SW1191201_Plansheet - Proposed Drainage Area_20220314

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DRAINAGE
ANALYSIS POINT A
AREA
(CN)
Q1
Q10
Q100
(Acres)
POST -DEVELOPMENT
17.13
92
23.16
42.85
47.56
Al WET POND A
POST -DEVELOPMENT
14.20
84
32.83
82.30
142.92
A2 BYPASS
POST -DEVELOPMENT
0.85
93
3.25
6.29
9.81
A3 BYPASS
POST -DEVELOPMENT 32.18 48.15 129.61 196.76
Al+A2+A3 (COMBINED)
ANALYSIS POINT B
POST -DEVELOPMENT
4.63
93
2.80
6.87
32.44
B1 WET POND B
POST -DEVELOPMENT
26.15
80
40.80
105.62
185.52
B2 BYPASS
POST -DEVELOPMENT
30.78
43.56
112.49
215.84
B1+B2 COMBINED
\ \ NOTE: POST -DEVELOPMENT FLOWS ARE LESS THAN PRE -DEVELOPMENT FLOW FOR THE 1-YEAR AND 10 YEAR
\ ~ \ \ \ 1 \ 1 \ \ \ \ \ \ \ I \ 24 t - - - - -- \ \ STORM EVENT AT ALL ANALYSIS POINTS. REFER TO CALCULATION BOOKLET FOR ADDITIONAL INFORMATION.
POST -DEVELOPMENT IMPERVIOUS AREA AND WATER QUALITY TREATMENT
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BUA TYPE
DRAINAGE AREA Al
DRAINAGE AREA B1
PROJECT AREA
ON -SITE BUILDINGS (SF)
64,267
2,219 (EXISTING)
66,486
- SITE STREETS (SF)
0
5,045
15,239
ON -SITE PARKING (SF)
465,306
156,522
687,134
ON -SITE SIDEWALKS (SF)
33,389
0
62,450
FUTURE (SF)
7,048
0
7,048
TOTAL IMPERVIOUS (SF)
570,010
163,786
838,357
TOTAL DRAINAGE AREA (SF)
746,327
201,683
1,498,464
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Revisions
No.
Date
SWR #1
2021 AUG 13
SWR #2
2022 FEB 24
Project Number: 1 111-B
Date: 2020 JAN 20
Drawn by: FS
POST -DEVELOPMENT
STORMWATER
MANAGEMENT PLAN
Sheet Number:
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INSET'B'
PRE -DEVELOPMENT STORMWATER QUANTITY CONTROL
PRE -DEVELOPMENT
DRAINAGE
AREA
(Acres)
(CN)
Q1
Q10
Q100
ANALYSIS POINT A
26.38
85
76.00
171.35
283.62
ANALYSIS POINT B
28.27
80
44.11
144.18
200.56
ANALYSIS POINT C
7.25
78
6.48
17.85
32.31
NOTE: POST -DEVELOPMENT FLOW IS LESS THAN PRE -DEVELOPMENT FLOW AT ALL ANALYSIS POINTS.
REFER TO CALCULATION BOOKLET FOR ADDITIONAL INFORMATION.
PRE -DEVELOPMENT IMPERVIOUS AREA AND WATER QUALITY TREATMENT
EXISTING IMPERVIOUS
DRAINAGE AREA
POST -DEVELOPMENT STORMWATER QUALITY CONTROL
PRE -DEVELOPMENT ONSITE IMPERVIOUS SURFACES = 5.41 ± ACRES
POST -DEVELOPMENT ONSITE IMPERVIOUS SURFACES = 19.25 ± ACRES
(INCLUDING FUTURE BUILDOUT)
IMPERVIOUS AREA REQUIRED TO BE TREATED = 13.84 ± ACRES
IMPERVIOUS AREA TO BE TREATED = 13.09 ± ACRES (WET DETENTION A)
IMPERVIOUS AREA TO BE TREATED = 3.76 ± ACRES (WET DETENTION B)
TOTAL TREATED IMPERVIOUS = 16.85 ± ACRES (A+B)
IMPERVIOUS AREA OVER -TREATED = 3.01 ± ACRES
THIS DRAWING IS FOR AGENCY REVIEW ONLY - NOT FOR CONSTRUCTION
*WETLANDS IN THE PROJECT AREA HAVE BEEN IDENTIFIED AND CONFIRMED BY
ACOE AND NCDEQ. NO IMPACTS ARE PROPOSED.
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POST -DEVELOPMENT STORMWATER QUANTITY CONTROL
DRAINAGE
ANALYSIS POINT A
AREA
(CN)
Q1
Q10
Q100
(Acres)
POST -DEVELOPMENT
17.13
92
23.16
42.85
47.56
Al WET POND A
POST -DEVELOPMENT
14.20
84
32.83
82.30
142.92
A2 BYPASS
POST -DEVELOPMENT
0.85
93
3.25
6.29
9.81
A3 BYPASS
POST -DEVELOPMENT
32.18
48.15 129.61 196.76
Al+A2+A3 COMBINED
ANALYSIS POINT B
POST -DEVELOPMENT 4.63
93 2.80 6.87 32.44
B1 WET POND B
POST -DEVELOPMENT
26.15
80
40.80
105.62
185.52
B2 BYPASS
POST -DEVELOPMENT
30.78
43.56
112.49
215.84
B1+B2 COMBINED
NOTE: POST -DEVELOPMENT FLOWS ARE LESS THAN PRE -DEVELOPMENT FLOW FOR THE 1-YEAR AND 10 YEAR
STORM EVENT AT ALL ANALYSIS POINTS. REFER TO CALCULATION BOOKLET FOR ADDITIONAL INFORMATION.
INSET'C'
POST -DEVELOPMENT IMPERVIOUS AREA AND WATER QUALITY TREATMENT
POST -DEVELOPMENT IMPERVIOUS TREATED IN SCM
DRAINAGE AREA
DRAINAGE AREA BASIN INFORMATION
BUA TYPE
DRAINAGE AREA Al
DRAINAGE AREA B1
PROJECT AREA
ON -SITE BUILDINGS (SF)
64,267
2,219 (EXISTING)
66,486
ON -SITE STREETS (SF)
0
5,045
15,239
ON -SITE PARKING (SF)
465,306
156,522
687,134
ON -SITE SIDEWALKS (SF)
33,389
0
62,450
FUTURE (SF)
7,048
0
7,048
TOTAL IMPERVIOUS (SF)
570,010
163,786
838,357
TOTAL DRAINAGE AREA (SF)
746,327
201,683
1,498,464
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Revisions
No.
Date
SWR #1
2021 AUG 13
SWR #2
2022 FEB 24
Project Number: 1711-B
Date: 2020 JAN 20
Drawn by: FS
PRE &
POST -DEVELOPMENT
STORMWATER
MANAGEMENT PLAN
Sheet Number:
■