Quick Answer
Utilize rainwater collected in a cistern for irrigation, toilet flushing, and washing machines to minimize potable water consumption. Consider using a first flush device to prevent debris and contaminants from entering the cistern. Ensure adequate cistern sizing to meet household demands.
Cistern Sizing and Water Budgeting
When calculating cistern size, consider the roof catchment area, rainfall intensity, and household water demands. A general rule of thumb is to size the cistern at 1-2 gallons per square foot of roof catchment area. For example, a 1,000 square foot roof may require a 1,000 to 2,000 gallon cistern. Water budgeting involves determining the amount of water used for non-potable purposes, such as irrigation and toilet flushing, to ensure the cistern can supply enough water to meet these demands.
Rainwater Harvesting System Components
A typical rainwater harvesting system consists of a roof catchment, first flush device, cistern, and distribution system. The first flush device is used to divert the initial flow of water from the roof, which may contain contaminants, and allow clean water to enter the cistern. The distribution system, which includes pipes and valves, delivers the harvested water to the desired locations, such as irrigation systems, toilets, and washing machines.
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