Environmental Engineering Reference
In-Depth Information
WORKSHEET 6 . SMALL SITE / SMALL IMPERVIOUS AREA
EXCEPTION FOR PEAK RATE MITIGATION CALCULATIONS
The following conditions must be met for exemption from peak rate analysis for small
sites under CG-1:
The 2-Year Runoff Volume increase must be met in BMPs designed in accordance
with Manual Standards
Total Site Impervious Area may not exceed
1 acre.
Maximum Development Area is
10 acres.
Maximum site impervious cover is 50%.
No more than 25% Volume Control can be in Non-structural BMPs
Infiltration BMPs must have an infiltration rate of 0.5 in/hr.
Percent
Impervious
Total
Impervious
Site Area
10 acre
10%
1 acre
5 acre
20%
1 acre
2 acre
50%
1 acre
1 acre
50%
0.5 acre
0.5 acre
50%
0.25 acre
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