Peak Stormwater Runoff Calculation with the Rational Method

Title: Peak Stormwater Runoff Calculation with the Rational Method

Contributor: Harlan Bengtson Ph.D., P.E. , Former Dean of Engineering, Southern Illinois University Edwardsville

Published Date: 22-Aug-2014

Content Type: Spreadsheet

Description:

This set of worksheets facilitates the calculation of peak stormwater runoff rate, allowing comparison of several alternatives for calculating the watershed time of concentration, a key parameter in the overall calculation.

There are worksheets for calculating the following:

1. Watershed time of concentration based on user input information about the watershed.

2. Peak stormwater runoff rate using a design storm intensity calculated from user input rainfall intensity vs. duration data.

3. Peak stormwater runoff rate using a design storm intensity calculated with user input values for Steel Equation constants.