Rainwater Catchment

WHAT IS RAINWATER HARVESTING?

The collection and storage of rainwater from roof surfaces in on-site tanks for later use.  This water is then filtered using a system appropriate for the intended use.  Options include:

  • Garden or landscape
  • Grey water (toilets, laundry, etc.)
  • Potable water (drinking water)

WHAT ARE THE BENEFITS?

  • Reduce reliance on municipal, neighborhood or well water systems
  • Reduce water bills
  • Decrease storm water runoff

WHAT ABOUT DIRTY ROOFS?

 

A 'first flush device' can be used to filter roof debris from rainwater prior to entering primary storage tank.

SIZING RAINWATER SYSTEMS

How much rainwater can I collect?

Water consumption can vary widely due to different factors such as water usage for washing or bathing. This calculator will help you gauge how much water you can collect off your roof, and is not an indication of how much water you will use.

Click Here to Calculate your water footprint.

Annual Rainwater Volume Calculator

  1. Determine Roof Area, using plan footprint not sloped area. Example: W x L = Footprint (add any overhangs to this figure)
  2. Determine Annual Rainfall
  3. Determine Collection Potential, Annual Rainfall ( in.) x Roof Area (in ft2) = Gallons collected annually.

RAINWATER HARVESTING REGUALTIONS

US Office of Energy Efficiency and Renewable Energy - Rainwater Harvesting Regulations

"Rainwater collection is currently regulated by individual states.  There was no centralized information on state-level regulations on rainwater harvesting maintained by a federal agency.  To fill this information gap, the Federal Energy Management Program compiled state-level information and provided it in this map tool."  See link above.

National Conference of State Legislators - State Rainwater Harvesting Laws and Legislation

Washington State Department of Ecology - Rainwater Collection

Seattle Public Utilities - Rainwater Harvesting

American Rainwater Catchment Systems Association

RAINWATER SYSTEM DESIGN & PRODUCTS

RainHarvest Systems offer the largest collection of rainwater harvesting products in the world.