20190499 Ver 1_Stormwater_20190416

Exist Cond (DA #1)
1S
Proposed onditions
(D #
1)1)
2P
Wetpond 1
Exist Cond (DA#2) Exist Cond (DA#3)
Proposed Conditions Proposed Conditions
(DA#2)
Subcat Reach on Link
(DA#3)
Proposed Conditions
(DA#4 )

1804 - Apex Stormwater Pond - 04.03.2019
Prepared by Microsoft Printed 4/9/2019
HydroCAD® 10.00-24 s/n 04089 @2018 HydroCAD Software Solutions LLC Page 2
Area Listing (all nodes)
Area CN Description
(acres) (subcatchment-numbers)
12.055 79 50-75% Grass cover, Fair, HSG C (1 S, 3S, 4S, 5S, 6S, 7S, 8S)
1.439 96 Gravel surface, HSG C (3S, 7S)
6.580 98 Paved parking, HSG C (1 S, 4S, 6S)
8.355 73 Woods, Fair, HSG C (3S, 4S, 5S, 8S)
28.429 82 TOTAL AREA

1804 - Apex Stormwater Pond - 04.03.2019
Prepared by Microsoft Printed 4/9/2019
HydroCAD® 10.00-24 s/n 04089 @2018 HydroCAD Software Solutions LLC Page 3
Soil Listing (all nodes)
Area Soil Subcatchment
(acres) Group Numbers
0.000
HSG A
0.000
HSG B
28.429
HSG C 1 S, 3S, 4S, 5S, 6S, 7S, 8S
0.000
HSG D
0.000
Other
28.429
TOTAL AREA

1804 - Apex Stormwater Pond - 04.03.2019
Prepared by Microsoft Printed 4/9/2019
HydroCAD® 10.00-24 s/n 04089 @2018 HydroCAD Software Solutions LLC Page 4
Ground Covers (all nodes)
HSG -A HSG -B HSG -C HSG -D Other Total Ground Subcatchment
(acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers
0.000
0.000
12.055
0.000
0.000
12.055
50-75% Grass cover, Fair
1 S, 3S,
4S, 5S,
6S, 7S,
8S
0.000
0.000
1.439
0.000
0.000
1.439
Gravel surface
3S, 7S
0.000
0.000
6.580
0.000
0.000
6.580
Paved parking
1 S, 4S,
6S
0.000
0.000
8.355
0.000
0.000
8.355
Woods, Fair
3S, 4S,
5S, 8S
0.000
0.000
28.429
0.000
0.000
28.429
TOTAL AREA

1804 - Apex Stormwater Pond - 04.03.2019
Prepared by Microsoft Printed 4/9/2019
HydroCAD® 10.00-24 s/n 04089 @2018 HydroCAD Software Solutions LLC Page 5
Pipe Listing (all nodes)
Line# Node In -Invert Out -Invert Length Slope n Diam/Width Height Inside -Fill
Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches)
1 2P 260.00 259.50 50.0 0.0100 0.013 18.0 0.0 0.0

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 1 -yr Rainfall=2.88"
Prepared by Microsoft Printed 4/9/2019
HydroCAD® 10.00-24 s/n 04089 @2018 HydroCAD Software Solutions LLC Page 6
Time span=0.00-30.00 hrs, dt=0.05 hrs, 601 points
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment IS: Proposed Conditions Runoff Area=8.240 ac 69.54% Impervious Runoff Depth=2.05"
Tc=5.0 min CN=92 Runoff=29.06 cfs 1.406 of
Subcatchment 3S: Exist Cond (DA #1) Runoff Area=9.663 ac 0.00% Impervious Runoff Depth=0.99"
Tc=5.0 min CN=77 Runoff=17.07 cfs 0.796 of
Subcatchment4S: Exist Cond (DA#2) Runoff Area=1.410 ac 9.22% Impervious Runoff Depth=1.10"
Tc=5.0 min CN=79 Runoff=2.79 cfs 0.129 of
Subcatchment5S: Exist Cond (DA#3) Runoff Area=2.946 ac 0.00% Impervious Runoff Depth=1.10"
Tc=5.0 min CN=79 Runoff=5.83 cfs 0.270 of
Subcatchment6S: Proposed Conditions Runoff Area=1.610 ac 44.72% Impervious Runoff Depth=1.63"
Tc=5.0 min CN=87 Runoff=4.69 cfs 0.219 of
Subcatchment7S: Proposed Conditions Runoff Area=3.080 ac 0.00% Impervious Runoff Depth=1.10"
Tc=5.0 min CN=79 Runoff=6.10 cfs 0.283 of
Subcatchment8S: Proposed Conditions Runoff Area=1.480 ac 0.00% Impervious Runoff Depth=0.83"
Tc=5.0 min CN=74 Runoff=2.17 cfs 0.103 of
Pond 2P: Wetpond 1 Peak Elev=262.31' Storage=0.457 of Inflow=29.06 cfs 1.406 of
Outflow=10.45 cfs 1.399 of
Total Runoff Area = 28.429 ac Runoff Volume = 3.207 of Average Runoff Depth = 1.35"
76.85% Pervious = 21.849 ac 23.15% Impervious = 6.580 ac

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 1 -yr Rainfall=2.88"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 7
Summary for Subcatchment 1S: Proposed Conditions (DA#1)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 29.06 cfs @ 11.95 hrs, Volume= 1.406 af, Depth= 2.05"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr 1 -yr Rainfall=2.88"
Area (ac) CN
Description
5.730 98
Paved parking, HSG C
2.510 79
50-75% Grass cover, Fair, HSG C
8.240 92
Weighted Average
2.510
30.46% Pervious Area
5.730
69.54% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 1S: Proposed Conditions (DA#1)
Hydrograph
30
29.06 cfs
28
-1
H t I -RO nbf-ArOA--8.24I0 At
26
�-I-�up4ffVp-�upp�7-1.196tf
n
22
jR �p�h7
_ 5� min
�I fi l rt I� �I t I rt
�-I 4- 14 I� �-1 �- 14 1-4 �-I
20
18
16
0
_
LL 14
fi l rt
l
12
10
8
6111111111
4
4-- —4-
I�
—I --I fiI---I- I-1 r- 1I
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
29.06 cfs
-1
H t I -RO nbf-ArOA--8.24I0 At
�-I-�up4ffVp-�upp�7-1.196tf
n
jR �p�h7
_ 5� min
�I fi l rt I� �I t I rt
�-I 4- 14 I� �-1 �- 14 1-4 �-I
—I --I fiI---I- I-1 r- 1I
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

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 1 -yr Rainfall=2.88"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 8
Summary for Subcatchment 3S: Exist Cond (DA #1)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 17.07 cfs @ 11.96 hrs, Volume= 0.796 af, Depth= 0.99"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr 1 -yr Rainfall=2.88"
Area (ac) CN
Description
6.465 73
Woods, Fair, HSG C
1.379 96
Gravel surface, HSG C
1.819 79
50-75% Grass cover, Fair, HSG C
9.663 77
Weighted Average
9.663
100.00% Pervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
1E
1E
17
1E
1E
14
12
1'e
n 11
—" 1C
o E
LL
E
Subcatchment 3S: Exist Cond (DA #1)
Hydrograph
717 7 F - I TI 7 T 17 F- T I 1 ri
Runoff
17.07 cfs
filrt I� �I �I
filfi I� �
fiIrt 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)
-I
I- I -ROrbff-ArM--9.6613 U
-j �-I
0,1.1. 11 V1G11urp=�O•I7
�I
_amu_
fi rt qnr � �I
--5
c .-a mm
IIIfi1� 6-� =:jj
�I
fiI I -I I --I �-I t I -t I -I t -I
Li
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)

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 1 -yr Rainfall=2.88"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 9
Summary for Subcatchment 4S: Exist Cond (DA#2)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 2.79 cfs @ 11.96 hrs, Volume= 0.129 af, Depth= 1.10"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr 1 -yr Rainfall=2.88"
Area (ac) CN
Description
0.510 73
Woods, Fair, HSG C
0.130 98
Paved parking, HSG C
0.770 79
50-75% Grass cover, Fair, HSG C
1.410 79
Weighted Average
1.280
90.78% Pervious Area
0.130
9.22% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 4S: Exist Cond (DA#2)
Hydrograph
3 � 2.79 cfs �
iyi3� 1124-h r
11y1rO. iinfa11=2.8 '
-t L I Ruln-Off Areal -4.440 lack
2 Ruggffl Vlolluln�70•Il491 of
3
Ruln?f ifQe,p�h7l,.110',
Tc=5.0 m i n
1 1 1 1 1 1 1 =17�
II �IIIIIIII
111111
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

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 1 -yr Rainfall=2.88"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 10
Summary for Subcatchment 5S: Exist Cond (DA#3)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 5.83 cfs @ 11.96 hrs, Volume= 0.270 af, Depth= 1.10"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr 1 -yr Rainfall=2.88"
Area (ac) CN Description
0.120 73 Woods, Fair, HSG C
2.826 79 50-75% Grass cover, Fair, HSG C
2.946 79 Weighted Average
2.946 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 5S: Exist Cond (DA#3)
Hydrograph
��IIIII'�IIII�
6 1 1 1 1 1 1 1 1 1 1 5.83 cfs I I I I I I I I I iyJ3� Ii 2�'4 phi•
5 -4 -4 Hl'I�yiR of 11�i.8�''
I I Rulnbff Area=2.946 ac
4 1 1 1 1 1 1 1 1 RuggfflyolluTpp O.12701of
3 1 + + -—I 1 �inpf help"r� �1°'I
LL Tc=5.0 m i n
V I_I 1 1 1 1 1 I_1 1 1 I7�
2111 III1111111111111
+ I�
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

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 1 -yr Rainfall=2.88"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 11
Summary for Subcatchment 6S: Proposed Conditions (DA#2)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 4.69 cfs @ 11.96 hrs, Volume= 0.219 af, Depth= 1.63"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr 1 -yr Rainfall=2.88"
Area (ac) CN
Description
0.720 98
Paved parking, HSG C
0.890 79
50-75% Grass cover, Fair, HSG C
1.610 87
Weighted Average
0.890
55.28% Pervious Area
0.720
44.72% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 6S: Proposed Conditions (DA#2)
Hydrograph
5
4.69 cfs iy�e II 21'4=h%
—I T Ty�tair�fall=.�$'1'
4
Rulnbff Area=11.6110 lack
J�upgTVlollfuT".• 911-af
3 3 Run?f i Pe,p�h71.�3'
Tc=5.0 m i n
2 T1 T 1-7 11 T I T
111111111111111
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

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 1 -yr Rainfall=2.88"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 12
Summary for Subcatchment 7S: Proposed Conditions (DA#3)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 6.10 cfs @ 11.96 hrs, Volume= 0.283 af, Depth= 1.10"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr 1 -yr Rainfall=2.88"
Area (ac) CN Description
3.020 79 50-75% Grass cover, Fair, HSG C
0.060 96 Gravel surface, HSG C
3.080 79 Weighted Average
3.080 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 7S: Proposed Conditions (DA#3)
Hydrograph
IIID III'�IIII � � II
6 6.10 cfs l y�e�li X24 1h%
5 1 I Rulnbff Area=3.0810 lack
4 -T TRI"gTVIolump=�O•I2$31af
Delp h-1 10"
3 l -I ��r?ff � �T � r�min
E: 03 Tc=5.0
-NI 1—
2111 IIIIIIIIIIIIIIII
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

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 1 -yr Rainfall=2.88"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 13
Summary for Subcatchment 8S: Proposed Conditions (DA#4)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 2.17 cfs @ 11.97 hrs, Volume= 0.103 af, Depth= 0.83"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr 1 -yr Rainfall=2.88"
Area (ac) CN Description
1.260 73 Woods, Fair, HSG C
0.220 79 50-75% Grass cover, Fair, HSG C
1.480 74 Weighted Average
1.480 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 8S: Proposed Conditions (DA#4)
Hydrograph
IIII��IIII� IIII
1 1 1 1 1 1 1 2.17 cfs
iy�e-
2 1 1 1 1 1 1 1 11y% Rain6ll�=i68'I'
l l l i Rulnbff Area=1.4810 gad
RUggffl Vlolump70.11931 of
3 Rulnpff Delp�h7q.8T
�c=5.-min
� IIIIIIIIIIIIIII'
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

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 1 -yr Rainfall=2.88"
Prepared by Microsoft Printed 4/9/2019
HydroCAD® 10.00-24 s/n 04089 @2018 HydroCAD Software Solutions LLC Page 14
Summary for Pond 2P: Wetpond 1
Inflow Area =
8.240 ac, 69.54% Impervious, Inflow Depth = 2.05" for 1 -yr event
Inflow =
29.06 cfs @ 11.95 hrs, Volume= 1.406 of
Outflow =
10.45 cfs @ 12.07 hrs, Volume= 1.399 af, Atten= 64%, Lag= 7.2 min
Primary =
10.45 cfs @ 12.07 hrs, Volume= 1.399 of
Routing by Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Peak Elev= 262.31'
@ 12.07 hrs Surf.Area= 0.247 ac Storage= 0.457 of
Plug -Flow detention time= 48.7 min calculated for 1.396 of (99% of inflow)
Center -of -Mass det. time= 45.8 min ( 843.3 - 797.6 )
Volume Invert Avail.Storage Storage Description
#1 260.00' 1.963 of Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet)
(acres) (acre-feet) (acre-feet)
260.00
0.155 0.000 0.000
261.00
0.191 0.173 0.173
262.00
0.229 0.210 0.383
263.00
0.288 0.258 0.641
264.00
0.440 0.364 1.006
265.00
0.466 0.453 1.458
266.00
0.544 0.505 1.963
Device Routing
Invert Outlet Devices
#1 Primary
260.00' 18.0" Round Culvert
L= 50.0' RCP, square edge headwall, Ke= 0.500
Inlet/ Outlet Invert= 260.00'/ 259.50' S=0.0100'/' Cc= 0.900
n= 0.013, Flow Area= 1.77 sf
#2 Primary
263.00' 1.5" Vert. Orifice/Grate C= 0.600
#3 Primary
263.72' 30.0" W x 6.0" H Vert. Orifice/Grate X 4.00 C= 0.600
#4 Primary
265.00' 36.0" x 36.0" Horiz. Orifice/Grate C= 0.600
Limited to weir flow at low heads
Primary OutFlow Max=10.37 cfs @ 12.07 hrs HW=262.29' (Free Discharge)
1=Culvert (Barrel Controls 10.37 cfs @ 5.87 fps)
2=Orifice/Grate ( Controls 0.00 cfs)
3=Orifice/Grate ( Controls 0.00 cfs)
4=Orifice/Grate ( Controls 0.00 cfs)

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 1 -yr Rainfall=2.88"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 15
Pond 2P: Wetpond 1
Hydrograph
TI t I -t I -t 1-1 t -I T in I t --I t I t I -f I--�
29.06 cfs
30
1
-4- 1
1-4 -
28
T 1 T
17
Itt6ja�6:-J-
26
4-14
24
I T I
T I T
I T I
22
20
T
t I t
I -t 1-1
='1
IT
1
1-411
3 166
0
12
10.45 cfs
10
TI
T T
1�
8
6
TI
ti
t It
I -t 1 1
4
i
h i
l i,' l
I �
`r�iflbw�Ar�a�=8.12�da�
TI -LI
-t
a IC- vt -- 21.1
T 1 T
17
Itt6ja�6:-J-
4-14
1
T1+ 14 I�
11
1-1
LI T 1 1 1-1 L
T
IT
17 TI T IT IT IT T
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

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 10 -yr Rainfall=5.06"
Prepared by Microsoft Printed 4/9/2019
HydroCAD® 10.00-24 s/n 04089 @2018 HydroCAD Software Solutions LLC Page 16
Time span=0.00-30.00 hrs, dt=0.05 hrs, 601 points
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment IS: Proposed Conditions Runoff Area=8.240 ac 69.54% Impervious Runoff Depth=4.15"
Tc=5.0 min CN=92 Runoff=56.28 cfs 2.848 of
Subcatchment 3S: Exist Cond (DA #1) Runoff Area=9.663 ac 0.00% Impervious Runoff Depth=2.67"
Tc=5.0 min CN=77 Runoff=46.32 cfs 2.153 of
Subcatchment4S: Exist Cond (DA#2) Runoff Area=1.410 ac 9.22% Impervious Runoff Depth=2.85"
Tc=5.0 min CN=79 Runoff=7.18 cfs 0.335 of
Subcatchment5S: Exist Cond (DA#3) Runoff Area=2.946 ac 0.00% Impervious Runoff Depth=2.85"
Tc=5.0 min CN=79 Runoff=15.00 cfs 0.701 of
Subcatchment6S: Proposed Conditions Runoff Area=1.610 ac 44.72% Impervious Runoff Depth=3.62"
Tc=5.0 min CN=87 Runoff=10.03 cfs 0.486 of
Subcatchment7S: Proposed Conditions Runoff Area=3.080 ac 0.00% Impervious Runoff Depth=2.85"
Tc=5.0 min CN=79 Runoff=15.68 cfs 0.732 of
Subcatchment8S: Proposed Conditions Runoff Area=1.480 ac 0.00% Impervious Runoff Depth=2.41"
Tc=5.0 min CN=74 Runoff=6.43 cfs 0.298 of
Pond 2P: Wetpond 1 Peak Elev=263.84' Storage=0.938 of Inflow=56.28 cfs 2.848 of
Outflow=16.40 cfs 2.840 of
Total Runoff Area = 28.429 ac Runoff Volume = 7.553 of Average Runoff Depth = 3.19"
76.85% Pervious = 21.849 ac 23.15% Impervious = 6.580 ac

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 10 -yr Rainfall=5.06"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 17
Summary for Subcatchment 1S: Proposed Conditions (DA#1)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 56.28 cfs @ 11.95 hrs, Volume= 2.848 af, Depth= 4.15"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr 10 -yr Rainfall=5.06"
Area (ac) CN
Description
5.730 98
Paved parking, HSG C
2.510 79
50-75% Grass cover, Fair, HSG C
8.240 92
Weighted Average
2.510
30.46% Pervious Area
5.730
69.54% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 1S: Proposed Conditions (DA#1)
Hydrograph
T I —L I —1 1 —] LI ■Runoff
T I -+ I —i �-, 56.28 cfs fi —i I� �L
55
50
TIT
IT
Ti TI
45
40
14
1-
' 35
030
.2
Tlrt
I�
�I
25
20
ITI�I��IT-
15
10
5
y I 4-h
l T I T ibyFrlkcii-4411��.66-"
I I ROnbff ArOz1=8.2410 rad
�I T�up4ffVp�upp�2•I�8if
�I T rt
�nr 1 �'7-_j.r
Tc=5-a min
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)

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 10 -yr Rainfall=5.06"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 18
Summary for Subcatchment 3S: Exist Cond (DA #1)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 46.32 cfs @ 11.96 hrs, Volume= 2.153 af, Depth= 2.67"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr 10 -yr Rainfall=5.06"
Area (ac)
CN
Description
6.465
73
Woods, Fair, HSG C
1.379
96
Gravel
surface, HSG C
1.819
79
50-75% Grass cover, Fair, HSG C
9.663
77
Weighted
Average
9.663
100.00% Pervious Area
Tc Length
Slope
Velocity Capacity
Description
(min) (feet) (ft/ft)
(ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 3S:
Exist Cond (DA #1)
Hydrograph
50
4—- - - 4- 14
■Runoff
48
46
I
46.32 cfs
44/
4o
I— _I
H
t I '��y�lza�tAf�11��.66.1
38
36
14
1 --t
�-I -k I A A
�-I
4- 1-RO bf -Ar" -9.03
34
CI t 1
�I
�up� YgIuTP3?-!53r
232
30 8
_I
�I
�I
�P�h
n17- 1
0 24
_
LL 22
1�1�1��1�1-
-
-rirn
1:SIT-I:T
18
�I
116
4
12
10
L
— —
4
�II
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)

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 10 -yr Rainfall=5.06"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 19
Summary for Subcatchment 4S: Exist Cond (DA#2)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 7.18 cfs @ 11.96 hrs, Volume= 0.335 af, Depth= 2.85"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr 10 -yr Rainfall=5.06"
Area (ac) CN
Description
0.510 73
Woods, Fair, HSG C
0.130 98
Paved parking, HSG C
0.770 79
50-75% Grass cover, Fair, HSG C
1.410 79
Weighted Average
1.280
90.78% Pervious Area
0.130
9.22% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 4S: Exist Cond (DA#2)
Hydrograph
i I I i i T 17
7.18 cfs I
■Runoff
t- I
-t-
I -t
�-I
L I
I
1
1-1
Ll -L J
3 4
0
U-
3-/ 3 fi l rt I� �I fi l
2
1 1 1 1 1 1 1 I_I
1
-I type II 24 -hr
—I i Olyi• Fka infaI1=-6.0VI'
Rulnbff Areal=11.4110 lack
Rlu9Offl VlolluIne70.13�51 of
1 1 1 1 1 1 R1uIn-99 4e,�hr�'�►�I
Tc=5.0 m i n
fiI rt I� fiI rt6�=176
-4 H 1 -4 1 4 H
1111111
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)

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 10 -yr Rainfall=5.06"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 20
Summary for Subcatchment 5S: Exist Cond (DA#3)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 15.00 cfs @ 11.96 hrs, Volume= 0.701 af, Depth= 2.85"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr 10 -yr Rainfall=5.06"
Area (ac) CN Description
0.120 73 Woods, Fair, HSG C
2.826 79 50-75% Grass cover, Fair, HSG C
2.946 79 Weighted Average
2.946 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
1E
1E
14
12
12
11
1C
N
3 E
0
LL
I
Subcatchment 5S: Exist Cond (DA#3)
Hydrograph
T I T
IT
TI
� �-I
4- 1 ft"f-Ar"-2.9416
_I�4f!
VpYIIujnp7!3•IT91Lf
T l
fi l rtn I7i''I
�c--5.&
LITI
min
fi I T
l 1
i
L ---i
I I' I I T I I t-
T I T
IT
TI
filfi
I- I
nn„f
lf�T
- T I� 1 Tye
� �-I
4- 1 ft"f-Ar"-2.9416
_I�4f!
VpYIIujnp7!3•IT91Lf
T l
fi l rtn I7i''I
�c--5.&
min
TTITITITTITITITTI
L ---i
I I' I I T I I 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

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 10 -yr Rainfall=5.06"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 21
Summary for Subcatchment 6S: Proposed Conditions (DA#2)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 10.03 cfs @ 11.95 hrs, Volume= 0.486 af, Depth= 3.62"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr 10 -yr Rainfall=5.06"
Area (ac) CN
Description
0.720 98
Paved parking, HSG C
0.890 79
50-75% Grass cover, Fair, HSG C
1.610 87
Weighted Average
0.890
55.28% Pervious Area
0.720
44.72% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 6S: Proposed Conditions (DA#2)
Hydrograph
11
10
10.03
� —T T I �
cfs
9111111111111
$IIIIIIIIII
711111111111
N
36
0 5
LL
1 4 1-4 H
4-
3
2
T I T IT TI
1
I I I
IT T I i- p 1-24 h%
J OLylr
Ronbff ArOz1=1.6110 rad
F�ug4ffl Vo�uTP70-4$61 of
�- R�n�T � ph71. �'I
Tc=5.0 min
�141��-1+146� =�8-j
rt 1-1 t --I tIrt II t-1
1 TIT T TI
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

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 10 -yr Rainfall=5.06"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 22
Summary for Subcatchment 7S: Proposed Conditions (DA#3)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 15.68 cfs @ 11.96 hrs, Volume= 0.732 af, Depth= 2.85"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr 10 -yr Rainfall=5.06"
Area (ac) CN Description
3.020 79 50-75% Grass cover, Fair, HSG C
0.060 96 Gravel surface, HSG C
3.080 79 Weighted Average
3.080 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
17
1E
1E
14
12
12
11
w 1c
3
o E
LL
I
Subcatchment 7S: Proposed Conditions (DA#3)
Hydrograph
■Runoff
� I � I � � I 15.68 cfs
fi I rt
I�
�I
r - I
I- I -RO ri f f -Ar*21 _3.0$10 �d
14
I�
H
4 4 �nr ��p ��'�I
c54mm
LI
LI -L I- LI L1! II EI
�I
71rt I -I rI -Irt II �I
I -t H
�I
I� fy�i Ii-�4-h
r - I
I- I -RO ri f f -Ar*21 _3.0$10 �d
�I
��4#1 Vfsllurp�•1�2t-af
H
4 4 �nr ��p ��'�I
c54mm
LI
LI -L I- LI L1! II EI
�I
71rt I -I rI -Irt II �I
I -t 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)

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 10 -yr Rainfall=5.06"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 23
Summary for Subcatchment 8S: Proposed Conditions (DA#4)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 6.43 cfs @ 11.96 hrs, Volume= 0.298 af, Depth= 2.41"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr 10 -yr Rainfall=5.06"
Area (ac) CN Description
1.260 73 Woods, Fair, HSG C
0.220 79 50-75% Grass cover, Fair, HSG C
1.480 74 Weighted Average
1.480 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 8S: Proposed Conditions (DA#4)
Hydrograph
T T I T I I I
7 6.43 cfs I�
6-
5-/-1
5 1 1 T 7 1 1 Rulnbff Area=11.4810 lack
- �u�Qtf4VI°lIulnp=O.12�81 of
3 4 1 1 1 Ru,n?fl Pe,p "7F -I"1
LL 3 jc= -m5.0-mI I I I I I I I I I I I �Nl 17�
2 T T TI T 1T 1 TI T 17
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

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 10 -yr Rainfall=5.06"
Prepared by Microsoft Printed 4/9/2019
HydroCAD® 10.00-24 s/n 04089 @2018 HydroCAD Software Solutions LLC Page 24
Summary for Pond 2P: Wetpond 1
Inflow Area = 8.240 ac, 69.54% Impervious, Inflow Depth = 4.15" for 10 -yr event
Inflow = 56.28 cfs @ 11.95 hrs, Volume= 2.848 of
Outflow = 16.40 cfs @ 12.09 hrs, Volume= 2.840 af, Atten= 71 %, Lag= 8.4 min
Primary = 16.40 cfs @ 12.09 hrs, Volume= 2.840 of
Routing by Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Peak Elev= 263.84' @ 12.09 hrs Surf.Area= 0.416 ac Storage= 0.938 of
Plug -Flow detention time= 44.4 min calculated for 2.840 of (100% of inflow)
Center -of -Mass det. time= 42.6 min ( 820.6 - 778.1 )
Volume Invert Avail.Storage Storage Description
#1 260.00' 1.963 of Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (acres) (acre-feet) (acre-feet)
260.00 0.155 0.000 0.000
261.00 0.191 0.173 0.173
262.00 0.229 0.210 0.383
263.00 0.288 0.258 0.641
264.00 0.440 0.364 1.006
265.00 0.466 0.453 1.458
266.00 0.544 0.505 1.963
Device Routing Invert Outlet Devices
#1 Primary 260.00' 18.0" Round Culvert
L= 50.0' RCP, square edge headwall, Ke= 0.500
Inlet/ Outlet Invert= 260.00'/ 259.50' S=0.0100'/' Cc= 0.900
n= 0.013, Flow Area= 1.77 sf
#2 Primary 263.00' 1.5" Vert. Orifice/Grate C= 0.600
#3 Primary 263.72' 30.0" W x 6.0" H Vert. Orifice/Grate X 4.00 C= 0.600
#4 Primary 265.00' 36.0" x 36.0" Horiz. Orifice/Grate C= 0.600
Limited to weir flow at low heads
Primary OutFlow Max=16.28 cfs @ 12.09 hrs HW=263.84' (Free Discharge)
1=Culvert (Inlet Controls 14.95 cfs @ 8.46 fps)
2=Orifice/Grate (Orifice Controls 0.05 cfs @ 4.24 fps)
3=Orifice/Grate (Orifice Controls 1.28 cfs @ 1.10 fps)
4=Orifice/Grate ( Controls 0.00 cfs)

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr 10 -yr Rainfall=5.06"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 25
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)
e Inflow
❑ Primary
Pond 2P: Wetpond 1
Hydrograph
LI
I I -1
1-1
1 L1 -L i i-1 1 L1 L I L
so
—I
56.28 cfs `nfli i' X11" �
55
a=iS.2
0�ak 1 �V-131.64
50
45
Itbr�ag�01.3 a
40
1 tl
t I
I�
35
11111111
c30
" 25
14
1-4
4-1 I -4 I�
20
1 —tj
16.40 cfs
15
IIID
10
i
1 1 1
1 1 1
V I I I
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)
e Inflow
❑ Primary

1804 - Apex Stormwater Pond - 04.03.2019 Type// 24 -hr Water Quality Rainfall= 1. 00 "
Prepared by Microsoft Printed 4/9/2019
HydroCAD® 10.00-24 s/n 04089 @2018 HydroCAD Software Solutions LLC Page 26
Time span=0.00-30.00 hrs, dt=0.05 hrs, 601 points
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment IS: Proposed Conditions Runoff Area=8.240 ac 69.54% Impervious Runoff Depth=0.40"
Tc=5.0 min CN=92 Runoff=5.97 cfs 0.276 of
Subcatchment 3S: Exist Cond (DA #1) Runoff Area=9.663 ac 0.00% Impervious Runoff Depth=0.05"
Tc=5.0 min CN=77 Runoff=0.14 cfs 0.039 of
Subcatchment4S: Exist Cond (DA#2) Runoff Area=1.410 ac 9.22% Impervious Runoff Depth=0.07"
Tc=5.0 min CN=79 Runoff=0.08 cfs 0.008 of
Subcatchment5S: Exist Cond (DA#3) Runoff Area=2.946 ac 0.00% Impervious Runoff Depth=0.07"
Tc=5.0 min CN=79 Runoff=0.16 cfs 0.017 of
Subcatchment6S: Proposed Conditions Runoff Area=1.610 ac 44.72% Impervious Runoff Depth=0.22"
Tc=5.0 min CN=87 Runoff=0.61 cfs 0.030 of
Subcatchment7S: Proposed Conditions Runoff Area=3.080 ac 0.00% Impervious Runoff Depth=0.07"
Tc=5.0 min CN=79 Runoff=0.16 cfs 0.018 of
Subcatchment8S: Proposed Conditions Runoff Area=1.480 ac 0.00% Impervious Runoff Depth=0.02"
Tc=5.0 min CN=74 Runoff=0.00 cfs 0.003 of
Pond 2P: Wetpond 1 Peak Elev=260.59' Storage=0.098 of Inflow=5.97 cfs 0.276 of
Outflow=1.63 cfs 0.270 of
Total Runoff Area = 28.429 ac Runoff Volume = 0.391 of Average Runoff Depth = 0.17"
76.85% Pervious = 21.849 ac 23.15% Impervious = 6.580 ac

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr Water Quality Rainfall=1.00"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 27
Summary for Subcatchment 1S: Proposed Conditions (DA#1)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 5.97 cfs @ 11.96 hrs, Volume= 0.276 af, Depth= 0.40"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr Water Quality Rainfall=1.00"
Area (ac) CN
Description
5.730 98
Paved parking, HSG C
2.510 79
50-75% Grass cover, Fair, HSG C
8.240 92
Weighted Average
2.510
30.46% Pervious Area
5.730
69.54% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 1S: Proposed Conditions (DA#1)
Hydrograph
Illi I�
6 1 T T 5.97 cfs T T 1 T4
y e II z4 -hr
T TI Afflk6r IQ641it� Rainfall=11.01'
5 IRunoff Area=8 240 a � �i�il�
-Runoff Volume=027"f
4 'I I n6fi deptf=b.�O�'
N
3 -I T I T T 1 T TO=" FilO
i° 3
1 1 1 1 1 1 1 1 1 I C�79F
21 �� I 11111111111111
TIITTTII�TT'-
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

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr Water Quality Rainfall=1.00"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 28
Summary for Subcatchment 3S: Exist Cond (DA #1)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 0.14 cfs @ 12.05 hrs, Volume= 0.039 af, Depth= 0.05"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr Water Quality Rainfall=1.00"
Area (ac) CN
Description
6.465 73
Woods, Fair, HSG C
1.379 96
Gravel surface, HSG C
1.819 79
50-75% Grass cover, Fair, HSG C
9.663 77
Weighted Average
9.663
100.00% Pervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 3S: Exist Cond (DA #1)
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)
❑Runoff
4- 1-4
0.14 cfs
-
0.15
-
-Nater Qu#My Iioi0fali=�l •pOf
0.14
I 1--]
F -I
7 T066o O—th4-IDS'
IIIIIIIIIIIIII
0.13
�
II
0.12
T L1 I
Irtl�
�Ifilrt�
0.11
0.1
0.09
w
`°°$
3
I�14141
I�
00.07
LL
0.06
TIT
1
1
0.05
1
+
I
—
0.04
0.03
L1
1
1-1
U L
0.02
0.01
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
4- 1-4
0.14 cfs
-
II I -iy 1[-24-br
-
-Nater Qu#My Iioi0fali=�l •pOf
�u:ioffrt/d= = 1% la
I 1--]
F -I
7 T066o O—th4-IDS'
IIIIIIIIIIIIII
T =
II
1 j
T L1 I
Irtl�
�Ifilrt�
� 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)
❑Runoff

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr Water Quality Rainfall=1.00"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 29
Summary for Subcatchment 4S: Exist Cond (DA#2)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 0.08 cfs @ 12.01 hrs, Volume= 0.008 af, Depth= 0.07"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr Water Quality Rainfall=1.00"
Area (ac) CN
Description
0.510 73
Woods, Fair, HSG C
0.130 98
Paved parking, HSG C
0.770 79
50-75% Grass cover, Fair, HSG C
1.410 79
Weighted Average
1.280
90.78% Pervious Area
0.130
9.22% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
o.oa
0.075
0.07
0.065
0.06
0.055
0.05
0.045
0 0.04
LL 0.035
0.03
0.025
0.02
0.015
0.01
0.005
Subcatchment 4S: Exist Cond (DA#2)
Hydrograph
_ � � � � �� � � � ❑Runoff
0.08 cfs I� I—I � I -r I TI
12_4 h�
�I
+
fi l
rt
l rt
I-1
r
�I
4-
1-t
I
�I
1
1 1
1 1
1
+
1
I-
ype -
fi I-WaWQuolity ROipa11=410-.Qarr
�lur�ofF�/ol' u�ii 408 a�
Ru6o�F �epthOO.007r
T �T77
l l 1 l7
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)

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr Water Quality Rainfall=1.00"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 30
Summary for Subcatchment 5S: Exist Cond (DA#3)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 0.16 cfs @ 12.01 hrs, Volume= 0.017 af, Depth= 0.07"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr Water Quality Rainfall=1.00"
Area (ac) CN Description
0.120 73 Woods, Fair, HSG C
2.826 79 50-75% Grass cover, Fair, HSG C
2.946 79 Weighted Average
2.946 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 5S: Exist Cond (DA#3)
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)
Hydrograph
0.17
1
4- 14 1-1
�--I
� I
� I - I I � I �
❑Runoff
0.16
LI
I
1
0 16 cfs
1�
LI
L
I Q 4y�el 1�244
0.15
0.14
_
•I�a�eu01 y �liaI I •Q�
0.13
0.12
-
+
-
-
�
u ff �re - .9 a
olu 4f
0.11
-�- I+
I-+
H
H+
-I
+R�o h=[O- � I�
w 0.1
14
0 0.09
� I+
4
_
14 H 77S
U.
N
0.07
0.06
0.05
l l
l
l l
0.04
0.03
�I--rI-T
1-11
7-1 1-T
0.02
0.01
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)

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr Water Quality Rainfall=1.00"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 31
Summary for Subcatchment 6S: Proposed Conditions (DA#2)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 0.61 cfs @ 11.97 hrs, Volume= 0.030 af, Depth= 0.22"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr Water Quality Rainfall=1.00"
Area (ac) CN
Description
0.720
98
Paved parking, HSG C
0.890
79
50-75% Grass cover, Fair,
HSG C
1.610
87
Weighted Average
0.890
55.28% Pervious Area
0.720
44.72% Impervious Area
Tc Length
Slope Velocity Capacity
Description
(min)
(feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 6S: Proposed Conditions (DA#2)
Hydrograph
—
—
❑Runoff
0.65-:/0.61
0.6
T
cfs
T
T T T T +y el 11 4-�r
0.55
V
1 1 Vy$et Quality Roirifajl�1.901'
0.5
T I
_
T I T T
TRuToff �30 of
n045
V=610
0.4
T 1
T 1 7
T TK6- off O-th=0.222�'
U)Q
0.35-,//T
3
1
T
Tin
T T� S�d�■
° 0.3
LL
ld IIVV
1
TI T I --t r -I TI T Irt
0.25
0.2
1 1 1 1
0.15-/-I
TIT 14 I +14
0.1
0 05
� 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)

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr Water Quality Rainfall=1.00"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 32
Summary for Subcatchment 7S: Proposed Conditions (DA#3)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 0.16 cfs @ 12.01 hrs, Volume= 0.018 af, Depth= 0.07"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr Water Quality Rainfall=1.00"
Area (ac) CN Description
3.020 79 50-75% Grass cover, Fair, HSG C
0.060 96 Gravel surface, HSG C
3.080 79 Weighted Average
3.080 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
0.1 E
0.17
0.1 E
0.1 E
0.14
0.1
0.12
0.11
0.1
0 0.0=
LL 0.0E
0.01
Subcatchment 7S: Proposed Conditions (DA#3)
Hydrograph
LT1I
14 Ty a II 24hr
4 1—I
I-W$et Qu#My Iii jl=jI•Q07
�I
u�=rUZ73.7 100 la
141
t-
I
L 1 1:1 ID T7�=
L T 17 EI L- IT -I
LIIU
IT
I
I L
LI
T
IZ
LI
T
I-1
1 F
fil
rt
Irt I
I �-I
tit1�
1 t -I
T
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
❑ Runoff
14 Ty a II 24hr
4 1—I
I-W$et Qu#My Iii jl=jI•Q07
u�=rUZ73.7 100 la
��Ud1o�t�1�0•�1�
I
L 1 1:1 ID T7�=
L T 17 EI L- IT -I
1-1r-IfirtIIrl
IT
fit t 1 t-
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)
❑ Runoff

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr Water Quality Rainfall=1.00"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 33
Summary for Subcatchment 8S: Proposed Conditions (DA#4)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 0.00 cfs @ 13.44 hrs, Volume= 0.003 af, Depth= 0.02"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24 -hr Water Quality Rainfall=1.00"
Area (ac) CN Description
1.260 73 Woods, Fair, HSG C
0.220 79 50-75% Grass cover, Fair, HSG C
1.480 74 Weighted Average
1.480 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
0.004
0.004
0.004
0.003
0.003
0.003
0.003
0.003
H 0.002
0.002
c 0.002
LL 0.002
0.002
0.001
0.001
0.001
0.001
0.001
0.000
0.000
Subcatchment 8S: Proposed Conditions (DA#4)
Hydrograph
—� —4 �—I � 1 4- 14 I-4 1 4- 14 I-4 ❑Runoff
0.00 cfs
�I
I-4
1
1-4
�I
+
14
1�
�I
�I
+
I-+
I-
f
fil
t
I—�
I-1
7
T
I —F
I�
C
D
I
17
1-1
CI
Z
I7
D
4-
14
IA
�I+
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)
I-4
�— 1
4-1`,
Ip��y6� n �n-nh-
oin
%QRuwT
�4iOfajI�Qr
I4:
epth�p2t-
17
FI
T'
Z
I7
D
�I
�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)

1804 - Apex Stormwater Pond - 04.03.2019 Type// 24 -hr Water Quality Rainfall= 1. 00 "
Prepared by Microsoft Printed 4/9/2019
HydroCAD® 10.00-24 s/n 04089 @2018 HydroCAD Software Solutions LLC Page 34
Summary for Pond 2P: Wetpond 1
Inflow Area =
8.240 ac, 69.54% Impervious, Inflow Depth = 0.40" for Water Quality event
Inflow =
5.97 cfs @ 11.96 hrs, Volume= 0.276 of
Outflow =
1.63 cfs @ 12.11 hrs, Volume= 0.270 af, Atten= 73%, Lag= 8.7 min
Primary =
1.63 cfs @ 12.11 hrs, Volume= 0.270 of
Routing by Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Peak Elev= 260.59'
@ 12.11 hrs Surf.Area= 0.176 ac Storage= 0.098 of
Plug -Flow detention time= 92.8 min calculated for 0.270 of (98% of inflow)
Center -of -Mass det. time= 80.0 min ( 924.1 - 844.2 )
Volume Invert Avail.Storage Storage Description
#1 260.00' 1.963 of Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet)
(acres) (acre-feet) (acre-feet)
260.00
0.155 0.000 0.000
261.00
0.191 0.173 0.173
262.00
0.229 0.210 0.383
263.00
0.288 0.258 0.641
264.00
0.440 0.364 1.006
265.00
0.466 0.453 1.458
266.00
0.544 0.505 1.963
Device Routing
Invert Outlet Devices
#1 Primary
260.00' 18.0" Round Culvert
L= 50.0' RCP, square edge headwall, Ke= 0.500
Inlet/ Outlet Invert= 260.00'/ 259.50' S=0.0100'/' Cc= 0.900
n= 0.013, Flow Area= 1.77 sf
#2 Primary
263.00' 1.5" Vert. Orifice/Grate C= 0.600
#3 Primary
263.72' 30.0" W x 6.0" H Vert. Orifice/Grate X 4.00 C= 0.600
#4 Primary
265.00' 36.0" x 36.0" Horiz. Orifice/Grate C= 0.600
Limited to weir flow at low heads
Primary OutFlow Max=1.62 cfs @ 12.11 hrs HW=260.59' (Free Discharge)
1=Culvert (Barrel Controls 1.62 cfs @ 3.71 fps)
2=Orifice/Grate ( Controls 0.00 cfs)
3=Orifice/Grate ( Controls 0.00 cfs)
4=Orifice/Grate ( Controls 0.00 cfs)

1804 - Apex Stormwater Pond - 04.03.2019 Type 1124 -hr Water Quality Rainfall=1.00"
Prepared by Microsoft Printed 4/9/2019
HydroCADO 10.00-24 s/n 04089 © 2018 HydroCAD Software Solutions LLC Page 35
6
5
4
a
U
3
0 3
LL
2
1
Pond 2P: Wetpond 1
Hydrograph
Inflow
5IIIH.97 CfS — ❑ Primary
J njj w Ar a=8.246
1 1.63 cfs 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)

Q (cfs)
Project #
Project Name
1804
Town of Apex Electric Operations Center
Existing
DA#1 DA#2 DA#3 TOTAL
DA#1
DA#2
Proposed
DA#3
DA#4
TOTAL
Water Quality - 1" Rainfall
0.14
0.08 0.16
0.38
5.97
0.61
0.16
0.00
6.74
1-YR
17.07
2.79 5.83
25.69
29.06
4.69
6.10
2.17
42.02
10-YRi
46.32
7.18 15.00
68.50 1
56.28
10.03
15.68
6.43
88.42
Volume
DA#1
Existing
DA#2 DA#3
TOTAL
DA#1
DA#2
Proposed
DA#3
DA#4
TOTAL
(acre-feet)
Water Quality - 1" Rainfall
0.039
0.008 0.017
0.064
0.276
0.030
0.018
0.003
0.327
1-YR
0.749
0.129 0.270
1.148
1.406
0.219
0.283
0.103
2.011
10-YRI
2.153
0.335 0.701
3.189 1
2.848
0.486
0.732
0.298
4.364

Orifice Sizing
Given:
Normal Pool Elevation 263.00 ft
Temporary Pool Elevation 263.72 ft
Temporary Pool volume 11456.28 cubic ft
1.5" Orifice
Q=aCV(2gh)
a=
0.01227 sq. ft
C=
0.60
g=
32.2 ft/sec^2
h=
0.66 ft
Q=
0.04799 cfs
2 day drawdown
8292.672 cubic ft
5 day drawdown
20731.68 cubic ft

Total Volume
Forebay
Elevation
Main Pool
Cumulative Vol (cu.ft.)
Elevation
Area (s.f.)
Volume (cu.ft.)
Cumulative Vol (cu.ft.)
260.00
6750.09
0.00
0.00
261.00
8336.53
7543.31
7543.31
262.00
9979.52
9158.02
16701.33
263.00
12550.03
11264.77
27966.11
Forebay
Elevation
Area (s.f.) Volume (cu.ft.)
Cumulative Vol (cu.ft.)
260.00
561.51 0.00
0.00
261.00
1366.30 963.91
963.91
262.00
1964.94 1665.62
2629.52
263.00
3664.10 2814.52
5444.04
Elevation
Area (s.f.)
Volume (cu.ft.)
Cumulative Vol (cu.ft.)
260.00
6750.09
0.00
0.00
261.00
8336.53
7543.31
7543.31
262.00
9979.52
9158.02
16701.33
263.00
12550.03
11264.77
27966.11
264.00
19190.00
15870.01
43836.12
265.00
21442.39
20316.19
64152.31
266.00
23694.77
22568.58
86720.89
Volume (cu.ft.) Elev (ft)
WQ (1.0") 1 11456.28 263.72