HomeMy WebLinkAboutStormwater Management Plan C3EXISTING STATISTICS
EXISTING IMPERVIOUS AREA
SITE AREA: 0 SF
EXISTING PERVIOUS AREA
SITE AREA: 1,275,885 SF (29.3 AC)
PROPOSED STATISTICS
® LIMITS OF DISTURBANCE:
(A) PROPOSED NEW IMPERVIOUS AREA
CONCRETE AREA: 105,886 SF
- AC PAVING AREA: 352,025 SF
®LOT AREAS: 361,896 SF
(ASSUME 60% IMPER. 40% PER)
(B) TOTAL REPLACED IMPERVIOUS AREA
AREA: 0 SF
(C) PROPOSED LANDSCAPE (LANDSCAPE)
AREA: 137,370 SF
PROPOSED INFILTRATION BASIN
AREA: 77,413 SF
(D) TOTAL IMPERVIOUS AREA
AREA: 819,807 SF
(E) TOTAL PERVIOUS AREA
AREA: 456,048 SF
(F) NET IMPERVIOUS AREA
(NEW IMPERVIOUS + REPLACED IMPERVIOUS) -
(TOTAL EXISTING IMPERVIOUS -TOTAL IMPERVIOUS
AREA OF COMPLETE PROJECT)
AREA: 819,807 SF
REQUIRED STORMWATER MEASURES
TIER 1- RUNOFF REDUCTION
• AND/OR ROOF DRAIN DISCONNECT
• AND/OR MINIMIZE IMPERVIOUS AREAS
TIER 2 - WATER QUALITY
• ON -SITE RETENTION -BASED INFILTRATION
• CATCH BASIN INSERT FILTERS
• 4% RULE SAMPLE CALC
(IMPERVIOUS AREA OF LOT)*0.04 = REQUIRED TREATMENT AREA
• VOLUME SAMPLE CALC:
[TREATED AREA (IMPERVIOUS) x 1.2 in/hr (INTENSITY)]/l2
= REQUIRED TREATMENT VOLUME
TIER 3 - RETAIN 95TH PERCENTILE STORM EVENT
• SEE STORM WATER MANAGEMENT PLAN AND PACK EXHIBITS FOR
CALCULATIONS
TIER 4 - PEAK MANAGEMENT
• SEE DRAINAGE REPORT
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STORM WATER MANAGEMENT PLAN
MARCH 2O21
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AVILA RANCH EX2
0661-02—LP17