20191305 Ver 1_SW Report_20191202

STORMWATER MANAGEMENT REPORT
FOR
NEW RETAIL STORE
U.S. HIGHWAY 64 / CASHIERS ROAD & CHERRYWOOD DR.
HIGHLANDS, NC
11-22-2019
PREPARED FOR
The
Group
Commercial Real Estate Development
216 Westsiae square • Huntsville, Al 35801
Phone:[phone] • Fax:[phone]

CONTENTS
I. PREDEVELOPMENT CONDITIONS............................................................................... I
II. ANALYSIS METHODS .................................................... ................................................. I
III. RAINFALL INFORMATION.............................................................................................I
IV. EROSION CONTROL IMPEMENTATION SCHEDULE................................................2
V. POSTDEVELOPMENT CONDITIONS.............................................................................3
APPENDIX A. PRECONSTRUCTION SITE CALCULATIONS......................................4
DRAINAGEAREA MAP...............................................................................................................5
DRAINAGE ROUTING DIAGRAM..............................................................................................6
2, 5, 10, 25, 50, 100-YEAR STORM EVENT CALCULATIONS ......................................... 7 - 30
APPENDIX B. POSTCONSTRUCTION SITE CALCULATIONS..................................31
DRAINAGEAREA MAP.............................................................................................................32
DRAINAGE ROUTING DIAGRAM............................................................................................33
2, 5, 10, 25, 50, 100-YEAR STORM EVENT CALCULATIONS ..................................... 34 - 147
APPENDIX C. NRCS SOIL REPORT.................................................................... 148 - 152
PREPARED BY
Bfoadway Civil Designs of NC,11C
218 Wesiside Sauare • fiunisYlle, ILL 35801
Phone':12561533-1287 • Fax:[phone]
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I. PREDEVELOPMENT CONDITIONS
The site is a 2.24 acre piece of property located on the southwest side of U.S. Highway 64
(Cashiers Road) and Cherrywood Drive, in Macon County North Carolina. It is a previously
developed site with a gravel driveway. The remaining portions of the lot are covered with grass
and trees. There are two streams and two wetland areas present onsite. There is an unnamed
tributary to Big Creek that runs from south to north alongside Cherrywood Drive. There is
another unnamed tributary to Big Creek that runs from west to east neara the northern property
line that forms two wetland areas before it flows into the creek adjacent to Cherrywood Drive.
Existing onsite soils are classified as Cullasaja-Tuckasegee complex, Hydrologic Soil Group A,
and Udorthents, Hydrologic Soil Group C. The site generally slopes from south to north at about
4.7%. Surface runoff flows north to the wetland area before flowing into the unnamed tributary
to Big Creek.
II. ANALYSIS METHODS
In order to determine the pre- and post -development peak discharges and hydrographs of the
drainage basins, drainage area maps were developed based upon a topographic survey performed
by King Engineering of Concord, Inc., the USGS quad map of the area for the off -site drainage
areas, and the proposed site design. From these maps, the SCS curve numbers and times of
concentration were determined and input into HydroCAD 10.0, which calculated peak flows and
hydrographs for each runoff basin by the SCS TR-20 method. Reach and pond storages and
capacities were calculated by the storage -indication routing methods.
III. RAINFALL INFORMATION
Total rainfall depths for the studied storm events were obtained from NOAA Atlas 14 Volume 9
Version 2, Precipitation -Frequency Atlas of the United States, Southeastern States, available
from the Precipitation Frequency Data Server (http://hdsc.nws.noaa.gov/hdsc/pfds). The events
and corresponding 24-hour rainfall events are summarized below.
Event
Rainfall Depth, inches
2 year
5.79
5 year
7.13
10 year
8.19
25 year
9.68
50 year
10.90
100 year
12.10

IV. EROSION CONTROL IMPLEMENTATION SCHEDULE
See the Initial, Intermediate, and Final Phase Erosion and Sedimentation Control plans accompanied this
document for locations of the practices described below.
INITIAL PHASE
1. Install construction exit pad (CEP) and type "A" silt fence (SB), double row where
indicated.
2. Clear trees as needed.
3. Strip and stockpile topsoil (TSG), and remove unsuitable material.
5. Temporary seeding to be installed on areas where grading and stabilization operations
have ceased and will not resume for 5 working days, or 7 calendar days, whichever is
shorter. If a qualifying rain event is expected, temporary stabilization shall be achieved
prior to the rain event.
INTERMEDIATE PHASE
1. Begin grading site in the building and parking areas.
2. Construction exit pad (CEP), double row of type "A" silt fence (SB), and temporary
seeding (TS) to remain and maintained as needed as grading progresses.
3. Install compost sock check dams (CS) in channels where indicated.
4. Install utilities (storm, sanitary, and water). Storm pipe outlet to be stabilized with outlet
protection (OP).
5. Protect grate inlets with block and gravel inlet protection (BIP) after installation.
6. Concrete washout (GK) to be established and maintained as necessary once concrete
pouring begins.
FINAL PHASE
1. Maintain construction exit pad (CEP), double row of type "A" silt fence (SB), check
dams (CS), and temporary seeding (TS) as site grading progresses.
2. Grade parking lot and construct building pad. Base, paving and building are to be
installed after utility construction is completed.
3. Install sod (SOD) on areas indicated as soon as practicable. Appropriate plant material
shall be installed area by area as site work permits.
4. Clean storm structures. Install any other permanent BMP.
5. Demuck all structural BMP's and safely dispose of material. Maintain silt fence until
vegetation has achieved 100% coverage across site with 85% density, then remove.

V. POSTDEVELOPMENT CONDITIONS
This project consists of constructing a 9100 sq.ft. retail store with a 28-space parking lot and
truck delivery area. The remaining areas will be landscaped with sod. Drainage from the roof
will be discharged on the surface and directed towards the curb line of the rear parking lot area.
All parking lot areas will be sloped to drain to one of five grate inlets located in the parking lot.
Those inlets will be connected to an 18" HDPE pipe network that will convey stormwater to an
underground detention chamber system located east of the building, near the driveway.
Proposed slopes of the parking lot range from 1.0% to 3.5%, while the remaining grassed areas
will be graded to a maximum slope of 4:1 H:V (25%).
A. WATER QUALITY AND QUANTITY CONTROL
In order to treat the first inch of stormwater runoff generated from this development, the
underground detention chamber system will include a separator row system which will remove
80% of the total suspended solids (TSS) from the stormwater. The separator row is wrapped in
filter fabric, and the system is designed so that stormwater entering the chambers must flow
through the separator row first, filtering 80% TSS before flowing downward and filling the
gravel bed and then the adjoining chambers.
To control the increased discharges due to this development, the on -site stormwater will be
detained in an underground detention chamber system. The chamber system will consist of 90
Cultec R-150XLHD chambers embedded in a gravel bed. The outflow will be controlled by the
use of a 6"x6" orifice and an 18"xl2" weir in the outlet control box located near the northeast
end of the parking lot. The orifices will force storm water to back up and be stored in the
chambers. Discharge from the outlet control box will be directed to the northeast, where it will
be discharged on the surface, and flow to the wetland area adjacent to the unnamed tributary to
Big Creek.
SITE DISCHARGE COMPARISON
Event
Predevelo ment, cfs
Postdevelo ment, cfs
Decrease, cfs
2 year
5.82
5.82
0.00
5 year
10.04
9.15
0.89
10 year
13.73
12.22
1.51
25 year
19.30
17.80
1.50
50 year
24.12
23.05
1.07
100 year
29.03
28.32
0.71

APPENDIX A
PRECONSTRUCTION SITE CALCULATIONS

DRAWN BY: JAC
DATE: 03-27-2019 /
NEW RETAIL STORE REVISED: 11-22-2019
CASHIERS ROAD
HIGHLANDS, NC PRECONSTRUCTION
MACON COUNTY CONDITIONS
DRAINAGE AREA MAP Broadway Civil Designs of NC,PIIC
SCALE: 1' = 100' 5 216WestsideSonora - Huntsville, At35801
Phone: [phone] - Fax: [phone]

2EX
Offsite PRE
Preconstruction Site
1 EX Discharge
Site
DRAWN BY: JAC
DATE: 03-27-2019 /
NEW RETAIL STORE REVISED: 11-22-2019
CASHIERS ROAD 00
HIGHLANDS, NC PRECONSTRUCTION
MACON COUNTY CONDITIONS
DRAINAGE ROUTING Broadway Civil Designs of NC,PIIC
g DIAGRAM 216westsideSquare •Nuntsaiile.a135801
Phone: [phone] - Fax: [phone]

PRECONSTRUCTION SITE CALCULATIONS
2-YEAR STORM EVENT

Highlands Preconstruction Type 11124-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCADO 10.00-24 s/n 05474 © 2018 HydroCAD Software Solutions LLC Page 1
Summary for Subcatchment 1 EX: Site
Runoff = 5.45 cfs @ 12.03 hrs, Volume= 15,170 cf, Depth= 1.87"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 2-yr Rainfall=5.79"
Area (sf) CN DescriDtion
42,492
76 Woods/grass comb., Fair, HSG C
6,800
98 Ex. Road
48,244
43 Woods/grass comb., Fair, HSG A
97,536
61 Weighted Average
90,736
93.03% Pervious Area
6,800
6.97% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
1.5 296 0.0470 3.25 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
5
4
3 3
0
LL
2
1
t-
-k- I --k I-4 �--I -k-
Subcatchment 1 EX: Site
Hydrograph
Ifi 1 t-Ifi1-t 1
5.45 cfs
iy�eJl`-�4 ih%
-4 1-1 4-1 IR4npff-A, r"e =W� $61*
IRM off VQlyme7151170, cf
— Runoff DeT -4 8T'
IFiow L�n�gtk12661'
1 I I Isjoj)�.6400 -1'
I I I Tc�=11.61 mil)
fiItl-t r-1 tIrt _
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
■ Runoff
8

Highlands Preconstruction Type 11124-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCADO 10.00-24 s/n 05474 © 2018 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 2EX: Offsite
Runoff = 0.60 cfs @ 12.08 hrs, Volume= 3,568 cf, Depth= 0.60"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 2-yr Rainfall=5.79"
Area (sf) CN DescriDtion
8,084
98 road
63,163
36 Woods, Fair, HSG A
71,247
43 Weighted Average
63,163
88.65% Pervious Area
8,084
11.35% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 200 0.1000 1.58 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
Subcatchment 2EX: Offsite
Hydrograph
0.6
T
0.55
T
0.5
fit
T
I�
�I
0.45
0.4
3
-22 0.3
0.25
T I
t
1
0.2
l
0.15
1-4
—1
0.1
0.05
❑ Runoff
S4 I--� F-I T I T 17T�er�Ii 241h�
- I ---j �-- I -L12�yi -kal+n'fa`-E O. 9#
-t 1-� �-Iftrhotff ArefaO71,24-71 sf
I I IN��ffIVP*I���'01 Cf
_eeIpr 0�
Flow Len �th=2 0
- IT TI T I T it eL0.11076
11 1 1 1 1 1 IT62i11niui
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
9

Highlands Preconstruction Type 111 24-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCAD® 10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 3
Summary for Link PRE: Preconstruction Site Discharge
Inflow Area = 168,783 sf, 8.82% Impervious, Inflow Depth = 1.33" for 2-yr event
Inflow = 5.82 cfs @ 12.03 hrs, Volume= 18,738 cf
Primary = 5.82 cfs @ 12.03 hrs, Volume= 18,738 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Link PRE: Preconstruction Site Discharge
Hydrograph
❑ Inflow
❑ Primary
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
10

PRECONSTRUCTION SITE CALCULATIONS
5-YEAR STORM EVENT

Highlands Preconstruction Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCADO 10.00-24 s/n 05474 © 2018 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 1 EX: Site
Runoff = 8.43 cfs @ 12.03 hrs, Volume= 22,727 cf, Depth= 2.80"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 5-yr Rainfall=7.13"
Area (sf) CN DescriDtion
42,492
76 Woods/grass comb., Fair, HSG C
6,800
98 Ex. Road
48,244
43 Woods/grass comb., Fair, HSG A
97,536
61 Weighted Average
90,736
93.03% Pervious Area
6,800
6.97% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
1.5 296 0.0470 3.25 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 1 EX: Site
Hydrograph
_ LI 11 L I
9 8.43 cfs
8
L I I I-t I L A L I I I -�_Jrki illhllfi1164.1[3�'
7 I I I I I I I I I I 11R4noff A,rga�97�5�61 s1t
6 IRM off VQIyrne7�217?71 cf
5 I�unof Dep�h.SQ"
LL 4 IFiow -L�n�ti1296'
ISio�6=6.Wd '/I'
3 1 T� 11.51irn
2-
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
■ Runoff
iv,

Highlands Preconstruction Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCADO 10.00-24 s/n 05474 © 2018 HydroCAD Software Solutions LLC Page 5
Summary for Subcatchment 2EX: Offsite
Runoff = 1.75 cfs @ 12.05 hrs, Volume= 6,716 cf, Depth= 1.13"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 5-yr Rainfall=7.13"
Area (sf) CN DescriDtion
8,084
98 road
63,163
36 Woods, Fair, HSG A
71,247
43 Weighted Average
63,163
88.65% Pervious Area
8,084
11.35% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 200 0.1000 1.58 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
Subcatchment 2EX: Offsite
Hydrograph
��I I � IIII � IIIIII
1.75 cfs I I
I I ITYpeI II+ 24-'hi
5Ly% Rain6110.1I3'I'
Rau noff Areat71,1247I sf
RuggfflVollume=,6,7161 cf
p l 13"
0 1 IIIIII �7'ovv 4�1 �7"I I,LL Length=200
�lope-- 0.1000 'i'
1 Td:�111 mirk
CND '43
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
13

Highlands Preconstruction Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCADO 10.00-24 s/n 05474 © 2018 HydroCAD Software Solutions LLC Page 6
Summary for Link PRE: Preconstruction Site Discharge
Inflow Area = 168,783 sf, 8.82% Impervious, Inflow Depth = 2.09" for 5-yr event
Inflow = 10.04 cfs @ 12.03 hrs, Volume= 29,443 cf
Primary = 10.04 cfs @ 12.03 hrs, Volume= 29,443 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Link PRE: Preconstruction Site Discharge
Hydrograph
T—I-7I 1 1 7-I -7I--1
11
T T I T T 10.04 cfs
10
9
—
8
LI L I L IL 11
7
w
6
3
2 5
LL
_
M TIT IT
4
—
f
� �
❑Inflow
❑Primary
1
LI L I
L I L
4
1 I�- 1
4-1 -� 1-4 I�
-t
h �I
tlt l
T
7 TI
T I T IT
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
14

PRECONSTRUCTION SITE CALCULATIONS
10-YEAR STORM EVENT
15

Highlands Preconstruction Type/1/ 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCADO 10.00-24 s/n 05474 © 2018 HydroCAD Software Solutions LLC Page 7
Summary for Subcatchment 1 EX: Site
Runoff = 10.96 cfs @ 12.03 hrs, Volume= 29,181 cf, Depth= 3.59"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 10-yr Rainfall=8.19"
Area (sf) CN DescriDtion
42,492
76 Woods/grass comb., Fair, HSG C
6,800
98 Ex. Road
48,244
43 Woods/grass comb., Fair, HSG A
97,536
61 Weighted Average
90,736
93.03% Pervious Area
6,800
6.97% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
1.5 296 0.0470 3.25 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
0
Subcatchment 1 EX: Site
Hydrograph
1 10.96 cfs I
11
I
I
10
9
N7
3611111111
0
LL
511111111
3
filrt I� �i
2
l
II0A,R,
■ Runoff
17 I F1
-TII 4Jh
�-1 I $gnpff�r�-4 0�7�"6�sf
�1 +"gff�V�I �n el �9��11 cl
IB noff-Depth -3.59"
F�wl i n; gt� 266
1 I -Si0�6 b.wdiv V
�-I 4 4 I- �-Tc I:I d
�I filrt I� �I �Irt �
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
`[:

Highlands Preconstruction Type/1/ 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCADO 10.00-24 s/n 05474 © 2018 HydroCAD Software Solutions LLC Page 8
Summary for Subcatchment 2EX: Offsite
Runoff = 2.90 cfs @ 12.05 hrs, Volume= 9,691 cf, Depth= 1.63"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 10-yr Rainfall=8.19"
Area (sf) CN DescriDtion
8,084
98 road
63,163
36 Woods, Fair, HSG A
71,247
43 Weighted Average
63,163
88.65% Pervious Area
8,084
11.35% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 200 0.1000 1.58 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
LO
3
0
LL
3
2
1
Subcatchment 2EX: Offsite
Hydrograph
2.90 cfs I I
I I I I ITYpeI II+ 24-1hi
I � "
'� 0 y� Rainfall 8�.19
I I I I 1 1 1 I RluiholffiAreat71,1247I sf
RUggff volurnp�%,6�1 I Cf
Runoff ulnoff Dep�h�11. 3'I
Flow Len th=2 0'
p
T�C�2 � 11 rri i r�
DN'43
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
17

Highlands Preconstruction Type 111 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCAD® 10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 9
Summary for Link PRE: Preconstruction Site Discharge
Inflow Area = 168,783 sf, 8.82% Impervious, Inflow Depth = 2.76" for 10-yr event
Inflow = 13.73 cfs @ 12.03 hrs, Volume= 38,872 cf
Primary = 13.73 cfs @ 12.03 hrs, Volume= 38,872 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Link PRE: Preconstruction Site Discharge
Hydrograph
15
14
/
13.73
cfs
12
11
+
19
L I -L I-
N
0 7
/
3
2
1=
}
- Inflow Area=168,783 sf
17
4 I
4-1 I4
I�
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Inflow
❑ Primary
18

PRECONSTRUCTION SITE CALCULATIONS
25-YEAR STORM EVENT
19

Highlands Preconstruction Type 111 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCADO 10.00-24 s/n 05474 © 2018 HydroCAD Software Solutions LLC Page 10
Summary for Subcatchment 1 EX: Site
Runoff = 14.71 cfs @ 12.02 hrs, Volume= 38,777 cf, Depth= 4.77"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 25-yr Rainfall=9.68"
Area (sf) CN DescriDtion
42,492
76 Woods/grass comb., Fair, HSG C
6,800
98 Ex. Road
48,244
43 Woods/grass comb., Fair, HSG A
97,536
61 Weighted Average
90,736
93.03% Pervious Area
6,800
6.97% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
1.5 296 0.0470 3.25 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 1 EX: Site
Hydrograph
16
15
LII
--I
L
14.71
cfs
14
13
12
11
10
w 9
o $
T
T
7'
LL '
6
5
4-14
1-4
�-- 14-1
-I
4
3111illllil
4 �—I +
�--i -L I —L
I--] L1 iy��Ikl 4 h%
r1 7 11
12--t-jr: IR-Jjh-fij llA.C&
�-1--I
�$
E-1 L' uIT9R !� del 1s��rl
TI T I T
.
I IF I -U t�261
�I t I -t
1-� tsio-�6 -b.w"v
1 I 1 1
1 1 1 1 -�
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
■ Runoff
20

Highlands Preconstruction Type 111 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCADO 10.00-24 s/n 05474 © 2018 HydroCAD Software Solutions LLC Page 11
Summary for Subcatchment 2EX: Offsite
Runoff = 4.77 cfs @ 12.04 hrs, Volume= 14,461 cf, Depth= 2.44"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 25-yr Rainfall=9.68"
Area (sf) CN DescriDtion
8,084
98 road
63,163
36 Woods, Fair, HSG A
71,247
43 Weighted Average
63,163
88.65% Pervious Area
8,084
11.35% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 200 0.1000 1.58 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
Subcatchment 2EX: Offsite
Hydrograph
IIIIIIIIIII' I III III
5 4.77 cfs
I 1 ley 1pe III �4 h%
4 -t L -t L I I I2$_yr]R�Wall=d.68-�'
R4npff 4rpa�=71 j2471 sf
-4 H 4R1un�off�VQl�rn�e7-�4�4�11 cl
w 3 Runoff Depth=2.44"
o f IIII 1 1 1 IFiow L�nJ tkl266'
2 l fi l rt l IS14-6.1Odd 11'
1 1 1 Tc7g-1 mirk
1
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
■ Runoff
21

Highlands Preconstruction Type/1/ 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 12
Summary for Link PRE: Preconstruction Site Discharge
Inflow Area = 168,783 sf, 8.82% Impervious, Inflow Depth = 3.79" for 25-yr event
Inflow = 19.30 cfs @ 12.03 hrs, Volume= 53,237 cf
Primary = 19.30 cfs @ 12.03 hrs, Volume= 53,237 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Link PRE: Preconstruction Site Discharge
Hydrograph
SIT
%I
►�I
ICI
j%
fi ��
�� � fi � �� � i
❑Inflow
❑Primary
I �VW
���6�831sf
4-14
1-4 1
I 1
4-1 +
14
I�
tIrt
I� 1
I �I
tIt
Irt
I-1
�
-E I I
C 0
E:I
I I I
I-T
Il
E:
1-14
1-4 1
I
4-1 +
14
I�
I- It
I� 1
I �I
tIt
I-
�
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
`lr:

PRECONSTRUCTION SITE CALCULATIONS
50-YEAR STORM EVENT
23

Highlands Preconstruction Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCADO 10.00-24 s/n 05474 © 2018 HydroCAD Software Solutions LLC Page 13
Summary for Subcatchment 1 EX: Site
Runoff = 17.87 cfs @ 12.02 hrs, Volume= 46,982 cf, Depth= 5.78"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 50-yr Rainfall=10.90"
Area (sf) CN DescriDtion
42,492
76 Woods/grass comb., Fair, HSG C
6,800
98 Ex. Road
48,244
43 Woods/grass comb., Fair, HSG A
97,536
61 Weighted Average
90,736
93.03% Pervious Area
6,800
6.97% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
1.5 296 0.0470 3.25 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
1E
1E
17
1E
1E
14
12
12
11
3 1C
o
LL
ii
Subcatchment 1 EX: Site
Hydrograph
I I I L I -1 I--� L— I -L I - L I - 1 1-1 1 ■Runoff
17.87 cfs -
�-1
4-1 -I
�-14-I-I
� 1 4
I-4k--
1
4-1 -I
14
I--�
H
fi
�I � I � I� L-1 ty�b 11Ir-�41h%
� I °Ifu � �
Runoff -Depth -5.78"
�I I�F�o-w)L�n�t�266'
� 14- 14 I � � I +ToO
H 4- 14 I � �-1 + 14 1
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
24

Highlands Preconstruction Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCADO 10.00-24 s/n 05474 © 2018 HydroCAD Software Solutions LLC Page 14
Summary for Subcatchment 2EX: Offsite
Runoff = 6.46 cfs @ 12.04 hrs, Volume= 18,786 cf, Depth= 3.16"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 50-yr Rainfall=10.90"
Area (sf) CN DescriDtion
8,084
98 road
63,163
36 Woods, Fair, HSG A
71,247
43 Weighted Average
63,163
88.65% Pervious Area
8,084
11.35% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 200 0.1000 1.58 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
Subcatchment 2EX: Offsite
Hydrograph
k-I �I ' '- �I � i� � I-4
' 6.46 cfs
Type III 4h-
6 1 1 1 1 1 1 1 1 1 1 1 5O�yi Rainfall=110.0&
5 -1 -F I -g4 off#r�-aFTl;2471 sf
� �Rlun+off-Y77okim�e��8 7$6 c
3 4 1 1 1 1 (Runoff Depth=3.16"
�ioW1 te; gtk-�26
LL 3 1 1 1 1 1 1 Slop6=0.100011'
2 T i i Tc7g-1 min
77
1
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
25

Highlands Preconstruction Type 111 24-hr 50-yr Rainfall= 10. 90"
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCAD® 10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 15
Summary for Link PRE: Preconstruction Site Discharge
Inflow Area = 168,783 sf, 8.82% Impervious, Inflow Depth = 4.68" for 50-yr event
Inflow = 24.12 cfs @ 12.03 hrs, Volume= 65,768 cf
Primary = 24.12 cfs @ 12.03 hrs, Volume= 65,768 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Link PRE: Preconstruction Site Discharge
Hydrograph
❑ Inflow
❑ Primary
Time (hours)
26

PRECONSTRUCTION SITE CALCULATIONS
100-YEAR STORM EVENT
27

Highlands Preconstruction Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCADO 10.00-24 s/n 05474 © 2018 HydroCAD Software Solutions LLC Page 16
Summary for Subcatchment 1 EX: Site
Runoff = 21.03 cfs @ 12.02 hrs, Volume= 55,290 cf, Depth= 6.80"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 100-yr Rainfall=12.10"
Area (sf) CN DescriDtion
42,492
76 Woods/grass comb., Fair, HSG C
6,800
98 Ex. Road
48,244
43 Woods/grass comb., Fair, HSG A
97,536
61 Weighted Average
90,736
93.03% Pervious Area
6,800
6.97% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
1.5 296 0.0470 3.25 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 1 EX: Site
Hydrograph
23
22 2;
1.03 cfsI
ICI 1114-h%
20
I 14
1�
H
-/�
4-1 -t�
H
4- 1d�y�-#aaWh:41 1&
�
18
17
l-
-1
fil
-
- -$
1415
—l—
I��
1�
-
� I
—l— — — — —
"°I��V i� 1 5 1
u 13
Runoff-Depth=6.89"
.2 10
I �
--Ifi
=
-I
— - 1-Fiew �n jt 2J6'
9
T I-T
1-7
F71
T7 I
F71
7 1-T 17 SII16�6:�b.UWV'
s
7
+- I-+
I�
1--I
J- I
H
i- I-+ 1� �-I +Tc�:II-I
6
4
� I �
1-1
CI
� I
E1
_
L I � I:] �I 112 �71
2
4
I�
1
0
0 1 2 3 4 5
6 7
8 9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
■ Runoff
28

Highlands Preconstruction Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCADO 10.00-24 s/n 05474 © 2018 HydroCAD Software Solutions LLC Page 17
Summary for Subcatchment 2EX: Offsite
Runoff = 8.23 cfs @ 12.04 hrs, Volume= 23,347 cf, Depth= 3.93"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 100-yr Rainfall=12.10"
Area (sf) CN DescriDtion
8,084
98 road
63,163
36 Woods, Fair, HSG A
71,247
43 Weighted Average
63,163
88.65% Pervious Area
8,084
11.35% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 200 0.1000 1.58 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
Subcatchment 2EX: Offsite
-k-I+ I—t H
�- I --k I-4 �-I -k-
7
5
_o
1 LI1 I-1 L
u. 4
Hydrograph
■ Runoff
8.23 cfs I +- I + I -4 h
II`�4-h%
-4 1 I I -O&y� Raintail='lill-&
IR 4npff#re-aF-T1 j2471-sf
Runoff Depth=3.93"
1
-Fiow-L�� t�26d'
I I 11 1 U SAoia6.1 Q0-9v
1 1 11 1 Tc�=�-11 r0h)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
29

Highlands Preconstruction Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 9/25/2019
HydroCADO 10.00-24 s/n 05474 © 2018 HydroCAD Software Solutions LLC Page 18
Summary for Link PRE: Preconstruction Site Discharge
Inflow Area = 168,783 sf, 8.82% Impervious, Inflow Depth = 5.59" for 100-yr event
Inflow = 29.03 cfs @ 12.03 hrs, Volume= 78,636 cf
Primary = 29.03 cfs @ 12.03 hrs, Volume= 78,636 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Link PRE: Preconstruction Site Discharge
Hydrograph
T I T I 1 7-
32
30
29.03 cfs
28
I L I A I A
26
24
I T I T I T I T1-1
22
20
1 t T I-t I-t
�16
� T1� 1-4
3 16
0
M14
L CIA IA
12
10
1 TI T I T IT
6
T I�
4
I �-
❑Inflow
❑ Primary
���b�, ��e�1���sl�s�
LIT
1A U LI LIT 1A
I� L
TIT
IT 17 TI TIT IT
IT T
TIC
ItI-fI�
II �-i �, — IA L-1 L
17 IT 17 TI T I T IT IT T
ti-t 1� H �� fi1T I-f I�
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
30

APPENDIX B
POSTCONSTRUCTION SITE CALCULATIONS
31

DRAWN BY: JAC
DATE: 03-27-2019 /
NEW RETAIL STORE REVISED: 11-22-2019
CASHIERS ROAD
HIGHLANDS, NC POSTCONSTRUCTION
MACON COUNTY CONDITIONS
DRAINAGE AREA MAP Broadway Civil Designs of NC,PIIC
SCALE: 1 ' = 10 0' 32 216 Westside Sonora • Huntsville, At 35801
Phone: [phone] - Fax: [phone]

(2EX)
Offsite
1 S North Parking/Driveway
8S
JV We land Area
Roof V I�7 \
Postcon ruction
2S Di charge
Delivery/Dumpster Area
150XLH
Cultec eten i system
(i�
7S
Front Parking Area to
G12
Front Parking Area to
G11
Septic Area
East Driveway Aisle
Cherrywood
Dr/Driveway
Cashiers Rd. R.O.W.
DRAWN BY: JAC
DATE: 03-27-2019 /
NEW RETAIL STORE REVISED: 11-22-2019
CASHIERS ROAD 00
HIGHLANDS, NC POSTCONSTRUCTION
MACON COUNTY CONDITIONS
DRAINAGE ROUTING Broadway Civil Designs of NC,PIIC
33 DIAGRAM 216westsideSquare •Nuntsaiile.a135801
Phone: [phone] - Fax: [phone]

POSTCONSTRUCTION SITE CALCULATIONS
2-YEAR STORM EVENT
34

Highlands Postconstruction w smaller Chambers Type 11124-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 1
Summary for Subcatchment 1 S: Roof
Runoff = 1.44 cfs @ 12.02 hrs, Volume= 4,327 cf, Depth= 5.55"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 2-yr Rainfall=5.79"
Area (sf) CN Description
9,352 98
9,352 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.5 70 0.0417 2.31 Sheet Flow,
Smooth surfaces n= 0.011 P2= 5.79"
0.5
U
0p
0
70 Total, Increased to minimum Tc = 1.2 min
Subcatchment 1S: Roof
Hydrograph
��ilii�lll li
1.44 cfs
Tyi�el III 24-hi
121y% I6iri 11�=09'I'
RO nbff AOeOiO9,13521 sf
RuggfflVlollumn 74,13?71cf
Rulnpff Delp�h�5�. 51I�
Flow Len h
�b�e bb
� I I I I I T�C�1 �21 r>riir�
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
35

Highlands Postconstruction w smaller Chambers Type 11124-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 2EX: Offsite
Runoff = 0.60 cfs @ 12.08 hrs, Volume= 3,568 cf, Depth= 0.60"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 2-yr Rainfall=5.79"
Area (sf) CN DescriDtion
8,084
98 road
63,163
36 Woods, Fair, HSG A
71,247
43 Weighted Average
63,163
88.65% Pervious Area
8,084
11.35% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 200 0.1000 1.58 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
Subcatchment 2EX: Offsite
Hydrograph
0.6
T
0.55
T
0.5
fit
T
I�
�I
0.45
0.4
3
-2 0.3
0.25
T I
t
1
0.2
l
0.15
1-4
—1
0.1
0.05
❑ Runoff
S4 I--� F-I T I T 17T�er�Ii 241h�
- I ---j �-- I -L12�yi -kal+n'fa`-E O. 9#
-t 1-� �-Iftrhotff ArefaO71,24-71 sf
I I IN��ffIVP*I���'01 Cf
_eeIpr 0�
Flow Len �th=2 0
- IT TI T I T it eL0.11076
11 1 1 1 1 1 IT62i11niui
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
36

Highlands Postconstruction w smaller Chambers Type 11124-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 3
Summary for Subcatchment 2S: Delivery/Dumpster Area
Runoff = 0.48 cfs @ 12.02 hrs, Volume= 1,454 cf, Depth= 5.55"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 2-yr Rainfall=5.79"
Area (sf) CN Description
3,142 98
3,142 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.8 124 0.0150 2.49 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.8 124 Total, Increased to minimum Tc = 1.2 min
Subcatchment 2S: Delivery/Dumpster Area
Hydrograph
❑ Runoff
0.5 0.48 cfs
T�ielfli 24=h�
0.45
2-�%�au�fa`-I-I 5171�
0 4 L I-L I� U -i L-1 L I ft nbfff-Arle�li 13,11421 sf
0.351-4
�Ryqqff�vP"44
0 025 t-I + ��u Q _qe 5�
- FI w L n �h=124
LL 0.2 fi l fi l t 1- �1 -r l t eL0.d1
0.15 F-I - T 17 FT-6=�—j 12Trr i6
0.1 Q114-VO
0.05
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
37

Highlands Postconstruction w smaller Chambers Type 11124-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 3S: North Parking/Driveway
Runoff = 0.88 cfs @ 12.02 hrs, Volume= 2,640 cf, Depth= 5.55"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 2-yr Rainfall=5.79"
Area (sf) CN Description
5,705 98
5,705 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.7 127 0.0200 2.87 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.7 127 Total, Increased to minimum Tc = 1.2 min
Subcatchment 3S: North Parking/Driveway
Hydrograph
-1
I
1-4
1-4
0.95
0.9
0.85
0.88
cfs
rye
�Te�fl-h
0.8
4-1
�-
14
1 W
4
�
W12�yi•
a faFtf� 719'
0.75
0.7
� I
+
14
1 �-
-
4
P
ftnbfff-Aisle 1=5,70-51 Sf
0.65
0.6
� I
+
14
1 H
4
FRY irffY071P rp-P �27,W10
w 0.55
0045
I+14
H
4
I�
11
Q Ip r"'54
-
a
0.4
0.35
�1+14
1�1
H4-I4
v� L =a 2�
O �n
L d
0.3
-H
+
1 �
H
H
H
+ I 16il 12ffiil rii
0.25
0.2
+
0.15
0.1
4
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
38

Highlands Postconstruction w smaller Chambers Type 11124-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 5
Summary for Subcatchment 4S: East Driveway Aisle
Runoff = 0.47 cfs @ 12.02 hrs, Volume= 1,424 cf, Depth= 5.55"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 2-yr Rainfall=5.79"
Area (sf) CN Description
3,077 98
3,077 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.9 108 0.0090 1.93 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.9 108 Total, Increased to minimum Tc = 1.2 min
Subcatchment 4S: East Driveway Aisle
Hydrograph
0.5 L I L L o.47 cfs l -1 L I L L 1 LT e�11 241 h%
0.45
' I I I I I � I� �I � 12�yi•�ta�falH�5�719'k
0.4
0.35 4 4 H RLinbfff-AOe�1=la,I0T71 S#
0.3 L I + 1 � 1�1� ��p� u rpe �1��41 ".57
cf
c 0.25 L I t 1—t Lu r��
.2 Flow Len th=1 8
0.2 eLa .;0
0.15 1 1 1T6=614nii6
0.05
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
39

Highlands Postconstruction w smaller Chambers Type 11124-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 5S: Front Parking Area to G12
Runoff = 0.56 cfs @ 12.02 hrs, Volume= 1,673 cf, Depth= 5.55"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 2-yr Rainfall=5.79"
Area (sf) CN Description
3,615 98
3,615 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.4 70 0.0170 2.65 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.4 70 Total, Increased to minimum Tc = 1.2 min
Subcatchment 5S: Front Parking Area to G12
Hydrograph
0.6
� �
�
� � � � � �
❑Runoff
0.55
fit
l
0.56 cfs
fi �
T e II 241h
0.5
I_ I
I I
121 i Italirif�11:6090
0.45
Li
me d
- I
L I
RO n-Off-A"e -' L,16151
0.4
- 1
+ 14
I y"ff+Vo1urp-� +t16T31 cf
Zia
0 00 3
F 1
T 17
Coll
�Ip� 5f`
To-�
-
LL
0.25
T� V n� h=
0 2
I- I�
0.15
fi
fi
I
t t I NF=9
0.1
0.05
I
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
40

Highlands Postconstruction w smaller Chambers Type 11124-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 7
Summary for Subcatchment 6S: Front Parking Area to Gil
Runoff = 0.78 cfs @ 12.03 hrs, Volume= 2,197 cf, Depth= 4.64"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 2-yr Rainfall=5.79"
Area (sf) CN DescriDtion
1,138
60 Avg. of Woods/grass & Newly graded, HSG A
4,543
98
5,681
90 Weighted Average
1,138
20.03% Pervious Area
4,543
79.97% Impervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
1.7
21
0.2500
0.21
Sheet Flow,
Grass: Bermuda n= 0.410 P2= 5.79"
0.5
51
0.0080
1.82
Shallow Concentrated Flow,
Paved Kv= 20.3 fps
2.2
72
Total
Subcatchment 6S: Front Parking Area to Gil
Hydrograph
T I—
T- 0.78 cfs --4
0.75
0.7
I L I I I -i
0.65
0.6
ITITI�II
0.55
1-I t Irt 1 t-I
0.5
- 0.45
0
+
0.4
_
LL 0.35
I�I�I�II
0.3
0.25
L I I I -L
0.2
0.15
- - -0.1
�I 1-4T�e�i �4!h%
L I L 12�y%-F60N 0. 9J
F-1 ft nTOFArie T , I68-11 s-f
Pq"Tv1°tprp— O FI O
u Q �,pT74.-14vv
-IowLeng th=7T
L-I L I I -i U Lth= 9d
F-1 7IT17 F F1T1-1
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
Ell

Highlands Postconstruction w smaller Chambers Type 11124-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 8
Summary for Subcatchment 7S: Septic Area
Runoff = 0.25 cfs @ 12.05 hrs, Volume= 1,150 cf, Depth= 0.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 2-yr Rainfall=5.79"
Area (sf) CN DescriDtion
2,401 60 Avg. of Woods/Grass & Newly graded, HSG A
16,794 43 Woods/grass comb., Fair, HSG A
19,195 45 Weighted Average
19,195 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.9 230 0.0730 4.05 Shallow Concentrated Flow,
Grassed Waterwav Kv= 15.0 fos
0.9 230 Total, Increased to minimum Tc = 1.2 min
0.26
0.24
0.22
02
I �14-1- I
0.18
0.16
a
TIT 17
3 0.14
L I I —L I —I
LL 0.12
0.1
n ns
Subcatchment 7S: Septic Area
Hydrograph
.-L- I--L I I I I -i- I I I I L---I L--
0.211
I__j �I 1_jTe 12+41h
IRtt hoff 'AreIzO1 ,I1951 sf
T I� I�N��PIu� ����I Cf
I� L_IuQIn r7I2"
o e� 3�
Is6=iI 121 rr ii
-T T'
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
42

Highlands Postconstruction w smaller Chambers Type 11124-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 9
Summary for Subcatchment 8S: NW Wetland Area
Runoff = 0.87 cfs @ 12.05 hrs, Volume= 2,560 cf, Depth= 1.87"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 2-yr Rainfall=5.79"
Area (sf) CN DescriDtion
331 60 Avg. of Woods/Grass & Newly Graded, HSG A
2,664 83 Avg. of Woods/Grass & Newly Graded, HSG C
8,086 43 Woods/grass comb., Fair, HSG A
5,379 76 Woods/grass comb., Fair, HSG C
16,460 61 Weighted Average
16,460 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
3.0 226 0.0070 1.25 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 8S: NW Wetland Area
Hydrograph
0.95
-4
—
1-4 —
❑Runoff
0 9
0.85
----
8 0
.7
cfs
1 4
H I
H 4 1 JT�e-fl i it h-�
0-8
k I
H
14
H
H
H
H
H 12 y%-kaki f":65j"
0.75
0`7
1
H
1
1
—
H
HR-tOoff IAre00--*,1401 sf
0.65
0.6
H I
H
14
1 H I
H
IH
PW�PTVP�UT��Z,5-1740I Cf
w 0.55
0
H 1
H
1 H
1 H I
-
I H
H I
_
Q Ip T H 4
00.5
LL
0.4
0.35
H
H
Hi
H
H
ova Lin =2W
HL Od
0.3
I
H
H
t6:63iOir ri#
0.25
0.2
-
H
H
H I H I H H
0.15
—
0.1
i
I H -
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
43

Highlands Postconstruction w smaller Chambers Type 11124-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 10
Summary for Subcatchment 9S: Cherrywood Dr/Driveway
Runoff = 2.15 cfs @ 12.03 hrs, Volume= 5,806 cf, Depth= 3.79"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 2-yr Rainfall=5.79"
Area (sf) CN DescriDtion
2,293
60
Avg. of Woods/Grass & Newly Graded, HSG A
4,911
83
Avg. of Woods/Grass & Newly Graded, HSG C
4,885
98
6,273
76
Woods/grass comb., Fair, HSG C
18,362
82
Weighted Average
13,477
73.40% Pervious Area
4,885
26.60% Impervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
2.0 256 0.0200 2.12 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 9S: Cherrywood Dr/Driveway
Hydrograph
■ Runoff
2.15 cfs
Tyl �
2 1 1 1 121y% Rai rllfall�=09'1'
Rluihdffl Area#118,13621 sf
Ruggffl Vlollume�5,8Q61 cf
Runpfl Pe,pth-=3.7I9'1,
.2 -Flow Length=256
1 1 1 1 1 1 1 1 �1b�eL0.026d'i'
T6:46niirIll
1 1 CND=182
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
44

Highlands Postconstruction w smaller Chambers Type 11124-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 11
Summary for Subcatchment 10S: Cashiers Rd. R.O.W.
Runoff = 1.01 cfs @ 12.03 hrs, Volume= 2,751 cf, Depth= 2.55"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 2-yr Rainfall=5.79"
Area (sf) CN DescriDtion
5,907 60 Avg. of Woods/Grass & Newly Graded, HSG A
4,208 98
2,833 43 Woods/grass comb., Fair, HSG A
12,948 69 Weighted Average
8,740 67.50% Pervious Area
4,208 32.50% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 383 0.0430 3.11 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 10S: Cashiers Rd. R.O.W.
Hydrograph
i III��
1.01 cfsl I � � � �
1 Thy e II+�24-hir
121y% lkt iinfa ll�=09'I'
Rluihdffl AlrOa�--112,19481 sf
Ruggffl Vlollugnp=2,7�1 i cf
3 Rulnpfl Pe,p�h=2 ' 55Flow Len th=83'
�1b�eL�.a�4�d
T641 ni i 6
CN=169
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
45

Highlands Postconstruction w smaller Chambers Type 111 24-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD® 10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 12
Summary for Pond 150XLHD: Cultec detention system
Inflow Area =
30,572 sf,
96.28% Impervious,
Inflow Depth = 5.38" for 2-yr event
Inflow =
4.59 cfs @
12.02 hrs, Volume=
13,714 cf
Outflow =
1.30 cfs @
12.29 hrs, Volume=
13,713 cf, Atten= 72%, Lag= 16.3 min
Primary =
1.30 cfs @
12.29 hrs, Volume=
13,713 cf
Routing by Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Peak Elev= 4,022.67' @ 12.29 hrs Surf.Area= 3,680 sf Storage= 3,194 cf
Plug -Flow detention time= 33.5 min calculated for 13,713 cf (100% of inflow)
Center -of -Mass det. time= 33.4 min ( 781.2 - 747.8 )
Volume
Invert
Avail.Storage
Storage Description
#1A
4,021.25'
687 cf
40.50'W x 23.25'L x 2.54'H Field A
2,393 cf Overall - 675 cf Embedded = 1,718 cf x 40.0% Voids
#2A
4,021.75'
675 cf
Cultec R-150XLHD x 24 Inside #1
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 12 rows
#313
4,021.25'
1,476 cf
24.25'W x 84.75'L x 2.54'H Field B
5,224 cf Overall - 1,534 cf Embedded = 3,689 cf x 40.0% Voids
#413
4,021.75'
1,534 cf
Cultec R-150XLHD x 56 Inside #3
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 7 rows
#5C
4,021.25'
307 cf
17.75'W x 23.25'L x 2.54'H Field C
1,049 cf Overall - 281 cf Embedded = 767 cf x 40.0% Voids
#6C
4,021.75'
281 cf
Cultec R-150XLHD x 10 Inside #5
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 5 rows
#7
4,021.65'
8 cf
12.0" Round 10 LF 12" HDPE
L= 10.0' S= 0.0083 T
#8
4,021.80'
56 cf
4.00'D x 4.49'H J131
#9
4,021.90'
76 cf
18.0" Round 43 LF 18" HDPE
L= 43.0' S= 0.0100 T
#10
4,022.37'
48 cf
4.00'D x 3.83'H G11
#11
4,022.47'
138 cf
18.0" Round 78 LF 18" HDPE
L= 78.0' S= 0.0100 '/'
#12
4,023.29'
36 cf
4.00'D x 2.83'H G11
#13
4,021.80'
44 cf
4.00'D x 3.49'H G14
#14
4,021.90'
102 cf
18.0" Round 58 LF 18" HDPE
L= 58.0' S= 0.0100 T
#15
4,022.51'
40 cf
4.00'D x 3.18'H G13
#16
4,021.94'
40 cf
4.00'D x 3.20'H J132
#17
4,022.04'
40 cf
15.0" Round 33 LF 15" HDPE
L= 33.0' S= 0.0100 T
#18
4,022.41'
37 cf
4.00'D x 2.96'H G15
5,627 cf
Total Available Storage
Storage Group A created with Chamber Wizard
46

Highlands Postconstruction w smaller Chambers Type 111 24-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD® 10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 13
Storage Group B created with Chamber Wizard
Storage Group C created with Chamber Wizard
Device
Routing
Invert
Outlet Devices
#1
Primary
4,021.15'
18.0" Round Culvert L= 4.0' Ke= 0.500
Inlet / Outlet Invert= 4,021.15' / 4,021.10' S= 0.0125 '/' Cc= 0.900
n= 0.012, Flow Area= 1.77 sf
#2
Device 1
4,021.25'
6.0" W x 6.0" H Vert. Orifice C= 0.600
#3
Device 1
4,022.75'
1.5' long Weir 2 End Contraction(s) 1.0' Crest Height
#4
Device 1
4,023.75'
5.0' long Top of Wall 2 End Contraction(s)
Primary OutFlow Max=1.30 cfs @ 12.29 hrs HW=4,022.67' (Free Discharge)
L =Culvert (Passes 1.30 cfs of 6.08 cfs potential flow)
2=Orifice (Orifice Controls 1.30 cfs @ 5.19 fps)
3=Weir ( Controls 0.00 cfs)
4=Top of Wall ( Controls 0.00 cfs)
47

Highlands Postconstruction w smaller Chambers Type 11124-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
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Pond 150XLHD: Cultec detention system - Chamber Wizard Field A
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 12 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
2 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 21.25' Row Length +12.0" End Stone x 2 =
23.25' Base Length
12 Rows x 33.0" Wide + 6.0" Spacing x 11 + 12.0" Side Stone x 2 = 40.50' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
24 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 12 Rows = 675.5 cf Chamber Storage
2,393.3 cf Field - 675.5 cf Chambers = 1,717.8 cf Stone x 40.0% Voids = 687.1 cf Stone Storage
Chamber Storage + Stone Storage = 1,362.6 cf = 0.031 of
Overall Storage Efficiency = 56.9%
Overall System Size = 23.25' x 40.50' x 2.54'
24 Chambers
88.6 cy Field
63.6 cy Stone
48

Highlands Postconstruction w smaller Chambers Type 11124-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 15
Pond 150XLHD: Cultec detention system - Chamber Wizard Field B
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 7 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
8 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 82.75' Row Length +12.0" End Stone x 2 =
84.75' Base Length
7 Rows x 33.0" Wide + 6.0" Spacing x 6 + 12.0" Side Stone x 2 = 24.25' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
56 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 7 Rows = 1,534.4 cf Chamber Storage
5,223.6 cf Field - 1,534.4 cf Chambers = 3,689.2 cf Stone x 40.0% Voids = 1,475.7 cf Stone Storage
Chamber Storage + Stone Storage = 3,010.1 cf = 0.069 of
Overall Storage Efficiency = 57.6%
Overall System Size = 84.75' x 24.25' x 2.54'
56 Chambers
193.5 cy Field
136.6 cy Stone
49

Highlands Postconstruction w smaller Chambers Type 11124-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
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Pond 150XLHD: Cultec detention system - Chamber Wizard Field C
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 5 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
2 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 21.25' Row Length +12.0" End Stone x 2 =
23.25' Base Length
5 Rows x 33.0" Wide + 6.0" Spacing x 4 + 12.0" Side Stone x 2 = 17.75' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
10 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 5 Rows = 281.5 cf Chamber Storage
1,048.9 cf Field - 281.5 cf Chambers = 767.5 cf Stone x 40.0% Voids = 307.0 cf Stone Storage
Chamber Storage + Stone Storage = 588.4 cf = 0.014 of
Overall Storage Efficiency = 56.1 %
Overall System Size = 23.25' x 17.75' x 2.54'
10 Chambers
38.8 cy Field
28.4 cy Stone
50

Highlands Postconstruction w smaller Chambers Type 11124-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD® 10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 17
Pond 150XLHD: Cultec detention system
Hydrograph
HI IH IH H fi I H I H H H t— IH
I I I I I I I I 14.59 cfs
IHHITI
4
IIIIIIIIIII
a
3
3
0
1
0
0 1 2 3 4 5 6 7
1.30 cfs
I Wi6W1 IAii6a=30,�71Ist
I I Sfoir g6=6J,1194 6t
I IIHIIIIIIIHI
IIHIIIIIIIHI
IIIIIIIIIIII
H L-I L I L I I I H I-
I I I H I I 1 1 1 1 1 1 1 1
10 11 12 13 14 15 16 17 18
Time (hours)
23 24 25 26 27 28 29 30
S Inflow
❑ Primary
51

Highlands Postconstruction w smaller Chambers Type 111 24-hr 2-yr Rainfall=5.79"
Prepared by Broadway Management, LLC Printed 11/22/2019
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Summary for Link POST: Postconstruction Site Discharge
Inflow Area = 168,784 sf, 27.62% Impervious, Inflow Depth = 2.10" for 2-yr event
Inflow = 5.82 cfs @ 12.04 hrs, Volume= 29,549 cf
Primary = 5.82 cfs @ 12.04 hrs, Volume= 29,549 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Link POST: Postconstruction Site Discharge
Hydrograph
❑ Inflow
❑ Primary
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
52

POSTCONSTRUCTION SITE CALCULATIONS
5-YEAR STORM EVENT
53

Highlands Postconstruction w smaller Chambers Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 19
Summary for Subcatchment 1 S: Roof
Runoff = 1.78 cfs @ 12.02 hrs, Volume= 5,370 cf, Depth= 6.89"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 5-yr Rainfall=7.13"
Area (sf) CN Description
9,352 98
9,352 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.5 70 0.0417 2.31 Sheet Flow,
Smooth surfaces n= 0.011 P2= 5.79"
0.5
3 1
0
LL
0p
0
70 Total, Increased to minimum Tc = 1.2 min
Subcatchment 1S: Roof
Hydrograph
��ilii�lll li
1.78 cfs
Tyi�e1Ili 24-hi
51y% Iaiirifai11�7�.113'I'
RO nbff Arte0109,13521 sf
Ruggffl VIollugn�75,13701 cf
.
IIII 1 �mr 4E1h�'
�
Flow Len h . '
� I I I I I T�C�1 �21 r>riir�
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
54

Highlands Postconstruction w smaller Chambers Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 20
Summary for Subcatchment 2EX: Offsite
Runoff = 1.75 cfs @ 12.05 hrs, Volume= 6,716 cf, Depth= 1.13"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 5-yr Rainfall=7.13"
Area (sf) CN DescriDtion
8,084
98 road
63,163
36 Woods, Fair, HSG A
71,247
43 Weighted Average
63,163
88.65% Pervious Area
8,084
11.35% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 200 0.1000 1.58 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
Subcatchment 2EX: Offsite
Hydrograph
��I I � IIII � IIIIII
1.75 cfs I I
I I ITYpeI II+ 24-'hi
5Ly% Rain6110.1I3'I'
Rau noff Areat71,1247I sf
RuggfflVollume=,6,7161 cf
p l 13"
0 1 IIIIII �7'ovv 4�1 �7"I I,LL Length=200
�lope-- 0.1000 'i'
1 Td:�111 mirk
CND '43
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
55

Highlands Postconstruction w smaller Chambers Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 21
Summary for Subcatchment 2S: Delivery/Dumpster Area
Runoff = 0.60 cfs @ 12.02 hrs, Volume= 1,804 cf, Depth= 6.89"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 5-yr Rainfall=7.13"
Area (sf) CN DescriDtion
3,142 98
3,142 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.8 124 0.0150 2.49 Shallow Concentrated Flow,
Paved Kv= 20.3 fDs
0.8 124 Total, Increased to minimum Tc = 1.2 min
Subcatchment 2S: Delivery/Dumpster Area
Hydrograph
0.65 + 14 I + ❑Runoff
0.60 cfs
0.6 TITIT IT � TI TITIT
— T eA 24-h�
0.55 L I+� L I 5 yi•�ta fa�N� 1
0.5
0.45 + + + H + ftnbfff AOe�i=la,114-2I sf
0.4 �f rmq lVp Mr"=I �j1� 4ICf
3 0.35 T + u Q ep�17 �
° 0.3 FI w L n �h=14
LL 0.25 T l rt l rt lI �I fi l rt eL0.d1d
0.2 II I16=� 12lri{hi
0.15 T I T 1-4 4 I H�--QN=00
0.1
0.05 17
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
56

Highlands Postconstruction w smaller Chambers Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 22
Summary for Subcatchment 3S: North Parking/Driveway
Runoff = 1.09 cfs @ 12.02 hrs, Volume= 3,276 cf, Depth= 6.89"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 5-yr Rainfall=7.13"
Area (sf) CN Description
5,705 98
5,705 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.7 127 0.0200 2.87 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.7 127 Total, Increased to minimum Tc = 1.2 min
Subcatchment 3S: North Parking/Driveway
Hydrograph
1.09 cfs
51y% 06infa 11�=�.1131I'
ROnbff Me0105,17051 sf
Ruggffl Vlolpkne73,12761 cf
eL.b2bb9'Runpff Delp�h�6.
�
LL Fowen=11'
� I I I I I T�C�1 �21 r>riir�
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
57

Highlands Postconstruction w smaller Chambers Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 23
Summary for Subcatchment 4S: East Driveway Aisle
Runoff = 0.59 cfs @ 12.02 hrs, Volume= 1,767 cf, Depth= 6.89"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 5-yr Rainfall=7.13"
Area (sf) CN Description
3,077 98
3,077 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.9 108 0.0090 1.93 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
w
0
LL
0.9 108 Total, Increased to minimum Tc = 1.2 min
Subcatchment 4S: East Driveway Aisle
Hydrograph
TTIT 1 1 1 1 T1T 1 1
0.59 cfs
�1 ITI T IA
TIT IT IT T T
�— I T 14 I AtA T I�
0.25 T I T 17
0.2
0.15
0.1
T11
I T T
IT�elIi 14 h�
�I � 15�yi•�a�faFtf��11�
T I RO nTDfff ArFe-;� 1a OT71 s-f
IRqgq�VP�Mr"p=11 1�f71
__1 _, up Q ep�h7 97
ow Len th=1 8
TI TI T L Od
L-I T I T I-i I-T6==j J2rriuj
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
58

Highlands Postconstruction w smaller Chambers Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 24
Summary for Subcatchment 5S: Front Parking Area to G12
Runoff = 0.69 cfs @ 12.02 hrs, Volume= 2,076 cf, Depth= 6.89"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 5-yr Rainfall=7.13"
Area (sf) CN Description
3,615 98
3,615 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.4 70 0.0170 2.65 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.4 70 Total, Increased to minimum Tc = 1.2 min
Subcatchment 5S: Front Parking Area to G12
Hydrograph
1— +I -+
I --I
�—I
L I +
0.75
0.7
Li
L
I LI
_ 0.69 cfs
L I
L I L I L Tied I-
0.65
I L I
t
1 rt l
I—
I�
f-1
L 15ti•-ka �f 11�7fi.113�
0.s
0.55
1
4-
1
�- 1l,
3, Io6y1551 Sf
R nbff(f�
�I""I��II---n,I-
�A08
45
4-1
+
I
—
u�Y �~T �j�
r�
0.35
U.
0.3
I
I Ti
I
I I I
-
I �_
I I
I I
� 1 /
�nr erigt �
I I I �pieL(�-01�0
0.25
L 1
t
11
�-1
L -t I -i 1file jztf�-A
0.2
0.15
L 1
L
L
1 L 1
IL
LI
L I L I L LI LCN7-9-8
0.1
n nr
_
+
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
59

Highlands Postconstruction w smaller Chambers Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 25
Summary for Subcatchment 6S: Front Parking Area to Gil
Runoff = 0.98 cfs @ 12.03 hrs, Volume= 2,817 cf, Depth= 5.95"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 5-yr Rainfall=7.13"
Area (sf) CN DescriDtion
1,138
60 Avg. of Woods/grass & Newly graded, HSG A
4,543
98
5,681
90 Weighted Average
1,138
20.03% Pervious Area
4,543
79.97% Impervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
1.7
21
0.2500
0.21
Sheet Flow,
Grass: Bermuda n= 0.410 P2= 5.79"
0.5
51
0.0080
1.82
Shallow Concentrated Flow,
Paved Kv= 20.3 fps
2.2
72
Total
3
0
LL
Subcatchment 6S: Front Parking Area to Gil
Hydrograph
0.98 cfs
Type1Ili 24-h%
151y% Rainfa ll�=�.113'I'
ROnbff AlllteA05,1661 I sf
Ruggffl Volluln��2,18171 cf
RulnOff Qeip�h7�.95"
Flow Length=72'
Tc1 1.2� nA6
,N=06
Illlllli
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
60

Highlands Postconstruction w smaller Chambers Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 26
Summary for Subcatchment 7S: Septic Area
Runoff = 0.61 cfs @ 12.03 hrs, Volume= 2,077 cf, Depth= 1.30"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 5-yr Rainfall=7.13"
Area (sf) CN DescriDtion
2,401 60 Avg. of Woods/Grass & Newly graded, HSG A
16,794 43 Woods/grass comb., Fair, HSG A
19,195 45 Weighted Average
19,195 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.9 230 0.0730 4.05 Shallow Concentrated Flow,
Grassed Waterwav Kv= 15.0 fos
0.9 230 Total, Increased to minimum Tc = 1.2 min
Subcatchment 7S: Septic Area
Hydrograph
0.65 0.61 cfs
0.6 I t I t 1� l I I-1 �I t t 1 --T�e IIi 2-4!h4
0.55 I I II 1 �1y�al; fu�11
05 I4 4 1--� HRU hoof IAre01--010,119-51 sf
0.45
0.4 T T 7 INN1°`fFa5 p71 Cf
0 0.35 Li I 1� - I-1 LI u Q Ip r__L
.2 0.3 Flow Len th=2 0
0.25 fi l fi l l I� �1 t l t -eLa .d7-id
_ P
0.15 14 + I 1— N=
0.1
0.05
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
61

Highlands Postconstruction w smaller Chambers Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 27
Summary for Subcatchment 8S: NW Wetland Area
Runoff = 1.35 cfs @ 12.05 hrs, Volume= 3,835 cf, Depth= 2.80"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 5-yr Rainfall=7.13"
Area (sf) CN DescriDtion
331 60 Avg. of Woods/Grass & Newly Graded, HSG A
2,664 83 Avg. of Woods/Grass & Newly Graded, HSG C
8,086 43 Woods/grass comb., Fair, HSG A
5,379 76 Woods/grass comb., Fair, HSG C
16,460 61 Weighted Average
16,460 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
3.0 226 0.0070 1.25 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 8S: NW Wetland Area
Hydrograph
1.35 cfs l��I
I I I I ITYpeI II+ 24!hir
51y% l�aiirifaill�7�.113'I'
1 1 -4 1110 66ff l-Arda�- % 7460 IV
1 Ruggffl Vollugnp=3,8�5 cf
RuInpfl Pe,p�h=2 ' 80U-Flow Len th=26'
I III I I I I I I I �1b�eL�.a�o�d'�'
1 1T6C 314n{16
CN=161
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
62

Highlands Postconstruction w smaller Chambers Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 28
Summary for Subcatchment 9S: Cherrywood Dr/Driveway
Runoff = 2.83 cfs @ 12.03 hrs, Volume= 7,709 cf, Depth= 5.04"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 5-yr Rainfall=7.13"
Area (sf) CN DescriDtion
2,293
60
Avg. of Woods/Grass & Newly Graded, HSG A
4,911
83
Avg. of Woods/Grass & Newly Graded, HSG C
4,885
98
6,273
76
Woods/grass comb., Fair, HSG C
18,362
82
Weighted Average
13,477
73.40% Pervious Area
4,885
26.60% Impervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
2.0 256 0.0200 2.12 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 9S: Cherrywood Dr/Driveway
Hydrograph
1- 1 -Li�I�
3 F 2.83 cfs
Type ' I 1124-h r
151yll- RairlfaI14.113'I'
Rluihdffl Alrea$118,13621 sf
2 RuggfflVlolluTn 77,17Q91cf
Rulnoff Depth=5. 4'1,
LL Flow Length=2 6
o
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
63

Highlands Postconstruction w smaller Chambers Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 29
Summary for Subcatchment 10S: Cashiers Rd. R.O.W.
Runoff = 1.45 cfs @ 12.03 hrs, Volume= 3,907 cf, Depth= 3.62"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 5-yr Rainfall=7.13"
Area (sf) CN DescriDtion
5,907 60 Avg. of Woods/Grass & Newly Graded, HSG A
4,208 98
2,833 43 Woods/grass comb., Fair, HSG A
12,948 69 Weighted Average
8,740 67.50% Pervious Area
4,208 32.50% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 383 0.0430 3.11 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 10S: Cashiers Rd. R.O.W.
Hydrograph
1.45 cfs l��I
I I I I ITYpeI II+ 24!hir
151y % l�aiirifaill=7�.1I3'I'
Rluihdffl AlrOa�--112,1948I sf
RuggfflNlolluTp=3,9Q7i cf
RuInpfl Pep�h=3.16.2"
LL Flow Len th=383'
III III I I I I I I I �lb�eL�.a�4�d '�'
T6=21.1 n{ i 6
CN=I69
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
64

Highlands Postconstruction w smaller Chambers Type 111 24-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD® 10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 30
Summary for Pond 150XLHD: Cultec detention system
Inflow Area =
30,572 sf,
96.28% Impervious,
Inflow Depth = 6.72" for 5-yr event
Inflow =
5.69 cfs @
12.02 hrs, Volume=
17,110 cf
Outflow =
1.90 cfs @
12.23 hrs, Volume=
17,110 cf, Atten= 67%, Lag= 12.4 min
Primary =
1.90 cfs @
12.23 hrs, Volume=
17,110 cf
Routing by Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Peak Elev= 4,022.95' @ 12.23 hrs Surf.Area= 3,722 sf Storage= 3,914 cf
Plug -Flow detention time= 32.9 min calculated for 17,110 cf (100% of inflow)
Center -of -Mass det. time= 32.9 min ( 777.3 - 744.4 )
Volume
Invert
Avail.Storage
Storage Description
#1A
4,021.25'
687 cf
40.50'W x 23.25'L x 2.54'H Field A
2,393 cf Overall - 675 cf Embedded = 1,718 cf x 40.0% Voids
#2A
4,021.75'
675 cf
Cultec R-150XLHD x 24 Inside #1
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 12 rows
#313
4,021.25'
1,476 cf
24.25'W x 84.75'L x 2.54'H Field B
5,224 cf Overall - 1,534 cf Embedded = 3,689 cf x 40.0% Voids
#413
4,021.75'
1,534 cf
Cultec R-150XLHD x 56 Inside #3
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 7 rows
#5C
4,021.25'
307 cf
17.75'W x 23.25'L x 2.54'H Field C
1,049 cf Overall - 281 cf Embedded = 767 cf x 40.0% Voids
#6C
4,021.75'
281 cf
Cultec R-150XLHD x 10 Inside #5
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 5 rows
#7
4,021.65'
8 cf
12.0" Round 10 LF 12" HDPE
L= 10.0' S= 0.0083 T
#8
4,021.80'
56 cf
4.00'D x 4.49'H J131
#9
4,021.90'
76 cf
18.0" Round 43 LF 18" HDPE
L= 43.0' S= 0.0100 T
#10
4,022.37'
48 cf
4.00'D x 3.83'H G11
#11
4,022.47'
138 cf
18.0" Round 78 LF 18" HDPE
L= 78.0' S= 0.0100 '/'
#12
4,023.29'
36 cf
4.00'D x 2.83'H G11
#13
4,021.80'
44 cf
4.00'D x 3.49'H G14
#14
4,021.90'
102 cf
18.0" Round 58 LF 18" HDPE
L= 58.0' S= 0.0100 T
#15
4,022.51'
40 cf
4.00'D x 3.18'H G13
#16
4,021.94'
40 cf
4.00'D x 3.20'H J132
#17
4,022.04'
40 cf
15.0" Round 33 LF 15" HDPE
L= 33.0' S= 0.0100 T
#18
4,022.41'
37 cf
4.00'D x 2.96'H G15
5,627 cf
Total Available Storage
Storage Group A created with Chamber Wizard
65

Highlands Postconstruction w smaller Chambers Type 111 24-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD® 10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 31
Storage Group B created with Chamber Wizard
Storage Group C created with Chamber Wizard
Device
Routing
Invert
Outlet Devices
#1
Primary
4,021.15'
18.0" Round Culvert L= 4.0' Ke= 0.500
Inlet / Outlet Invert= 4,021.15' / 4,021.10' S= 0.0125 '/' Cc= 0.900
n= 0.012, Flow Area= 1.77 sf
#2
Device 1
4,021.25'
6.0" W x 6.0" H Vert. Orifice C= 0.600
#3
Device 1
4,022.75'
1.5' long Weir 2 End Contraction(s) 1.0' Crest Height
#4
Device 1
4,023.75'
5.0' long Top of Wall 2 End Contraction(s)
Primary OutFlow Max=1.89 cfs @ 12.23 hrs HW=4,022.95' (Free Discharge)
L =Culvert (Passes 1.89 cfs of 7.65 cfs potential flow)
2=Orifice (Orifice Controls 1.45 cfs @ 5.80 fps)
3=Weir (Weir Controls 0.44 cfs @ 1.51 fps)
4=Top of Wall ( Controls 0.00 cfs)
66

Highlands Postconstruction w smaller Chambers Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 32
Pond 150XLHD: Cultec detention system - Chamber Wizard Field A
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 12 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
2 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 21.25' Row Length +12.0" End Stone x 2 =
23.25' Base Length
12 Rows x 33.0" Wide + 6.0" Spacing x 11 + 12.0" Side Stone x 2 = 40.50' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
24 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 12 Rows = 675.5 cf Chamber Storage
2,393.3 cf Field - 675.5 cf Chambers = 1,717.8 cf Stone x 40.0% Voids = 687.1 cf Stone Storage
Chamber Storage + Stone Storage = 1,362.6 cf = 0.031 of
Overall Storage Efficiency = 56.9%
Overall System Size = 23.25' x 40.50' x 2.54'
24 Chambers
88.6 cy Field
63.6 cy Stone
67

Highlands Postconstruction w smaller Chambers Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 33
Pond 150XLHD: Cultec detention system - Chamber Wizard Field B
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 7 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
8 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 82.75' Row Length +12.0" End Stone x 2 =
84.75' Base Length
7 Rows x 33.0" Wide + 6.0" Spacing x 6 + 12.0" Side Stone x 2 = 24.25' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
56 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 7 Rows = 1,534.4 cf Chamber Storage
5,223.6 cf Field - 1,534.4 cf Chambers = 3,689.2 cf Stone x 40.0% Voids = 1,475.7 cf Stone Storage
Chamber Storage + Stone Storage = 3,010.1 cf = 0.069 of
Overall Storage Efficiency = 57.6%
Overall System Size = 84.75' x 24.25' x 2.54'
56 Chambers
193.5 cy Field
136.6 cy Stone
68

Highlands Postconstruction w smaller Chambers Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 34
Pond 150XLHD: Cultec detention system - Chamber Wizard Field C
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 5 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
2 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 21.25' Row Length +12.0" End Stone x 2 =
23.25' Base Length
5 Rows x 33.0" Wide + 6.0" Spacing x 4 + 12.0" Side Stone x 2 = 17.75' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
10 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 5 Rows = 281.5 cf Chamber Storage
1,048.9 cf Field - 281.5 cf Chambers = 767.5 cf Stone x 40.0% Voids = 307.0 cf Stone Storage
Chamber Storage + Stone Storage = 588.4 cf = 0.014 of
Overall Storage Efficiency = 56.1 %
Overall System Size = 23.25' x 17.75' x 2.54'
10 Chambers
38.8 cy Field
28.4 cy Stone
69

Highlands Postconstruction w smaller Chambers Type 111 24-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD® 10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 35
Pond 150XLHD: Cultec detention system
Hydrograph
5.69 cfs
TITIT - T
LILT
4
N
3 3
0
LL
2
III'
1
0 1 2 3 4 5 6
❑ Inflow
❑ Primary
Inflow Area=30,572 sf
T I Peak Elev=4,022.95'
Storage=3,914 cf
I-
1.90 cfs
-� at
�IIIIIIIIIIIIIII
10 11 12 13 14 15 16 17 18
Time (hours)
23 24 25 26 27 28 29 30
70

Highlands Postconstruction w smaller Chambers Type 11124-hr 5-yr Rainfall= 7.13 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 36
Summary for Link POST: Postconstruction Site Discharge
Inflow Area = 168,784 sf, 27.62% Impervious, Inflow Depth = 2.94" for 5-yr event
Inflow = 9.15 cfs @ 12.04 hrs, Volume= 41,354 cf
Primary = 9.15 cfs @ 12.04 hrs, Volume= 41,354 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
0
a
U
3
0
LL
Link POST: Postconstruction Site Discharge
Hydrograph
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
Inflow
❑ Primary
71

POSTCONSTRUCTION SITE CALCULATIONS
10-YEAR STORM EVENT
72

Highlands Postconstruction w smaller Chambers Type/1/ 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 37
Summary for Subcatchment 1 S: Roof
Runoff = 2.04 cfs @ 12.02 hrs, Volume= 6,196 cf, Depth= 7.95"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 10-yr Rainfall=8.19"
Area (sf) CN Description
9,352 98
9,352 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.5 70 0.0417 2.31 Sheet Flow,
Smooth surfaces n= 0.011 P2= 5.79"
0.5 70 Total, Increased to minimum Tc = 1.2 min
Subcatchment 1S: Roof
Hydrograph
I I
2.04 cfs
2 + I� 1 I I I IT�e-li 24-hi
joLyi• Oza 1411�41191h
ROnbff AOeOiO9,3521 sf
Ruggffl Vlollugn�76,11 P61 cf
L I _L 1 _�n?j 4elp�hT7I_ 5,1�
Flow een h=
11 1 1 1 1 fib eL�g�4�17I
II �
� I I I I I T�C�1 �21 r>riir�
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
73

Highlands Postconstruction w smaller Chambers Type/1/ 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 38
Summary for Subcatchment 2EX: Offsite
Runoff = 2.90 cfs @ 12.05 hrs, Volume= 9,691 cf, Depth= 1.63"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 10-yr Rainfall=8.19"
Area (sf) CN DescriDtion
8,084
98 road
63,163
36 Woods, Fair, HSG A
71,247
43 Weighted Average
63,163
88.65% Pervious Area
8,084
11.35% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 200 0.1000 1.58 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
LO
3
0
LL
3
2
1
Subcatchment 2EX: Offsite
Hydrograph
2.90 cfs I I
I I I I ITYpeI II+ 24-1hi
I � "
'� 0 y� Rainfall 8�.19
I I I I 1 1 1 I RluiholffiAreat71,1247I sf
RUggff volurnp�%,6�1 I Cf
Runoff ulnoff Dep�h�11. 3'I
Flow Len th=2 0'
p
T�C�2 � 11 rri i r�
DN'43
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
74

Highlands Postconstruction w smaller Chambers Type/1/ 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 39
Summary for Subcatchment 2S: Delivery/Dumpster Area
Runoff = 0.69 cfs @ 12.02 hrs, Volume= 2,082 cf, Depth= 7.95"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 10-yr Rainfall=8.19"
Area (sf) CN Description
3,142 98
3,142 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.8 124 0.0150 2.49 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.8 124 Total, Increased to minimum Tc = 1.2 min
Subcatchment 2S: Delivery/Dumpster Area
Hydrograph
0.75
0.7
L
I
�
_ 0.69 cfs
L
-L-L -[ Tied I-
0.65
t 1
t
1--t l
I—
fi110�% a �f 11� 119
06
0.55
1 �
�- 1
Ri nbbffAJrie4 Z.11421 sf
T
�
-
�
PI"l, I'�I-- - ((fj-�'-- rrt� - ,,9#21cf
45
—u
Sul
R,pT7��
0.35
.2
-
LI w
O 1
t I
t- -t I 1 file jZ4� 16
0.2
.2
0.15
L 1
I
Li
1 L1
U
L_1
L I I I-L L_I LCN7-9-8
0.1
n nr
1—�
+
_
+
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
75

Highlands Postconstruction w smaller Chambers Type /// 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 40
Summary for Subcatchment 3S: North Parking/Driveway
Runoff = 1.25 cfs @ 12.02 hrs, Volume= 3,780 cf, Depth= 7.95"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 10-yr Rainfall=8.19"
Area (sf) CN Description
5,705 98
5,705 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.7 127 0.0200 2.87 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.7 127 Total, Increased to minimum Tc = 1.2 min
Subcatchment 3S: North Parking/Driveway
Hydrograph
1.25 cfs
T��e II+ 24-hi
i oLyi• lka 1411�4119'h
1 I ROnbff AOeOiO5j051 sf
Ruggffl Vlollugn�73,17g01 cf
RI u�IowLen
npf 4elp h77.9j5'I�
h=127
�.b2bb �
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
76

Highlands Postconstruction w smaller Chambers Type/1/ 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 41
Summary for Subcatchment 4S: East Driveway Aisle
Runoff = 0.67 cfs @ 12.02 hrs, Volume= 2,039 cf, Depth= 7.95"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 10-yr Rainfall=8.19"
Area (sf) CN Description
3,077 98
3,077 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.9 108 0.0090 1.93 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.9 108 Total, Increased to minimum Tc = 1.2 min
Subcatchment 4S: East Driveway Aisle
Hydrograph
❑Runoff
0.7
0.65 o.67 cfs -�T�p e�
0.55 �- 1 14 1 1 4 1 � H ft "fff-Aillei�-Ia,107-71 sf
0.4- qep�h77 5
LL 0.35 — — NOW Lenqth: 1%� 8!
0.25 0.2 fi I T I rt fi rt 1 rt fT6� 1z�ir�
0.2
0.1
'7 I __I r r--I
n nx
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
77

Highlands Postconstruction w smaller Chambers Type/1/ 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 42
Summary for Subcatchment 5S: Front Parking Area to G12
Runoff = 0.79 cfs @ 12.02 hrs, Volume= 2,395 cf, Depth= 7.95"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 10-yr Rainfall=8.19"
Area (sf) CN DescriDtion
3,615 98
3,615 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.4 70 0.0170 2.65 Shallow Concentrated Flow,
Paved Kv= 20.3 fDs
0.4 70 Total, Increased to minimum Tc = 1.2 min
Subcatchment 5S: Front Parking Area to G12
Hydrograph
+
+
1--4
+ 1 —4
❑Runoff
0.85
0.8
L I
I
I
0.79
I
cfs
L1
L-L 1�T 24Ih>
0.7
T 1
T
17 1
1 F I
-T
T I
elh�
T110Ty%:kaillrllf":61k11!Y�
0.65
t 1
t
1 rt 1
1 t-1 1
�- 1
RO nbfff-p►Out 161-51 sf
0.6
0.55
+
I
P9rh PTVPIMrpf =1z1�1'0,51 Cf
w 0.5
a 0.45
—
�Ypj�
0.4
U.
0.35
1 /���� Q / A
Wr -LVngW
1-IIIJJJ tid
j j� f
0.3
0.25
V VVV
����777 VVVV
IT6=� 12-1rril ui
0.2
0.15
T I
T
1-T
1 1-1
fi
11
r-I
T T 1 I r1 1c Nr-"
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
78

Highlands Postconstruction w smaller Chambers Type/1/ 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 43
Summary for Subcatchment 6S: Front Parking Area to Gil
Runoff = 1.14 cfs @ 12.03 hrs, Volume= 3,310 cf, Depth= 6.99"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 10-yr Rainfall=8.19"
Area (sf) CN DescriDtion
1,138
60 Avg. of Woods/grass & Newly graded, HSG A
4,543
98
5,681
90 Weighted Average
1,138
20.03% Pervious Area
4,543
79.97% Impervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
1.7
21
0.2500
0.21
Sheet Flow,
Grass: Bermuda n= 0.410 P2= 5.79"
0.5
51
0.0080
1.82
Shallow Concentrated Flow,
Paved Kv= 20.3 fps
2.2
72
Total
N
3
LL
Subcatchment 6S: Front Parking Area to Gil
1 [�-1 t l t l--� h t
Hydrograph
2� 1 Typel Ili 24-h%
t I tiOOLyr Rai nfal1�4.119'I'
ROnbff Ate&�5,16611 sf
Ruggffl Viol,um�73,13101 cf
Rulnoff Qeip�h7f-9;9'
Flow Length=72'
Tc-12 ni i 6
t'N=19b
Illlllli
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
79

Highlands Postconstruction w smaller Chambers Type/1/ 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 44
Summary for Subcatchment 7S: Septic Area
Runoff = 0.95 cfs @ 12.03 hrs, Volume= 2,939 cf, Depth= 1.84"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 10-yr Rainfall=8.19"
Area (sf) CN DescriDtion
2,401 60 Avg. of Woods/Grass & Newly graded, HSG A
16,794 43 Woods/grass comb., Fair, HSG A
19,195 45 Weighted Average
19,195 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.9 230 0.0730 4.05 Shallow Concentrated Flow,
Grassed Waterwav Kv= 15.0 fos
0.9 230 Total, Increased to minimum Tc = 1.2 min
Subcatchment 7S: Septic Area
Hydrograph
0.95 cfs l��I
'TYpeI II+ 24!hi•
JOLyr Rain6ll- 8.119'I'
RIu hdff Area=19,1951 sf
RuggfflVollume72,19�91 cf
Ruln? j Pe,p�h7l,. 4'I�
LL Flow Length=2 0
Slope=0.0730 T
"T'c�1 L21 mirk
1 I I CN=145
Time (hours)
❑ Runoff
80

Highlands Postconstruction w smaller Chambers Type/1/ 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 45
Summary for Subcatchment 8S: NW Wetland Area
Runoff = 1.76 cfs @ 12.05 hrs, Volume= 4,925 cf, Depth= 3.59"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 10-yr Rainfall=8.19"
Area (sf) CN DescriDtion
331 60 Avg. of Woods/Grass & Newly Graded, HSG A
2,664 83 Avg. of Woods/Grass & Newly Graded, HSG C
8,086 43 Woods/grass comb., Fair, HSG A
5,379 76 Woods/grass comb., Fair, HSG C
16,460 61 Weighted Average
16,460 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
3.0 226 0.0070 1.25 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 8S: NW Wetland Area
Hydrograph
1.76 cfs l��I
I I I I ITYpeI II+ 24!hir
I JOLyi• 061411�41I9111
RluhdfflAlrOa�--116,I460I sf
Ruggffl Vollugnp=4,9?51 cf
0RT1r
�e,plh= ' YI,
- Flow Len th=2�6
LL
�1b�eL0.00�d
T6=631.01 nil16
I CN=I61
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
81

Highlands Postconstruction w smaller Chambers Type/1/ 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 46
Summary for Subcatchment 9S: Cherrywood Dr/Driveway
Runoff = 3.37 cfs @ 12.03 hrs, Volume= 9,243 cf, Depth= 6.04"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 10-yr Rainfall=8.19"
Area (sf) CN DescriDtion
2,293
60
Avg. of Woods/Grass & Newly Graded, HSG A
4,911
83
Avg. of Woods/Grass & Newly Graded, HSG C
4,885
98
6,273
76
Woods/grass comb., Fair, HSG C
18,362
82
Weighted Average
13,477
73.40% Pervious Area
4,885
26.60% Impervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
2.0 256 0.0200 2.12 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 9S: Cherrywood Dr/Driveway
Hydrograph
3
3
2
LL
IIIIIIIII
TT T T T
i i I I � Runoff
3.37 cfs
ITY eI II+ 241hi
T M T I T -OLyi• h"i fill1�= 9'1'
Rluihdffl AlrOa$118,13621 sf
Ruggffl VlolluT�79,I2431 cf
Rulnoff Delpth=C.04'I
Flow Length=256'
§160eL0.0260 'i'
+ T 1 - T640tn irk
1 1 CND=182
o
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
82

Highlands Postconstruction w smaller Chambers Type/1/ 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 47
Summary for Subcatchment 10S: Cashiers Rd. R.O.W.
Runoff = 1.81 cfs @ 12.03 hrs, Volume= 4,868 cf, Depth= 4.51"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 10-yr Rainfall=8.19"
Area (sf) CN DescriDtion
5,907 60 Avg. of Woods/Grass & Newly Graded, HSG A
4,208 98
2,833 43 Woods/grass comb., Fair, HSG A
12,948 69 Weighted Average
8,740 67.50% Pervious Area
4,208 32.50% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 383 0.0430 3.11 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 10S: Cashiers Rd. R.O.W.
Hydrograph
2 T— I t
1.81 cfs l��I
I I I I ITYpeI II+ 24!hir
1 1 1 I I 'COLy i• 061411�41I9111
RluhdfflAlrOa�--112,1948I sf
l l Ruggffl Vollugnp=4,8g81 cf
0R7?j
1 �elpth=4. 'I,.2 ow Length=3 3
�1b�eL0.041d'�'
T6=621.1 ni i 6
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
83

Highlands Postconstruction w smaller Chambers Type 111 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD® 10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 48
Summary for Pond 150XLHD: Cultec detention system
Inflow Area =
30,572 sf,
96.28% Impervious,
Inflow Depth = 7.77" for 10-yr event
Inflow =
6.55 cfs @
12.02 hrs, Volume=
19,801 cf
Outflow =
2.68 cfs @
12.14 hrs, Volume=
19,800 cf, Atten= 59%, Lag= 7.1 min
Primary =
2.68 cfs @
12.14 hrs, Volume=
19,800 cf
Routing by Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Peak Elev= 4,023.13' @ 12.14 hrs Surf.Area= 3,736 sf Storage= 4,299 cf
Plug -Flow detention time= 31.5 min calculated for 19,800 cf (100% of inflow)
Center -of -Mass det. time= 31.5 min ( 773.9 - 742.4 )
Volume
Invert
Avail.Storage
Storage Description
#1A
4,021.25'
687 cf
40.50'W x 23.25'L x 2.54'H Field A
2,393 cf Overall - 675 cf Embedded = 1,718 cf x 40.0% Voids
#2A
4,021.75'
675 cf
Cultec R-150XLHD x 24 Inside #1
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 12 rows
#313
4,021.25'
1,476 cf
24.25'W x 84.75'L x 2.54'H Field B
5,224 cf Overall - 1,534 cf Embedded = 3,689 cf x 40.0% Voids
#413
4,021.75'
1,534 cf
Cultec R-150XLHD x 56 Inside #3
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 7 rows
#5C
4,021.25'
307 cf
17.75'W x 23.25'L x 2.54'H Field C
1,049 cf Overall - 281 cf Embedded = 767 cf x 40.0% Voids
#6C
4,021.75'
281 cf
Cultec R-150XLHD x 10 Inside #5
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 5 rows
#7
4,021.65'
8 cf
12.0" Round 10 LF 12" HDPE
L= 10.0' S= 0.0083 T
#8
4,021.80'
56 cf
4.00'D x 4.49'H J131
#9
4,021.90'
76 cf
18.0" Round 43 LF 18" HDPE
L= 43.0' S= 0.0100 T
#10
4,022.37'
48 cf
4.00'D x 3.83'H G11
#11
4,022.47'
138 cf
18.0" Round 78 LF 18" HDPE
L= 78.0' S= 0.0100 '/'
#12
4,023.29'
36 cf
4.00'D x 2.83'H G11
#13
4,021.80'
44 cf
4.00'D x 3.49'H G14
#14
4,021.90'
102 cf
18.0" Round 58 LF 18" HDPE
L= 58.0' S= 0.0100 T
#15
4,022.51'
40 cf
4.00'D x 3.18'H G13
#16
4,021.94'
40 cf
4.00'D x 3.20'H J132
#17
4,022.04'
40 cf
15.0" Round 33 LF 15" HDPE
L= 33.0' S= 0.0100 T
#18
4,022.41'
37 cf
4.00'D x 2.96'H G15
5,627 cf
Total Available Storage
Storage Group A created with Chamber Wizard
84

Highlands Postconstruction w smaller Chambers Type 111 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD® 10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 49
Storage Group B created with Chamber Wizard
Storage Group C created with Chamber Wizard
Device
Routing
Invert
Outlet Devices
#1
Primary
4,021.15'
18.0" Round Culvert L= 4.0' Ke= 0.500
Inlet / Outlet Invert= 4,021.15' / 4,021.10' S= 0.0125 '/' Cc= 0.900
n= 0.012, Flow Area= 1.77 sf
#2
Device 1
4,021.25'
6.0" W x 6.0" H Vert. Orifice C= 0.600
#3
Device 1
4,022.75'
1.5' long Weir 2 End Contraction(s) 1.0' Crest Height
#4
Device 1
4,023.75'
5.0' long Top of Wall 2 End Contraction(s)
Primary OutFlow Max=2.68 cfs @ 12.14 hrs HW=4,023.13' (Free Discharge)
L =Culvert (Passes 2.68 cfs of 8.38 cfs potential flow)
2=Orifice (Orifice Controls 1.54 cfs @ 6.14 fps)
3=Weir (Weir Controls 1.14 cfs @ 2.11 fps)
4=Top of Wall ( Controls 0.00 cfs)
85

Highlands Postconstruction w smaller Chambers Type/1/ 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 50
Pond 150XLHD: Cultec detention system - Chamber Wizard Field A
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 12 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
2 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 21.25' Row Length +12.0" End Stone x 2 =
23.25' Base Length
12 Rows x 33.0" Wide + 6.0" Spacing x 11 + 12.0" Side Stone x 2 = 40.50' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
24 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 12 Rows = 675.5 cf Chamber Storage
2,393.3 cf Field - 675.5 cf Chambers = 1,717.8 cf Stone x 40.0% Voids = 687.1 cf Stone Storage
Chamber Storage + Stone Storage = 1,362.6 cf = 0.031 of
Overall Storage Efficiency = 56.9%
Overall System Size = 23.25' x 40.50' x 2.54'
24 Chambers
88.6 cy Field
63.6 cy Stone
09,

Highlands Postconstruction w smaller Chambers Type/1/ 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 51
Pond 150XLHD: Cultec detention system - Chamber Wizard Field B
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 7 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
8 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 82.75' Row Length +12.0" End Stone x 2 =
84.75' Base Length
7 Rows x 33.0" Wide + 6.0" Spacing x 6 + 12.0" Side Stone x 2 = 24.25' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
56 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 7 Rows = 1,534.4 cf Chamber Storage
5,223.6 cf Field - 1,534.4 cf Chambers = 3,689.2 cf Stone x 40.0% Voids = 1,475.7 cf Stone Storage
Chamber Storage + Stone Storage = 3,010.1 cf = 0.069 of
Overall Storage Efficiency = 57.6%
Overall System Size = 84.75' x 24.25' x 2.54'
56 Chambers
193.5 cy Field
136.6 cy Stone
87

Highlands Postconstruction w smaller Chambers Type/1/ 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 52
Pond 150XLHD: Cultec detention system - Chamber Wizard Field C
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 5 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
2 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 21.25' Row Length +12.0" End Stone x 2 =
23.25' Base Length
5 Rows x 33.0" Wide + 6.0" Spacing x 4 + 12.0" Side Stone x 2 = 17.75' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
10 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 5 Rows = 281.5 cf Chamber Storage
1,048.9 cf Field - 281.5 cf Chambers = 767.5 cf Stone x 40.0% Voids = 307.0 cf Stone Storage
Chamber Storage + Stone Storage = 588.4 cf = 0.014 of
Overall Storage Efficiency = 56.1 %
Overall System Size = 23.25' x 17.75' x 2.54'
10 Chambers
38.8 cy Field
28.4 cy Stone
88

Highlands Postconstruction w smaller Chambers Type/1/ 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 53
Pond 150XLHD: Cultec detention system
Hydrograph
6.55 cfs L
7 �a�fl�o-�ry Q►re�a-�,�-71--s�
6 I I I I I I I IP�k1 bi6v=�,�0�31.43�
5 Sfoir ge 4,290 6t
14 I--4 HLO
I�
4 �I I-1 L_I LI
3
0
LL 3 2.68 cfs
2
L
�IIIIIIIIIIIIII
J I7 F-I T-ITITI7 I-
1
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Time (hours)
21 22 23 24 25 26 27 28 29 30
Inflow
❑ Primary
89

Highlands Postconstruction w smaller Chambers Type 111 24-hr 10-yr Rainfall=8.19"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD® 10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 54
Summary for Link POST: Postconstruction Site Discharge
Inflow Area = 168,784 sf, 27.62% Impervious, Inflow Depth = 3.66" for 10-yr event
Inflow = 12.22 cfs @ 12.04 hrs, Volume= 51,466 cf
Primary = 12.22 cfs @ 12.04 hrs, Volume= 51,466 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Link POST: Postconstruction Site Discharge
Hydrograph
❑ Inflow
❑ Primary
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
90

POSTCONSTRUCTION SITE CALCULATIONS
25-YEAR STORM EVENT
91

Highlands Postconstruction w smaller Chambers Type 111 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 55
Summary for Subcatchment 1 S: Roof
Runoff = 2.42 cfs @ 12.02 hrs, Volume= 7,356 cf, Depth= 9.44"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 25-yr Rainfall=9.68"
Area (sf) CN Description
9,352 98
9,352 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.5 70 0.0417 2.31 Sheet Flow,
Smooth surfaces n= 0.011 P2= 5.79"
0.5
0
70 Total, Increased to minimum Tc = 1.2 min
t I I—t I--
Subcatchment 1S: Roof
Hydrograph
2.42 cfs
1 Tyi�e1 III 24-hi
110 nbff AOeOiO9,13521 sf
Ruggffl Vlolluln�77,13�61 cf
IIII I I Ri ulnp �.e,p�h7�- 4'FI
ogth 0,
fit rt I� w en �Ib eL'64 '1'
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
92

Highlands Postconstruction w smaller Chambers Type 111 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 56
Summary for Subcatchment 2EX: Offsite
Runoff = 4.77 cfs @ 12.04 hrs, Volume= 14,461 cf, Depth= 2.44"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 25-yr Rainfall=9.68"
Area (sf) CN DescriDtion
8,084
98 road
63,163
36 Woods, Fair, HSG A
71,247
43 Weighted Average
63,163
88.65% Pervious Area
8,084
11.35% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 200 0.1000 1.58 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
Subcatchment 2EX: Offsite
Hydrograph
IIIIIIIIIII' I III III
5 4.77 cfs
I 1 ley 1pe III �4 h%
4 -t L -t L I I I2$_yr]R�Wall=d.68-�'
R4npff 4rpa�=71 j2471 sf
-4 H 4R1un�off�VQl�rn�e7-�4�4�11 cl
w 3 Runoff Depth=2.44"
o f IIII 1 1 1 IFiow L�nJ tkl266'
2 l fi l rt l IS14-6.1Odd 11'
1 1 1 Tc7g-1 mirk
1
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
■ Runoff
93

Highlands Postconstruction w smaller Chambers Type 111 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 57
Summary for Subcatchment 2S: Delivery/Dumpster Area
Runoff = 0.81 cfs @ 12.02 hrs, Volume= 2,472 cf, Depth= 9.44"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 25-yr Rainfall=9.68"
Area (sf) CN Description
3,142 98
3,142 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.8 124 0.0150 2.49 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.8 124 Total, Increased to minimum Tc = 1.2 min
Subcatchment 2S: Delivery/Dumpster Area
Hydrograph
0.9
fiITI
1111
1111
111 1�-1T
0.85
os
tITI�
0.81
cfs
�I
t tI�
T e�Ii iA 1h
°o7
I�
�I
—
0.65
- 1
+
14
4
I--]
H�Jffnf
bbfff-Aille�=-a,{1�421 Sf
0.6 0.55
1
T
1
�l �P-�- -�TP 'I -"
0.5
0 045
Li
T
1-
�
I�
LI
L Ip r_'�
-
LL 0.35
T 1
T
1
I 1
TI
1- w L n h=124
T T eL,
0.3
0.25
T
I
I
I—
-I
- — - ��� 12 r�j6
02
1 fi 1
T
I�
1-1
r- 1
-r T 1 rt r1 �N--"
0.15
0.1
/
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
94

Highlands Postconstruction w smaller Chambers Type /// 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 58
Summary for Subcatchment 3S: North Parking/Driveway
Runoff = 1.48 cfs @ 12.02 hrs, Volume= 4,488 cf, Depth= 9.44"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 25-yr Rainfall=9.68"
Area (sf) CN Description
5,705 98
5,705 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.7 127 0.0200 2.87 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.7 127 Total, Increased to minimum Tc = 1.2 min
Subcatchment 3S: North Parking/Driveway
Hydrograph
1.48 cfs
Tyi�e1Ili 24-hi
�5Lyi•
110nbff A te�iO5,17Q51 sf
1Iu�QVl�lue7-4,181C
IIII 1 Ri uln?j 4e,p�h7�.4'I;
Flow Len h=1�7
IIII 1 I I I �Ib eL�.b2bb'�'
� I I I I I T�C�1 �21 r>riir�
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
95

Highlands Postconstruction w smaller Chambers Type 111 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 59
Summary for Subcatchment 4S: East Driveway Aisle
Runoff = 0.80 cfs @ 12.02 hrs, Volume= 2,420 cf, Depth= 9.44"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 25-yr Rainfall=9.68"
Area (sf) CN Description
3,077 98
3,077 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.9 108 0.0090 1.93 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.9 108 Total, Increased to minimum Tc = 1.2 min
Subcatchment 4S: East Driveway Aisle
Hydrograph
0.85
0.80 cfs
°.75
o;
fi l
rt
l
11 rt
I�
�I5y%afa�ll�6�
0.65
t 1
t
1--�
l 1 1
�- 1R-0
nbff -AOe--a,107-71 sf
0.6
0.55
- 1
+
14
H 1 4
PW1 PTVOUTJ° ?WOO Cf
0.45
14-
0.35
L I
I-i
L
L 1
L 1 I
0.3
0.25
IT6:�-1 ii rril ui
0.2
0.15
fi 1
T
-r rt I I I 1�-c Nf-"
0.1
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
96

Highlands Postconstruction w smaller Chambers Type 111 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 60
Summary for Subcatchment 5S: Front Parking Area to G12
Runoff = 0.93 cfs @ 12.02 hrs, Volume= 2,844 cf, Depth= 9.44"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 25-yr Rainfall=9.68"
Area (sf) CN Description
3,615 98
3,615 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.4 70 0.0170 2.65 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.4 70 Total, Increased to minimum Tc = 1.2 min
Subcatchment 5S: Front Parking Area to G12
Hydrograph
— �-
1 0.93 cfs
I I I I I Tyi�e1Ili 24-hi
I �5Lyi•
110 nbff Me0103,16151 sf
R u gaff l Vlollu ln�72,18441 c f
IIII 1 Ri uln?j �.e,p�h7�4'LL FI w en h� ,
�b�edd d�
� I I I I I T�C�1 �21 r>riir�
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
97

Highlands Postconstruction w smaller Chambers Type 111 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 61
Summary for Subcatchment 6S: Front Parking Area to Gil
Runoff = 1.37 cfs @ 12.03 hrs, Volume= 4,007 cf, Depth= 8.46"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 25-yr Rainfall=9.68"
Area (sf) CN DescriDtion
1,138
60 Avg. of Woods/grass & Newly graded, HSG A
4,543
98
5,681
90 Weighted Average
1,138
20.03% Pervious Area
4,543
79.97% Impervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
1.7
21
0.2500
0.21
Sheet Flow,
Grass: Bermuda n= 0.410 P2= 5.79"
0.5
51
0.0080
1.82
Shallow Concentrated Flow,
Paved Kv= 20.3 fps
2.2
72
Total
Subcatchment 6S: Front Parking Area to Gil
Hydrograph
1.37 cfs
Type1 III 24-hr
l l l l �5Lyr Rainfall=9.68"
—I I -ROnbff Ate&�5,16-81IV
u Iff Volum 4 0 7 II III I I I I�mQ I � � ����IQI c f
Runoff Qeip�h�A,6'i,
LL Flow Length=72
t'N=19b
I' Illlllli
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
98

Highlands Postconstruction w smaller Chambers Type 111 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 62
Summary for Subcatchment 7S: Septic Area
Runoff = 1.51 cfs @ 12.02 hrs, Volume= 4,304 cf, Depth= 2.69"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 25-yr Rainfall=9.68"
Area (sf) CN DescriDtion
2,401 60 Avg. of Woods/Grass & Newly graded, HSG A
16,794 43 Woods/grass comb., Fair, HSG A
19,195 45 Weighted Average
19,195 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.9 230 0.0730 4.05 Shallow Concentrated Flow,
Grassed Waterwav Kv= 15.0 fos
0.9 230 Total, Increased to minimum Tc = 1.2 min
1
in
LL
Subcatchment 7S: Septic Area
Hydrograph
1.51 cfs
'TeeIlli 241hi•
�5Lyr Rain611§.68'I'
RluhdfflArea=19,195, sf
�upgffj Vloilume74,1394j cf
l l Ruln? j Pe,p�h7?. 9'I'
Flow Length=2 0
Slope=0.0730 T
Time (hours)
❑ Runoff
99

Highlands Postconstruction w smaller Chambers Type 111 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 63
Summary for Subcatchment 8S: NW Wetland Area
Runoff = 2.35 cfs @ 12.05 hrs, Volume= 6,544 cf, Depth= 4.77"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 25-yr Rainfall=9.68"
Area (sf) CN DescriDtion
331 60 Avg. of Woods/Grass & Newly Graded, HSG A
2,664 83 Avg. of Woods/Grass & Newly Graded, HSG C
8,086 43 Woods/grass comb., Fair, HSG A
5,379 76 Woods/grass comb., Fair, HSG C
16,460 61 Weighted Average
16,460 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
3.0 226 0.0070 1.25 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 8S: NW Wetland Area
Hydrograph
1
� I-
3
0
LL 1 IT I_ T
❑ Runoff
ITYpeI II+ 24!hir
1 �5�y% litaii-rif�]1l 461-wv
RluhdfflAlrOa�116,14601 sf
RuggfflVolium p=6,5441 cf
Runoff Depth=4.7I7'I
Flow Length=226'
T T IT �loeLo.od �
T6=6314 nil16
I I CN=161
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
100

Highlands Postconstruction w smaller Chambers Type 111 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 64
Summary for Subcatchment 9S: Cherrywood Dr/Driveway
Runoff = 4.12 cfs @ 12.03 hrs, Volume= 11,426 cf, Depth= 7.47"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 25-yr Rainfall=9.68"
Area (sf) CN DescriDtion
2,293
60
Avg. of Woods/Grass & Newly Graded, HSG A
4,911
83
Avg. of Woods/Grass & Newly Graded, HSG C
4,885
98
6,273
76
Woods/grass comb., Fair, HSG C
18,362
82
Weighted Average
13,477
73.40% Pervious Area
4,885
26.60% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.0 256 0.0200 2.12 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 9S: Cherrywood Dr/Driveway
Hydrograph
4.12 cfs
4 Type III 24-hr
12$-err Rainfall=9.68"
- I -Rpnpff Area��t8,3621-Sf
3 RMni Q�
off V I m- 1 4 c
I IIe�� ��6I
Runoff Depth=7.47"
3 Flow ength=256'
2 �I
Slope=6.0200 T
o
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
101

Highlands Postconstruction w smaller Chambers Type 111 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 65
Summary for Subcatchment 10S: Cashiers Rd. R.O.W.
Runoff = 2.33 cfs @ 12.03 hrs, Volume= 6,268 cf, Depth= 5.81"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 25-yr Rainfall=9.68"
Area (sf) CN DescriDtion
5,907 60 Avg. of Woods/Grass & Newly Graded, HSG A
4,208 98
2,833 43 Woods/grass comb., Fair, HSG A
12,948 69 Weighted Average
8,740 67.50% Pervious Area
4,208 32.50% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 383 0.0430 3.11 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 10S: Cashiers Rd. R.O.W.
Hydrograph
2.33 cfs l��I
ITYpeI Ili 24=hir
�I 2 -4 H
7
RluhdfflAlrOa�112,1948I sf
RuggfflVolium p=6,2g8i cf
1 Run
off Depth=5.81"
LL Length=3831'
1 -t �1o�eL0.041d')'
T6=621.1 ni i 6
CPI=I69
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
102

Highlands Postconstruction w smaller Chambers Type/1/ 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD® 10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 66
Summary for Pond 150XLHD: Cultec detention system
Inflow Area =
30,572 sf,
96.28% Impervious,
Inflow Depth = 9.26" for 25-yr event
Inflow =
7.76 cfs @
12.02 hrs, Volume=
23,586 cf
Outflow =
4.25 cfs @
12.10 hrs, Volume=
23,586 cf, Atten= 45%, Lag= 4.9 min
Primary =
4.25 cfs @
12.10 hrs, Volume=
23,586 cf
Routing by Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Peak Elev= 4,023.41' @ 12.10 hrs Surf.Area= 3,720 sf Storage= 4,787 cf
Plug -Flow detention time= 29.8 min calculated for 23,586 cf (100% of inflow)
Center -of -Mass det. time= 29.7 min ( 769.8 - 740.1 )
Volume
Invert
Avail.Storage
Storage Description
#1A
4,021.25'
687 cf
40.50'W x 23.25'L x 2.54'H Field A
2,393 cf Overall - 675 cf Embedded = 1,718 cf x 40.0% Voids
#2A
4,021.75'
675 cf
Cultec R-150XLHD x 24 Inside #1
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 12 rows
#313
4,021.25'
1,476 cf
24.25'W x 84.75'L x 2.54'H Field B
5,224 cf Overall - 1,534 cf Embedded = 3,689 cf x 40.0% Voids
#413
4,021.75'
1,534 cf
Cultec R-150XLHD x 56 Inside #3
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 7 rows
#5C
4,021.25'
307 cf
17.75'W x 23.25'L x 2.54'H Field C
1,049 cf Overall - 281 cf Embedded = 767 cf x 40.0% Voids
#6C
4,021.75'
281 cf
Cultec R-150XLHD x 10 Inside #5
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 5 rows
#7
4,021.65'
8 cf
12.0" Round 10 LF 12" HDPE
L= 10.0' S= 0.0083 T
#8
4,021.80'
56 cf
4.00'D x 4.49'H J131
#9
4,021.90'
76 cf
18.0" Round 43 LF 18" HDPE
L= 43.0' S= 0.0100 T
#10
4,022.37'
48 cf
4.00'D x 3.83'H G11
#11
4,022.47'
138 cf
18.0" Round 78 LF 18" HDPE
L= 78.0' S= 0.0100 '/'
#12
4,023.29'
36 cf
4.00'D x 2.83'H G11
#13
4,021.80'
44 cf
4.00'D x 3.49'H G14
#14
4,021.90'
102 cf
18.0" Round 58 LF 18" HDPE
L= 58.0' S= 0.0100 T
#15
4,022.51'
40 cf
4.00'D x 3.18'H G13
#16
4,021.94'
40 cf
4.00'D x 3.20'H J132
#17
4,022.04'
40 cf
15.0" Round 33 LF 15" HDPE
L= 33.0' S= 0.0100 T
#18
4,022.41'
37 cf
4.00'D x 2.96'H G15
5,627 cf
Total Available Storage
Storage Group A created with Chamber Wizard
103

Highlands Postconstruction w smaller Chambers Type/1/ 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD® 10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 67
Storage Group B created with Chamber Wizard
Storage Group C created with Chamber Wizard
Device
Routing
Invert
Outlet Devices
#1
Primary
4,021.15'
18.0" Round Culvert L= 4.0' Ke= 0.500
Inlet / Outlet Invert= 4,021.15' / 4,021.10' S= 0.0125 '/' Cc= 0.900
n= 0.012, Flow Area= 1.77 sf
#2
Device 1
4,021.25'
6.0" W x 6.0" H Vert. Orifice C= 0.600
#3
Device 1
4,022.75'
1.5' long Weir 2 End Contraction(s) 1.0' Crest Height
#4
Device 1
4,023.75'
5.0' long Top of Wall 2 End Contraction(s)
Primary OutFlow Max=4.25 cfs @ 12.10 hrs HW=4,023.41' (Free Discharge)
L =Culvert (Passes 4.25 cfs of 10.20 cfs potential flow)
2=Orifice (Orifice Controls 1.66 cfs @ 6.65 fps)
3=Weir (Weir Controls 2.58 cfs @ 2.87 fps)
4=Top of Wall ( Controls 0.00 cfs)
104

Highlands Postconstruction w smaller Chambers Type 111 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
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Pond 150XLHD: Cultec detention system - Chamber Wizard Field A
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 12 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
2 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 21.25' Row Length +12.0" End Stone x 2 =
23.25' Base Length
12 Rows x 33.0" Wide + 6.0" Spacing x 11 + 12.0" Side Stone x 2 = 40.50' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
24 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 12 Rows = 675.5 cf Chamber Storage
2,393.3 cf Field - 675.5 cf Chambers = 1,717.8 cf Stone x 40.0% Voids = 687.1 cf Stone Storage
Chamber Storage + Stone Storage = 1,362.6 cf = 0.031 of
Overall Storage Efficiency = 56.9%
Overall System Size = 23.25' x 40.50' x 2.54'
24 Chambers
88.6 cy Field
63.6 cy Stone
105

Highlands Postconstruction w smaller Chambers Type 111 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
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Pond 150XLHD: Cultec detention system - Chamber Wizard Field B
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 7 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
8 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 82.75' Row Length +12.0" End Stone x 2 =
84.75' Base Length
7 Rows x 33.0" Wide + 6.0" Spacing x 6 + 12.0" Side Stone x 2 = 24.25' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
56 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 7 Rows = 1,534.4 cf Chamber Storage
5,223.6 cf Field - 1,534.4 cf Chambers = 3,689.2 cf Stone x 40.0% Voids = 1,475.7 cf Stone Storage
Chamber Storage + Stone Storage = 3,010.1 cf = 0.069 of
Overall Storage Efficiency = 57.6%
Overall System Size = 84.75' x 24.25' x 2.54'
56 Chambers
193.5 cy Field
136.6 cy Stone
106

Highlands Postconstruction w smaller Chambers Type 111 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
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Pond 150XLHD: Cultec detention system - Chamber Wizard Field C
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 5 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
2 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 21.25' Row Length +12.0" End Stone x 2 =
23.25' Base Length
5 Rows x 33.0" Wide + 6.0" Spacing x 4 + 12.0" Side Stone x 2 = 17.75' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
10 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 5 Rows = 281.5 cf Chamber Storage
1,048.9 cf Field - 281.5 cf Chambers = 767.5 cf Stone x 40.0% Voids = 307.0 cf Stone Storage
Chamber Storage + Stone Storage = 588.4 cf = 0.014 of
Overall Storage Efficiency = 56.1 %
Overall System Size = 23.25' x 17.75' x 2.54'
10 Chambers
38.8 cy Field
28.4 cy Stone
107

Highlands Postconstruction w smaller Chambers Type 111 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
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Pond 150XLHD: Cultec detention system
Hydrograph
I I I I I I I I I I I I I I I I I I I I I I I I I I
7.76 cfs
7 IIIIIIIIIII
IIIIIIIIII�
6
IIIIIIII
5 I TITIT17 4.25cfS
0 4-
3
v.I fi l� l rt
ti t I
2
n
0 1 2 3 4 5
I Itift W1 IA%6aL30,672Isf
IPie k1 EI�v1= ,b�3L�1
I I Sfo%alg6:�4,1816t
IIIIIIIIIIIIIII
I7F-ITITITI7
Irtlrt I� r-I fil _­Irt I__�
ItIt I-
+I-+ I—i _I ­_I +I+ I-
10 11 12 13 14 15 16 17 18
Time (hours)
23 24 25 26 27 28 29 30
Inflow
❑ Primary
108

Highlands Postconstruction w smaller Chambers Type 111 24-hr 25-yr Rainfall=9.68"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 72
Summary for Link POST: Postconstruction Site Discharge
Inflow Area = 168,784 sf, 27.62% Impervious, Inflow Depth = 4.73" for 25-yr event
Inflow = 17.80 cfs @ 12.05 hrs, Volume= 66,588 cf
Primary = 17.80 cfs @ 12.05 hrs, Volume= 66,588 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Link POST: Postconstruction Site Discharge
Hydrograph
19
18
4- 14 1 17.80
_
cfs
16
15
14
13
12
U 11
10
+
3
9
LL
8
- - -
7
6
XLI
-L I A
5
4
3
f
_ � � �
❑Inflow
El Primary
4-14
1-4
1 I � 14-1
4-
1 �
I�
�
H
+- I +
14
I�
7
17
17 T-I
TIT
I-1
I7
F
-1
U LI
A
-1
L-1
L
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
109

POSTCONSTRUCTION SITE CALCULATIONS
50-YEAR STORM EVENT
i`n

Highlands Postconstruction w smaller Chambers Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 73
Summary for Subcatchment 1 S: Roof
Runoff = 2.72 cfs @ 12.02 hrs, Volume= 8,307 cf, Depth=10.66"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 50-yr Rainfall=10.90"
Area (sf) CN Description
9,352 98
9,352 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.5 70 0.0417 2.31 Sheet Flow,
Smooth surfaces n= 0.011 P2= 5.79"
3
0
LL
0.5
3
0
0&
0
70 Total, Increased to minimum Tc = 1.2 min
Subcatchment 1S: Roof
Hydrograph
1 t I t —F I—T I fi l --r I--� 1 t I t I�
I I I I I I I I 2.72 cfs I I I I I I I I I ��
T e II+ 24-hir
�6-�r IR�Ik6h=i O.9&
l -4 -4 1-RUnbff-4ife0i=9,1521-sf
Ruggffl Vlollugne78,13Q71 cf
Lq.�js'I
Flowen h=7
1 1 1 t L g��0;,
I T�C�1 �21 r>riir�
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
liiffil

Highlands Postconstruction w smaller Chambers Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 74
Summary for Subcatchment 2EX: Offsite
Runoff = 6.46 cfs @ 12.04 hrs, Volume= 18,786 cf, Depth= 3.16"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 50-yr Rainfall=10.90"
Area (sf) CN DescriDtion
8,084
98 road
63,163
36 Woods, Fair, HSG A
71,247
43 Weighted Average
63,163
88.65% Pervious Area
8,084
11.35% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 200 0.1000 1.58 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
Subcatchment 2EX: Offsite
Hydrograph
k-I �I ' '- �I � i� � I-4
' 6.46 cfs
Type III 4h-
6 1 1 1 1 1 1 1 1 1 1 1 5O�yi Rainfall=110.0&
5 -1 -F I -g4 off#r�-aFTl;2471 sf
� �Rlun+off-Y77okim�e��8 7$6 c
3 4 1 1 1 1 (Runoff Depth=3.16"
�iow te; gtk-�26
LL 3 1 1 1 1 1 1 Slop6=0.100011'
2 T i i Tc7g-1 min
77
1
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
`sm

Highlands Postconstruction w smaller Chambers Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 75
Summary for Subcatchment 2S: Delivery/Dumpster Area
Runoff = 0.92 cfs @ 12.02 hrs, Volume= 2,791 cf, Depth=10.66"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 50-yr Rainfall=10.90"
Area (sf) CN Description
3,142 98
3,142 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.8 124 0.0150 2.49 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.8 124 Total, Increased to minimum Tc = 1.2 min
Subcatchment 2S: Delivery/Dumpster Area
Hydrograph
1 0.92 cfs
Type' III 24-hi•
1 6-yr IR�Ik6h=i O.9&
RO nbff AOeOiO30 421 sf
Ruggffl Vlollugne72j1 lj cf
o I I IIII 1 �� °f� Pgpt�=� q. s�1,
low Len h=124
I I I � I I I I I T�C�1 �21 r>riir�
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
113

Highlands Postconstruction w smaller Chambers Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 76
Summary for Subcatchment 3S: North Parking/Driveway
Runoff = 1.66 cfs @ 12.02 hrs, Volume= 5,067 cf, Depth=10.66"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 50-yr Rainfall=10.90"
Area (sf) CN Description
5,705 98
5,705 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.7 127 0.0200 2.87 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.7 127 Total, Increased to minimum Tc = 1.2 min
Subcatchment 3S: North Parking/Driveway
Hydrograph
1 1 1 I l
1.66 cfs
Ty el III24-hi•
l l l l l l l l �6-�r IR�Ik6h=i 0.9&
ROnbff McOiO5,17051 sf
L --t L I L � LRUTQf tVO1UInn��5,U? c
0 °f� Pg�t'1=1 q.�js'I;
low Len h=127
I C I I I I I T�C�1 �21 r>riir�
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
ISE]

Highlands Postconstruction w smaller Chambers Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 77
Summary for Subcatchment 4S: East Driveway Aisle
Runoff = 0.90 cfs @ 12.02 hrs, Volume= 2,733 cf, Depth=10.66"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 50-yr Rainfall=10.90"
Area (sf) CN Description
3,077 98
3,077 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.9 108 0.0090 1.93 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.9 108 Total, Increased to minimum Tc = 1.2 min
Subcatchment 4S: East Driveway Aisle
Hydrograph
0.90 cfs
Type' III 24-hi•
1 6-yr IR�Ik6h=i O.9&
ROnbff Me0103,10771 sf
Ruggffl Vlollugne72J1 31 cf
o
low Len th=1 8
IIII 1 I I I �Ib eL�.do�d ���
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
115

Highlands Postconstruction w smaller Chambers Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 78
Summary for Subcatchment 5S: Front Parking Area to G12
Runoff = 1.05 cfs @ 12.02 hrs, Volume= 3,211 cf, Depth=10.66"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 50-yr Rainfall=10.90"
Area (sf) CN Description
3,615 98
3,615 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.4 70 0.0170 2.65 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
3
0
LL
0.4 70 Total, Increased to minimum Tc = 1.2 min
Subcatchment 5S: Front Parking Area to G12
Hydrograph
1.05 cfs
1
15(�_�►r IR�iinfal�=�1 d.9�0�'
RO nbff Me0103,16151 sf
Ruggffl Vlolluln�73,1?J 11 cf
Pgpt�=j q. 6'I,
Flow Len h=7
�b�edd d�
� I I I I I T�C�1 �21 r>riir�
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
116

Highlands Postconstruction w smaller Chambers Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 79
Summary for Subcatchment 6S: Front Parking Area to Gil
Runoff = 1.55 cfs @ 12.03 hrs, Volume= 4,579 cf, Depth= 9.67"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 50-yr Rainfall=10.90"
Area (sf) CN DescriDtion
1,138
60 Avg. of Woods/grass & Newly graded, HSG A
4,543
98
5,681
90 Weighted Average
1,138
20.03% Pervious Area
4,543
79.97% Impervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
1.7
21
0.2500
0.21
Sheet Flow,
Grass: Bermuda n= 0.410 P2= 5.79"
0.5
51
0.0080
1.82
Shallow Concentrated Flow,
Paved Kv= 20.3 fps
2.2
72
Total
3
LL
Subcatchment 6S: Front Parking Area to Gil
Hydrograph
1.55 cfs
Type III 24-h%
16-�r Rai nfialkl0.9&
Rtnbff Ate&�5,16611 sf
t-R�u qf# Violpme74,1-5791-ef
RI ulnOff Qeip�h7�.6,7..
Flow Length=72'
Tc1 1.2' nA 6
t'N=19b
Illlllli
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
IMN

Highlands Postconstruction w smaller Chambers Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 80
Summary for Subcatchment 7S: Septic Area
Runoff = 2.00 cfs @ 12.02 hrs, Volume= 5,531 cf, Depth= 3.46"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 50-yr Rainfall=10.90"
Area (sf) CN DescriDtion
2,401 60 Avg. of Woods/Grass & Newly graded, HSG A
16,794 43 Woods/grass comb., Fair, HSG A
19,195 45 Weighted Average
19,195 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.9 230 0.0730 4.05 Shallow Concentrated Flow,
Grassed Waterwav Kv= 15.0 fos
0.9 230 Total, Increased to minimum Tc = 1.2 min
Subcatchment 7S: Septic Area
'�illll
U- 1
Hydrograph
2.00 cfs
T��e lli 41hi
1 6-_ r Rainfall=16.9'&
RluhdfflArea=19,195, sf
RuggfflVollume75,15�1 I cf
� I lung elp h7 619
Flow Length=2 0'
Slope=0.0730 T
CN=145
Time (hours)
■ Runoff
118

Highlands Postconstruction w smaller Chambers Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 81
Summary for Subcatchment 8S: NW Wetland Area
Runoff = 2.86 cfs @ 12.05 hrs, Volume= 7,929 cf, Depth= 5.78"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 50-yr Rainfall=10.90"
Area (sf) CN DescriDtion
331 60 Avg. of Woods/Grass & Newly Graded, HSG A
2,664 83 Avg. of Woods/Grass & Newly Graded, HSG C
8,086 43 Woods/grass comb., Fair, HSG A
5,379 76 Woods/grass comb., Fair, HSG C
16,460 61 Weighted Average
16,460 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
3.0 226 0.0070 1.25 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
3
0
LL
3
2
1
Subcatchment 8S: NW Wetland Area
Hydrograph
1 _I 1
2.86 cfs
T��e Ili 24-hir
'' i l i i' i l l I I I I I 15�_�►r IR�iinfal�=�1 �.9�0�'
RluhdfflAlrOa�--116,14601 sf
RUggfflVOW m p77,929i Cf
Runoff Depth=5.78'I
Flow Length=226'
T6=6314 nil16
I CN=161
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
Iim

Highlands Postconstruction w smaller Chambers Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 82
Summary for Subcatchment 9S: Cherrywood Dr/Driveway
Runoff = 4.73 cfs @ 12.03 hrs, Volume= 13,231 cf, Depth= 8.65"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 50-yr Rainfall=10.90"
Area (sf) CN DescriDtion
2,293
60
Avg. of Woods/Grass & Newly Graded, HSG A
4,911
83
Avg. of Woods/Grass & Newly Graded, HSG C
4,885
98
6,273
76
Woods/grass comb., Fair, HSG C
18,362
82
Weighted Average
13,477
73.40% Pervious Area
4,885
26.60% Impervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
2.0 256 0.0200 2.12 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 9S: Cherrywood Dr/Driveway
Hydrograph
4.73 cfs
4
w 3
3
0
LL
2-
0
❑ Runoff
Type III 24-hr
Rainfall=11-0.90-1'
Rgnpff Area�=18�3621 sf
�Rl-noff�VQlyme713,2�11 cl
(Runoff Depth=8.65"
Flow Length=256'
1 17 T I T I Slopd=6.0200 '/I'
I T0�=�-6 min
=P
o
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
120

Highlands Postconstruction w smaller Chambers Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 83
Summary for Subcatchment 10S: Cashiers Rd. R.O.W.
Runoff = 2.76 cfs @ 12.03 hrs, Volume= 7,447 cf, Depth= 6.90"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 50-yr Rainfall=10.90"
Area (sf) CN DescriDtion
5,907 60 Avg. of Woods/Grass & Newly Graded, HSG A
4,208 98
2,833 43 Woods/grass comb., Fair, HSG A
12,948 69 Weighted Average
8,740 67.50% Pervious Area
4,208 32.50% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 383 0.0430 3.11 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 10S: Cashiers Rd. R.O.W.
Hydrograph
3-
2
N I�� III II
3
LL
1
❑ Runoff
ITYpeI Ili 24=hir
� I Rul holffl-Arda�-- 2,19481- f
RuggfflVolium p77,447i cf
Runoff Depth=6.90'I
Flow Length=383'
T621,E nii6
CPI=169
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
121

Highlands Postconstruction w smaller Chambers Type 111 24-hr 50-yr Rainfall= 10. 90"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD® 10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 84
Summary for Pond 150XLHD: Cultec detention system
Inflow Area =
30,572 sf,
96.28% Impervious,
Inflow Depth = 10.48" for 50-yr event
Inflow =
8.75 cfs @
12.02 hrs, Volume=
26,688 cf
Outflow =
5.57 cfs @
12.09 hrs, Volume=
26,687 cf, Atten= 36%, Lag= 4.1 min
Primary =
5.57 cfs @
12.09 hrs, Volume=
26,687 cf
Routing by Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Peak Elev= 4,023.61' @ 12.09 hrs Surf.Area= 3,659 sf Storage= 5,115 cf
Plug -Flow detention time= 28.6 min calculated for 26,687 cf (100% of inflow)
Center -of -Mass det. time= 28.5 min ( 767.1 - 738.5 )
Volume
Invert
Avail.Storage
Storage Description
#1A
4,021.25'
687 cf
40.50'W x 23.25'L x 2.54'H Field A
2,393 cf Overall - 675 cf Embedded = 1,718 cf x 40.0% Voids
#2A
4,021.75'
675 cf
Cultec R-150XLHD x 24 Inside #1
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 12 rows
#313
4,021.25'
1,476 cf
24.25'W x 84.75'L x 2.54'H Field B
5,224 cf Overall - 1,534 cf Embedded = 3,689 cf x 40.0% Voids
#413
4,021.75'
1,534 cf
Cultec R-150XLHD x 56 Inside #3
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 7 rows
#5C
4,021.25'
307 cf
17.75'W x 23.25'L x 2.54'H Field C
1,049 cf Overall - 281 cf Embedded = 767 cf x 40.0% Voids
#6C
4,021.75'
281 cf
Cultec R-150XLHD x 10 Inside #5
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 5 rows
#7
4,021.65'
8 cf
12.0" Round 10 LF 12" HDPE
L= 10.0' S= 0.0083 T
#8
4,021.80'
56 cf
4.00'D x 4.49'H J131
#9
4,021.90'
76 cf
18.0" Round 43 LF 18" HDPE
L= 43.0' S= 0.0100 T
#10
4,022.37'
48 cf
4.00'D x 3.83'H G11
#11
4,022.47'
138 cf
18.0" Round 78 LF 18" HDPE
L= 78.0' S= 0.0100 '/'
#12
4,023.29'
36 cf
4.00'D x 2.83'H G11
#13
4,021.80'
44 cf
4.00'D x 3.49'H G14
#14
4,021.90'
102 cf
18.0" Round 58 LF 18" HDPE
L= 58.0' S= 0.0100 T
#15
4,022.51'
40 cf
4.00'D x 3.18'H G13
#16
4,021.94'
40 cf
4.00'D x 3.20'H J132
#17
4,022.04'
40 cf
15.0" Round 33 LF 15" HDPE
L= 33.0' S= 0.0100 T
#18
4,022.41'
37 cf
4.00'D x 2.96'H G15
5,627 cf
Total Available Storage
Storage Group A created with Chamber Wizard
`FIN

Highlands Postconstruction w smaller Chambers Type 111 24-hr 50-yr Rainfall= 10. 90"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD® 10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 85
Storage Group B created with Chamber Wizard
Storage Group C created with Chamber Wizard
Device
Routing
Invert
Outlet Devices
#1
Primary
4,021.15'
18.0" Round Culvert L= 4.0' Ke= 0.500
Inlet / Outlet Invert= 4,021.15' / 4,021.10' S= 0.0125 '/' Cc= 0.900
n= 0.012, Flow Area= 1.77 sf
#2
Device 1
4,021.25'
6.0" W x 6.0" H Vert. Orifice C= 0.600
#3
Device 1
4,022.75'
1.5' long Weir 2 End Contraction(s) 1.0' Crest Height
#4
Device 1
4,023.75'
5.0' long Top of Wall 2 End Contraction(s)
Primary OutFlow Max=5.56 cfs @ 12.09 hrs HW=4,023.61' (Free Discharge)
L =Culvert (Passes 5.56 cfs of 11.12 cfs potential flow)
2=Orifice (Orifice Controls 1.75 cfs @ 6.99 fps)
3=Weir (Weir Controls 3.81 cfs @ 3.35 fps)
4=Top of Wall ( Controls 0.00 cfs)
123

Highlands Postconstruction w smaller Chambers Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 11/22/2019
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Pond 150XLHD: Cultec detention system - Chamber Wizard Field A
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 12 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
2 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 21.25' Row Length +12.0" End Stone x 2 =
23.25' Base Length
12 Rows x 33.0" Wide + 6.0" Spacing x 11 + 12.0" Side Stone x 2 = 40.50' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
24 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 12 Rows = 675.5 cf Chamber Storage
2,393.3 cf Field - 675.5 cf Chambers = 1,717.8 cf Stone x 40.0% Voids = 687.1 cf Stone Storage
Chamber Storage + Stone Storage = 1,362.6 cf = 0.031 of
Overall Storage Efficiency = 56.9%
Overall System Size = 23.25' x 40.50' x 2.54'
24 Chambers
88.6 cy Field
63.6 cy Stone
124

Highlands Postconstruction w smaller Chambers Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 11/22/2019
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Pond 150XLHD: Cultec detention system - Chamber Wizard Field B
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 7 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
8 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 82.75' Row Length +12.0" End Stone x 2 =
84.75' Base Length
7 Rows x 33.0" Wide + 6.0" Spacing x 6 + 12.0" Side Stone x 2 = 24.25' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
56 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 7 Rows = 1,534.4 cf Chamber Storage
5,223.6 cf Field - 1,534.4 cf Chambers = 3,689.2 cf Stone x 40.0% Voids = 1,475.7 cf Stone Storage
Chamber Storage + Stone Storage = 3,010.1 cf = 0.069 of
Overall Storage Efficiency = 57.6%
Overall System Size = 84.75' x 24.25' x 2.54'
56 Chambers
193.5 cy Field
136.6 cy Stone
125

Highlands Postconstruction w smaller Chambers Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 11/22/2019
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Pond 150XLHD: Cultec detention system - Chamber Wizard Field C
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 5 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
2 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 21.25' Row Length +12.0" End Stone x 2 =
23.25' Base Length
5 Rows x 33.0" Wide + 6.0" Spacing x 4 + 12.0" Side Stone x 2 = 17.75' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
10 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 5 Rows = 281.5 cf Chamber Storage
1,048.9 cf Field - 281.5 cf Chambers = 767.5 cf Stone x 40.0% Voids = 307.0 cf Stone Storage
Chamber Storage + Stone Storage = 588.4 cf = 0.014 of
Overall Storage Efficiency = 56.1 %
Overall System Size = 23.25' x 17.75' x 2.54'
10 Chambers
38.8 cy Field
28.4 cy Stone
126

Highlands Postconstruction w smaller Chambers Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 11/22/2019
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Pond 150XLHD: Cultec detention system
Hydrograph
I I I I I I I Inflow
8.75 cfs L ❑ Primary
9 - W111 aary Q►re�a— 71 s
6 5.57 cfs
N
5 (IIIIIIIII
3 —
4 I LILI-L L IL IL LI LILILIL
3 L L L LLI
2
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
MA

Highlands Postconstruction w smaller Chambers Type 11124-hr 50-yr Rainfall= 10. 90 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 90
Summary for Link POST: Postconstruction Site Discharge
Inflow Area = 168,784 sf, 27.62% Impervious, Inflow Depth = 5.66" for 50-yr event
Inflow = 23.05 cfs @ 12.04 hrs, Volume= 79,610 cf
Primary = 23.05 cfs @ 12.04 hrs, Volume= 79,610 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Link POST: Postconstruction Site Discharge
Hydrograph
24
22
T� 14 1 A 23.05
cfs
20
IIIIII
18
16
�I 14 1-4 1
a
_14
TI T IT IT
0 12
LL
LI T I A IA
10
8
1 tI t I t 1--1 1-
6
I�IIII
4
I
❑Inflow
El Primary
I�
�I
fi 1 T
Irt
I-1
r-
I
�I
IIIIIIIIIIIII
1
4-1T
14
I�
1 1 T
IT
17 71
T IT
IT
IT
T
LIT
IA
U LI
TIT
IA
L
1 It
I�
I
t I t
I�
I�
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
128

POSTCONSTRUCTION SITE CALCULATIONS
400-YEAR STORM EVENT
129

Highlands Postconstruction w smaller Chambers Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 91
Summary for Subcatchment 1 S: Roof
Runoff = 3.02 cfs @ 12.02 hrs, Volume= 9,242 cf, Depth=11.86"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 100-yr Rainfall=12.10"
Area (sf)
CN Description
9,352
98
9,352
100.00% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
0.5 70
0.0417 2.31 Sheet Flow,
Smooth surfaces n= 0.011 P2= 5.79"
0.5 70
Total, Increased to minimum Tc = 1.2 min
Subcatchment 1S: Roof
Hydrograph
I
I
❑Runoff
3.02 cfs
-IT�e Ili 24-hi
I
I I 1 1 11 bU-�rr IR�ai%fal�=�12�.110�'
RO nbff AOeOiO9,13521 sf
17
TRIQVloilu"�12421
2
LL
lR�IlnlO7 P�ptf1=l1.86'I1
Flow Length=70
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
130

Highlands Postconstruction w smaller Chambers Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 92
Summary for Subcatchment 2EX: Offsite
Runoff = 8.23 cfs @ 12.04 hrs, Volume= 23,347 cf, Depth= 3.93"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 100-yr Rainfall=12.10"
Area (sf) CN DescriDtion
8,084
98 road
63,163
36 Woods, Fair, HSG A
71,247
43 Weighted Average
63,163
88.65% Pervious Area
8,084
11.35% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 200 0.1000 1.58 Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
Subcatchment 2EX: Offsite
-k-I+ I—t H
�- I --k I-4 �-I -k-
7
5
_o
1 LI1 I-1 L
u. 4
Hydrograph
■ Runoff
8.23 cfs I +- I + I -4 h
II`�4-h%
-4 1 I I -O&y� Raintail='lill-&
IR 4npff#re-aF-T1 j2471-sf
Runoff Depth=3.93"
1
-Fiow-L�� t�26d'
I I 11 1 U SAoia6.1 Q0-9v
1 1 11 1 Tc�=�-11 r0h)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
131

Highlands Postconstruction w smaller Chambers Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 93
Summary for Subcatchment 2S: Delivery/Dumpster Area
Runoff = 1.02 cfs @ 12.02 hrs, Volume= 3,105 cf, Depth=11.86"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 100-yr Rainfall=12.10"
Area (sf) CN Description
3,142 98
3,142 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.8 124 0.0150 2.49 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.8 124 Total, Increased to minimum Tc = 1.2 min
Subcatchment 2S: Delivery/Dumpster Area
Hydrograph
I I
1.02 cfs
I� �I IT�etl1 24-hi•
I I I 1 1 11 bU-�rr IR�ai%fal�=�12�.110�'
RO nbff Me01030 421 sf
Ruggffl Vlollugne73,11 Q51 cf
6
o 'I�
low Len h=1 4
IIII 1 I I I �Ib eL�.d1
� I I I I I T�C�1 �21 r>riir�
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
132

Highlands Postconstruction w smaller Chambers Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 94
Summary for Subcatchment 3S: North Parking/Driveway
Runoff = 1.85 cfs @ 12.02 hrs, Volume= 5,638 cf, Depth=11.86"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 100-yr Rainfall=12.10"
Area (sf) CN Description
5,705 98
5,705 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.7 127 0.0200 2.87 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.7 127 Total, Increased to minimum Tc = 1.2 min
2
0 1
LL
Subcatchment 3S: North Parking/Driveway
Hydrograph
low-my,
%m
�— I � I —� I-
Ty�el II+ 241hi
1 bU-�rr IR�ai%fal�=�12�.110�'
ROnbff McOiO5,17051 sf
Ruggffl Vlollulne75,16�81 cf
T I -��!Olf- "t�'= .':
Flow Len dh=; 7
eL�.2bb'�'
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
133

Highlands Postconstruction w smaller Chambers Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 11/22/2019
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Summary for Subcatchment 4S: East Driveway Aisle
Runoff = 1.00 cfs @ 12.02 hrs, Volume= 3,041 cf, Depth=11.86"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 100-yr Rainfall=12.10"
Area (sf) CN Description
3,077 98
3,077 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.9 108 0.0090 1.93 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.9 108 Total, Increased to minimum Tc = 1.2 min
Subcatchment 4S: East Driveway Aisle
Hydrograph
1.00 cfs
1
l
❑ Runoff
T �e II+ 24-hi
1 bb-�r IRS i%fah=ii11&
1110nbff Me0103,10771 sf
Ruggffl Vlollulne73,10411 cf
L
ow Len th=1 8
I I I �Ib eL�.do�d'i'
I I I � I I I I I T�C�1 �21 r>riir�
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
134

Highlands Postconstruction w smaller Chambers Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 96
Summary for Subcatchment 5S: Front Parking Area to G12
Runoff = 1.17 cfs @ 12.02 hrs, Volume= 3,572 cf, Depth=11.86"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 100-yr Rainfall=12.10"
Area (sf) CN Description
3,615 98
3,615 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.4 70 0.0170 2.65 Shallow Concentrated Flow,
Paved Kv= 20.3 fos
0.4 70 Total, Increased to minimum Tc = 1.2 min
Subcatchment 5S: Front Parking Area to G12
Hydrograph
1.17 cfs
1
0
LL
� IIIII
Ty aI II+ 241hi
RO nbff Me0103,16151 sf
Ruggffl Vlolluln�73,15721 cf
lR�Ilrllo7 P�ptf1=l 1 86 91
Flow Length=70
� I I I I I T�C�1 �21 r>riir�
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
135

Highlands Postconstruction w smaller Chambers Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 11/22/2019
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Summary for Subcatchment 6S: Front Parking Area to Gil
Runoff = 1.73 cfs @ 12.03 hrs, Volume= 5,142 cf, Depth=10.86"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 100-yr Rainfall=12.10"
Area (sf) CN DescriDtion
1,138
60 Avg. of Woods/grass & Newly graded, HSG A
4,543
98
5,681
90 Weighted Average
1,138
20.03% Pervious Area
4,543
79.97% Impervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
1.7
21
0.2500
0.21
Sheet Flow,
Grass: Bermuda n= 0.410 P2= 5.79"
0.5
51
0.0080
1.82
Shallow Concentrated Flow,
Paved Kv= 20.3 fps
2.2
72
Total
Subcatchment 6S: Front Parking Area to Gil
Hydrograph
1.73 cfs
Type1 III 24-h%
1 1 11 bb-�r'Rainfali=12.1 &
Rtnbff Ate&II15,16611 sf
Ruggffl Violpm�75,11421 cf
LL Flow Length=72
tN=19b
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
136

Highlands Postconstruction w smaller Chambers Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 11/22/2019
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Summary for Subcatchment 7S: Septic Area
Runoff = 2.52 cfs @ 12.02 hrs, Volume= 6,816 cf, Depth= 4.26"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 100-yr Rainfall=12.10"
Area (sf) CN DescriDtion
2,401 60 Avg. of Woods/Grass & Newly graded, HSG A
16,794 43 Woods/grass comb., Fair, HSG A
19,195 45 Weighted Average
19,195 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.9 230 0.0730 4.05 Shallow Concentrated Flow,
Grassed Waterwav Kv= 15.0 fos
0.9 230 Total, Increased to minimum Tc = 1.2 min
MO
Subcatchment 7S: Septic Area
Hydrograph
2.52 cfs
1 1 1 1 1 1 'T��eI II+ 24!hr
1 bb-�r IRai%fali=li11&
RluhdfflAlrea#1'9,1951 sf
RuggfflVollume=16,8161 cf
I Pep�hj. 1 uFlow Len th
9=2 01'
�I
Slope' =
�I� 0.0730 '%'
� � T'c�1 L21 mirk
CN=145
Time (hours)
❑ Runoff
137

Highlands Postconstruction w smaller Chambers Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 99
Summary for Subcatchment 8S: NW Wetland Area
Runoff = 3.36 cfs @ 12.05 hrs, Volume= 9,331 cf, Depth= 6.80"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 100-yr Rainfall=12.10"
Area (sf) CN DescriDtion
331 60 Avg. of Woods/Grass & Newly Graded, HSG A
2,664 83 Avg. of Woods/Grass & Newly Graded, HSG C
8,086 43 Woods/grass comb., Fair, HSG A
5,379 76 Woods/grass comb., Fair, HSG C
16,460 61 Weighted Average
16,460 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
3.0 226 0.0070 1.25 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 8S: NW Wetland Area
Hydrograph
3.36 cfs
3I
2
3
0
LL
1 It
ITYpeI II+ 24!hir
1 b�-�►r IR�i%fal�=�12�.1I0�'
RluhdfflAlrOa�116,I460I sf
Ruggffl Vollugnp79,13�1 I cf
Ruln?" i Pep�h7 . 0'I
Flow Len th=2 6,
�lb�eL�.a�o�d'�'
1 I fiT631.0fini i r�
I CN=161
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
138

Highlands Postconstruction w smaller Chambers Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 11/22/2019
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Summary for Subcatchment 9S: Cherrywood Dr/Driveway
Runoff = 5.33 cfs @ 12.03 hrs, Volume= 15,016 cf, Depth= 9.81"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 100-yr Rainfall=12.10"
Area (sf) CN DescriDtion
2,293
60
Avg. of Woods/Grass & Newly Graded, HSG A
4,911
83
Avg. of Woods/Grass & Newly Graded, HSG C
4,885
98
6,273
76
Woods/grass comb., Fair, HSG C
18,362
82
Weighted Average
13,477
73.40% Pervious Area
4,885
26.60% Impervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
2.0 256 0.0200 2.12 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 9S: Cherrywood Dr/Driveway
Hydrograph
i I I Runoff
5.33 cfs
Type 1114�hi•
5 I 1 d0�yi Rainfall=l1 i11&
�I —I 1 RgnpffArea$�3¢21-sf
4 �R off V I me- 5,016 c
Mn Q I �� I l
w Runoff -Depth=9.8V
" 3'I
Flow Length=256'
LL
L- L- I -t LL L -t I I L_ I L- I -1 $Iop=0.0200 't'
2 " I I I I I T0�=�•8 Min
fi I T I-t I fi l rt�-18�
o
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
139

Highlands Postconstruction w smaller Chambers Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 11/22/2019
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Summary for Subcatchment 10S: Cashiers Rd. R.O.W.
Runoff = 3.18 cfs @ 12.03 hrs, Volume= 8,626 cf, Depth= 7.99"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Type III 24-hr 100-yr Rainfall=12.10"
Area (sf) CN DescriDtion
5,907 60 Avg. of Woods/Grass & Newly Graded, HSG A
4,208 98
2,833 43 Woods/grass comb., Fair, HSG A
12,948 69 Weighted Average
8,740 67.50% Pervious Area
4,208 32.50% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
2.1 383 0.0430 3.11 Shallow Concentrated Flow,
Grassed Waterway Kv= 15.0 fps
Subcatchment 10S: Cashiers Rd. R.O.W.
Hydrograph
III Ills �� III
3.1 s cfs
3 I I I I 1 1 1 1 11 b�-�►r IR�i%fal�=�12�.110�'
Runoff l AlrOa�-- 112,19481 sf
N 2 , -4 +RupgTVo1iump=8,g61zf
3 Runoff Depth=7. 91
LL Flow Length=3 3'
�1b�eL0.041d '/'
1 1 1 1 +-t 1 1 T6k21A n{ i 6
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
■ Runoff
140

Highlands Postconstruction w smaller Chambers Type 111 24-hr 100-yr Rainfall=12.10"
Prepared by Broadway Management, LLC Printed 11/22/2019
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Summary for Pond 150XLHD: Cultec detention system
Inflow Area =
30,572 sf,
96.28% Impervious,
Inflow Depth = 11.67" for 100-yr event
Inflow =
9.73 cfs @
12.02 hrs, Volume=
29,740 cf
Outflow =
6.90 cfs @
12.08 hrs, Volume=
29,739 cf, Atten= 29%, Lag= 3.4 min
Primary =
6.90 cfs @
12.08 hrs, Volume=
29,739 cf
Routing by Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Peak Elev= 4,023.78' @ 12.08 hrs Surf.Area= 3,621 sf Storage= 5,390 cf
Plug -Flow detention time= 27.5 min calculated for 29,729 cf (100% of inflow)
Center -of -Mass det. time= 27.6 min ( 764.8 - 737.3 )
Volume
Invert
Avail.Storage
Storage Description
#1A
4,021.25'
687 cf
40.50'W x 23.25'L x 2.54'H Field A
2,393 cf Overall - 675 cf Embedded = 1,718 cf x 40.0% Voids
#2A
4,021.75'
675 cf
Cultec R-150XLHD x 24 Inside #1
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 12 rows
#313
4,021.25'
1,476 cf
24.25'W x 84.75'L x 2.54'H Field B
5,224 cf Overall - 1,534 cf Embedded = 3,689 cf x 40.0% Voids
#413
4,021.75'
1,534 cf
Cultec R-150XLHD x 56 Inside #3
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 7 rows
#5C
4,021.25'
307 cf
17.75'W x 23.25'L x 2.54'H Field C
1,049 cf Overall - 281 cf Embedded = 767 cf x 40.0% Voids
#6C
4,021.75'
281 cf
Cultec R-150XLHD x 10 Inside #5
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 5 rows
#7
4,021.65'
8 cf
12.0" Round 10 LF 12" HDPE
L= 10.0' S= 0.0083 T
#8
4,021.80'
56 cf
4.00'D x 4.49'H J131
#9
4,021.90'
76 cf
18.0" Round 43 LF 18" HDPE
L= 43.0' S= 0.0100 T
#10
4,022.37'
48 cf
4.00'D x 3.83'H G11
#11
4,022.47'
138 cf
18.0" Round 78 LF 18" HDPE
L= 78.0' S= 0.0100 '/'
#12
4,023.29'
36 cf
4.00'D x 2.83'H G11
#13
4,021.80'
44 cf
4.00'D x 3.49'H G14
#14
4,021.90'
102 cf
18.0" Round 58 LF 18" HDPE
L= 58.0' S= 0.0100 T
#15
4,022.51'
40 cf
4.00'D x 3.18'H G13
#16
4,021.94'
40 cf
4.00'D x 3.20'H J132
#17
4,022.04'
40 cf
15.0" Round 33 LF 15" HDPE
L= 33.0' S= 0.0100 T
#18
4,022.41'
37 cf
4.00'D x 2.96'H G15
5,627 cf
Total Available Storage
Storage Group A created with Chamber Wizard
`«i

Highlands Postconstruction w smaller Chambers Type 111 24-hr 100-yr Rainfall=12.10"
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD® 10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 103
Storage Group B created with Chamber Wizard
Storage Group C created with Chamber Wizard
Device
Routing
Invert
Outlet Devices
#1
Primary
4,021.15'
18.0" Round Culvert L= 4.0' Ke= 0.500
Inlet / Outlet Invert= 4,021.15' / 4,021.10' S= 0.0125 '/' Cc= 0.900
n= 0.012, Flow Area= 1.77 sf
#2
Device 1
4,021.25'
6.0" W x 6.0" H Vert. Orifice C= 0.600
#3
Device 1
4,022.75'
1.5' long Weir 2 End Contraction(s) 1.0' Crest Height
#4
Device 1
4,023.75'
5.0' long Top of Wall 2 End Contraction(s)
Primary OutFlow Max=6.88 cfs @ 12.08 hrs HW=4,023.78' (Free Discharge)
L =Culvert (Passes 6.88 cfs of 11.66 cfs potential flow)
2=Orifice (Orifice Controls 1.82 cfs @ 7.27 fps)
3=Weir (Weir Controls 4.98 cfs @ 3.74 fps)
4=Top of Wall (Weir Controls 0.08 cfs @ 0.56 fps)
`IN

Highlands Postconstruction w smaller Chambers Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 104
Pond 150XLHD: Cultec detention system - Chamber Wizard Field A
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 12 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
2 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 21.25' Row Length +12.0" End Stone x 2 =
23.25' Base Length
12 Rows x 33.0" Wide + 6.0" Spacing x 11 + 12.0" Side Stone x 2 = 40.50' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
24 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 12 Rows = 675.5 cf Chamber Storage
2,393.3 cf Field - 675.5 cf Chambers = 1,717.8 cf Stone x 40.0% Voids = 687.1 cf Stone Storage
Chamber Storage + Stone Storage = 1,362.6 cf = 0.031 of
Overall Storage Efficiency = 56.9%
Overall System Size = 23.25' x 40.50' x 2.54'
24 Chambers
88.6 cy Field
63.6 cy Stone
143

Highlands Postconstruction w smaller Chambers Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 11/22/2019
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Pond 150XLHD: Cultec detention system - Chamber Wizard Field B
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 7 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
8 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 82.75' Row Length +12.0" End Stone x 2 =
84.75' Base Length
7 Rows x 33.0" Wide + 6.0" Spacing x 6 + 12.0" Side Stone x 2 = 24.25' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
56 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 7 Rows = 1,534.4 cf Chamber Storage
5,223.6 cf Field - 1,534.4 cf Chambers = 3,689.2 cf Stone x 40.0% Voids = 1,475.7 cf Stone Storage
Chamber Storage + Stone Storage = 3,010.1 cf = 0.069 of
Overall Storage Efficiency = 57.6%
Overall System Size = 84.75' x 24.25' x 2.54'
56 Chambers
193.5 cy Field
136.6 cy Stone
144

Highlands Postconstruction w smaller Chambers Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 11/22/2019
HydroCAD®10.00-24 s/n 05474 ©2018 HydroCAD Software Solutions LLC Page 106
Pond 150XLHD: Cultec detention system - Chamber Wizard Field C
Chamber Model = Cultec R-150XLHD (Cultec Recharger®150XLHD)
Effective Size= 29.8"W x 18.0"H => 2.65 sf x 10.251 = 27.2 cf
Overall Size= 33.0"W x 18.5"H x 11.001 with 0.75' Overlap
Row Length Adjustment= +0.75' x 2.65 sf x 5 rows
33.0" Wide + 6.0" Spacing = 39.0" C-C Row Spacing
2 Chambers/Row x 10.25' Long +0.75' Row Adjustment = 21.25' Row Length +12.0" End Stone x 2 =
23.25' Base Length
5 Rows x 33.0" Wide + 6.0" Spacing x 4 + 12.0" Side Stone x 2 = 17.75' Base Width
6.0" Base + 18.5" Chamber Height + 6.0" Cover = 2.54' Field Height
10 Chambers x 27.2 cf +0.75' Row Adjustment x 2.65 sf x 5 Rows = 281.5 cf Chamber Storage
1,048.9 cf Field - 281.5 cf Chambers = 767.5 cf Stone x 40.0% Voids = 307.0 cf Stone Storage
Chamber Storage + Stone Storage = 588.4 cf = 0.014 of
Overall Storage Efficiency = 56.1 %
Overall System Size = 23.25' x 17.75' x 2.54'
10 Chambers
38.8 cy Field
28.4 cy Stone
145

Highlands Postconstruction w smaller Chambers Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 11/22/2019
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Pond 150XLHD: Cultec detention system
Hydrograph
10
I I I
IIIIIIIII
I I I
I I
19.73 cfs I
IIIIIIII�IIIII
I I I I
I+� 1"Area=30, 7�-sf-
9
L
L I L
I L
I I
8
L 14
1
L
I—Sto'rag e=5,-196-cf--
6.90 cfs
7
ILILI�I�
LEI
LILL
�6
LLLL
F LLI
LLL
0 5
LL
4
IIIIIIIII
IIII
IIIIIIIIIII
3
II II
2
-1 LIL IL IL L
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 '
Time (hours)
19 20 21 22 23 24 25 26 27 28 29 30
0 Inflow
❑ Primary
146

Highlands Postconstruction w smaller Chambers Type 11124-hr 100-yr Rainfall= 12. 10 "
Prepared by Broadway Management, LLC Printed 11/22/2019
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Summary for Link POST: Postconstruction Site Discharge
Inflow Area = 168,784 sf, 27.62% Impervious, Inflow Depth = 6.60" for 100-yr event
Inflow = 28.32 cfs @ 12.04 hrs, Volume= 92,876 cf
Primary = 28.32 cfs @ 12.04 hrs, Volume= 92,876 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.01 hrs
Link POST: Postconstruction Site Discharge
Hydrograph
30
28.32 CfS T
1
IA
El Primary
28�5�
26
1-+
1-4
1- T
1I
T 1 T
T
IT
24
1 T
I-L
I T
22
20
I T I
T I T
FT
w 18
16
L
L
L
IUL-14�
T 1
12
10
6
T
T
T I
t I T
T
T
4
1
i
i i
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
147

APPENDIX C
NRCS SOIL REPORT
148

Hydrologic Soil Group —Macon County, North Carolina
N
M
O] W
301610 301640 301670 301700 301730 301760 301790 301820 301850 301880 301910
35° 5 17" N !- 35° 5 17" N
a W-I r - I '' C
a
• Y
.Oje%
lob
35° 5' 10" N 35° 510" N
301610 301640 301670 301700 301730 301760 301790 301820 301850 301880 301910
3 3
o Map Scale: 1:1,480 Y printed on A landscape (11" x 8.5") sheet.
0
Meters
N 0 20 40 80 120
Feet
0 50 100 200 300
Map projection: Web Mercator Comer coordinates: WGS84 Edge bcs: UTM Zone 17N WGS84
G}DA Natural Resources Web Sbgl Survey 2/28/2019
Conservation Service National Cooperative Soil Survey Page 1 of 4

Hydrologic Soil Group —Macon County, North Carolina
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
1:12,000.
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
rJ 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: Macon County, North Carolina
Survey Area Data: Version 15, Sep 11, 2018
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Feb 6, 2016—Oct 26,
2017
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.
UU� Natural Resources Web St9C6urvey 2/28/2019
� Conservation Service National Cooperative Soil Survey Page 2 of 4

Hydrologic Soil Group —Macon County, North Carolina
Hydrologic Soil Group
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
CuD
Cullasaja-Tuckasegee
complex, 15 to 30
percent slopes, stony
A
2.3
58.3%
EdC
Edneyville-Chestnut
complex, 8 to 15
percent slopes, stony
A
0.0
0.2%
Ud
Udorthents, loamy
C
1.6
41.5%
Totals for Area of Interest
3.9
100.0%
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.
usDA Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
2/28/2019
Page 3 of 4
151

Hydrologic Soil Group —Macon County, North Carolina
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff.- None Specified
Tie -break Rule: Higher
uSDA Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
2/28/2019
Page 4 of 4
152