20191431 Ver 1_BEAM ROAD WET POND HYDROGRAPHS_20191017

01S 2S
Pre SITE DA Post SI E DA
47P
CLT Wetpond 5P
EXIST 84 IN CMP
Subcat Reach on Link Routing Diagram for SEEFRIED - USING CITY POND
Prepared by Burton Engineering , Printed 10/16/2019
HydroCAD® 10.00-17 s/n 03513 © 2016 HydroCAD Software Solutions LLC

SEEFRIED - USING CITY POND Charlotte 6-hr 2-yr 2 Yr. 6 Hr. Rainfall=2.28"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 1S: Pre SITE DA
Runoff = 53.60 cfs @ 3.57 hrs, Volume= 4.587 af, Depth= 0.57"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 2 Yr. 6 Hr. Rainfall=2.28"
Area (ac) CN Description
48.700
55.0
Woods, Good, HSG B
45.000
98.0
Paved parking, HSG B
2.300
98.0
Water Surface, 0% imp, HSG B
96.000
76.2
Weighted Average
51.000
53.13% Pervious Area
45.000
46.88% Impervious Area
Tc
Length
Slope
Velocity
Capacity
Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
18.1
150
0.0100
0.14
Sheet Flow,
Grass: Short n= 0.150 P2= 3.12"
3.0
415
0.0200
2.28
Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
3.5
1,160
0.0050
5.52
17.33
Pipe Channel, RCP Round 24"
24.00" Round Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.012 Concrete pipe, finished
5.3
450
0.0800
1.41
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
2.4
740
0.0070
5.22
260.80
Channel Flow, CHANNEL FLOW
Area= 50.0 sf Perim= 23.0' r= 2.17'
n= 0.040 Winding stream, pools & shoals
32.3 2,915 Total

SEEFRIED - USING CITY POND Charlotte 6-hr 2-yr 2 Yr. 6 Hr. Rainfall=2.28"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 3
Subcatchment 1S: Pre SITE DA
Hydrograph
60 ■Runoff
--+-------+--+--+--+--+--+----+--+--+--+--+--+-------+--+--+--+--+--
55 3.
l-----i-- - - - -I --i --i - - - -IL I -I Vi`h4r1Qt#ji-0-hT -
50-----------il-- -----------------il-- -------------'
45 1 1
--t
- -t- -- --2 Yr-S-Hr-� Rai tfalll�2.28"--
40
35- --t--t-- --t-- -- -- - Rof =9 �00 aq-
f�tr t fira
---1--J--1--+--L----------J--1-- �
R rfa## l u me=,4. 58 i7- a# -
3 30 I I I I
-- -- - -- -- -- ----RUn6ff Depth-Ta 57"--
a 25 20---------�,-- -- �,I --,I --,I --,---,---,-- -- -- ,--F1pw-`F
Yngt l'' �,-910'--
-----t--t--t--t-- t--t--t--t--t--t- -- +
1- T=2.,3 rnt�
5
-------- -- -- ----------'-- -- -- -- -- --' ----------1N=76a-
10 I I I 1
---------- -- --------------- -- -- -------------i-- -- -- -- --
5
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr 2-yr 2 Yr. 6 Hr. Rainfall=2.28"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 2S: Post SITE DA
Runoff = 258.51 cfs @ 3.22 hrs, Volume= 11.543 af, Depth= 1.44"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 2-yr 2 Yr. 6 Hr. Rainfall=2.28"
Area (ac) CN Description
45.000 98.0 Paved parking, HSG B
34.000 98.0 Paved parking, HSG B
14.700 55.0 Woods, Good, HSG B
2.300 98.0 Water Surface, 0% imp, HSG B
96.000 91.4 Weighted Average
17.000 17.71 % Pervious Area
79.000 82.29% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
10.0 Direct Entry, USER INPUT
Subcatchment 2S: Post SITE DA
Hydrograph
280 Runoff
258.51 cfs----7--7--r--r--7----7--7--7--r--I -------7--r--r--7__I---I--7--T--
z6o - - - - - - - - - - - - - - - - - - - - - 4 r ptt,''e-0-tiK -
240
220
-r T-- 7--7--r- 2-Yr1-67Hf-RailnfaH:T2:2W'
200
-------------------------
180 RLjn6ff'Aeea'=96.000 a'c
160 _Runoff V61ume=11.543 of - +-
O p } A
3 140---,---,--,--,---,-----------,--,-----------nIIlrDF'�16h-=14'k��-
a 120E p
J--1--1----J--L--1--L--1--- L--L--L T1,.=10-,a1ji
100
r--i--r--r--+--r--r--i--r--r--t--r--r--i---i--r--+--r--r--��9�
80
60
---'-- L -- L -- L -- L --L --'-- L-- -- L -- L--------'-- -- L -- L--------'-- 1 -- L --
40
r--i--r--r--r--r--r--i--r--r--r--r--r--i---i--r--r--r--r--i---i--r--+--
20
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr 2-yr 2 Yr. 6 Hr. Rainfall=2.28"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 5
Summary for Pond 5P: EXIST 84 IN CMP
[57] Hint: Peaked at 621.44' (Flood elevation advised)
Inflow Area = 96.000 ac, 82.29% Impervious, Inflow Depth = 1.44" for 2 Yr. 6 Hr. event
Inflow = 52.53 cfs @ 3.61 hrs, Volume= 11.541 of
Outflow = 52.53 cfs @ 3.61 hrs, Volume= 11.541 af, Atten= 0%, Lag= 0.0 min
Primary = 52.53 cfs @ 3.61 hrs, Volume= 11.541 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 621.44' @ 3.61 hrs
Device Routing Invert Outlet Devices
#1 Primary 618.57' 84.00" Round CMP—Round 84"
L= 150.0' CMP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 618.57' / 617.82' S= 0.0050'/' Cc= 0.900
n= 0.024, Flow Area= 38.48 sf
Primary OutFlow Max=52.50 cfs @ 3.61 hrs HW=621.43' (Free Discharge)
L1=CMP_Round 84" (Barrel Controls 52.50 cfs @ 5.24 fps)
Pond 5P: EXIST 84 IN CMP
Hyd rog raph
--I-- -- -- -----I-- -- -----I-- -- -- --I-- -- -- -----I-- -- -- --I-- ■ Inflow
52.53 1 ❑ Primary
55 52.53cfs
---- ---------II- Inflow rOe-g6:0bGla`-
50 � II ---II-- �I--II,--II---II-- �I--II, --II,--II---II-- II, --II, --II- Re�kll� Ele�'r=C21.441�
45 -- ----r---I-- --r--r --I----r--r--I--T--r-------7--r--I--
84�.U0'I'
40
--r--r--r-------r--r--r----r--r--r----r--r----r-------r--r--r--
I--
35 -- ----r----------r----------r--r-------+RQ_I_I__ 4IVert_
y I I I I I I I I I I I I I I I I I I
V � =-0'fy�
�w
30-J--1--L--1---I--1--L--1---1--J--1--L--1--J--1--L--1---I-
°----II------II-------I---------II----II�h1115E.{�'-
a 25 I I I I I I I I I I I I I I I I I
20 --'I-'--'------------------------------------f�.�05f'1`-
15
10 i--r--r--r--I--r--r--r--I--r--r--r--r-r--r--r--I---I--r--r--r--I--
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr 2-yr 2 Yr. 6 Hr. Rainfall=2.28"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 6
Elevation Primary
(feet)
(cfs)
618.57
0.00
618.61
0.01
618.65
0.03
618.69
0.06
618.73
0.12
618.77
0.19
618.81
0.29
618.85
0.40
618.89
0.54
618.93
0.69
618.97
0.87
619.01
1.07
619.05
1.29
619.09
1.53
619.13
1.79
619.17
2.08
619.21
2.39
619.25
2.72
619.29
3.07
619.33
3.45
619.37
3.84
619.41
4.26
619.45
4.70
619.49
5.17
619.53
5.65
619.57
6.16
619.61
6.69
619.65
7.25
619.69
7.82
619.73
8.42
619.77
9.03
619.81
9.67
619.85
10.34
619.89
11.02
619.93
11.72
619.97
12.45
620.01
13.20
620.05
13.96
620.09
14.75
620.13
15.56
620.17
16.39
620.21
17.24
620.25
18.11
620.29
19.00
620.33
19.92
620.37
20.85
620.41
21.80
620.45
22.77
620.49
23.76
620.53
24.77
620.57
25.80
620.61
26.85
Stage -Discharge for Pond 5P: EXIST 84 IN CMP
Elevation Primary
(feet)
(cfs)
620.65
27.92
620.69
29.00
620.73
30.11
620.77
31.23
620.81
32.37
620.85
33.54
620.89
34.71
620.93
35.91
620.97
37.13
621.01
38.36
621.05
39.61
621.09
40.87
621.13
42.16
621.17
43.46
621.21
44.78
621.25
46.12
621.29
47.47
621.33
48.84
621.37
50.22
621.41
51.62
621.45
53.04
621.49
54.47
621.53
55.92
621.57
57.38
621.61
58.86
621.65
60.36
621.69
61.87
621.73
63.39
621.77
64.93
621.81
66.49
621.85
68.06
621.89
69.64
621.93
71.24
621.97
72.85
622.01
74.47
622.05
76.11
622.09
77.76
622.13
79.43
622.17
81.11
622.21
82.80
622.25
84.50
622.29
86.22
622.33
87.95
622.37
89.69
622.41
91.44
622.45
93.21
622.49
94.99
622.53
96.78
622.57
98.58
622.61
100.39
622.65
102.21
622.69
104.05
Elevation
Primary
(feet)
(cfs)
622.73
105.89
622.77
107.75
622.81
109.61
622.85
111.49
622.89
113.38
622.93
115.27
622.97
117.18
623.01
119.09
623.05
121.02
623.09
122.95
623.13
124.89
623.17
126.84
623.21
128.80
623.25
130.77
623.29
132.75
623.33
134.73
623.37
136.73
623.41
138.73
623.45
140.73
623.49
142.75
623.53
144.77
623.57
146.80
623.61
148.83
623.65
150.87
623.69
152.92
623.73
154.98
623.77
157.03
623.81
159.10
623.85
161.17
623.89
163.25
623.93
165.33
623.97
167.41
624.01
169.50
624.05
171.59
624.09
173.69
624.13
175.79
624.17
177.90
624.21
180.01
624.25
182.12
624.29
184.23
624.33
186.35
624.37
188.47
624.41
190.59
624.45
192.72
624.49
194.84
624.53
196.97
624.57
199.10
624.61
201.22
624.65
203.35
624.69
205.48
624.73
207.61
624.77
209.74
Elevation Primary
(feet)
(cfs)
624.81
211.87
624.85
214.00
624.89
216.13
624.93
218.25
624.97
220.37
625.01
222.50
625.05
224.62
625.09
226.73
625.13
228.85
625.17
230.96
625.21
233.07
625.25
235.17
625.29
237.27
625.33
239.36
625.37
241.46
625.41
243.54
625.45
245.62
625.49
247.69
625.53
249.76
625.57
251.82

SEEFRIED - USING CITY POND Charlotte 6-hr 2-yr 2 Yr. 6 Hr. Rainfall=2.28"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 7
Summary for Pond 47P: CLT Wetpond
Inflow Area = 96.000 ac, 82.29% Impervious, Inflow Depth = 1.44" for 2 Yr. 6 Hr. event
Inflow = 258.51 cfs @ 3.22 hrs, Volume= 11.543 of
Outflow = 52.53 cfs @ 3.61 hrs, Volume= 11.541 af, Atten= 80%, Lag= 23.8 min
Primary = 52.53 cfs @ 3.61 hrs, Volume= 11.541 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 639.73' @ 3.61 hrs Surf.Area= 124,286 sf Storage= 279,279 cf
Plug -Flow detention time= 118.7 min calculated for 11.541 of (100% of inflow)
Center -of -Mass det. time= 118.4 min ( 332.9 - 214.5 )
Volume Invert Avail.Storage Storage Description
#1 637.00' 991,606 cf Custom Stage Data (Prismatic)-isted below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
637.00 86,751 0 0
638.00 97,974 92,363 92,363
638.50 100,000 49,494 141,856
644.00 209,000 849,750 991,606
Device Routing Invert Outlet Devices
#1 Primary 637.00' 4.00' long x 2.80' rise Sharp -Crested Rectangular Weir
2 End Contraction(s) 10.00' Crest Height
#2 Primary 639.80' 8.00' long Sharp -Crested Rectangular Weir End Contraction(s)
11.00' Crest Height
#3 Primary 641.70' 10.00' long Sharp -Crested Rectangular Weir2 End Contraction(s)
12.00' Crest Height
#4 Secondary 642.20' 40.00' long x 15.00' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63
Primary OutFlow Max=52.50 cfs @ 3.61 hrs HW=639.72' TW=621.43' (Dynamic Tailwater)
1=Sharp-Crested Rectangular Weir(Weir Controls 52.50 cfs @ 5.58 fps)
2=Sharp-Crested Rectangular Weir( Controls 0.00 cfs)
3=Sharp-Crested Rectangular Weir( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=637.00' TW=618.57' (Dynamic Tailwater)
L4= Broad -crested Rectangular Weir( Controls 0.00 cfs)

SEEFRIED - USING CITY POND Charlotte 6-hr 2-yr 2 Yr. 6 Hr. Rainfall=2.28"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 8
Pond 47P: CLT Wetpond
Hyd rog raph
-r--r-r--r-r--r-r--r-r--r--i--r-r--r--i--r--i--r--i--r--i--r--i--
258.51 cfs --
—
--
— --
— --
— -- ----
— ----�--�pn_n
low
Inf ow Ae-ea=9 a-c -
Lw
ary280ondary
.000
y--Ir-y--Ir-y--r-y--r-y--Ir--li--r-y--r
r
- Peak-E1eV;639.73►-
260
240
-------
- --
----
- -- ----
----'S ora je_=-279 79 cf -
220
--I'+-
--I'+-
--IL-
--IL-
--+--I'--I
---+--'-- --'-- --'------+--'--
180
3 140
LL 120
' 52.53 cfs__________________�__�__�__�_�__�__�__�_�__�__�__
80
52.53 cfs
60
40
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr 2-yr 2 Yr. 6 Hr. Rainfall=2.28"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 9
Stage -Discharge for Pond 47P: CLT Wetpond
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
637.00
0.00
0.00
0.00
637.10
0.41
0.41
0.00
637.20
1.16
1.16
0.00
637.30
2.12
2.12
0.00
637.40
3.26
3.26
0.00
637.50
4.54
4.54
0.00
637.60
5.94
5.94
0.00
637.70
7.46
7.46
0.00
637.80
9.07
9.07
0.00
637.90
10.78
10.78
0.00
638.00
12.58
12.58
0.00
638.10
14.45
14.45
0.00
638.20
16.40
16.40
0.00
638.30
18.42
18.42
0.00
638.40
20.50
20.50
0.00
638.50
22.64
22.64
0.00
638.60
24.83
24.83
0.00
638.70
27.08
27.08
0.00
638.80
29.38
29.38
0.00
638.90
31.72
31.72
0.00
639.00
34.11
34.11
0.00
639.10
36.54
36.54
0.00
639.20
39.01
39.01
0.00
639.30
41.51
41.51
0.00
639.40
44.05
44.05
0.00
639.50
46.62
46.62
0.00
639.60
49.22
49.22
0.00
639.70
51.85
51.85
0.00
639.80
54.51
54.51
0.00
639.90
57.98
57.98
0.00
640.00
61.89
61.89
0.00
640.10
66.09
66.09
0.00
640.20
70.54
70.54
0.00
640.30
75.20
75.20
0.00
640.40
80.07
80.07
0.00
640.50
85.11
85.11
0.00
640.60
90.32
90.32
0.00
640.70
95.69
95.69
0.00
640.80
101.22
101.22
0.00
640.90
106.88
106.88
0.00
641.00
112.68
112.68
0.00
641.10
118.62
118.62
0.00
641.20
124.68
124.68
0.00
641.30
130.85
130.85
0.00
641.40
137.15
137.15
0.00
641.50
143.56
143.56
0.00
641.60
150.07
150.07
0.00
641.70
156.69
156.69
0.00
641.80
164.45
164.45
0.00
641.90
173.15
173.15
0.00
642.00
182.51
182.51
0.00
642.10
192.40
192.40
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
642.20
202.76
202.76
0.00
642.30
216.94
213.55
3.39
642.40
234.32
224.73
9.59
642.50
253.96
236.28
17.68
642.60
275.49
248.17
27.32
642.70
298.57
260.39
38.18
642.80
323.11
272.92
50.19
642.90
348.29
285.74
62.55
643.00
374.41
298.84
75.56
643.10
402.21
312.22
89.99
643.20
431.06
325.86
105.20
643.30
461.35
339.75
121.60
643.40
492.69
353.88
138.81
643.50
524.77
368.25
156.52
643.60
557.77
382.84
174.93
643.70
591.29
397.66
193.63
643.80
625.60
412.69
212.91
643.90
661.10
427.92
233.18
644.00
697.41
443.36
254.05

SEEFRIED - USING CITY POND Charlotte 6-hr 10-yr 10 Yr. 6 Hr. Rainfall=3.72"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 10
Summary for Subcatchment 1S: Pre SITE DA
Runoff = 150.47 cfs @ 3.54 hrs, Volume= 12.326 af, Depth= 1.54"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 10-yr 10 Yr. 6 Hr. Rainfall=3.72"
Area (ac) CN Description
48.700
55.0
Woods, Good, HSG B
45.000
98.0
Paved parking, HSG B
2.300
98.0
Water Surface, 0% imp, HSG B
96.000
76.2
Weighted Average
51.000
53.13% Pervious Area
45.000
46.88% Impervious Area
Tc
Length
Slope
Velocity
Capacity
Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
18.1
150
0.0100
0.14
Sheet Flow,
Grass: Short n= 0.150 P2= 3.12"
3.0
415
0.0200
2.28
Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
3.5
1,160
0.0050
5.52
17.33
Pipe Channel, RCP Round 24"
24.00" Round Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.012 Concrete pipe, finished
5.3
450
0.0800
1.41
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
2.4
740
0.0070
5.22
260.80
Channel Flow, CHANNEL FLOW
Area= 50.0 sf Perim= 23.0' r= 2.17'
n= 0.040 Winding stream, pools & shoals
32.3 2,915 Total

SEEFRIED - USING CITY POND Charlotte 6-hr 10-yr 10 Yr. 6 Hr. Rainfall=3.72"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 11
Subcatchment 1S: Pre SITE DA
Hydrograph
160
cs
150------'- --' --'--------'- - --'--------' arlottq 6,-hr-1 r-
140
--------+----- +-- *0-Yr, 61H1. RainfaH=-3.72"--
130
r-
---r--r--r--r--r----r--r--r--r--I------I--r--r--r--I------I--r--+
--
120 ---'-- -- -- -- --' --'-- -- -- ------- Runoff aArea=9'6,000-ac-
110 _-RUndff Vblu M6=9 2.-32-6 -6f -
100
N-----,----r--r--r-- r--,--r--r-- Runoff D --WiO 54"-
90 ----- -- -- -- -- ---- -- --+------------ -- ----ryJ------('�--+--
0 80-------- -- -------------- ----------0 ��s'T:Jt �7Y-' -
a 70
---r-r--r--r--r--r--i--r--r--r--r--r--r--i--r--r--r i-
60
5o CN=76.2
40
30
-I- - + - - + - - + - - + - - + - -I- - + - - + - - + - - + - -I--
20
10
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr 10-yr 10 Yr. 6 Hr. Rainfall=3.72"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 12
Summary for Subcatchment 2S: Post SITE DA
Runoff = 445.04 cfs @ 3.21 hrs, Volume= 22.311 af, Depth= 2.79"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 10-yr 10 Yr. 6 Hr. Rainfall=3.72"
Area (ac) CN Description
45.000 98.0 Paved parking, HSG B
34.000 98.0 Paved parking, HSG B
14.700 55.0 Woods, Good, HSG B
2.300 98.0 Water Surface, 0% imp, HSG B
96.000 91.4 Weighted Average
17.000 17.71 % Pervious Area
79.000 82.29% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
10.0 Direct Entry, USER INPUT
Subcatchment 2S: Post SITE DA
Hydrograph
� �
480 --�--�--r--r--r--r--I--�--r--r--r--r--�
-J--1--1--L--L--1--J--1--1--1---1--------J--1--L----------1--1--
� �
�
�
�
� �
�
�
�
�
� � � � � � � � � � �
--�---�--r--r--r--I--�- �--r--T--
■Runoff
46 445.04ots 1---1--J--J--J--L--L--'--J--J--J--L--'---'---'-�-+�--i�,,,,-�-r-##-----yy-,-1--1--1--
4407---li--y--rt--+--r--Ir--li--y-----+--r--Ir--li---I
l�Oadottgfill{�_1�yr-
420 -'----J---'
400 ' ------
--+--+--
--'
--'
--'
--
--------'---'
----+--
--+--+-*08-r,-6;Hr.-kainfaHs3;72;"-
--'
-
- -'-- -
380----�----
360 ;------�--
--------;
--;
--;
--
-----;--
----�--
--
--
-------------
--;
--'�,
------------------- ---
--Runoff Area��=9�'6.000-a-t-
340-------r--r--I--I-------r--r--r--I--
320---1--J--1--1--L--L----J--
--1--L--RUndff-Vbluh*--Z2.-311-;0-
I - --I - -r-- r - - I - - I -- I - --I - - r- -r --
300
wU 280, ---
260-----+--+--+--+--+----+--+--+--+----------+--+--+---
-- r-
- r-
'--
- r
---
---
r
-----
r-
---
- r-
---
'
r-
'---
-r-
-----
-�-- I---�-r-r-r-- I---�-r - -T --
u�-1--J--
I -RfDath=27wt-
--
0 240--1--'I---'I
a 220_____+__+__+__+__+____+__+__+__+----------+--+__+�__I_
-
- 'I -
- 'I --'1
--'�---'�---'�---11
--'
--'
--'---'---'--' --' T -�� V---I---
-T _fn -
200---I---�I--
-I --
�I---�I---�I---�I---�I--
�I--
�I--�I---�I---�I---�I--
�I-- �I---�I---�I---�`
180---1--J--1--1--L--L--1--J--1--1--L--1--------J--1--L-----N'M-_
160
-
-,--
I -- I
-- -I
-- �__
�--
140 ---1--J--J--J--J--L--'--J--J--J--L--'--------J--J--J----------J--J--
120 r--i--r--r--r--r--r--i--r--r--r--r--r--i---i--r--r--r--r--i---i--r--r--
100 ---'---'---'--'---'---'---'---'---'---'--'---'----------------------------'---
60--------?--------------�----
40-----+--+--+--+--+----+--+--+--+----------+--+--+----------+--+--
-----------------------------?--
--
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr 10-yr 10 Yr. 6 Hr. Rainfall=3.72"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 13
Summary for Pond 5P: EXIST 84 IN CMP
[57] Hint: Peaked at 623.29' (Flood elevation advised)
Inflow Area = 96.000 ac, 82.29% Impervious, Inflow Depth = 2.79" for 10 Yr. 6 Hr. event
Inflow = 132.60 cfs @ 3.52 hrs, Volume= 22.309 of
Outflow = 132.60 cfs @ 3.52 hrs, Volume= 22.309 af, Atten= 0%, Lag= 0.0 min
Primary = 132.60 cfs @ 3.52 hrs, Volume= 22.309 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 623.29' @ 3.52 hrs
Device Routing Invert Outlet Devices
#1 Primary 618.57' 84.00" Round CMP—Round 84"
L= 150.0' CMP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 618.57' / 617.82' S= 0.0050'/' Cc= 0.900
n= 0.024, Flow Area= 38.48 sf
Primary OutFlow Max=132.39 cfs @ 3.52 hrs HW=623.28' (Free Discharge)
L1=CMP_Round 84" (Barrel Controls 132.39 cfs @ 6.79 fps)
Pond 5P: EXIST 84 IN CMP
Hyd rog raph
----y--+--Ir--li----r--Ir--li--rt--r--+-y--+--r--li--y--+--Ir--li-----r--li ■ Inflow
132.60 cfs + + _ _ El Primary
140 132.60cfs - I --li -- i --li --i-- 1n f 1pw ATe -9, 6,.OPO+aq-
130 --'---' --Peak-Gfcpp'' ^^v;V��++ ��}}
2aT
-----------'---'--------'---'------.i2W-
120 1
110
--+--+--+-+--+--+--+-+--+--+--+-+--+--+---����-kr����1�i-
N y 1
80
70---i-- --i------i --i------i-----i-- --i-----i-- --i _p��fY.Y1�l/�_
0 ------------i --il----------+-------------1-i1� IIT/--lT+/--fii��-
LL - -- 60 -- -- - -- -- - -- -- - -- -----L-'1�Q�0--
---+--�- 4 - - ------- --I---- --+--
50
40
30
20
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr 10-yr 10 Yr. 6 Hr. Rainfall=3.72"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 14
Elevation Primary
(feet)
(cfs)
618.57
0.00
618.61
0.01
618.65
0.03
618.69
0.06
618.73
0.12
618.77
0.19
618.81
0.29
618.85
0.40
618.89
0.54
618.93
0.69
618.97
0.87
619.01
1.07
619.05
1.29
619.09
1.53
619.13
1.79
619.17
2.08
619.21
2.39
619.25
2.72
619.29
3.07
619.33
3.45
619.37
3.84
619.41
4.26
619.45
4.70
619.49
5.17
619.53
5.65
619.57
6.16
619.61
6.69
619.65
7.25
619.69
7.82
619.73
8.42
619.77
9.03
619.81
9.67
619.85
10.34
619.89
11.02
619.93
11.72
619.97
12.45
620.01
13.20
620.05
13.96
620.09
14.75
620.13
15.56
620.17
16.39
620.21
17.24
620.25
18.11
620.29
19.00
620.33
19.92
620.37
20.85
620.41
21.80
620.45
22.77
620.49
23.76
620.53
24.77
620.57
25.80
620.61
26.85
Stage -Discharge for Pond 5P: EXIST 84 IN CMP
Elevation Primary
(feet)
(cfs)
620.65
27.92
620.69
29.00
620.73
30.11
620.77
31.23
620.81
32.37
620.85
33.54
620.89
34.71
620.93
35.91
620.97
37.13
621.01
38.36
621.05
39.61
621.09
40.87
621.13
42.16
621.17
43.46
621.21
44.78
621.25
46.12
621.29
47.47
621.33
48.84
621.37
50.22
621.41
51.62
621.45
53.04
621.49
54.47
621.53
55.92
621.57
57.38
621.61
58.86
621.65
60.36
621.69
61.87
621.73
63.39
621.77
64.93
621.81
66.49
621.85
68.06
621.89
69.64
621.93
71.24
621.97
72.85
622.01
74.47
622.05
76.11
622.09
77.76
622.13
79.43
622.17
81.11
622.21
82.80
622.25
84.50
622.29
86.22
622.33
87.95
622.37
89.69
622.41
91.44
622.45
93.21
622.49
94.99
622.53
96.78
622.57
98.58
622.61
100.39
622.65
102.21
622.69
104.05
Elevation
Primary
(feet)
(cfs)
622.73
105.89
622.77
107.75
622.81
109.61
622.85
111.49
622.89
113.38
622.93
115.27
622.97
117.18
623.01
119.09
623.05
121.02
623.09
122.95
623.13
124.89
623.17
126.84
623.21
128.80
623.25
130.77
623.29
132.75
623.33
134.73
623.37
136.73
623.41
138.73
623.45
140.73
623.49
142.75
623.53
144.77
623.57
146.80
623.61
148.83
623.65
150.87
623.69
152.92
623.73
154.98
623.77
157.03
623.81
159.10
623.85
161.17
623.89
163.25
623.93
165.33
623.97
167.41
624.01
169.50
624.05
171.59
624.09
173.69
624.13
175.79
624.17
177.90
624.21
180.01
624.25
182.12
624.29
184.23
624.33
186.35
624.37
188.47
624.41
190.59
624.45
192.72
624.49
194.84
624.53
196.97
624.57
199.10
624.61
201.22
624.65
203.35
624.69
205.48
624.73
207.61
624.77
209.74
Elevation Primary
(feet)
(cfs)
624.81
211.87
624.85
214.00
624.89
216.13
624.93
218.25
624.97
220.37
625.01
222.50
625.05
224.62
625.09
226.73
625.13
228.85
625.17
230.96
625.21
233.07
625.25
235.17
625.29
237.27
625.33
239.36
625.37
241.46
625.41
243.54
625.45
245.62
625.49
247.69
625.53
249.76
625.57
251.82

SEEFRIED - USING CITY POND Charlotte 6-hr 10-yr 10 Yr. 6 Hr. Rainfall=3.72"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 15
Summary for Pond 47P: CLT Wetpond
Inflow Area = 96.000 ac, 82.29% Impervious, Inflow Depth = 2.79" for 10 Yr. 6 Hr. event
Inflow = 445.04 cfs @ 3.21 hrs, Volume= 22.311 of
Outflow = 132.60 cfs @ 3.52 hrs, Volume= 22.309 af, Atten= 70%, Lag= 18.3 min
Primary = 132.60 cfs @ 3.52 hrs, Volume= 22.309 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 641.33' @ 3.52 hrs Surf.Area= 156,044 sf Storage= 503,890 cf
Plug -Flow detention time= 92.0 min calculated for 22.299 of (100% of inflow)
Center -of -Mass det. time= 93.6 min ( 303.1 - 209.5 )
Volume Invert Avail.Storage Storage Description
#1 637.00' 991,606 cf Custom Stage Data (Prismatic)-isted below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
637.00 86,751 0 0
638.00 97,974 92,363 92,363
638.50 100,000 49,494 141,856
644.00 209,000 849,750 991,606
Device Routing Invert Outlet Devices
#1 Primary 637.00' 4.00' long x 2.80' rise Sharp -Crested Rectangular Weir
2 End Contraction(s) 10.00' Crest Height
#2 Primary 639.80' 8.00' long Sharp -Crested Rectangular Weir End Contraction(s)
11.00' Crest Height
#3 Primary 641.70' 10.00' long Sharp -Crested Rectangular Weir2 End Contraction(s)
12.00' Crest Height
#4 Secondary 642.20' 40.00' long x 15.00' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63
Primary OutFlow Max=132.39 cfs @ 3.52 hrs HW=641.32' TW=623.28' (Dynamic Tailwater)
1=Sharp-Crested Rectangular Weir(Orifice Controls 84.22 cfs @ 8.74 fps)
2=Sharp-Crested Rectangular Weir(Weir Controls 48.17 cfs @ 4.11 fps)
3=Sharp-Crested Rectangular Weir( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=637.00' TW=618.57' (Dynamic Tailwater)
L4= Broad -crested Rectangular Weir( Controls 0.00 cfs)

SEEFRIED - USING CITY POND Charlotte 6-hr 10-yr 10 Yr. 6 Hr. Rainfall=3.72"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 16
Pond 47P: CLT Wetpond
Hyd rog raph
W Inflow
445.04 cfs
WOutflow
'
❑ PrimaryInfowArea-96.00Uac
—
Secondary
Peak EleV'641.133'
450
r--r-r--r-r--r-r--r-r--r--I--r-r--r--I--r--I--r--I--r--I--r--I--
'
Stora e1=503,890 d
400
350
�--I�-�--I�-�--r-�--r-�--I�--li--r-�--r--li--r--li--r--li--r--li--r--li--
300
N
-- - -- - -- - -- - -- --I--
- -- --I-- --I-- --I-- --I-- --I--
V
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 I I I I I I
I I I I I I I I I I I I
250
o
_
� I I I I I I I I I I I
I I I I I I I I I I I I
LL 200
' �132.60 cfs
132.60 cfs I I I I I I I I I I I
I I I I I I I I I I I I
150
__I--- --- --- --- ---------------------------------I--
100
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr 10-yr 10 Yr. 6 Hr. Rainfall=3.72"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 17
Stage -Discharge for Pond 47P: CLT Wetpond
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
637.00
0.00
0.00
0.00
637.10
0.41
0.41
0.00
637.20
1.16
1.16
0.00
637.30
2.12
2.12
0.00
637.40
3.26
3.26
0.00
637.50
4.54
4.54
0.00
637.60
5.94
5.94
0.00
637.70
7.46
7.46
0.00
637.80
9.07
9.07
0.00
637.90
10.78
10.78
0.00
638.00
12.58
12.58
0.00
638.10
14.45
14.45
0.00
638.20
16.40
16.40
0.00
638.30
18.42
18.42
0.00
638.40
20.50
20.50
0.00
638.50
22.64
22.64
0.00
638.60
24.83
24.83
0.00
638.70
27.08
27.08
0.00
638.80
29.38
29.38
0.00
638.90
31.72
31.72
0.00
639.00
34.11
34.11
0.00
639.10
36.54
36.54
0.00
639.20
39.01
39.01
0.00
639.30
41.51
41.51
0.00
639.40
44.05
44.05
0.00
639.50
46.62
46.62
0.00
639.60
49.22
49.22
0.00
639.70
51.85
51.85
0.00
639.80
54.51
54.51
0.00
639.90
57.98
57.98
0.00
640.00
61.89
61.89
0.00
640.10
66.09
66.09
0.00
640.20
70.54
70.54
0.00
640.30
75.20
75.20
0.00
640.40
80.07
80.07
0.00
640.50
85.11
85.11
0.00
640.60
90.32
90.32
0.00
640.70
95.69
95.69
0.00
640.80
101.22
101.22
0.00
640.90
106.88
106.88
0.00
641.00
112.68
112.68
0.00
641.10
118.62
118.62
0.00
641.20
124.68
124.68
0.00
641.30
130.85
130.85
0.00
641.40
137.15
137.15
0.00
641.50
143.56
143.56
0.00
641.60
150.07
150.07
0.00
641.70
156.69
156.69
0.00
641.80
164.45
164.45
0.00
641.90
173.15
173.15
0.00
642.00
182.51
182.51
0.00
642.10
192.40
192.40
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
642.20
202.76
202.76
0.00
642.30
216.94
213.55
3.39
642.40
234.32
224.73
9.59
642.50
253.96
236.28
17.68
642.60
275.49
248.17
27.32
642.70
298.57
260.39
38.18
642.80
323.11
272.92
50.19
642.90
348.29
285.74
62.55
643.00
374.41
298.84
75.56
643.10
402.21
312.22
89.99
643.20
431.06
325.86
105.20
643.30
461.35
339.75
121.60
643.40
492.69
353.88
138.81
643.50
524.77
368.25
156.52
643.60
557.77
382.84
174.93
643.70
591.29
397.66
193.63
643.80
625.60
412.69
212.91
643.90
661.10
427.92
233.18
644.00
697.41
443.36
254.05

SEEFRIED - USING CITY POND Charlotte 6-hr25-yr 25 Yr. 6 Hr. Rainfall=4.34"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 18
Summary for Subcatchment 1S: Pre SITE DA
Runoff = 196.81 cfs @ 3.53 hrs, Volume= 16.148 af, Depth= 2.02"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 25-yr 25 Yr. 6 Hr. Rainfall=4.34"
Area (ac) CN Description
48.700
55.0
Woods, Good, HSG B
45.000
98.0
Paved parking, HSG B
2.300
98.0
Water Surface, 0% imp, HSG B
96.000
76.2
Weighted Average
51.000
53.13% Pervious Area
45.000
46.88% Impervious Area
Tc
Length
Slope
Velocity
Capacity
Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
18.1
150
0.0100
0.14
Sheet Flow,
Grass: Short n= 0.150 P2= 3.12"
3.0
415
0.0200
2.28
Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
3.5
1,160
0.0050
5.52
17.33
Pipe Channel, RCP Round 24"
24.00" Round Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.012 Concrete pipe, finished
5.3
450
0.0800
1.41
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
2.4
740
0.0070
5.22
260.80
Channel Flow, CHANNEL FLOW
Area= 50.0 sf Perim= 23.0' r= 2.17'
n= 0.040 Winding stream, pools & shoals
32.3 2,915 Total

SEEFRIED - USING CITY POND Charlotte 6-hr25-yr 25 Yr. 6 Hr. Rainfall=4.34"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 19
Subcatchment 1S: Pre SITE DA
Hydrograph
---------------------- --------
220 ---------- --r
210-----L-- ----L--------�------L--------�---- ■Runoff
96.81 cfs
200 --- -- -- -- -- -- -- -- -- -- C �� Qr- i�]C-2�
180
190'r------rt--r--r--Ir--------7--r--Ir--I--�-
'--------',------------------ -- -5-fir;-6 ��,r�.-tai��#11-=4.-�3��-
170------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 I I
160 ----- -- -- -- -- ---- -- --+-- -----Runoff AteaI1=96.000-a'G-
150 r----r--r--r--r——r—---r——r--r--r--r--I---I--r——r--r--I---I—--I--r--r--
140 ----- -- - -T--
I ---- ----T--r--RUn6ffT1/ 1uh=1$.148-6f-
130 — — — — — — — — — — — — — — — — — — — — — — —I II — — —I — — I— — — I— — —I— — —I — — —I — — I— — — — I— — — — —I II — — II _ _
120---------------- Runoff Depth=MZ" -
110 ---I----+--+--r--r--I-- ----+--r--------I-- -+--r--------I--
100 --I-- -- T--T--r--r --I-- ----T--r- -
LL90 f� *�
80 _ -- -- - TI -*31 2 `7 of -
� I
I____J__1__1__L__L__I__J__L__1__L__I___I___I__L__1__L T_
70 CN=76.2
60 r----r--7--r--r--r----r--r--r--r-----r---r--r--r--r--I---I r--r--
50 ----- --?-- I_--Ii --�i------- -- --Ii --�i------- -- I_--Ii --�i-- - - - -- I --
40 -----L----L--L------L----L--L-----------L--L------------L--
I I I I I I I I I I I I I I I I I I I I I I
30
20 --r--r--r--r----r--r--r--r--r-------r--r--r--r-------r--r--
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr25-yr 25 Yr. 6 Hr. Rainfall=4.34"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 20
Summary for Subcatchment 2S: Post SITE DA
Runoff = 526.69 cfs @ 3.21 hrs, Volume= 27.078 af, Depth= 3.38"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 25-yr 25 Yr. 6 Hr. Rainfall=4.34"
Area (ac) CN Description
45.000 98.0 Paved parking, HSG B
34.000 98.0 Paved parking, HSG B
14.700 55.0 Woods, Good, HSG B
2.300 98.0 Water Surface, 0% imp, HSG B
96.000 91.4 Weighted Average
17.000 17.71 % Pervious Area
79.000 82.29% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
10.0 Direct Entry, USER INPUT
Subcatchment 2S: Post SITE DA
Hydrograph
--'---'---'-- I'--'---'---'---'---'-- I'-- I'--'---'---'---'-- I'--'---'- '---'---'-- I'--'--- ■Runoff
55 526.69 cfs
-- -- - - - -- -- -- - - ---I C arlott 6�-hr,-2 yrr-
500
450
-1---1--J--1-- ----L----J--1--1--L--1--- Rurr�##tAtea=96:E�00-aG-
400 pp ,y �,,y { n
------i------------------ -------Rl�t bff �V V1uM -Z7V78 A#-
350
w ---I----rt--+--r--'r--I-- ----t--r--------'Runoff, Depth=33W'-
3 300 Tpp ,n ;'m
a 250
200
7 - - 7 - - r - - 7 - - T - - r 7 - - r - - 7 7 - - T - -
1501
100
50
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr25-yr 25 Yr. 6 Hr. Rainfall=4.34"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 21
Summary for Pond 5P: EXIST 84 IN CMP
[57] Hint: Peaked at 624.05' (Flood elevation advised)
Inflow Area = 96.000 ac, 82.29% Impervious, Inflow Depth = 3.38" for 25 Yr. 6 Hr. event
Inflow = 171.43 cfs @ 3.49 hrs, Volume= 27.076 of
Outflow = 171.43 cfs @ 3.49 hrs, Volume= 27.076 af, Atten= 0%, Lag= 0.0 min
Primary = 171.43 cfs @ 3.49 hrs, Volume= 27.076 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 624.05' @ 3.49 hrs
Device Routing Invert Outlet Devices
#1 Primary 618.57' 84.00" Round CMP—Round 84"
L= 150.0' CMP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 618.57' / 617.82' S= 0.0050'/' Cc= 0.900
n= 0.024, Flow Area= 38.48 sf
Primary OutFlow Max=171.25 cfs @ 3.49 hrs HW=624.04' (Free Discharge)
L1=CMP_Round 84" (Barrel Controls 171.25 cfs @ 7.30 fps)
Pond 5P: EXIST 84 IN CMP
Hyd rog raph
'
190
--1----+----1----r--1---1----L--1--J--+--r--1----+----1----+--1--
171.43 cfs__+__+__+__1--+--+--1---1--+--+--1--+--+--+--11--+__+--1--
■ Inflow
■ Prima ry
180 171.43
cfs 1--+--+--r--1
--+--r--r--+--r--r+nrowIAf-e-96.�AA
IOnn , -
170
160
1--+--+--r--1--+--r--r--1--+--r--r
F-1EaR- E1 ev; 624. 0 5! -
-+--+--
150
140
=-r--r--r--1--r--r--r--1--r--r--1--r--r--r--1--r--r--r--1-���1
-r--T--r----r--r-------r--r----r--r--r----r--r--r--1Q
- 4F1--
130
120
--
1
--r--
1
1
--1--
1 1
--r--
1
1
--1----r--1--r--r--
1 1 1
1 1
- -1-RoUnrd-GUIVeit-
1 1 1 1
-
w 110
V 100
1--r--r--r--1--r--r
1
1
-; --;
1
1 1 r--r--r-r--r--r--1--r--r--r--1--r--r--i
--1-- --;
1
--1---1--
1
e�w
--;--1---1-- - Z4-
1
0 90
—
LL
1 -----------------------------------------------
---1--
1
1
--i
1 1
--1--
1
--i
1
--i
1 1 1
--1-- --i
1 1
--1---1--
__1___1 - - _1--
1 1 1 1 1 1 1 1� 1 �
--i--1---1--1 --1 L1=150.0-
80
-
70
---1---1--
1-----1---1--
1-----1---1--1-----1--
1--�=�,1vt�Jk� ��
60
-J--1--L--1--J--L--1---1--J--L--1--J--1--L--1--J--1--L--1--J--L--1--
50
-J--1--L--1--J--L--1---1--J--L--1--J--1--L--1--J--1--L--1--J--L--1--
40
-J--
--
--1--
--L--1---1--
--L--1--
----L--1--J-- -- --1----r--1--
30------1----L--1---1----L--1--J----L--1--J------1----r--1--
20
10
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr25-yr 25 Yr. 6 Hr. Rainfall=4.34"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 22
Elevation Primary
(feet)
(cfs)
618.57
0.00
618.61
0.01
618.65
0.03
618.69
0.06
618.73
0.12
618.77
0.19
618.81
0.29
618.85
0.40
618.89
0.54
618.93
0.69
618.97
0.87
619.01
1.07
619.05
1.29
619.09
1.53
619.13
1.79
619.17
2.08
619.21
2.39
619.25
2.72
619.29
3.07
619.33
3.45
619.37
3.84
619.41
4.26
619.45
4.70
619.49
5.17
619.53
5.65
619.57
6.16
619.61
6.69
619.65
7.25
619.69
7.82
619.73
8.42
619.77
9.03
619.81
9.67
619.85
10.34
619.89
11.02
619.93
11.72
619.97
12.45
620.01
13.20
620.05
13.96
620.09
14.75
620.13
15.56
620.17
16.39
620.21
17.24
620.25
18.11
620.29
19.00
620.33
19.92
620.37
20.85
620.41
21.80
620.45
22.77
620.49
23.76
620.53
24.77
620.57
25.80
620.61
26.85
Stage -Discharge for Pond 5P: EXIST 84 IN CMP
Elevation Primary
(feet)
(cfs)
620.65
27.92
620.69
29.00
620.73
30.11
620.77
31.23
620.81
32.37
620.85
33.54
620.89
34.71
620.93
35.91
620.97
37.13
621.01
38.36
621.05
39.61
621.09
40.87
621.13
42.16
621.17
43.46
621.21
44.78
621.25
46.12
621.29
47.47
621.33
48.84
621.37
50.22
621.41
51.62
621.45
53.04
621.49
54.47
621.53
55.92
621.57
57.38
621.61
58.86
621.65
60.36
621.69
61.87
621.73
63.39
621.77
64.93
621.81
66.49
621.85
68.06
621.89
69.64
621.93
71.24
621.97
72.85
622.01
74.47
622.05
76.11
622.09
77.76
622.13
79.43
622.17
81.11
622.21
82.80
622.25
84.50
622.29
86.22
622.33
87.95
622.37
89.69
622.41
91.44
622.45
93.21
622.49
94.99
622.53
96.78
622.57
98.58
622.61
100.39
622.65
102.21
622.69
104.05
Elevation
Primary
(feet)
(cfs)
622.73
105.89
622.77
107.75
622.81
109.61
622.85
111.49
622.89
113.38
622.93
115.27
622.97
117.18
623.01
119.09
623.05
121.02
623.09
122.95
623.13
124.89
623.17
126.84
623.21
128.80
623.25
130.77
623.29
132.75
623.33
134.73
623.37
136.73
623.41
138.73
623.45
140.73
623.49
142.75
623.53
144.77
623.57
146.80
623.61
148.83
623.65
150.87
623.69
152.92
623.73
154.98
623.77
157.03
623.81
159.10
623.85
161.17
623.89
163.25
623.93
165.33
623.97
167.41
624.01
169.50
624.05
171.59
624.09
173.69
624.13
175.79
624.17
177.90
624.21
180.01
624.25
182.12
624.29
184.23
624.33
186.35
624.37
188.47
624.41
190.59
624.45
192.72
624.49
194.84
624.53
196.97
624.57
199.10
624.61
201.22
624.65
203.35
624.69
205.48
624.73
207.61
624.77
209.74
Elevation Primary
(feet)
(cfs)
624.81
211.87
624.85
214.00
624.89
216.13
624.93
218.25
624.97
220.37
625.01
222.50
625.05
224.62
625.09
226.73
625.13
228.85
625.17
230.96
625.21
233.07
625.25
235.17
625.29
237.27
625.33
239.36
625.37
241.46
625.41
243.54
625.45
245.62
625.49
247.69
625.53
249.76
625.57
251.82

SEEFRIED - USING CITY POND Charlotte 6-hr25-yr 25 Yr. 6 Hr. Rainfall=4.34"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 23
Summary for Pond 47P: CLT Wetpond
Inflow Area = 96.000 ac, 82.29% Impervious, Inflow Depth = 3.38" for 25 Yr. 6 Hr. event
Inflow = 526.69 cfs @ 3.21 hrs, Volume= 27.078 of
Outflow = 171.43 cfs @ 3.49 hrs, Volume= 27.076 af, Atten= 67%, Lag= 16.9 min
Primary = 171.43 cfs @ 3.49 hrs, Volume= 27.076 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 641.88' @ 3.49 hrs Surf.Area= 167,002 sf Storage= 593,197 cf
Plug -Flow detention time= 85.7 min calculated for 27.065 of (100% of inflow)
Center -of -Mass det. time= 87.2 min (295.7 - 208.5 )
Volume Invert Avail.Storage Storage Description
#1 637.00' 991,606 cf Custom Stage Data (Prismatic)-isted below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
637.00 86,751 0 0
638.00 97,974 92,363 92,363
638.50 100,000 49,494 141,856
644.00 209,000 849,750 991,606
Device Routing Invert Outlet Devices
#1 Primary 637.00' 4.00' long x 2.80' rise Sharp -Crested Rectangular Weir
2 End Contraction(s) 10.00' Crest Height
#2 Primary 639.80' 8.00' long Sharp -Crested Rectangular Weir End Contraction(s)
11.00' Crest Height
#3 Primary 641.70' 10.00' long Sharp -Crested Rectangular Weir2 End Contraction(s)
12.00' Crest Height
#4 Secondary 642.20' 40.00' long x 15.00' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63
Primary OutFlow Max=171.25 cfs @ 3.49 hrs HW=641.88' TW=624.04' (Dynamic Tailwater)
1=Sharp-Crested Rectangular Weir(Orifice Controls 92.73 cfs @ 9.63 fps)
2=Sharp-Crested Rectangular Weir(Weir Controls 76.05 cfs @ 4.82 fps)
3=Sharp-Crested Rectangular Weir(Weir Controls 2.47 cfs @ 1.39 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=637.00' TW=618.57' (Dynamic Tailwater)
L4= Broad -crested Rectangular Weir( Controls 0.00 cfs)

SEEFRIED - USING CITY POND Charlotte 6-hr25-yr 25 Yr. 6 Hr. Rainfall=4.34"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 24
Pond 47P: CLT Wetpond
Hyd rog raph
-+--+-+--+-+--+-+--+-+--+--1--+-+--+--1--+--1--+--1--+--1--+--1--
■ Inflow
526.69 cfs
1
r Outflow
+--+-+--+-+--r-+--+-+--+--1--r-
'6E'.�0+C�.
1/�111
1nfV0�%-/�a�V
❑Primary
Secondary
550
�--1r-7--1r-�--r-7--r-�--1r--1i--r-7--r-
r -
1Peak-EleV�4T.88r
500
--------------------------1-----II--III-Storage'=593.11197
d
450
--1--; --1--; --1--; --1--; --1--;
--1--; --1--; --1--; --1--; --1--; --1--
400
---
--1-- --1-- --1-- --1-- --1--
--1--I ----I ----I ----I ----I ----
350
N
--11--
300
0
E 250
171.43 cfs
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1
171.43 cfs
200
150
--
-+--r---r-+--r- --+--1--r-+--+--1--r--1--+--1--+--1--+--1--
100
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr25-yr 25 Yr. 6 Hr. Rainfall=4.34"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 25
Stage -Discharge for Pond 47P: CLT Wetpond
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
637.00
0.00
0.00
0.00
637.10
0.41
0.41
0.00
637.20
1.16
1.16
0.00
637.30
2.12
2.12
0.00
637.40
3.26
3.26
0.00
637.50
4.54
4.54
0.00
637.60
5.94
5.94
0.00
637.70
7.46
7.46
0.00
637.80
9.07
9.07
0.00
637.90
10.78
10.78
0.00
638.00
12.58
12.58
0.00
638.10
14.45
14.45
0.00
638.20
16.40
16.40
0.00
638.30
18.42
18.42
0.00
638.40
20.50
20.50
0.00
638.50
22.64
22.64
0.00
638.60
24.83
24.83
0.00
638.70
27.08
27.08
0.00
638.80
29.38
29.38
0.00
638.90
31.72
31.72
0.00
639.00
34.11
34.11
0.00
639.10
36.54
36.54
0.00
639.20
39.01
39.01
0.00
639.30
41.51
41.51
0.00
639.40
44.05
44.05
0.00
639.50
46.62
46.62
0.00
639.60
49.22
49.22
0.00
639.70
51.85
51.85
0.00
639.80
54.51
54.51
0.00
639.90
57.98
57.98
0.00
640.00
61.89
61.89
0.00
640.10
66.09
66.09
0.00
640.20
70.54
70.54
0.00
640.30
75.20
75.20
0.00
640.40
80.07
80.07
0.00
640.50
85.11
85.11
0.00
640.60
90.32
90.32
0.00
640.70
95.69
95.69
0.00
640.80
101.22
101.22
0.00
640.90
106.88
106.88
0.00
641.00
112.68
112.68
0.00
641.10
118.62
118.62
0.00
641.20
124.68
124.68
0.00
641.30
130.85
130.85
0.00
641.40
137.15
137.15
0.00
641.50
143.56
143.56
0.00
641.60
150.07
150.07
0.00
641.70
156.69
156.69
0.00
641.80
164.45
164.45
0.00
641.90
173.15
173.15
0.00
642.00
182.51
182.51
0.00
642.10
192.40
192.40
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
642.20
202.76
202.76
0.00
642.30
216.94
213.55
3.39
642.40
234.32
224.73
9.59
642.50
253.96
236.28
17.68
642.60
275.49
248.17
27.32
642.70
298.57
260.39
38.18
642.80
323.11
272.92
50.19
642.90
348.29
285.74
62.55
643.00
374.41
298.84
75.56
643.10
402.21
312.22
89.99
643.20
431.06
325.86
105.20
643.30
461.35
339.75
121.60
643.40
492.69
353.88
138.81
643.50
524.77
368.25
156.52
643.60
557.77
382.84
174.93
643.70
591.29
397.66
193.63
643.80
625.60
412.69
212.91
643.90
661.10
427.92
233.18
644.00
697.41
443.36
254.05

SEEFRIED - USING CITY POND Charlotte 6-hr50-yr 50 Yr. 6Hr. Rainfall=4.88"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 26
Summary for Subcatchment 1S: Pre SITE DA
Runoff = 237.20 cfs @ 3.48 hrs, Volume= 19.633 af, Depth= 2.45"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 50-yr 50 Yr. 6 Hr. Rainfall=4.88"
Area (ac) CN Description
48.700
55.0
Woods, Good, HSG B
45.000
98.0
Paved parking, HSG B
2.300
98.0
Water Surface, 0% imp, HSG B
96.000
76.2
Weighted Average
51.000
53.13% Pervious Area
45.000
46.88% Impervious Area
Tc
Length
Slope
Velocity
Capacity
Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
18.1
150
0.0100
0.14
Sheet Flow,
Grass: Short n= 0.150 P2= 3.12"
3.0
415
0.0200
2.28
Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
3.5
1,160
0.0050
5.52
17.33
Pipe Channel, RCP Round 24"
24.00" Round Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.012 Concrete pipe, finished
5.3
450
0.0800
1.41
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
2.4
740
0.0070
5.22
260.80
Channel Flow, CHANNEL FLOW
Area= 50.0 sf Perim= 23.0' r= 2.17'
n= 0.040 Winding stream, pools & shoals
32.3 2,915 Total

SEEFRIED - USING CITY POND Charlotte 6-hr50-yr 50 Yr. 6Hr. Rainfall=4.88"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 27
Subcatchment 1S: Pre SITE DA
Hydrograph
260 ■Runoff
---�---- -- --�--------�-- -- ----------�------------�-- -- --
237.20 cfs i i i i i i i i i i i i i i i i i i
240------'- --' --'--------'-- '- --'---------C-1jar1ottq- Ihr-5 0 r-
220---1--J--1--i-- ------J--1--i--L- j
200
-----J--1--1--L--L--1--J--1--1--L--1--- Runoff tAltea=- 6.000-ac-
180
---1--J--1-- -- -- --'--J--1--1--L--Runoff -Vbluin6=1-9:633-etf-
1 60 I I I I I I I I 1
w -- -- - - ---- -- -- - - Munoff Depth-=2 4W'-
140
3 il--il--�--�--r--�--�--i--�--�--+--r--i---i---iF�ow 4er19t�=�'2,�T�`-
° 120
LL
100 Tic=32;3 m i n
r--r-r--r--r--r--r--i--r--r--r--r--r--r-r--r--r--r--r--r--i--r--r--
8o CN=76.2
-- r--------I-- r -- r -- r --I_ --I_ --I-- r -- r --
60
r--i--
-- -- -- -- ---- -- --T - ----------- -- ------------ -- --
40
20
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr50-yr 50 Yr. 6Hr. Rainfall=4.88"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 28
Summary for Subcatchment 2S: Post SITE DA
Runoff = 596.07 cfs @ 3.17 hrs, Volume= 31.265 af, Depth= 3.91"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 50-yr 50 Yr. 6 Hr. Rainfall=4.88"
Area (ac) CN Description
45.000 98.0 Paved parking, HSG B
34.000 98.0 Paved parking, HSG B
14.700 55.0 Woods, Good, HSG B
2.300 98.0 Water Surface, 0% imp, HSG B
96.000 91.4 Weighted Average
17.000 17.71 % Pervious Area
79.000 82.29% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
10.0 Direct Entry, USER INPUT
Subcatchment 2S: Post SITE DA
Hydrograph
— — F
7— — T — — 7 7 7 7 — — 7 — — + I , + 7 I 7 — — T —6506.01 cfs77Tr7777r-1 II7r 77T600 IIIIIC�arlottq-fi,-hr-5�-yK-
550
-- -- -- -- -- -- -- A50Y�-61Hr.-kail�#-au=4.8W' -
500 I
-- -- - -- -- -- - Runoff Aiiea-J6:00©-a-t-
450
- +--+- -- -- +--+--RUndff VbluM6--3-F.-26 -Af-
400
w-----J--;--;--;--L----J--;--;----------MunoffDeDth-=3 91"-
.V.. 350 I I I I I
------ -- --+-- -- ---- ---
-+-- +---- - - - -
-- --+-- - +--
�—°° 300 ��-'1�T�I�
— + — — + — — + — — + — — + — —I— — + — — + — — + — — + — —I— — —I— — —
250 `i 1.4
+----+--+--+--+--+----+--+--+--+-------+--+--+--+--+--+-+--+--+--
200
r------7--r--r--r----7-- --7--+-------------+--r--r--r----------
150
r------7--r--r--r----7----7--+-------------r--r--r--r---- --+--
100
50
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr50-yr 50 Yr. 6Hr. Rainfall=4.88"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 29
Summary for Pond 5P: EXIST 84 IN CMP
[57] Hint: Peaked at 624.87' (Flood elevation advised)
Inflow Area = 96.000 ac, 82.29% Impervious, Inflow Depth = 3.91" for 50 Yr. 6 Hr. event
Inflow = 214.94 cfs @ 3.42 hrs, Volume= 31.263 of
Outflow = 214.94 cfs @ 3.42 hrs, Volume= 31.263 af, Atten= 0%, Lag= 0.0 min
Primary = 214.94 cfs @ 3.42 hrs, Volume= 31.263 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 624.87' @ 3.42 hrs
Device Routing Invert Outlet Devices
#1 Primary 618.57' 84.00" Round CMP—Round 84"
L= 150.0' CMP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 618.57' / 617.82' S= 0.0050'/' Cc= 0.900
n= 0.024, Flow Area= 38.48 sf
Primary OutFlow Max=213.89 cfs @ 3.42 hrs HW=624.85' (Free Discharge)
L1=CMP_Round 84" (Barrel Controls 213.89 cfs @ 7.77 fps)
Pond 5P: EXIST 84 IN CMP
Hyd rog raph
--1--r--r--r--1--r--r--r--1--r--r--r-r--r--r--1--r--r--r--1--r--r--r-
240-----11--1�--1�
z1a.94 cfs
-+--+--r--1--+--+--1---1--+--r--1--+--+--+--1--+--+--+--1--+--+--1--
J
-----11--1�
--1�
-----11--1�
--1�
--11II---11--1�-----11--1�--1�--11----1_--1� -
■Inflow
■Prima ry
23 -
22 214.94 cfs --
- -
-
+--
--1--
--+--1---I--4--I--1---1nf
y�
[d YAT-ea=96.-00 i
1
210 ---1--
200
r
--1--i--
r
--1--
--1---1--
--1---1-- r--1--i-- r 1 -
10
Pea Ele —,V24./1
180 1--J--1--L--1--1--L--1---1--1--L--1--J--1--L--1--J--i--L--1-
1
I
I
ii-
8�
170 --
--r--r--1--
--r--1---1--
--r--r-
--7--r--1--1--r--r--I- FF�^--
160 11---1111--1�
150--r--r--r--1--r--r--r--1--r--r--r-r--r--r--1-
--1�
--11---11--1�
--1�
--11---11--1�
--11---1�--
I�--1i I �{���1�-�i��ii�G�
1 -
140
y
I
I
I I
I
I
I I I
I I
I I I I I I I - - - - - - - - - - -
u 130 --
--
--
--1--
--r--1---1--
--r--1--
--+--r--1-- -- ---n=O.-024-
3 120---11--
0 110 --
LL �
--
11---11---11--
--
--1--
1--11---11---11--?--1r--11---11--
--r--1---1--
--r--1--
1--1r--11---11-- 11---11---1-- ;--T 11--
--+--r--1-- -- -- L-450-V1-
I�
100 1--r--r--r--1--r--r
I 1 r--r--1--r--r--r--1--r--r--r--1--r--r'
-1--
90
--
-J--1--L--1--1--L--1---1--1--L--1--J--1--L--1--J--
I
--1- -
- - -
80
r--r--r--1--r--r--
r--r--r-r--r--r--1--r--
r
70
-J--1--L--1--1--L--1---1--1--L--1--J--1--L--1--J--1--L--1--1--L--1--
1
I
I 1
50
--1--
1--1---1--
--
--1---1--
--
--1---1--
----1---1----1---1-- -- --1--
40
---+--+--1--
--+--1---1--
--r--1--+--+--+--1--
--+--+--1----+--1--
30
-1--1--1
--11---11--1--1
--11---11--1--11---11---11--1--11---11--1--1
--11---11--1--1 -
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr50-yr 50 Yr. 6Hr. Rainfall=4.88"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 30
Elevation Primary
(feet)
(cfs)
618.57
0.00
618.61
0.01
618.65
0.03
618.69
0.06
618.73
0.12
618.77
0.19
618.81
0.29
618.85
0.40
618.89
0.54
618.93
0.69
618.97
0.87
619.01
1.07
619.05
1.29
619.09
1.53
619.13
1.79
619.17
2.08
619.21
2.39
619.25
2.72
619.29
3.07
619.33
3.45
619.37
3.84
619.41
4.26
619.45
4.70
619.49
5.17
619.53
5.65
619.57
6.16
619.61
6.69
619.65
7.25
619.69
7.82
619.73
8.42
619.77
9.03
619.81
9.67
619.85
10.34
619.89
11.02
619.93
11.72
619.97
12.45
620.01
13.20
620.05
13.96
620.09
14.75
620.13
15.56
620.17
16.39
620.21
17.24
620.25
18.11
620.29
19.00
620.33
19.92
620.37
20.85
620.41
21.80
620.45
22.77
620.49
23.76
620.53
24.77
620.57
25.80
620.61
26.85
Stage -Discharge for Pond 5P: EXIST 84 IN CMP
Elevation Primary
(feet)
(cfs)
620.65
27.92
620.69
29.00
620.73
30.11
620.77
31.23
620.81
32.37
620.85
33.54
620.89
34.71
620.93
35.91
620.97
37.13
621.01
38.36
621.05
39.61
621.09
40.87
621.13
42.16
621.17
43.46
621.21
44.78
621.25
46.12
621.29
47.47
621.33
48.84
621.37
50.22
621.41
51.62
621.45
53.04
621.49
54.47
621.53
55.92
621.57
57.38
621.61
58.86
621.65
60.36
621.69
61.87
621.73
63.39
621.77
64.93
621.81
66.49
621.85
68.06
621.89
69.64
621.93
71.24
621.97
72.85
622.01
74.47
622.05
76.11
622.09
77.76
622.13
79.43
622.17
81.11
622.21
82.80
622.25
84.50
622.29
86.22
622.33
87.95
622.37
89.69
622.41
91.44
622.45
93.21
622.49
94.99
622.53
96.78
622.57
98.58
622.61
100.39
622.65
102.21
622.69
104.05
Elevation
Primary
(feet)
(cfs)
622.73
105.89
622.77
107.75
622.81
109.61
622.85
111.49
622.89
113.38
622.93
115.27
622.97
117.18
623.01
119.09
623.05
121.02
623.09
122.95
623.13
124.89
623.17
126.84
623.21
128.80
623.25
130.77
623.29
132.75
623.33
134.73
623.37
136.73
623.41
138.73
623.45
140.73
623.49
142.75
623.53
144.77
623.57
146.80
623.61
148.83
623.65
150.87
623.69
152.92
623.73
154.98
623.77
157.03
623.81
159.10
623.85
161.17
623.89
163.25
623.93
165.33
623.97
167.41
624.01
169.50
624.05
171.59
624.09
173.69
624.13
175.79
624.17
177.90
624.21
180.01
624.25
182.12
624.29
184.23
624.33
186.35
624.37
188.47
624.41
190.59
624.45
192.72
624.49
194.84
624.53
196.97
624.57
199.10
624.61
201.22
624.65
203.35
624.69
205.48
624.73
207.61
624.77
209.74
Elevation Primary
(feet)
(cfs)
624.81
211.87
624.85
214.00
624.89
216.13
624.93
218.25
624.97
220.37
625.01
222.50
625.05
224.62
625.09
226.73
625.13
228.85
625.17
230.96
625.21
233.07
625.25
235.17
625.29
237.27
625.33
239.36
625.37
241.46
625.41
243.54
625.45
245.62
625.49
247.69
625.53
249.76
625.57
251.82

SEEFRIED - USING CITY POND Charlotte 6-hr50-yr 50 Yr. 6Hr. Rainfall=4.88"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 31
Summary for Pond 47P: CLT Wetpond
Inflow Area = 96.000 ac, 82.29% Impervious, Inflow Depth = 3.91" for 50 Yr. 6 Hr. event
Inflow = 596.07 cfs @ 3.17 hrs, Volume= 31.265 of
Outflow = 214.94 cfs @ 3.42 hrs, Volume= 31.263 af, Atten= 64%, Lag= 15.3 min
Primary = 212.21 cfs @ 3.42 hrs, Volume= 31.237 of
Secondary = 2.73 cfs @ 3.42 hrs, Volume= 0.026 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 642.29' @ 3.42 hrs Surf.Area= 175,068 sf Storage= 662,816 cf
Plug -Flow detention time= 82.8 min calculated for 31.263 of (100% of inflow)
Center -of -Mass det. time= 82.3 min (287.6 - 205.3 )
Volume Invert Avail.Storage Storage Description
#1 637.00' 991,606 cf Custom Stage Data (Prismatic)-isted below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
637.00 86,751 0 0
638.00 97,974 92,363 92,363
638.50 100,000 49,494 141,856
644.00 209,000 849,750 991,606
Device Routing Invert Outlet Devices
#1 Primary 637.00' 4.00' long x 2.80' rise Sharp -Crested Rectangular Weir
2 End Contraction(s) 10.00' Crest Height
#2 Primary 639.80' 8.00' long Sharp -Crested Rectangular Weir End Contraction(s)
11.00' Crest Height
#3 Primary 641.70' 10.00' long Sharp -Crested Rectangular Weir2 End Contraction(s)
12.00' Crest Height
#4 Secondary 642.20' 40.00' long x 15.00' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63
Primary OutFlow Max=211.43 cfs @ 3.42 hrs HW=642.28' TW=624.85' (Dynamic Tailwater)
1=Sharp-Crested Rectangular Weir(Orifice Controls 98.53 cfs @ 10.23 fps)
2=Sharp-Crested Rectangular Weir(Weir Controls 98.51 cfs @ 5.29 fps)
3=Sharp-Crested Rectangular Weir(Weir Controls 14.39 cfs @ 2.51 fps)
Secondary OutFlow Max=2.46 cfs @ 3.42 hrs HW=642.28' TW=624.85' (Dynamic Tailwater)
L4= Broad -crested Rectangular Weir(Weir Controls 2.46 cfs @ 0.76 fps)

SEEFRIED - USING CITY POND Charlotte 6-hr50-yr 50 Yr. 6Hr. Rainfall=4.88"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 32
Pond 47P: CLT Wetpond
.....
' I
i
•
i - C
•
�Sto - • • • •
••
%%%%%%%%%%%%%%%%%%%/------ %%/%�%/%�%%%%%%%/�%
......///%

SEEFRIED - USING CITY POND Charlotte 6-hr50-yr 50 Yr. 6Hr. Rainfall=4.88"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 33
Stage -Discharge for Pond 47P: CLT Wetpond
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
637.00
0.00
0.00
0.00
637.10
0.41
0.41
0.00
637.20
1.16
1.16
0.00
637.30
2.12
2.12
0.00
637.40
3.26
3.26
0.00
637.50
4.54
4.54
0.00
637.60
5.94
5.94
0.00
637.70
7.46
7.46
0.00
637.80
9.07
9.07
0.00
637.90
10.78
10.78
0.00
638.00
12.58
12.58
0.00
638.10
14.45
14.45
0.00
638.20
16.40
16.40
0.00
638.30
18.42
18.42
0.00
638.40
20.50
20.50
0.00
638.50
22.64
22.64
0.00
638.60
24.83
24.83
0.00
638.70
27.08
27.08
0.00
638.80
29.38
29.38
0.00
638.90
31.72
31.72
0.00
639.00
34.11
34.11
0.00
639.10
36.54
36.54
0.00
639.20
39.01
39.01
0.00
639.30
41.51
41.51
0.00
639.40
44.05
44.05
0.00
639.50
46.62
46.62
0.00
639.60
49.22
49.22
0.00
639.70
51.85
51.85
0.00
639.80
54.51
54.51
0.00
639.90
57.98
57.98
0.00
640.00
61.89
61.89
0.00
640.10
66.09
66.09
0.00
640.20
70.54
70.54
0.00
640.30
75.20
75.20
0.00
640.40
80.07
80.07
0.00
640.50
85.11
85.11
0.00
640.60
90.32
90.32
0.00
640.70
95.69
95.69
0.00
640.80
101.22
101.22
0.00
640.90
106.88
106.88
0.00
641.00
112.68
112.68
0.00
641.10
118.62
118.62
0.00
641.20
124.68
124.68
0.00
641.30
130.85
130.85
0.00
641.40
137.15
137.15
0.00
641.50
143.56
143.56
0.00
641.60
150.07
150.07
0.00
641.70
156.69
156.69
0.00
641.80
164.45
164.45
0.00
641.90
173.15
173.15
0.00
642.00
182.51
182.51
0.00
642.10
192.40
192.40
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
642.20
202.76
202.76
0.00
642.30
216.94
213.55
3.39
642.40
234.32
224.73
9.59
642.50
253.96
236.28
17.68
642.60
275.49
248.17
27.32
642.70
298.57
260.39
38.18
642.80
323.11
272.92
50.19
642.90
348.29
285.74
62.55
643.00
374.41
298.84
75.56
643.10
402.21
312.22
89.99
643.20
431.06
325.86
105.20
643.30
461.35
339.75
121.60
643.40
492.69
353.88
138.81
643.50
524.77
368.25
156.52
643.60
557.77
382.84
174.93
643.70
591.29
397.66
193.63
643.80
625.60
412.69
212.91
643.90
661.10
427.92
233.18
644.00
697.41
443.36
254.05

SEEFRIED - USING CITY POND Charlotte 6-hr 100-yr 100 Yr. 6 Hr. Rainfall=5.33"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 34
Summary for Subcatchment 1S: Pre SITE DA
Runoff = 276.67 cfs @ 3.48 hrs, Volume= 22.625 af, Depth= 2.83"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 100-yr 100 Yr. 6 Hr. Rainfall=5.33"
Area (ac) CN Description
48.700
55.0
Woods, Good, HSG B
45.000
98.0
Paved parking, HSG B
2.300
98.0
Water Surface, 0% imp, HSG B
96.000
76.2
Weighted Average
51.000
53.13% Pervious Area
45.000
46.88% Impervious Area
Tc
Length
Slope
Velocity
Capacity
Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
18.1
150
0.0100
0.14
Sheet Flow,
Grass: Short n= 0.150 P2= 3.12"
3.0
415
0.0200
2.28
Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
3.5
1,160
0.0050
5.52
17.33
Pipe Channel, RCP Round 24"
24.00" Round Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.012 Concrete pipe, finished
5.3
450
0.0800
1.41
Shallow Concentrated Flow,
Woodland Kv= 5.0 fps
2.4
740
0.0070
5.22
260.80
Channel Flow, CHANNEL FLOW
Area= 50.0 sf Perim= 23.0' r= 2.17'
n= 0.040 Winding stream, pools & shoals
32.3 2,915 Total

SEEFRIED - USING CITY POND Charlotte 6-hr 100-yr 100 Yr. 6 Hr. Rainfall=5.33"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 35
Subcatchment 1S: Pre SITE DA
Hydrograph
--+----+--+--+--+--+----+--+--+--+----------+--+--+--+--+-+--+--+--
300 ■Runoff
-------------------
280 -C;4a rlo ttc;-6 -h it-;1 0'0-j'% r -
260 '
240 ---I----------'I--- --II-- ------10(� ��r= '1r.-0-.-Za�nf;a11=5,3T'-
220-kupoff p=
zoo ----- -- --+-- --' --I-- ----+--}--_Rlun7off -YjaI-umje=-22.&Z5-If-
w 180-------- -- ------------ -- ------------Runoff-Qeplth
160
3----+--+--+--+--+-+--+--+--+--+--+----- --Fiov. Length=�,gRIW-
° 140
LL
120 Tic '321.3 irn r h
100 CN=/ 6.2
80
60
40
20
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr 100-yr 100 Yr. 6 Hr. Rainfall=5.33"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 36
Summary for Subcatchment 2S: Post SITE DA
Runoff = 669.92 cfs @ 3.17 hrs, Volume= 34.772 af, Depth= 4.35"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 100-yr 100 Yr. 6 Hr. Rainfall=5.33"
Area (ac) CN Description
45.000 98.0 Paved parking, HSG B
34.000 98.0 Paved parking, HSG B
14.700 55.0 Woods, Good, HSG B
2.300 98.0 Water Surface, 0% imp, HSG B
96.000 91.4 Weighted Average
17.000 17.71 % Pervious Area
79.000 82.29% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
10.0 Direct Entry, USER INPUT
Subcatchment 2S: Post SITE DA
Hydrograph
-- --1--
750
'--'---'---'---'--'---'---'---'---'---'---'--'---'---'---'---'--'---'---'---'---'---'--'--- ■Runoff
70 s6s.92 cfs
-+----+--+--+--+--+-+--+--+--+--+--+- --+ a�lote', 6=r'1100=yr
650
----'-- --'------'--- --'- --'---'----------------------------
600 � _Ra'nfall=5s33+„
550 Ru-qO#f Area=+f i+
6-00%� �-
-i - -1- - ��
si unloff VQ1-umje=34.1772-a€-
450 {�I1 11 1 1 1 1
^-r--1--r--r--r--r--r--1--r--r--r--r--r--1---1- f��Alil�lil �eptft 4t,35j'
N
V400 1 1 1 1 1 1 1 1 1 1 1 1 1 1
'---'---'i-- it --'i --'i--'---'---'-- it-- it --'i--'---'---'-- it--'i --'i - --' --
o 350 I I C-11 0��-0 m i n
LL I-----__1__1______--____+____----__I__�__1__�__I___I___I__�__+__
300 I C N=91.'4
250 1
200
r--1--r--r--r--r--r--1--r--r--r--r--r--1---1--r--r--r--r--1---1--r--+--
150
100
+----+--+--+--+--+----+--+--+--+-------+--+--+--+--+--+-+--+--+--
50 1 1 I I I 1 1
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr 100-yr 100 Yr. 6 Hr. Rainfall=5.33"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 37
Summary for Pond 5P: EXIST 84 IN CMP
[57] Hint: Peaked at 626.02' (Flood elevation advised)
Inflow Area = 96.000 ac, 82.29% Impervious, Inflow Depth = 4.35" for 100 Yr. 6 Hr. event
Inflow = 274.55 cfs @ 3.39 hrs, Volume= 34.770 of
Outflow = 274.55 cfs @ 3.39 hrs, Volume= 34.770 af, Atten= 0%, Lag= 0.0 min
Primary = 274.55 cfs @ 3.39 hrs, Volume= 34.770 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 626.02' @ 3.39 hrs
Device Routing Invert Outlet Devices
#1 Primary 618.57' 84.00" Round CMP—Round 84"
L= 150.0' CMP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 618.57' / 617.82' S= 0.0050'/' Cc= 0.900
n= 0.024, Flow Area= 38.48 sf
Primary OutFlow Max=273.81 cfs @ 3.39 hrs HW=626.01' (Free Discharge)
L1=CMP_Round 84" (Barrel Controls 273.81 cfs @ 8.33 fps)
Pond 5P: EXIST 84 IN CMP
Hyd rog raph
I I I I I I I I I I I I I I I I I I I I ■ Inflow
cfs 1--1---1----- 1I----- - l --
■ Primary
300 274.55
274.55 c
28 fs T-000aq_� ^�I�
1--+--+--+--1--+--+--1---1--+--r--1--+--+--+--1--+--+--��+��-;y-Imo�++-��+-��++45�-+--I--
260---1--1---1---1----1---1---1----1---1---1----Peal�_Ele1Y_JOZ-
240
I 8
220 ----r--r--I-- --r--i 1I --1----r----r--+--r------r--r--1- - -
1--J--1--L--1--1--L--1---1--1--L--1--J--1--L--1--J--1--L--1--1--L--1--
200 RoUn'1d CUIVei t
180--r--r--r--1--r--r r--r--r-r--+--r--1--r--r--r--1--r--r--I -
y I I I I I I I I I I I I I I I I I I I V (y' (1�n-=O.{024-
160 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 T 1
0 140---11--11---11---11---11--11---11---11-- 1--11---11---11---11--11---11---11--11---1, L1'=1'5©.a'-
LL
1-
120 C h r
100 1---11--11---11---11-- �1--11---11---11--
80 r--r--r--1--r--r----1--r--r--1--7--+--r--1--r--r--r--1--r--r-- -
60
40
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr 100-yr 100 Yr. 6 Hr. Rainfall=5.33"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 38
Elevation Primary
(feet)
(cfs)
618.57
0.00
618.61
0.01
618.65
0.03
618.69
0.06
618.73
0.12
618.77
0.19
618.81
0.29
618.85
0.40
618.89
0.54
618.93
0.69
618.97
0.87
619.01
1.07
619.05
1.29
619.09
1.53
619.13
1.79
619.17
2.08
619.21
2.39
619.25
2.72
619.29
3.07
619.33
3.45
619.37
3.84
619.41
4.26
619.45
4.70
619.49
5.17
619.53
5.65
619.57
6.16
619.61
6.69
619.65
7.25
619.69
7.82
619.73
8.42
619.77
9.03
619.81
9.67
619.85
10.34
619.89
11.02
619.93
11.72
619.97
12.45
620.01
13.20
620.05
13.96
620.09
14.75
620.13
15.56
620.17
16.39
620.21
17.24
620.25
18.11
620.29
19.00
620.33
19.92
620.37
20.85
620.41
21.80
620.45
22.77
620.49
23.76
620.53
24.77
620.57
25.80
620.61
26.85
Stage -Discharge for Pond 5P: EXIST 84 IN CMP
Elevation Primary
(feet)
(cfs)
620.65
27.92
620.69
29.00
620.73
30.11
620.77
31.23
620.81
32.37
620.85
33.54
620.89
34.71
620.93
35.91
620.97
37.13
621.01
38.36
621.05
39.61
621.09
40.87
621.13
42.16
621.17
43.46
621.21
44.78
621.25
46.12
621.29
47.47
621.33
48.84
621.37
50.22
621.41
51.62
621.45
53.04
621.49
54.47
621.53
55.92
621.57
57.38
621.61
58.86
621.65
60.36
621.69
61.87
621.73
63.39
621.77
64.93
621.81
66.49
621.85
68.06
621.89
69.64
621.93
71.24
621.97
72.85
622.01
74.47
622.05
76.11
622.09
77.76
622.13
79.43
622.17
81.11
622.21
82.80
622.25
84.50
622.29
86.22
622.33
87.95
622.37
89.69
622.41
91.44
622.45
93.21
622.49
94.99
622.53
96.78
622.57
98.58
622.61
100.39
622.65
102.21
622.69
104.05
Elevation
Primary
(feet)
(cfs)
622.73
105.89
622.77
107.75
622.81
109.61
622.85
111.49
622.89
113.38
622.93
115.27
622.97
117.18
623.01
119.09
623.05
121.02
623.09
122.95
623.13
124.89
623.17
126.84
623.21
128.80
623.25
130.77
623.29
132.75
623.33
134.73
623.37
136.73
623.41
138.73
623.45
140.73
623.49
142.75
623.53
144.77
623.57
146.80
623.61
148.83
623.65
150.87
623.69
152.92
623.73
154.98
623.77
157.03
623.81
159.10
623.85
161.17
623.89
163.25
623.93
165.33
623.97
167.41
624.01
169.50
624.05
171.59
624.09
173.69
624.13
175.79
624.17
177.90
624.21
180.01
624.25
182.12
624.29
184.23
624.33
186.35
624.37
188.47
624.41
190.59
624.45
192.72
624.49
194.84
624.53
196.97
624.57
199.10
624.61
201.22
624.65
203.35
624.69
205.48
624.73
207.61
624.77
209.74
Elevation
Primary
(feet)
(cfs)
624.81
211.87
624.85
214.00
624.89
216.13
624.93
218.25
624.97
220.37
625.01
222.50
625.05
224.62
625.09
226.73
625.13
228.85
625.17
230.96
625.21
233.07
625.25
235.17
625.29
237.27
625.33
239.36
625.37
241.46
625.41
243.54
625.45
245.62
625.49
247.69
625.53
249.76
625.57
251.82
625.61
253.87
625.65
255.92
625.69
257.96
625.73
259.99
625.77
262.01
625.81
264.02
625.85
266.02
625.89
268.01
625.93
269.99
625.97
271.96
626.01
273.92
626.05
275.87

SEEFRIED - USING CITY POND Charlotte 6-hr 100-yr 100 Yr. 6 Hr. Rainfall=5.33"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 39
Summary for Pond 47P: CLT Wetpond
Inflow Area = 96.000 ac, 82.29% Impervious, Inflow Depth = 4.35" for 100 Yr. 6 Hr. event
Inflow = 669.92 cfs @ 3.17 hrs, Volume= 34.772 of
Outflow = 274.55 cfs @ 3.39 hrs, Volume= 34.770 af, Atten= 59%, Lag= 13.6 min
Primary = 247.66 cfs @ 3.39 hrs, Volume= 34.265 of
Secondary = 26.88 cfs @ 3.39 hrs, Volume= 0.505 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 642.60' @ 3.39 hrs Surf.Area= 181,171 sf Storage= 717,663 cf
Plug -Flow detention time= 76.5 min calculated for 34.755 of (100% of inflow)
Center -of -Mass det. time= 77.9 min (282.7 - 204.7 )
Volume Invert Avail.Storage Storage Description
#1 637.00' 991,606 cf Custom Stage Data (Prismatic)-isted below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
637.00 86,751 0 0
638.00 97,974 92,363 92,363
638.50 100,000 49,494 141,856
644.00 209,000 849,750 991,606
Device Routing Invert Outlet Devices
#1 Primary 637.00' 4.00' long x 2.80' rise Sharp -Crested Rectangular Weir
2 End Contraction(s) 10.00' Crest Height
#2 Primary 639.80' 8.00' long Sharp -Crested Rectangular Weir End Contraction(s)
11.00' Crest Height
#3 Primary 641.70' 10.00' long Sharp -Crested Rectangular Weir2 End Contraction(s)
12.00' Crest Height
#4 Secondary 642.20' 40.00' long x 15.00' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63
Primary OutFlow Max=247.26 cfs @ 3.39 hrs HW=642.59' TW=626.01' (Dynamic Tailwater)
1=Sharp-Crested Rectangular Weir(Orifice Controls 102.86 cfs @ 10.68 fps)
2=Sharp-Crested Rectangular Weir(Weir Controls 117.07 cfs @ 5.63 fps)
3=Sharp-Crested Rectangular Weir(Weir Controls 27.32 cfs @ 3.12 fps)
Secondary OutFlow Max=26.54 cfs @ 3.39 hrs HW=642.59' TW=626.01' (Dynamic Tailwater)
L4= Broad -crested Rectangular Weir(Weir Controls 26.54 cfs @ 1.69 fps)

SEEFRIED - USING CITY POND Charlotte 6-hr 100-yr 100 Yr. 6 Hr. Rainfall=5.33"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 40
250
200
150
100
274.55 cfs
r..-I
Pond 47P: CLT Wetpond
Hyd rog raph
-+--+-+--+-+--+-+--+-+--+----+-+--+----+----+----+----+----
■Inflow
:fs — L _
L _ _ L
_ L _ _ L
_ J _ _ L _ L _ _ L _ J _
_ L
_ L _ _ L _ _I _ _ L _ _I _ _ L _ _I _ _ L _ _I _
ac
�UtfIOW
❑Primary
-------,---,----------,--,--------InfIolwl,Area=96�I.0001
r r
Secondary
--Ir-7--Ir-
--r-7--r-
--Ir--li--r-7--r-Peak-E1eV=,64Z.60'-
pp ��11 JJr�� AA'' ��yy
--' -
------------
,--r-r--r-r--r-r--r-r--r--I--r-r--r--I--r--I--r--I--r--I--r--I--
r--r-r--r-r--r-r--r-r--r--I--r-r--r--I--r--I--r--I--r--I--r--I--
L--L-L--L-L--L-L--L-L--L--'--L-L--L--'--L--'--L--'--L--'--L--'--
--'
- --
- -- - --' --'--
-----------L-I
--
- -- Sto'-6&7�1',�',63 cf-
ra
---- ---- -------------------
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SEEFRIED - USING CITY POND Charlotte 6-hr 100-yr 100 Yr. 6 Hr. Rainfall=5.33"
Prepared by Burton Engineering Printed 10/16/2019
HydroCAD®10.00-17 s/n 03513 ©2016 HydroCAD Software Solutions LLC Page 41
Stage -Discharge for Pond 47P: CLT Wetpond
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
637.00
0.00
0.00
0.00
637.10
0.41
0.41
0.00
637.20
1.16
1.16
0.00
637.30
2.12
2.12
0.00
637.40
3.26
3.26
0.00
637.50
4.54
4.54
0.00
637.60
5.94
5.94
0.00
637.70
7.46
7.46
0.00
637.80
9.07
9.07
0.00
637.90
10.78
10.78
0.00
638.00
12.58
12.58
0.00
638.10
14.45
14.45
0.00
638.20
16.40
16.40
0.00
638.30
18.42
18.42
0.00
638.40
20.50
20.50
0.00
638.50
22.64
22.64
0.00
638.60
24.83
24.83
0.00
638.70
27.08
27.08
0.00
638.80
29.38
29.38
0.00
638.90
31.72
31.72
0.00
639.00
34.11
34.11
0.00
639.10
36.54
36.54
0.00
639.20
39.01
39.01
0.00
639.30
41.51
41.51
0.00
639.40
44.05
44.05
0.00
639.50
46.62
46.62
0.00
639.60
49.22
49.22
0.00
639.70
51.85
51.85
0.00
639.80
54.51
54.51
0.00
639.90
57.98
57.98
0.00
640.00
61.89
61.89
0.00
640.10
66.09
66.09
0.00
640.20
70.54
70.54
0.00
640.30
75.20
75.20
0.00
640.40
80.07
80.07
0.00
640.50
85.11
85.11
0.00
640.60
90.32
90.32
0.00
640.70
95.69
95.69
0.00
640.80
101.22
101.22
0.00
640.90
106.88
106.88
0.00
641.00
112.68
112.68
0.00
641.10
118.62
118.62
0.00
641.20
124.68
124.68
0.00
641.30
130.85
130.85
0.00
641.40
137.15
137.15
0.00
641.50
143.56
143.56
0.00
641.60
150.07
150.07
0.00
641.70
156.69
156.69
0.00
641.80
164.45
164.45
0.00
641.90
173.15
173.15
0.00
642.00
182.51
182.51
0.00
642.10
192.40
192.40
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
642.20
202.76
202.76
0.00
642.30
216.94
213.55
3.39
642.40
234.32
224.73
9.59
642.50
253.96
236.28
17.68
642.60
275.49
248.17
27.32
642.70
298.57
260.39
38.18
642.80
323.11
272.92
50.19
642.90
348.29
285.74
62.55
643.00
374.41
298.84
75.56
643.10
402.21
312.22
89.99
643.20
431.06
325.86
105.20
643.30
461.35
339.75
121.60
643.40
492.69
353.88
138.81
643.50
524.77
368.25
156.52
643.60
557.77
382.84
174.93
643.70
591.29
397.66
193.63
643.80
625.60
412.69
212.91
643.90
661.10
427.92
233.18
644.00
697.41
443.36
254.05