FREE STORMWATER CALCULATORS
stormwaterplanning.us/tools/

summary     Free stormwater tools: construction stormwater permit coverage check, Rational Method runoff calculator (Q = CiA) and sediment basin sizing calculator.

- https://stormwaterplanning.us/tools/stormwater-permit-check/  Do I Need a Construction Stormwater Permit or SWPPP? Quick Check
- https://stormwaterplanning.us/tools/rational-method-calculator/  Rational Method Calculator: Peak Stormwater Runoff (Q = CiA)
- https://stormwaterplanning.us/tools/sediment-basin-calculator/  Sediment Basin Sizing Calculator: EPA CGP Storage Requirements

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Free Calculators

Free Stormwater Calculators

Check whether a project likely needs construction stormwater permit coverage, estimate peak runoff with the Rational Method, and size a sediment basin. Everything runs in your browser.

  • 3 free calculators
  • No sign-up
Calculator

Do I Need a Construction Stormwater Permit or SWPPP? Quick Check

Enter acreage, location and role to see if a project likely needs permit coverage and a SWPPP.

 Calculator

Rational Method Calculator: Peak Stormwater Runoff (Q = CiA)

Weighted runoff coefficient and peak flow in cfs and gpm using Q = CiA.

 Calculator

Sediment Basin Sizing Calculator: EPA CGP Storage Requirements

Basin storage at 3,600 cf per acre or the 2-year, 24-hour runoff, with a rough footprint.

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QSP Practitioner and SWPPP Preparer courses aligned with the Clean Water Act, NPDES and the Construction General Permit. Certificate of completion. English & Spanish.

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