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

With the Runoff Reduction Calculator, you can calculate:
  • 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. Click here to see a sample report.