Rainwater Harvesting – Calculating

Rainwater Harvesting Calculators are based on:

  • Size of roof
  • Amount in storage
  • Daily / Monthly Demand (Inside & Outside)

Rainwater Supply & Demand

In order to calculate the amount of rainwater that can be stored you have to evaluate local data on rainfall such as the monthly and yearly average rainfall for a region.

A fantastic resource for calculating rainwater can be found at Texas A&M’s website: http://rainwaterharvesting.tamu.edu/ 

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