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With minimal pretreatment (e.g., gravity filtration or first-flush diversion), the captured rainwater can be used for outdoor non-potable water uses such as irrigation and pressure washing, or in the building to flush toilets or urinals. It is estimated that these applications alone can reduce household municipal water consumption by up to 55% ( Reid Homes, 2007). The capture and use of rainwater can, in turn, significantly reduce stormwater runoff volume and pollutant load. By providing a reliable and renewable source of water to end users, rainwater harvesting systems can also help reduce demand on water resources (such as groundwater aquifers and reservoirs) from which municipal water supplies are drawn. By reducing demand on water resources, rainwater harvesting can result in significant cost savings due to:

Rainwater harvesting reduces the volume of water that enters the municipal storm sewer system during wet weather, which frees up capacity for conveyance, storage and treatment in downstream stormwater infrastructure. It also conserves treated drinking water which provides cost savings to municipalities through reduced demand for municipally-supplied water and to property owners through lower water bills.

Rainwater is a better water source for irrigating vegetable gardens and landscaping because it does not contain residual chlorine and disinfection by-products found in municipally supplied drinking water. To maximize the runoff reduction and water conservation benefits it is best to substantially or fully drain rain barrels and cisterns between storms. </HalfLeft>

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<panelinfo> <panelHeading>RAINWATER HARVESTING</panelHeading> <panelBody>450px-RainBarrel.jpg</panelBody>

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<panelsuccess> <panelHeading>RAINWATER HARVESTING</panelHeading> <panelBody>Rainwater harvesting is the ancient practice of collecting and storing rainwater for later use. Roof runoff is directed into a rain barrel Figure 1 or underground storage tank (i.e. cistern) via downspouts from eavestroughs or roof drains and used for purposes not requiring potable water (e.g. garden irrigation, outdoor/vehicle washing, toilet flushing, fire suppression).</panelBody>

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<paneldanger> <panelHeading>RAINWATER HARVESTING</panelHeading> <panelBody>Rainwater harvesting reduces the volume of water that enters the municipal storm sewer system during wet weather, which frees up capacity for conveyance, storage and treatment in downstream stormwater infrastructure. It also conserves treated drinking water which provides cost savings to municipalities through reduced demand for municipally-supplied water and to property owners through lower water bills.</panelBody>

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<panelwarning> <panelHeading>RAINWATER HARVESTING</panelHeading> <panelBody>Rainwater is a better water source for irrigating vegetable gardens and landscaping because it does not contain residual chlorine and disinfection by-products found in municipally supplied drinking water. To maximize the runoff reduction and water conservation benefits it is best to substantially or fully drain rain barrels and cisterns between storms.</panelBody></panelwarning>

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References

Reids Heritage Homes. 2007. Leeds Home Showcased Features. http://www.ReidsHeritageHomes.com