Rain Harvesting System

By Robert Robillard on Energy Saving

rain harvestingHarvesting Rainwater

Rainwater harvesting is the accumulating and storing, of rainwater.   This is not a new idea and has been used for years in many areas of the country and world.   Rainwater is typically harvested and stored in a cistern or storage tank and later used for drinking water, water for livestock or irrigation.

Rainwater collected from the roofs of houses into gutters and then to a storage tank.   This system can make an important contribution to the availability of drinking water.   As water conservation is becoming more and more popular, more people have begun to make their rainwater collection system and do it as a DIY installation.  Systems can be both simple and complex.

Some companies such as www.braewater.com provide a complete system for you to install on your own or through a contractor.   A buried or hidden 1700 gallon storage tank receives and stores rainwater from the homes gutter system and can be pumped to areas needed.

A Rain Harvesting System Consists Of:

  • Tank:    A Modular tank or a one piece 1700 gallon tank.
  • Pump:   A 1/2 horse power submersible  pump, with a shut off to prevent it from running when dry.
  • Filter:   The downspouts have a basket filter to capture debris.   Other filters would be needed for potable water.

How much rain can I collect?

A typical house with 2,000 sq. ft. of roof area in NC can average 60,000 gallons annually. To find out how much you could collect, use the equation below.

Collection Potential = CA(Rainfall)(0.6*)


Your Collection Area is expressed in square feet, for example 10 × 20 ft. Collection Area = 200 SF (square feet). Your Collection Area is the footprint of your house or building independent of the roof pitch or shape. One inch of rain on one square foot of Collection Area equals 0.623 (0.6*) gallons of rainwater. For example, 1 inch of rain on 1,000 square feet of Collection Area yields 600 gallons of collectible rainwater.


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About the author

Robert Robillard

Carpenter / Remodeler / Editor

Rob Robillard is “The Concord Carpenter” Rob is a builder, general contractor, carpenter, woodworker, and editor of Concord Carpenter and ToolBoxBuzz As a General Contractor and carpenter, Rob owns and operates Concord Carpenter LLC. A full-service remodeling and construction company. Rob is a recognized leader in home building best practices and a source for how-to information for building professionals. On this website, Rob covers all aspects of home construction, building science, home improvement, woodworking, remodeling, and some of the best product and tool reviews. Rob is in charge of our Tool and Product Review series - Concord Carpenter Videos where we post all of our tool reviews and video tutorials. Rob approaches remodeling and building construction with a pragmatic and problem-solving approach. He enjoys using his knowledge and experience to help and educate building professionals as well as DIYers on best practices in the construction and remodeling industry. He's a strong advocate for "raising the bar" in the construction trades and promoting the trades to youth. #BeAMentor #Green2Great Craftsmanship, quality, and pride guide his journey on this channel The Concord Carpenter's motto: "Well done is better than well said!" : Read more about Rob

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