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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. 

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.