SW5220302_Plansheet C4.1 - Proposed Drainage Area_20220406

POST -DEVELOPMENT WATER QUALITY SUMMARY
DRAINAGE BASIN BUILT UPON AREA
BUA TYPE
DRAINAGE AREA A
PROJECT AREA
ON -SITE BUILDINGS (SF)
0
0
ON -SITE STREETS (SF)
0
0
ON -SITE PARKING (SF)
118,275
118,275
ON -SITE SIDEWALKS (SF)
0
0
OFF -SITE (SF)
836
836
FUTURE (SF)
0
0
TOTAL IMPERVIOUS (SF)
119,081
119,081
TOTAL DRAINAGE AREA (SF)
266,245
550,548
STING OFFSITE IMPERVIOUS (BYPASS)
POST -DEVELOPMENT ONSITE IMPERVIOUS CAPTURED IN SCM
(2.73 ± ACRES)
DRAINAGE AREA
TIME OF CONCENTRATION FLOW LINE
1. ALL PROPOSED IMPERVIOUS AREA IS CAPTURED IN THE BIORETENTION CELL.
2. A BIORETENTION CELL IS BEING PROVIDED TO CONTROL AND TREAT RUNOFF FROM THE DEVELOPMENT AREA IN
DRAINAGE AREA A.
3. FOR STORMWATER MANAGEMENT, THERE IS ONE ANALYSIS POINT IN AN EXISTING CREEK TO THE NORTHWEST OF
THE SITE. DRAINAGE AREA W IS THE AREA WITHIN THE DISTURBED AREA THAT DRAINS TO THE BIORETENTION CELL.
DRAINAGE AREA'B' IS THE AREA WITHIN THE DISTURBED AREA THAT DRAINS TO THE ANALYSIS POINT BUT BYPASSES
THE BIORETENTION. POST DEVELOPMENT RUNOFF HAS BEEN DESIGNED TO BE LESS THAN PRE DEVELOPMENT
RUNOFF FOR THE 1 YEAR, 24 HOUR STORM AT THE ANALYSIS POINT.
4. THIS DRAWING IS FOR AGENCY REVIEW ONLY - NOT FOR CONSTRUCTION.
5. THERE ARE NO WETLANDS ON -SITE, AS DETERMINED BY CHRIS INSCORE, AWB (TIMMONS GROUP).
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PRE -DEVELOPMENT WATER QUANTITY SUMMARY
DRAINAGE
ANALYSIS POINT
AREA COMPOSITE C Q1 Q10 Q100
(Acres)
PRE -DEVELOPMENT 17.58 .35 9.43 15.87 22.09
NOTE: POST -DEVELOPMENT FLOW IS LESS THAN PRE -DEVELOPMENT FLOW AT ANALYSIS POINT
REFER TO CALCULATION BOOKLET FOR ADDITIONAL INFORMATION.
NOTE: POST -DEVELOPMENT FLOW IS LESS THAN PRE -DEVELOPMENT FLOW AT ANALYSIS POINT
REFER TO CALCULATION BOOKLET FOR ADDITIONAL INFORMATION.
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DRAINAGE
ANALYSIS POINT
AREA
COMPOSITE C
Q1
Q10
Q100
COMMENTS
(Acres)
POST DEVELOPMENT
6.11
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6.18
6.25
7.98
BIORETENTION SCM
A
POST -DEVELOPMENT
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6.60
11.11
15.47
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ANALYSIS POINT
POST -DEVELOPMENT
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9.19
17.23
23.44
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NOTE: POST -DEVELOPMENT FLOW IS LESS THAN PRE -DEVELOPMENT FLOW FOR THE 1-YEAR, 24-HOUR STORM AT
ANALYSIS POINT. REFER TO CALCULATION BOOKLET FOR ADDITIONAL INFORMATION.
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