How Rain Harvesting Works

Normally when it rains the rainwater pours off your roof, down through your gutters and it just runs off into your yard or street. Rainwater harvesting systems allow you to collect and store rainwater for later use.
Basic configuration of a Rainwater Harvesting System

The basic principal of Rainwater harvesting systems is to channel rainwater from a catchment surface (roof or other raised solid surface), through a distribution system (gutters, downspouts and pipes) and then into storage tank.

The storage tank can be above ground or underground and can be made from a variety of materials including plastic and metal. Water storage tanks should be covered to prevent mosquito breeding and to reduce evaporation losses, contamination and algal growth. Rainwater harvesting systems require regular maintenance and cleaning to keep the system hygienic.

Why Harvest Rainwater?

“Rainwater is a renewable, sustainable and a high quality water source for your home”
What is rainwater harvesting?

Rainwater harvesting is a technique used for collecting, storing, and using rainwater for landscape irrigation and other uses. Normally when it rains the rainwater pours off your roof, down through your gutters and runs off into your yard or street. With rainwater harvesting your rainwater is collected in a water storage tank or cistern and stored for later use.

The practice of collecting and storing rain water has been around for thousand of years and is currently growing in popularity throughout our communities due to interest in reducing the consumption of potable water and the inherent qualities of rainwater. It is appropriate for large scale landscapes such as parks, schools, commercial sites, parking lots, and apartment complexes, as well as small scale residential landscapes.
The benefits of harvesting rain water

Rainwater is a renewable, sustainable and a high quality water source for your home. Some of the benefits of collecting and storing rainwater include*:

Diminishing flooding, erosion and the flow to stormwater drain by reducing peak storm water runoff
Reducing water bills and demand on your community’s drinking water supply by using rainwater for flushing toilets, washing clothes, watering the garden and washing cars
Improving plant growth by using rainwater for irrigation because stored rainwater is free from pollutants as well as salts, minerals, and other natural and man-made contaminants
Making use of a valuable resource that is FREE

*As rainwater may be contaminated due to pollutants, it is often not considered suitable for drinking without treatment.

Rainwater Harvesting Calculator

Rainwater harvesting calculators are important for several reasons. They help to better balance the supply and demand so that a system can be sized correctly and so the user has adequate storage to get through long periods without rainfall.

We’ve included a downloadable calculator for your benefit. The first chart shows the average rainfall in Southern Arizona and how many gallons of rainwater per month that can be collected from a 1000sq. ft. home. As you can see, a 1000 sq ft. home collects an astounding average of 7800 gallons of water a year with rainwater harvesting. The second chart shows the amount of water your home can collect based on the amount of rainfall and square footage of your home. For example, a 2000 sq. ft. home collects about 1247 gallons of water with just 1″ of rainfall. How much water could you collect from your roof?

Download calculator

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