Full Report - 2018-01-12

STORMWA TER MANA GEMENT CAL CULA TIONS
QUINTESSA CLUBHOUSE
For
R.D. Harrell Company
EN G I N GE R I N G
�4f *1000-
John H. Ross, P.E.
EAGLE ENGINEERING, INC.
2013A Van Buren Avenue
Indian Trail, NC 28079
Phone: [phone]
EEI PROJECT NO. 1610
January 12, 2018
Initials Date

Feet
0 50 100 200 300
Map projection: Web Mercator Comer coordinates: WCS84 Edge tics: UTM Zone 17N WGS84
USDA Natural Resources Web Soil Survey
Conservation Service National Cooperative Soil Survey
5/30/2017
Page 1 of 4
3
Hydrologic Soil Group—Union County, North Carolina
3
(Quintessa Aminity)
528240
528260 52M 528320 528340 528360 528380 528400 528x20 52BW 528460
528480 528500
35° 0'5Z' N
35° 0' 52" N
50
■ i Y•
�. Si •' f r S4
TaB
L..7-
4
B,B, Al'
fl
it
of be valid at this I -.
35° 0'46'N
35° 0'46"N
528240
528260 528M 528300 528320 528340 528360 528380 528400 528420 528440 528460
528480 528500
3
3
"
Map Scale: 1:1,230 if printed on A landscape (11" x 8.5") sheet.
Meters
$ N
0 15 30 60 9D
$
Feet
0 50 100 200 300
Map projection: Web Mercator Comer coordinates: WCS84 Edge tics: UTM Zone 17N WGS84
USDA Natural Resources Web Soil Survey
Conservation Service National Cooperative Soil Survey
5/30/2017
Page 1 of 4

Hydrologic Soil Group—Union County, North Carolina
(Quintessa Aminity)
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
1:24,000.
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: Union County, North Carolina
Survey Area Data: Version 16, Sep 20, 2016
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Feb 11, 2011—Feb
13, 2011
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 5/30/2017
� Conservation Service National Cooperative Soil Survey Page 2 of 4

Hydrologic Soil Group—Union County, North Carolina
Hydrologic Soil Group
Quintessa Aminity
Hydrologic Soil Group— Summary by Map Unit — Union County, North Carolina (NC179)
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
BaB
Badin channery silt
C
0.2
6.8%
loam, 2 to 8 percent
slopes
BdB2
Badin channery silty
C
1.7
47.1%
clay loam, 2 to 8
percent slopes,
moderately eroded
TaB
Tarrus gravelly silt loam,
B
1.6
46.1%
2 to 8 percent slopes
Totals for Area of Interest
3.5
100.0%
usDA Natural Resources Web Soil Survey 5/30/2017
Conservation Service National Cooperative Soil Survey Page 3 of 4

Hydrologic Soil Group—Union 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
Quintessa Aminity
usDA Natural Resources Web Soil Survey 5/30/2017
Conservation Service National Cooperative Soil Survey Page 4 of 4

Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.0142&...
NOAA Atlas 14, Volume 2, Version 3
Location name: Matthews, North Carolina, USA* d ��
Latitude: 35.0142°, Longitude: -80.6885-
Elevation: 590.95 ft- - ry
* source: ESRI Maps
** source: USGS
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)
1 2 5 10 25 50 100 200 500 1000
5 -min 0.418 0.494 0.573 0.632 0.698 0.744 0.786 0.823 0.865 0.896
(0.386-0.454) (0.455-0.538) (0.527-0.624) (0.579-0.686) (0.637-0.757) (0.676-0.806) (0.710-0.851) (0.740-0.892) (0.772-0.941) (0.792-0.975)
10 -min 0.668 0.790 0.918 1-.0-1-F-1 -.1 1.18 1.25 1.31 1.37 1.41
1(0.616-0.726)1(0.727-0.861)1(0.843-1.00) (0.926-1.10) 1 (1.01-1.21) 1 (1.08-1.28) 1 (1.13-1.35) 1 (1.17-1.42) 1 (1.22-1.49) 1 (1.25-1.54)
15 -min 0.835 0.994 1.16 1.28 1.41 1.50 1.58 1.65 1.72 1.77
(0.770-0.907) (0.914-1.08) 1 (1.07-1.26) 1 (1.29-1.53) (1.36-1.63) 1 (1.43-1.71) 1 (1.48-1.79) 1 (1.54-1.87) 1 (1.57-1.93)
30 -min 1.15 1.37 F -1-.6-5-1F-1 -85 2.09 2.26 2.42 2.56 2.74 2.87
(1.06-1.24) 1 (1.26-1.49) 1 (1.52-1.80) 1 (1.70-2.01) 1 (1.91-2.26) 1 (2.05-2.45) 1 (2.19-2.62) 1 (2.30-2.78) 1 (2.44-2.98) 1 (2.54-3.12)
60 -min 1.43 1.72 2.12 2.41 2.78 3.06 3.33 3.59 3.93 4.18
(1.32-1.55) 1 (1.58-1.88) 1 (1.94-2.30) 1 (2.21-2.62) 1 (2.54-3.01) 1 (2.78-3.32) 1 (3.01-3.61) 1 (3.23-3.90) 1 (3.51-4.28) 1 (3.70-4.56)
2 -hr 1.65 2.00 2.48 2.84 3.31 3.67 4.03 4.38 4.85 5.21
(1.51-1.81) (1.83-2.19) (2.26-2.71) (2.59-3.10) (3.01-3.61) (3.32-4.00) (3.62-4.39) (3.91-4.78) ( 4.29-5.29) ( 4.56-5.69)
3 -hr 1.75 2.12 2.64 3.05 3.60 4.03 4.47 4.92 5.54 6.02
(1.61-1.93) (1.94-2.33) 1 (2.41-2.90) 1 (2.77-3.34) 1 (3.26-3.93) 1 (3.63-4.40) 1 (4.00-4.87) 1 (4.37-5.36) 1 (4.85-6.04) 1 (5.22-6.58)
6 -hr 2.11 2.54] F -3-.17-]F-3-.6 7 4.34 4.88 5.43 6.01 6.80 7.42
(1.93-2.31) 1 (2.33-2.79) 1 (2.90-3.48) 1 (3.35-4.01) 1 (3.94-4.74) 1 (4.40-5.32) 1 (4.86-5.91) 1 (5.32-6.53) 1 (5.94-7.38) 1 (6.41-8.07)
12 -hr 2.49 3.01 3.77 4.38 5.23 5.91 6.63 7.37 8.43 9.28
(2.29-2.73) (2.76-3.31) (3.45-4.13) (4.00-4.80) (4.74-5.71) (5.32-6.44) (5.90-7.21) (6.49-8.02) ( 7.30-9.15) ( 7.93-10.1)
24 -hr 2.95 3.55 4.47 5.19 6.20 7.00 7.85 8.73 9.96 11.0
(2.72-3.19) 1 (3.29-3.86) 1 (4.13-4.84) 1 (5.69-6.71) (6.41-7.59) (7.16-8.51) (7.92-9.47) (8.99-10.8) (9.83-11.9)
2 -day 3.47 4.18 5.21 6.04 7.17 8.09 9.04 10.0 11.4 12.5
(3.21-3.76) 1 (3.87-4.54) 1 (4.82-5.66) 1 (5.57-6.54) 1 (6.59-7.77) 1 (7.41-8.77) (8.24-9.81) (9.11-10.9) (10.3-12.4) (11.2-13.7)
3 -day 3.68 4.42 5.48 6.33 7.51 8.45 9.43 10.4 11.9 13.0
(3.41-3.98) 1 (4.10-4.78) 1 (5.08-5.94) 1 (5.85-6.85) 1 (6.91-8.12) 1 (7.76-9.15) 1 (8.62-10.2) 1 (9.52-11.3) 1 (10.8-12.9) 1 (11.7-14.2)
4 -day 3.89 4.66 5.76 6.63 7.84 8.82 9.82 10.9 12.3 13.5
(3.61-4.19) 1 (4.33-5.03) 1 (5.34-6.22) 1 (6.13-7.16) 1 (7.23-8.47) 1 (8.10-9.53) 1 (9.00-10.6) 1 (9.92-11.8) 1 (11.2-13.4) 1 (12.2-14.7)
7 -day 4.50 5.37 6.54 7.48 8.78 9.82 10.9 12.0 3.
16 14.9
(4.20-4.82) (5.02-5.76) (6.11-7.02) (6.98-8.02) (8.16-9.42) (9.10-10.5) ( 10.1-11.7) ( 11.1-12.9) ( 12.4-14.7) ( 13.5-16.1)
10 -day 5.15 6.13 7.38 8.37 9.70 10.8 11.8 12.9 14.4 15.7
(4.83-5.51) (5.74-6.55) (6.90-7.89) (7.81-8.94) (9.03-10.4) (9.99-11.5) ( 11.0-12.7) ( 11.9-13.9) ( 13.3-15.5) ( 14.4-16.9)
20 -day 6.89 8.13 9.61 10.8 12.4 13.6 -1-4.-9-1F-1-6.-1-1F-17.9 19.2
(6.49-7.34) 1 (7.66-8.66) 1 (9.03-10.2) 1 (10.1-11.5) 1 (11.6-13.2) 1 (12.7-14.5) 1 (13.9-15.8) 1 (15.0-17.2) 1 (16.5-19.1) 1 (17.7-20.6)
30 -day 8.45 9.94 11.6--]F-l-2.8--]F-1-4.5-15.8 17.1 18.3 20.0 21.3
(7.98-8.96)
7.98 8.96) 1 (9.39-10.5) 1 (10.9-12.3) 1 (12.1-13.6) 1 (13.7-15.4) 1 (14.8-16.8) 1 (16.0-18.1) 1 (17.1-19.5) 1 (18.7-21.4) 1 (19.8-22.8)
45 -day 10.6 12.5 14.3 15.7 17.5 18.8 20.2 21.5 23.2 24.5
(10.1-11.2) 1 (11.8-13.1) 1 (13.5-15.0) 1 (16.5-18.3) (17.8-19.8) 1 (19.0-21.2) 1 (20.2-22.6) 1 (21.8-24.5) 1 (22.9-25.9)
60 -day 12.7 14.8 -16.7--]=F 20.2 21.6 23.0 24.4 26.2 27.5
(12.1-13 3) (14.1-15.5) (15.9-17.5) (19.2-21.1) (20.5 -22.7)]L(21.8 -24.2)]L(23.1-25.6) (24.7-27.5) (25.9-29.0)
Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for
a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not
checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
Back to Top
PF graphical
1 of 3 1/12/2018, 2:42 PM

Precipitation Frequency Data Server
25
C
L 20
I
https://hdsc.nws.noaa. gov/hdsc/pfds/pfds_printpage.html?lat=3 5.0142&...
PDS -based depth -duration -frequency (DDF) curves
Latitude: 35-0142', Longitude: -SO-5885°
C
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C
C
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7. 7. 7•
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— 45 -day
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1 2 5 10 25 50 100 200 500 1000
Average recurrence interval (years)
NOAA Atlas 14, Volume 2. Version 3 Created (GMT): Fri Jan 12 19:41:55 2019
Back to Top
Maps & aerials
Small scale terrain
,i
3km
2m!
Average recurrence
interval
(years)
— 1
2
— 5
14
25
50
100
200
500
1000
Duration
— 5-m1n
— 2 -day
— 10-n1n
— 3 -day
15 -min
— 4 -day
— 30 -mm
— 7 -day
-- 60 -min
10 -day
— 2 -ht
— 20 -day
— 3 -hr
— 30 -day
— G -hr
— 45 -day
— 12 -hr
— OD -day
— 24 -hr
2 of 3 1/12/2018, 2:42 PM

Precipitation Frequency Data Server
https://hdsc.nws.noaa. gov/hdsc/pfds/pfds_printpage.html?lat=3 5.0142&...
Large scale terrain
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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()noaa.gov
Disclaimer
3 of 3 1/12/2018, 2:42 PM

Project
Project #
Designation
Sand Filter
Quintess - Amenity - Prelim. Client Kahuna Group
1610 Date 5/30/2017
Sand Filter 1 Designer JLR
NC BMP Manual (NC Ordinance)
Water Quality Volume
Total Drainage Area 72,395 Square Feet 1.66 Acres
Impervious Area 26,002 Square Feet 0.60 Acres
Impervious Fraction 0.359 35.92 %
Runoff Coefficient 0.37
Rainfall Depth l�Inch(es)
WQVR 2252 Cubic Feet
WQVADJ 1689 Cubic Feet
EN A GERLIPE
2013A Van Buren Ave.
Indian Trail, NC 28079
Sand Filter Geometry
hMaxFilter hA
A, + AF
Minimum AS
150 Square Feet
0.5
0.25
3378
FORBAY
Qo 0.0261 CFS
1.0
0.50
1689
E 0.9000
1.5
0.75
1126
W 0.0004 FPS
2.0
1.00
844
2.5
1.25
676
Minimum AF
291 Square Feet
3.0
1.50
563
FILTER AREA
DF 1.5 Feet
3.5
1.75
483
K 3.5 Feet per Day
4.0
2.00
422
T 1.66 Days
4.5
2.25
375
hMaxFilter 1 Feet
5.0
2.50
338
hA 0.5 Feet
5.5
2.75
307
6.0
3.00
281
Minimum AS+AF
1689 Square Feet
hMaxFilter 1 Feet
Staged Storage
Summary
hA 0.5 Feet
Elevation
Area Volume
Accum. Vol.
590.00
3,088
0
0
Design A,
2588 Square Feet
591.00
4,334
3711
3711
Design AF
500 Square Feet
592.00
5,638
4986
8697
A,+ AF
3088 Square Feet
593.00
6,997
6318
15015
hMaxFilter
1
594.00
8,414
7706
22720
hA
0.5
WQVTreated
3711 Cubic Feet >_ 1689

Underdrain Calculation
Minimum Drawdown Rate= 0.0156 cfs
Where: Minimum Drawdown = V/(40 hrs)(3600 sec/hr)
Water Quality Volume Average Flow Rate Through Media (Qo)
WQv/tf=QO=Af(k)(hf+df)/(df))
where:
Af= surface area of filter bed 500 ft
z
df= filter bed depth (ft) 1.5 ft
k= coefficient of permeability of filter media (ft/day), (use 0.5 fl 3.5 ft/day
ha= average height of water above filter bed (ft), (Depth of cell/: 0.5 ft
Qo= 2,333 cfd
0.0270 cfs
10 * Qo= 0.2701 cfs -Safety factor of 10 for underdrain sizing
Number of Pipes Needed and Diameter:
N*D=16*((Qo*n)/s° 5)0.375
where:
N= number of pipes
D= diameter of pipes (in)
Qo= flow to be carried (cfs) = 0.0270 cfs
n= mannings coefficient = 0.011
s= slope of pipe (assume 0.5 0.005 ft/ft
N * D = 2.0553
N D (in.)
Therefore: 1 4 4 >_ 2.0553
-Only 4" or 6" diameter pipes shall be used
-NCDENR suggests a minimum of two (2) underdrain pipes be installed in case of clogging

Hydraflow Table of Contents Amenity BMP Prelim - 2017-05-30.gpw
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11 Friday, 01 / 12 / 2018
Watershed Model Schematic..................................................................................... 1
Hydrograph Return Period Recap............................................................................. 2
2 - Year
SummaryReport......................................................................................................................... 3
HydrographReports................................................................................................................... 4
Hydrograph No. 1, SCS Runoff, PRE....................................................................................... 4
Hydrograph No. 2, SCS Runoff, POST.................................................................................... 5
Hydrograph No. 3, Reservoir, POST ROUTED........................................................................ 6
10 - Year
SummaryReport......................................................................................................................... 7
HydrographReports................................................................................................................... 8
Hydrograph No. 1, SCS Runoff, PRE....................................................................................... 8
Hydrograph No. 2, SCS Runoff, POST.................................................................................... 9
Hydrograph No. 3, Reservoir, POST ROUTED...................................................................... 10
25 - Year
SummaryReport....................................................................................................................... 11
HydrographReports................................................................................................................. 12
Hydrograph No. 1, SCS Runoff, PRE..................................................................................... 12
Hydrograph No. 2, SCS Runoff, POST.................................................................................. 13
Hydrograph No. 3, Reservoir, POST ROUTED...................................................................... 14
50 - Year
SummaryReport....................................................................................................................... 15
HydrographReports................................................................................................................. 16
Hydrograph No. 1, SCS Runoff, PRE..................................................................................... 16
Hydrograph No. 2, SCS Runoff, POST.................................................................................. 17
Hydrograph No. 3, Reservoir, POST ROUTED...................................................................... 18
100 - Year
SummaryReport....................................................................................................................... 19
HydrographReports................................................................................................................. 20
Hydrograph No. 1, SCS Runoff, PRE..................................................................................... 20
Hydrograph No. 2, SCS Runoff, POST.................................................................................. 21
Hydrograph No. 3, Reservoir, POST ROUTED...................................................................... 22

Watershed Model Schematic Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
1 2
Project: Amenity BMP Prelim - 2017-05-30.gpw Friday, 01 / 12 / 2018

Hydrograph Return Period Recap
Hyd flow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd.
No.
Hydrograph
type
(origin)
Inflow
hyd(s)
Peak Outflow (cfs)
1 -yr 2 -yr 3 -yr 5 -yr 10 -yr T25 -yr 50 -yr 100 -yr
Hydrograph
Description
1
SCS Runoff
------
-------
1.726
-------
-------
3.543
4.751
5.740
6.808
PRE
2
SCS Runoff
------
-------
5.337
-------
-------
9.237
11.67
13.60
15.65
POST
3
Reservoir
2
-------
1.222
-------
-------
3.355
4.680
6.076
9.606
POST ROUTED
Proj. file: Amenity BMP Prelim - 2017-05-30.gpw
Friday, 01 / 12 / 2018

Hydrograph Summary Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd.
No.
Hydrograph
type
(origin)
SCS Runoff
Peak
flow
(cfs)
1.726
Time
interval
(min)
2
Time to
Peak
(min)
734
Hyd.
volume
(cult)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(cuft)
------
Hydrograph
Description
PRE
1
7,823
------
------
2
SCS Runoff
5.337
2
716
10,802
------
------
------
POST
3
Reservoir
1.222
2
724
8,739
2
594.57
4,793
POST ROUTED
Amenity BMP Prelim - 2017-05-30.gpw
Return Period: 2 Year
Friday, 01 / 12 / 2018

Hydrograph Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd. No. 1
PRE
Hydrograph type
= SCS Runoff
Storm frequency
= 2 yrs
Time interval
= 2 min
Drainage area
= 1.670 ac
Basin Slope
= 0.0%
Tc method
= TR55
Total precip.
= 3.55 in
Storm duration
= 24 hrs
" Composite (Area/CN) = [(0.320 x 74) + (1.350 x 74)] / 1.670
Q (cfs)
2.00
1.00
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
PRE
Hyd. No. 1 -- 2 Year
120 240 360 480 600 720 840 960
Hyd No. 1
4
Friday, 01 / 12 / 2018
= 1.726 cfs
= 734 min
= 7,823 cuft
= 74*
= Oft
= 31.10 min
= Type II
= 484
Q (cfs)
2.00
1.00
0.00
1080 1200 1320 1440 1560
Time (min)

Hydrograph Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd. No. 2
POST
Hydrograph type
= SCS Runoff
Storm frequency
= 2 yrs
Time interval
= 2 min
Drainage area
= 1.670 ac
Basin Slope
= 0.0%
Tc method
= User
Total precip.
= 3.55 in
Storm duration
= 24 hrs
" Composite (Area/CN) _ [(0.600 x 98) + (1.070 x 74)] / 1.670
Q (cfs)
6.00
5.00
e
3.00
2.00
1.00
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
POST
Hyd. No. 2 -- 2 Year
5
Friday, 01 / 12 / 2018
= 5.337 cfs
= 716 min
= 10,802 cuft
= 83*
= Oft
= 5.00 min
= Type II
= 484
Q (cfs)
6.00
5.00
4.00
3.00
2.00
1.00
0.00 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440
Hyd No. 2 Time (min)

Hydrograph Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd. No. 3
POST ROUTED
Hydrograph type
= Reservoir
Storm frequency
= 2 yrs
Time interval
= 2 min
Inflow hyd. No.
= 2 - POST
Reservoir name
= Dry Detention Basin
Storage Indication method used.
Peak discharge
Time to peak
Hyd. volume
Max. Elevation
Max. Storage
POST ROUTED
1
Friday, 01 / 12 / 2018
= 1.222 cfs
= 724 min
= 8,739 cuft
= 594.57 ft
= 4,793 cuft
Q (cfs) Hyd. No. 3 -- 2 Year Q (cfs)
6.00 6.00
5.00 5.00
4.00 4.00
3.00 3.00
2.00 2.00
1.00 1.00
0.00 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 1680
Time (min)
Hyd No. 3 Hyd No. 2 Total storage used = 4,793 cuft

Hydrograph Summary Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd.
No.
Hydrograph
type
(origin)
SCS Runoff
Peak
flow
(cfs)
Time
interval
(min)
2
Time to
Peak
(min)
734
Hyd.
volume
(cult)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(cuft)
------
Hydrograph
Description
PRE
1
3.543
15,447
------
------
2
SCS Runoff
9.237
2
716
19,019
------
------
------
POST
3
Reservoir
3.355
2
724
16,907
2
595.36
7,935
POST ROUTED
Amenity BMP Prelim - 2017-05-30.gpw
Return Period: 10 Year
Friday, 01 / 12 / 2018

Hydrograph
Report
8
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd. No. 1
PRE
Hydrograph type = SCS Runoff Peak discharge
Storm frequency = 10 yrs Time to peak
Time interval = 2 min Hyd. volume
Drainage area = 1.670 ac Curve number
Basin Slope = 0.0% Hydraulic length
Tc method = TR55 Time of conc. (Tc)
Total precip. = 5.19 in Distribution
Storm duration = 24 hrs Shape factor
" Composite (Area/CN) _ [(0.320 x 74) + (1.350 x 74)] / 1.670
PRE
Q (Cfs) Hyd. No. 1 -- 10 Year
Friday, 01 / 12 / 2018
= 3.543 cfs
= 734 min
= 15,447 cuft
= 74*
= 0 ft
= 31.10 min
= Type II
= 484
Q (Cfs)
4.00
4.00
3.00
3.00
2.00
2.00
1.00
1.00
0.00 -
0 120 240 360 480 600 720 840
Hyd No. 1
960 1080 1200
- 0.00
1320 1440 1560
Time (min)

Hydrograph Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd. No. 2
POST
Hydrograph type
= SCS Runoff
Storm frequency
= 10 yrs
Time interval
= 2 min
Drainage area
= 1.670 ac
Basin Slope
= 0.0%
Tc method
= User
Total precip.
= 5.19 in
Storm duration
= 24 hrs
" Composite (Area/CN) _ [(0.600 x 98) + (1.070 x 74)] / 1.670
Q (cfs)
10.00
M
4.00
2.00
0.00 ' '
0 120 240
Hyd No. 2
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
POST
Hyd. No. 2 -- 10 Year
360 480 600 720 840
Friday, 01 / 12 / 2018
= 9.237 cfs
= 716 min
= 19,019 cuft
= 83*
= Oft
= 5.00 min
= Type II
= 484
Q (cfs)
10.00
M
4.00
2.00
0.00
960 1080 1200 1320
Time (min)

Hydrograph Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd. No. 3
POST ROUTED
Hydrograph type
= Reservoir
Storm frequency
= 10 yrs
Time interval
= 2 min
Inflow hyd. No.
= 2 - POST
Reservoir name
= Dry Detention Basin
Storage Indication method used.
Q (cfs)
10.00
M
4.00
2.00
0.00 ' 1'
0 120 240
Hyd No. 3
Peak discharge
Time to peak
Hyd. volume
Max. Elevation
Max. Storage
POST ROUTED
Hyd. No. 3 -- 10 Year
360 480 600
Hyd No. 2
720
10
Friday, 01 / 12 / 2018
= 3.355 cfs
= 724 min
= 16,907 cuft
= 595.36 ft
= 7,935 cuft
Q (cfs)
10.00
4.00
2.00
0.00
840 960 1080 1200 1320 1440 1560
Time (min)
Total storage used = 7,935 cuft

11
Hydrograph Summary Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd.
No.
Hydrograph
type
(origin)
SCS Runoff
Peak
flow
(cfs)
4.751
Time
interval
(min)
2
Time to
Peak
(min)
732
Hyd.
volume
(cult)
Inflow
hyd(s)
Maximum
elevation
(ft)
------
Total
strge used
(cuft)
------
Hydrograph
Description
PRE
1
20,585
------
2
SCS Runoff
11.67
2
716
24,309
------
------
------
POST
3
Reservoir
4.680
2
722
22,165
2
595.75
9,713
POST ROUTED
Amenity BMP Prelim - 2017-05-30.gpw
Return Period: 25 Year
Friday, 01 / 12 / 2018

Hydrograph Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd. No. 1
PRE
Hydrograph type
= SCS Runoff
Storm frequency
= 25 yrs
Time interval
= 2 min
Drainage area
= 1.670 ac
Basin Slope
= 0.0%
Tc method
= TR55
Total precip.
= 6.20 in
Storm duration
= 24 hrs
" Composite (Area/CN) = [(0.320 x 74) + (1.350 x 74)] / 1.670
Q (cfs)
5.00
4.00
3.00
2.00
1.00
0.00
0 120 240
Hyd No. 1
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
PRE
Hyd. No. 1 -- 25 Year
360 480 600 720 840
12
Friday, 01 / 12 / 2018
= 4.751 cfs
= 732 min
= 20,585 cuft
= 74*
= Oft
= 31.10 min
= Type II
= 484
Q (cfs)
5.00
4.00
3.00
2.00
1.00
0.00
960 1080 1200 1320 1440 1560
Time (min)

Hydrograph Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd. No. 2
Time to peak
POST
Hyd. volume
Hydrograph type
= SCS Runoff
Storm frequency
= 25 yrs
Time interval
= 2 min
Drainage area
= 1.670 ac
Basin Slope
= 0.0%
Tc method
= User
Total precip.
= 6.20 in
Storm duration
= 24 hrs
" Composite (Area/CN) _ [(0.600 x 98) + (1.070 x 74)] / 1.670
Q (cfs)
12.00
10.00
4.00
2.00
13
Friday, 01 / 12 / 2018
Peak discharge
= 11.67 cfs
Time to peak
= 716 min
Hyd. volume
= 24,309 cuft
Curve number
= 83*
Hydraulic length
= 0 ft
Time of conc. (Tc)
= 5.00 min
Distribution
= Type II
Shape factor
= 484
POST
Hyd. No. 2 -- 25 Year
Q (cfs)
12.00
10.00
4.00
2.00
0.00 ' ' ' ' ' 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320
Hyd No. 2 Time (min)

Hydrograph
Report
14
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Friday, 01 / 12 / 2018
Hyd. No. 3
POST ROUTED
Hydrograph type
= Reservoir
Peak discharge
= 4.680 cfs
Storm frequency
= 25 yrs
Time to peak
= 722 min
Time interval
= 2 min
Hyd. volume
= 22,165 cuft
Inflow hyd. No.
= 2 - POST
Max. Elevation
= 595.75 ft
Reservoir name
= Dry Detention Basin
Max. Storage
= 9,713 cuft
Storage Indication method used
Q (cfs)
12.00
10.00
2.00
0.00
0 120 240
Hyd No. 3
POST ROUTED
Hyd. No. 3 -- 25 Year
Q (cfs)
12.00
10.00
4.00
2.00
_ _ 0.00
360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)
Hyd No. 2 Total storage used = 9,713 cuft

15
Hydrograph Summary Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd.
No.
Hydrograph
type
(origin)
SCS Runoff
Peak
flow
(cfs)
5.740
Time
interval
(min)
2
Time to
Peak
(min)
732
Hyd.
volume
(cult)
Inflow
hyd(s)
Maximum
elevation
(ft)
------
Total
strge used
(cuft)
------
Hydrograph
Description
PRE
1
24,810
------
2
SCS Runoff
13.60
2
716
28,574
------
------
------
POST
3
Reservoir
6.076
2
722
26,405
2
596.03
10,993
POST ROUTED
Amenity BMP Prelim - 2017-05-30.gpw
Return Period: 50 Year
Friday, 01 / 12 / 2018

Hydrograph Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd. No. 1
PRE
Hydrograph type
= SCS Runoff
Storm frequency
= 50 yrs
Time interval
= 2 min
Drainage area
= 1.670 ac
Basin Slope
= 0.0%
Tc method
= TR55
Total precip.
= 7.00 in
Storm duration
= 24 hrs
" Composite (Area/CN) = [(0.320 x 74) + (1.350 x 74)] / 1.670
Q (cfs)
6.00
5.00
K
3.00
2.00
1.00
0.00 '
0 120 240
Hyd No. 1
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
PRE
Hyd. No. 1 -- 50 Year
16
Friday, 01 / 12 / 2018
= 5.740 cfs
= 732 min
= 24,810 cuft
= 74*
= Oft
= 31.10 min
= Type II
= 484
Q (cfs)
6.00
5.00
4.00
3.00
2.00
1.00
0.00
360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)

Hydrograph Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd. No. 2
Time to peak
POST
Hyd. volume
Hydrograph type
= SCS Runoff
Storm frequency
= 50 yrs
Time interval
= 2 min
Drainage area
= 1.670 ac
Basin Slope
= 0.0%
Tc method
= User
Total precip.
= 7.00 in
Storm duration
= 24 hrs
" Composite (Area/CN) _ [(0.600 x 98) + (1.070 x 74)] / 1.670
Q (cfs)
14.00
12.00
10.00
1S
.M
4.00
2.00
17
Friday, 01 / 12 / 2018
Peak discharge
= 13.60 cfs
Time to peak
= 716 min
Hyd. volume
= 28,574 cuft
Curve number
= 83*
Hydraulic length
= 0 ft
Time of conc. (Tc)
= 5.00 min
Distribution
= Type II
Shape factor
= 484
POST
Hyd. No. 2 -- 50 Year
Q (cfs)
14.00
12.00
10.00
t-luslil
4.00
2.00
0.00 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320
Hyd No. 2 Time (min)

18
Hydrograph Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Friday, 01 / 12 / 2018
Hyd. No. 3
POST ROUTED
Hydrograph type
= Reservoir
Peak discharge
= 6.076 cfs
Storm frequency
= 50 yrs
Time to peak
= 722 min
Time interval
= 2 min
Hyd. volume
= 26,405 cuft
Inflow hyd. No.
= 2 - POST
Max. Elevation
= 596.03 ft
Reservoir name
= Dry Detention Basin
Max. Storage
= 10,993 cuft
Storage Indication method used
Q (cfs)
14.00
12.00
10.00
1S
.M
4.00
2.00
POST ROUTED
Hyd. No. 3 -- 50 Year
Q (cfs)
14.00
12.00
10.00
IS
4.00
2.00
0.00 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)
Hyd No. 3 Hyd No. 2 Total storage used = 10,993 cuft

19
Hydrograph Summary Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd.
No.
Hydrograph
type
(origin)
SCS Runoff
Peak
flow
(cfs)
6.808
Time
interval
(min)
2
Time to
Peak
(min)
732
Hyd.
volume
(cult)
Inflow
hyd(s)
Maximum
elevation
(ft)
------
Total
strge used
(cuft)
------
Hydrograph
Description
PRE
1
29,411
------
2
SCS Runoff
15.65
2
716
33,158
------
------
------
POST
3
Reservoir
9.606
2
722
30,961
2
596.18
11,724
POST ROUTED
Amenity BMP Prelim - 2017-05-30.gpw
Return Period: 100 Year
Friday, 01 / 12 / 2018

Hydrograph Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd. No. 1
PRE
Hydrograph type
= SCS Runoff
Storm frequency
= 100 yrs
Time interval
= 2 min
Drainage area
= 1.670 ac
Basin Slope
= 0.0%
Tc method
= TR55
Total precip.
= 7.85 in
Storm duration
= 24 hrs
" Composite (Area/CN) = [(0.320 x 74) + (1.350 x 74)] / 1.670
Q (cfs)
7.00
.M
5.00
4.00
3.00
2.00
0.00 ' '
0 120 240
Hyd No. 1
Peak discharge
Time to peak
Hyd. volume
Curve number
Hydraulic length
Time of conc. (Tc)
Distribution
Shape factor
PRE
Hyd. No. 1 -- 100 Year
20
Friday, 01 / 12 / 2018
= 6.808 cfs
= 732 min
= 29,411 cuft
= 74*
= Oft
= 31.10 min
= Type II
= 484
Q (cfs)
7.00
M
5.00
4.00
3.00
2.00
1.00
I I I I I I I I t I 0.00
360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)

Hydrograph Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Hyd. No. 2
Time to peak
POST
Hyd. volume
Hydrograph type
= SCS Runoff
Storm frequency
= 100 yrs
Time interval
= 2 min
Drainage area
= 1.670 ac
Basin Slope
= 0.0%
Tc method
= User
Total precip.
= 7.85 in
Storm duration
= 24 hrs
" Composite (Area/CN) _ [(0.600 x 98) + (1.070 x 74)] / 1.670
POST
21
Friday, 01 / 12 / 2018
Peak discharge
= 15.65 cfs
Time to peak
= 716 min
Hyd. volume
= 33,158 cuft
Curve number
= 83*
Hydraulic length
= 0 ft
Time of conc. (Tc)
= 5.00 min
Distribution
= Type II
Shape factor
= 484
Q (cfs) Hyd. No. 2 -- 100 Year Q (cfs)
18.00 18.00
15.00 15.00
12.00 12.00
9.00 9.00
6.00 6.00
3.00 3.00
0.00 0.00
0 120 240 360 480 600 720 840 960 1080 1200
Hyd No. 2 Time (min)

Hydrograph
Report
22
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v11
Friday, 01 / 12 / 2018
Hyd. No. 3
POST ROUTED
Hydrograph type
= Reservoir
Peak discharge
= 9.606 cfs
Storm frequency
= 100 yrs
Time to peak
= 722 min
Time interval
= 2 min
Hyd. volume
= 30,961 cuft
Inflow hyd. No.
= 2 - POST
Max. Elevation
= 596.18 ft
Reservoir name
= Dry Detention Basin
Max. Storage
= 11,724 cuft
Storage Indication method used
POST ROUTED
Q (cfs) Hyd. No. 3 -- 100 Year Q (cfs)
18.00 18.00
15.00 15.00
12.00 12.00
9.00 9.00
6.00 6.00
3.00 3.00
0.00 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)
Hyd No. 3 Hyd No. 2 Total storage used = 11,724 cuft

Rip Rap Apron Design
Project: QUintessa, Phase 2 Amenity
Structure: BMP Outlet FES -1
30
Outlet W = 00 + La
pipe
diameter [tin}
ilwater c 0.50a
PQ
�r4t Eau F .
F
50 100
Discharge (ft3lseo)
Curves may not be extrapolated.
Figure B.D6a Design of outlet proteotion protection From a round pipe flowing full, minimum tailwater condilion (T. < 0.5 diameter).
EEI Project No. 5858
Rip Rap Apron Design
NCDENR Erosion and Sediment Control
Planning and Design Manual
Do =
18 in.
d50 (6"min.)= 6 in.
Q10 =
3.36 cfs
dmax = 9.00 in.
3D0 =
4.5 ft.
th= 13.50 in.
La =
8 ft.
W =
9.50 ft.
30
Outlet W = 00 + La
pipe
diameter [tin}
ilwater c 0.50a
PQ
�r4t Eau F .
F
50 100
Discharge (ft3lseo)
Curves may not be extrapolated.
Figure B.D6a Design of outlet proteotion protection From a round pipe flowing full, minimum tailwater condilion (T. < 0.5 diameter).
EEI Project No. 5858
Rip Rap Apron Design