20140376 Ver 1_Stormwater Management Plan_20140410

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Date I By Designer Scale
W &R 1" = 200'
Drawn By Date JAMES STREET STATION
RSF /DW 3/3/201
Checked By Job No.
DW 2110169.00 11TOWN OF APEX NORTH CAROLINA
EXHIBIT A -1
STORMWATER PRE DEVELOPMENT
DRAINAGE AREA MAP
a 100 2OD' 400'
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SCALE : l 20(
WITHERS & RAVEN EL.. Sheet No.
ENGINEERS I PLANNERS I SURVEYORS 1 of 2
115 MocKenan Drive Cary, North Carolina 27511 L
tel: [phone] www.withersrovenel.com license No. C -0832
SITE PEAK ATTENUATION SUMMARY
Storm Event
Pre - Development
Peak Flow
(Cfs)
Past - Development
Peak Flaw w/ BMP
(cfs)
Net
Change
(cfsl
Net
Change
M
1 -Year
4.95
3.66
-1,29
-26.1%
10 -Year
46.79
36.60
-10.19
-21.8%
100 -Year
96.42
138.43
42.01
43.6%
BMP 1 - WET DETENTION POND
OUTFLOW SUMMARY
PEAK FLOW SUMMARY - POND DATA
Storm Event
Peak Water
Surface Elevation
(ft)
Freeboard
(ft}
Total
Peak Outflow
(cfs)
JAMES STREET STATION
Y Q
EXHIBIT A -2
STORMWATER POST DEVELOPMENT
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WITHERS RTA ENEL,,,
ENGINEERS I PLANNERS I SURVEYORS
Sheet No.
2 Of 2
1 -Year
441.42
1.83
0.14
10 -Year
442.46
0,79
8.28
100 -Year
443.15
0.10
44,33
JAMES STREET STATION
TOWN OF APEX WAKE COUNTY
NORTH CAROLINA
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SCALE: 1" Im 3OD
No.
Revision Date By
-
Designer
W &R
Drawn By _
RSF /DW
Scale
1" =300'
Date
3/3/2014
JAMES STREET STATION
Y Q
EXHIBIT A -2
STORMWATER POST DEVELOPMENT
� /� �/ i�
WITHERS RTA ENEL,,,
ENGINEERS I PLANNERS I SURVEYORS
Sheet No.
2 Of 2
1 -Year
436.94
TOWN OF APEX NORTH CAROLINA
p
DRAINAGE AREA MAP
115 MacKenon Drive Cary, North Carolina 27511
tel.. 919 - 469 -3340 www.withersrovenal.com License No. C -0832
437.72
Checked By
DW
Job No.
2110169.00
100 -Year
438.34
BMP 2 - WET DETENTION POND
OUTFLOW SUMMARY
PEAK FLOW SUMMARY - POND DATA
Storm Event
Peak Water
Surface Elevation
(ft)
Freeboard
(ft)
Total
Peak Outflow
(cfs)
CM- Transportation
Date
Planning
Date
1 -Year
436.94
3.06
0.07
10 -Year
437.72
2.28
3.40
100 -Year
438.34
1.66
15.22
BMP 3 - WET DETENTION POND
OUTFLOW SUMMARY
PEAK FLOW SUMMARY - POND DATA
Storm Event
Peak Water
Surface Elevation
(ft)
Freeboard
(ft)
Total
Peak Outflow
(cfs)
CM- Transportation
Date
Planning
Date
1 -Year
425.53
2.72
0.39
10 -Year
426.56
1.69
9.98
100 -Year
427.04
1,21
35,99
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The signatures affixed below certify that this sheet has been reviewed and approved solely per
` the certifications signed on the cover sheet of these construction plans,
CM- Engineering
Date
Public works -Env. Programs
Date
CM- Transportation
Date
Planning
Date
CM- Building Inspections
Date
Planning- Transportation
Date
Public Works - Water /Sewer
Date
Fire
Date
Public Works - Electric
Date
Parks, Recreation & Cultural Res.
Date
Public Works -S &E
Date
WITHERS RAVENEL
ENGINEERS I PLANNERS I SURVEYORS
115 MacKenon Drive Cary, North Carolina 27511 tel: [phone] www.withersrovenel.com License No. C -0832
Pffl.