Environmental Engineering Reference
In-Depth Information
total runoff volume from a site (supply for capture-reuse system), the total
overflow volume from the site (exceeding the design storage volume), and thus
the total runoff volume captured and the percentage of runoff captured. The
designer then applies the percentage of runoff captured to the contributing
area to calculate the capture-reuse area, which can be subtracted from the
total site area. Return to step 3 and complete Worksheet 3.
Flowchart A
Stormwater Calculation Process
Step 1: Complete
Worksheet 1
General Site Information
Step 2: Map Existing Conditions
and Sensitive Natural Resources
and complete Worksheet 2 to
determine credits for protecting
sensitive Natural Resources
Step 3: Determine Management
Area and complete Worksheet
3a; Determine applicable
Non-Structural BMPs and
complete Worksheet 3b
for Non-Structural BMP credits
Step 4: Estimate Net Increase
in Runoff Volume for Design
Storm (85th percentile storm,
net increase in 2-year storm, etc.)
(Complete Worksheet 4)
Step 5: Determine applicable
Structural BMPs and complete
Worksheet 5 for structural
BMP volume credits
Proceed to Flow
Chart B:
Peak Rate Mitigation
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