Runoff and Rainfall Intensity Calculator Spreadsheet

Runoff and Rainfall Intensity Calculator Spreadsheet

The first stage in most drainage design projects is to ascertain the quantity of water which will runoff into the drainage system in storm conditions. For simple or low risk projects, this can be calculated using the following equation;

Q = Runoff Flow (l/s)

A = Catchment Area (m²)

C = Runoff Coefficient

R = Rainfall Rate (mm/s)

 

Spreadsheet

This spreadsheet calculates the design runoff flow for a site in accordance with the Flood Estimation Handbook. It includes the following functions;

  • Calculates the design runoff flow for any site in the UK using actual rainfall data
  • Non UK users can specify a storm duration and intensity to calculate the design runoff
  • User can alter all parameters including;
  • Different surfacing conditions can be modelled by altering the runoff coefficient
  • Output
    • Gives a design runoff volume for the specified site and storm conditions
    • Plots a chart of runoff volume over return period allowing the designer to easily see how the return period affects the runoff volume

Download Free Trial Version

To try out a fully functional free trail version of this software, please enter your email address below.

Runoff Calculator Spreadsheet (Metric) - Single User License

£10.00

Runoff Calculator Spreadsheet (Imperial) - Single User License

£10.00

Runoff Calculator Spreadsheet (Metric) - Company License

£25.00

Runoff Calculator Spreadsheet (Imperial) - Company License

£25.00