 0;0101 fllft;
_____
�i]p lnveri X1333 if. _____
33 i
___---
--- --- _______ _ -_____ _______
------�----"--•-So i9Hh----
-_-_-_-_-_••�
--_--_--_--_
-------;-------•------•- -- ------•------------- ------
•'_______••_______-•
&
•• ------- -
----`-----
------- ---------- I]Plnvej1T.1i---------------------
----•--------------;------•- �ninv47'5i--------------- ---------------
-
-"--
-------- ------- •------- •------- -
-'______� nved 41b30R _______•'______"`_______
Oa
------ -----'-------------______"________
_____------- ---_---_______-______
_•--_-----
______ _______
1+00 1 +1 0 1+20 1+30 1+40 1+50 1+60 1+70 1+80 1+90 2+00 2+10 2+20 2+30 2+40 2+50 2+60 2+70 2+80 2+90 3+00 3+10 3+20 3+30 3+40 3+50 3+60 3+70 3+80 3+90 4+00
Station [ft]
41JB
45.CB2
46 -CB
47 CD 48 -CB
422.31]
424.171]
424.12
424.13 427.94
416.30
417.13
418.53
419.33 423.87
1.05
418.22
418.75
419.99
421.59
424.37
{Storm-Pmp7.40
P
{Storm Pmp}.4bP
{Storm-Pmp7.42
P
43 P
81.58
98.70
39.59
77.18
30.00
18.00
15.00
15.00
0.0102
0.0101
0.0101
0.0411
417.13
418.53
419.33
423.87
416.30
417.53
418.93
420.70
18.92
9.51
8.82
4.16
5.12
5.75
7.29
8.28
1.72
1.34
1.20
0.70

2S YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER
4335
433
4325
432
431 5
431
4305
430
4295
429
4285
426
4275
427
4265
421
425
425
4245
424
4235
423
4225
422
421.5
421
4205
420
4195
419
41t3: 41
4175
417
4165
416
Node ID
Rim It)
Min Pip, Cover [It].
Max HGL [It].
Link D
LLength [It]'
Do lin
'In t't�
P� I
"
Up Invert (ft).
Dn Invert [It]:
M.Q df,
.. "e, [ft?�
Max Depth (It
25 yeer HGL
N .,th C-1— Ag,—lt—1 Sciences Center
----------
---- ------- ------ --------- --------- --------- ---- ---- - ------ --------- --------- ------ -- ---- ----
------------------ T --------- r ------------------ --------- ------------------ --------- ---------------------------- ------------------- --------- ------------------- --------- ------------------------
---------- -------- --------- --------- L ---- :
--------------- -------------------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- ---------
----- ------- ------ ------ - -------------------------- --- T -- ----------------- --------- --------- ---- ---- -- ------ --------- --------- --------- ---- ---- - ------ --------- --------- ------ -- ---- ---
----------- ------ ----- ------ - ------------------------ --- -- ----------------
------------------- ---- ---- - ------ ---------- ------ ------ -- ---- -----•---------`- ------------------------------ ------------------- ---------•---------`- --------- I ---------`---------'- --------- L --------- --------- ---------------------------
--
-----------------------------•----------•-------- 4 ----------•---------•--------- --------- ---------•--------- --------- ---------•--------- --------- ------- - ------- --------- --------- 4
---------- I -------- --------- T --------- -------- I ---------- T --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- ------- ------ --------- ---------
---------- -------- --------- ------------------- I --------- --------- I ---------- --------- --------- --------- --------- --------- --------- --------- --------- --------- -------
-- -------- ........ Li.k
--- 'Ji ----- -------- --------- T ---------- r -------- I ---------- T --------- --------- ------- 4 --------- --------- --------- --------- --------- --------- --------- D
�.p�At �P:
--------------- --------- t ------------------------------ t -------------------- --------- 1 --------- --------- --------- --------- --------- --------- --------- L --- -------
------ LL 35.Mtt ---- --
_-'__Dia 15 ODih
Fl.pv 0 029� ftM
--- - - -------- I -------- --------- -4 --------- ---------
---------- I -------- I ---------- T --------- --------- --------- ------- . I ------ -------------- -jp -1,�,wjj 4-f,�A? if
------------------ i ---------- L ------------------- ---------- L --------- --------- --------- --------- --------------- -------- --------- ------- ------- tn 7T,76,f 42t60 H' ----•---
H- ----- ------------------ ------------------------------ ----------------------- Sla- 130= tA --- L --------- ------- L --------- ------- -------- L --------- Inve---------
Ur, rt
o6o -d --------- ------
- ------ ------ ------ -------------------------- .................. n _ _ver: 41 ............. ....... .......
: ......... ------------------- ---- ---- - ------ --------
S T E W A R T
w Inver1425Stcpa
wp
_Qn
----- ------------------ -------- --------- --------- -------------------------- -------------------------- -----------------------------I --------
T------------------------------ T --------- --------- --------- --------- --------- --------- --------- --- --- --------- ------
----- ------ - -------- I ------ ------- ------ ------ ---------- ---------
--- -------------------------- ----------------------------- -------------------- --------- --------- --------- --------- --------- I --------- L --------- --------- I --------- L --------- --------- ----
--- -------- -------- --------- --------- -------- --------- --------- ----------------- ---------- --------- --------- --------- --------- 4 ---------- --------- --------- --------- --------- ---------
------------------ ---------- L -------- --------- --------- ------ --------- --------- --------- --------- --------- --------- ---------
--- --------- I ------------------ T --------- ------ 4 --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- ---------
--- ------- ------- -------- --------- --------- --------- ------------------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- ---------
---- -------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- ---------
----------------------------- --------- 4 --------- --------- --------- --------- --------- --------- --------- ------------------ --------- --------- --------- --------- --------- ---------
---- - ------ --------- --------- ------ ------ ---- - ------ ------------------ ----
---- ------ ----------------------------- -------------------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- ---------
T----------------------------- ---------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- ---------
------------------ --------- ------------------- T --------- r ------------------- 1 --------- r ------------------- i --------- r ------------------- i --------- 7 ------------------- i --------- 7 ------------------- i --------- r ------------
---------- -------- ----- --- -- ------ --------- --------- --------- ---- ---- -- ------ --------- --------- --------- ---- ---- - ------ --------- --------- ------ -- ---- ---- - ------ --------- ---------
----------------------------- --------- --------
----------------------------- --------- ---------
I+cc 1+10 1+20 1-30 1+40 1+50 1-60 1-70 1-80 1-90 2+00 2-10 2-20 2-30 2+40 2-50 2-60 2+70 2+80 2-90 3-00 3+10 3+20 3-30 3.40
Stat— (ft)
45 CD2
50 AD 45 CD 52 -CD
424.00
427.00 42990 429.89
41713
42350 42467 42501
41875
42414 42523 425.67
(Storm P,.pH3 P
(Storm F,.p1.44 P
(Storm Pmp}45 P
17923
35.78
2399
15.00
15.00
15.00
0.0307
0.0299
0.01 00
42350
42467
42501
41800
42360
42477
550
324
241
822
6.20
419
0.69
055
059

2S YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER
446.5
446
445 5
445
4445
444
443 5
443
4425
442
441.5
441
440.5
440
439.5
439
438.5
438
437.5
437
436.5
436
435.5
435
4345
434
4335
433
4325
432
431 5
431
4305
430
429.5
429
428.5
Node ID
Rim [IQ
Min Pipe Cover [It].
Max HGL [It].
Link ID:
Length [It]'
Dia ]in]
Slope pVIQ
Up Invert [It]:
Dn Invert [It]:
Max 4 [ds7:
Max Vel [ft
Max Depth [It]:
25 year HGL
N orth Carolina Agricultural Sciences Center
S T E W A R T
ost South Outfall
---------------
-RI
---------------
73 AD
439.00
_____•______'_______'_ _______`_ •_ - `_ _______`______'______ 'W --------------- ------ ---- --- ------- --------- -------------- ------ ------------- ------ ______
C
------ ----
------------------------------
-- - _______ -------------
------
429.62
433.29
434.02
...................... ......... .......�..... .. ....... ...... ...... ..... ....., .... ...... .....
_____________________'_______'____°`_____________________________�______
___--------------
... ...
------
....-------
_---- ___------------------------------- _____________________
----------
- ____________
430.57
.....
437.01
439.90
X
a �
p......� ......'�
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�H.....�...... ,.......��......' .... v
3.......�......
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72
.... ....
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------------- -
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a r..
52.74
Up I(I wqA 437,73 It
24.00
18.00
. .. ..
. ...... .. ..
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18.00
�
.. . .
.... .. .. .. ..
... ... .
.....,......�..... _.........------ L.............-....._--......,..
---------------
0.0166
....-------
_......., -----
0.0100
-------------
433.29
---�-
...........{.......�..............�.... Ljr� .....
10.EXR'-------------- ..... �...
Link ID �'0-P ..
;....... .......Len
Dn lriveH 435.'22ft
.... .....
............s........ ...... ------..........
429.62
433.39
435.22
.....
....... ........
h 5318 k
n.............
, :.
14.75
13.67
,
4.44
-------
PIE
8.44
7.73
4.17
.------.. ,.......5... y_q 0.0342 .... .......'
�------.r______ 34-.62* ---
invek4 .....��
1.50
1.50
...............'______;_______3
DI eH 433.28
v:______'_ _______'_ p__ ______ - '_ _______'__________
- _- -
---------
________'______0, n{nveH ____
______ _______ ______ _______
---- ------
------- --- ______ _______
-------
D n eH
------ -----------
----------------------43339-- ---
N
1+00 1+10 1+20 1+30 1+40 1+50 1+60 1+70 1+80 1+90 2+00 2+10 2+20 2+30 2+40 2+50 2+60 2+70 2+8D 2+9D 3+00 3+10 3+20 3+30 3+40 3+50
3+60 3+7D
3+80 3+90 4+00
4+10 4+20
Station [ft]
ost South Outfall
70 1711
-RI
72J0
73 AD
439.00
439.00
442.90
440.00
429.62
433.29
434.02
436.70
437.73
413
430.57
434.45
437.01
439.90
440.00
EXP
70 P
72
P
PIPE 73
107.19
63.18
89.00
52.74
24.00
18.00
18.00
18.00
0.0342
0.0100
0.0166
0.0100
433.29
434.02
436.70
437.73
429.62
433.39
435.22
437.20
1905.
14.75
13.67
4.44
11.33
8.44
7.73
4.17
1.05
1.44
1.50
1.50

2S YR HGL STUDY - NORTH CAROLINA AGRICULTURAL SCIENCES CENTER
25 year HGL
North Carolina Ag,-1t,,ral Sciences Center
S T E W A R T
446.5
......:......... :.........-..........--------- ;--------- .--------- :--------- ---------- ---------- ......... ........ -, ......... .........-------------
N .........
nH
-.........F.........
F
m u
446
------ _-----
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---------- --------------------- ---------------
__________------------ -----------
a u
_ ------------------
--------- _________•_________
e
445.5
445
______•___________________'__________'_________�---------
•_-------------------------------------- --------------- ------------------- -- --------- ________
-----------------
________
------------ _________•--------------
----v
d L
- -
aaas
------ '---------
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'--------- •--�-'u" -------------------
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---
444
0.
.---N �.. v.....
�..........�.........
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;.........�
s
.........�.........�. v ro...;
.�------------------
�'
.... .. ......... ......... .----
-----------------
Link lD jStorm _pr'op7.60.P
...
.,---------
..... ...
58.28
o
18.00
15.00
15.00
Length 58.26 ft
0.0060
443.6
.... c' �o.m
woo
............... p) -........ �.........
..........--.............................:---------------------
Link lD 51prm-Pro fit P -
�.
;--------- --------- A
d ? ___
�.ry........... �'
��'�DLen91h 63.f�fl6,
.... C P oP}. .P ....................
......... �.........
Dia 15.0
.�5� RM ... . ..........
OD0647n
..... �..
749
L englh 10467 R
217
Dia 15001n
2.64
;Up Inve0 441.56 ft
� 443
.... �' 'a-
96ti30 in, ...--------- .---------------------
.--------- .----
.... ..................
��IePeO!]O6F}HNt.......................
...........
... ...
m
d
Slope', 00060 rtm
Up Invert 441:11 ft
442.5
m
m442-----
....x
a.:.
..... :....................... ...11Altwe[i440fi3.H' --------------------------------------
- 00 ft'
'--------- '--------- '--------
...:....-----.........
'I
Dn Invert 440:7311......:.........,......
---
...
`-
4416
441
-----
-----'--- ---'---------------
- `---------i-------------
4405
aao------------------------------------------+------------------a---------'•-------------------------------------;--------------------I---------
-----
-----
--------'
--------------------------
--------- --------
--------------------
--------- ------ -T---------
---
--- -----
439.5
439
4385
.....-------
---------------------------------------------------------------
------ 1-----
.--------- .---------- L --------- L --------- .--------- I
--------- ----------
_--- 1_________1__________I__________L
--------
--------------------------------------------------
_________________--------- _------ ____--- _----- --------------------
--- ----- -----
- ------------------------------------
_------ ____--- _----- --------
------ ------
--------------------
_-----------------
----- ----- -----
--------- --------- ---------
____--- _----- ------ __--------
------
--- ....
_ .....____
I
1+00
1+10 1+20 1+30 1+40 1+50 1+60 1+70
1+80 1+90 2+00 2+10 2+20
Station [ft]
2+30 2+40 2+50 2+60
2+70 2+80
2+90 3+00 3+10
3+20 3+30
Node ID
Rim [IQ
Min Pipe Cover [It].
Max HGL [It].
Link ID:
Length [It]'
Dia in
Slope pVIQ
Up Invert [It]:
Dir Invert [It]:
Max 4 [ds7:
Max Vel [ftls7:
Max Depth [It]:
FRONTBIO
61 AD
62 CD
GRD442.00
442.83
445.11
444.84
439.00
440.63
441.11
441.56
2.03
441.04
441.95
442.14
442.34
{Storm Prop7.62-F
{Storm Prop}.61-P
{Storm-Prop7.60
F
104.67
63.86
58.28
18.00
15.00
15.00
0.0060
0.0060
0.0060
440.63
441.11
441.56
440.00
440.73
441.21
749
298
217
4.84
2.64
2.86
1.17
1.13
0.83

Appendix 7
Seasonally High Water Table Report

dECOLOGICAL
ENGINEERING
July 4, 2017
Ms. Jennifer Wagner, PLA, ASLA, LEEP AP
Stewart, Inc.
421 Fayetteville Street, Suite 400
Raleigh, NC 27601
Re: Seasonal High Water Table (SHWT) Evaluation
NC Agricultural Center
Raleigh, Wake County, NC
Ms. Wagner:
1151 SE Cary Parkway, Suite 101
Cary, North Carolina 27518
[phone]
www.ecologicaleng.com
Ecological Engineering, LLP (Ecological Engineering) appreciates the opportunity to provide this Seasonal
High Water Table (SHWT) evaluation with regard to the proposed BMPs at the abovementioned site.
The project site is situated near at the intersection of Edwards Mill Rd. and Reedy Creek Rd. in Raleigh
(Figure 1). Ecological Engineering utilized information provided by Stewart, to locate the soil borings for
the SHWT determination. Two areas were hand-augered to review and determine the SHWT.
Assessments were conducted by Heather Smith, LSS, on July 4, 2017. The following information
summarizes the results of our evaluation.
Existing Conditions and Area of Evaluation
The current landuse surrounding Hole # 1 is a maintained lawn with clover and fescue and Hole # 2 is an
active cattle pasture. The holes were dug within the footprints of the proposed BMPs (Figure 2).
According to the Soil Survey of Wake County, NC (Cawthorn, 1970) and current data on the USDA Web
Soil Survey, the underlying soil at Hole #1 is Appling sandy loam with 2 to 6 percent slopes and the soil at
Hole # 2 is Cecil gravelly sandy loam with 6 to 10 percent slopes. These soils are well drained with a
subsoil of clay with moderate permeability. Appling and Cecil soils have moderate to rapid runoff. These
soil series occur on ridges and side slopes in uplands within the Piedmont of North Carolina.
Results
The following information describes the soils encountered at the boring location. Our assessments
followed and were consistent with Rule 1942 (NCAC.2004) which states "a soil wetness condition shall
be determined by the indication of colors of chroma 2 or less (Munsell Color Charts) at > 2% of soil
volume or a soil wetness condition shall also be determined by periodic direct observation or indication
of saturated soils or a perched water table, or lateral water movement flowing into a bore hole
monitoring well, or open excavation above a less permeable horizon or horizon subdivision that may
occur without the presence of colors of chroma 2 or less". Please be advised the auger method for visual
field assessment by soil color can be an inaccurate assessment of the actual SHWT. The percentage of
SHWT indicators is difficult to determine. The use of a pit provides a greater degree of accuracy.
Ecological Engineering, LLP Project No. 10502-197 Page 1 of 2

Le novo BMP Seasonal High Water Table determination
February 2017
Soil Boring #I
Soil Boring # 1 was taken approximately 120 feet to the southwest of the paved parking lot (Figure 2).
The soil profile did not exhibit signs of disturbance and appeared to be in a natural condition. Please see
attached Soil Profile Description 1 for detailed soil color information. The soil did not exhibit any layers
with > 2% low chroma to a depth of 6'. The hole was terminated at 6' due to a restrictive layer. Based
on the lack of low chroma within the soil profile the SHWT is greater than 6` for this hole.
In conclusion, the SHWT within the evaluated portion of the site is greater than 6'.
Soil Boring #2
Soil Boring # 2 was taken approximately at latitude 35.816161 and longitude -78.711897 (Figure 2). The
soil profile did not exhibit signs of disturbance and appeared to be in a natural condition. Please see
attached Soil Profile Description 2 for detailed soil color information. The soil did not exhibit any layers
with > 2% low chroma. Based on the lack of low chroma within the soil profile the SHWT is greater than
10' for this hole.
In conclusion, the SHWT within the evaluated portion of the site is greater than 10'.
If you have any questions or concerns, please do not hesitate to contact me via phone at [phone]
or via email at hsmith P ecol❑ icalen .com.
Sincerely,
ECOLOGICAL ENGINEERING, LLP
11 —
Heather Smith, LSS
Project Scientist
cc: File 10502-197
References Cited;
15A NCAC 18A.1942 (2004).
Cawthorn, Joel, W. 1970. Soil Survey of Wake County, North Carolina. USDA Soil Conservation Service in
cooperation with the NC Agricultural Experiment Station.
US Department of Agriculture, Natural Resources Conservation Service. 2017. Web Soil Survey. Available
at: www.websoilsur-vey.nres.usda.gov/app.
Ecological fngineering, LLP Project No. 10502-197 Page 2 of 2

ECOLOGICAL
ENGINEERING
Client
Project Name
County
Location
Mapped Soil Series
Soil Classification
Actual WT
Vegetation
Soil Profile Description
Stewa rt
Date
7/4/2017
Texture
EE
0-5
NC Ag Center
Project #
10502-197
Wake
State
NC
Reedy Creek Rd./Edwards Mill Rd., Raleigh, NC
Boring ID
Hole # 1
Appling sandy loam
5YR 6/8
Fine, kaolinitic, thermic Typic Kanhapludults
gravel
30-35
>6' SH WT >6'
Slope
2-6%
Clover/Lawn Drainage Well Drained
Latitude
35.814056
Boring Depth 61
Restrictive
Reason Layer Longitude -78.712249
Depth
(in)
Matrix Color
Mottles
Texture
Notes
0-5
7.5YR 4/4
sandy loam
5-15
2.5YR 4/8
clay
15-30
5YR 6/8
loamy clay
gravel
30-35
SYR 5/3
loamy clay
SYR 6/6
SYR 5/8
35-40
2.5Y 5/3
10YR 6/8 (20%)
clay loam
Didn't meet chroma 2
requirement for a call for SHWT
40-48
1 10YR 5/8
clay
48-54
10YR 5/8
2.5YR 4/8 {10%)
clay
54-72
2.5YR 4/8
clay
10YR 5/8
Comments: The soil didn't meet the requirement for a chroma 2 in the upper 40" of the soil. During the site visit the soil
was dry to touch and the last rain was 7/3/17, approximately 0.05". This area may have increased soil moisture during
the winter and spring months. Hit a restrictive layer at 6', possibly bedrock. Appling soils have bedrock at a depth
ranging from 6' to 10'. �,�•..�
LSS Seal and Signature:
Date: 7 —� — f

ECOLOGICAL
ENGINEERING
Client
Project Name
County
Location
Mapped Soil Series
Soil Classification
Actual WT
Vegetation
Boring Depth
Soil Profile Description
5tewa rt
Date
7/4/2017
Texture
EE
0-6
NC Ag Center
Project #
10502-197
Wake
State
NC
Reedy Creek Rd./Edwards Mill Rd., Raleigh, NC
Boring I❑
Hole # 2
Cecil, gravelly sandy loam
2.5YR 4/8
Fine, kaoIinitic, thermic Typic KanhapIuduIts
45-60
510' SHWT X10'
Slope
6-10%
Pasture Drainage Well Drained
Latitude
35.816161
10' Reason Auger Length
Longitude
-78.711897
Depth
(in)
Matrix Color
Mottles
Texture
Notes
0-6
10YR 4/3
sandy loam
6-10
5YR 5/8
sandy clay
10-45
2.5YR 4/8
clay
45-60
2.5YR 4/8
5YR 5/8 (5%)
clay
Mica present
60-80
2.5YR 4/8
loam saprolite
Mica present
2.5Y 7/4
7.5YR 5/6
80-120
10114/3
loam saprolite
Mica present
2.5YR 6/8
5YR 7/8
Comments: The soil didn't exhibit characteristics of a SHWT within 10' of the soil surface.
LSS Seal and Signature: SOIL
❑IL 5C1 Date: f
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look
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o
x
u
a
w
M7
e
DIS T1?1IC DR
0 500 1,000 2,000
Feet
Prepared By: Prepared For:
~ ECGLGGICAL
ENGINEERING STEWART
N
INAgpE Ar V
DR.
__ HA RDEAV RD.
Figure 1
Seasonal High Water Table Determination
Vicinty Map
NC Agricultural Center
Wake County, NC
July 2017
2013 USGS Quadrangle Raleigh West
H
-
�
M

Legend,.
Q Proposed BMP
% py •,a, • � A. 1
Hole # 2 `
� - •9 1.11--1 17
,77W
_ €d
1p
� . Hole # 1 �:�•. ''��. �' _ s
" r ,.� r , Ir► ';. DRQ~ � �. � •��� _ �� ,�'
ff
;'� reek •>� ,�� �� n N, � �1'��r �= j- �.
. r 5 •� . - ri.s • j. , ..,u.
0 150 300 600
Feet " �` ='' �
#.r
Prepared By: Prepared For: Figure 2
Seasonal High Water Table Determination N
Boring Locations
r-Aj NC Agricultural Center
ECOLOGICAL Wake County, NC
ENGINEERING STEWARTI
July 2017
2013 NC Onemap Aerials