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Rainwater Harvest Runoff Reduction Calculator

Contech's Runoff Reduction Calculatorâ„¢ allows you to input supply and demand criteria easily determine the benefits of a rainwater harvesting system. 

All Online Design Tools are currently not available.

If you need assistance with your project please use the Look Up Tool above or the Contact Us form located here.

We apologize for any inconvenience this may cause.

Benefits include:

  • Runoff reduction and stormwater volume retained on-site
  • Water saving and reduction of demand on potable supplies
  • Optimal cistern size and cistern depth
  • Financial savings based on reduced utility fees
  • Information to support LEED credits

The tool includes local rainfall data and provides a detailed report including projected performance calculations that can be used for client meetings and stormwater permit approval.