m |
m |
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*(Recharge Volume (V<sub>re</sub>) - High<sup>1</sup> | *(Recharge Volume (V<sub>re</sub>) - High<sup>1</sup> | ||
− | <font size=1><sup>1</sup>Assumes water is drained to a vegetated pervious area. | + | <font size=1><sup>1</sup>Assumes water is drained to a vegetated pervious area. does not apply to volume of runoff that bypasses the system.</font size> |
==Mechanisms== | ==Mechanisms== | ||
*Infiltration<sup>1</sup> | *Infiltration<sup>1</sup> | ||
Line 37: | Line 37: | ||
<font size=1><sup>1</sup>Assumes water is drained to a vegetated pervious area. does not apply to volume of runoff that bypasses the system.</font size> | <font size=1><sup>1</sup>Assumes water is drained to a vegetated pervious area. does not apply to volume of runoff that bypasses the system.</font size> | ||
+ | |||
==Site factors== | ==Site factors== | ||
*Drainage Area - Rooftop | *Drainage Area - Rooftop | ||
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*Poor Freeze/ Thaw Suitability - NA | *Poor Freeze/ Thaw Suitability - NA | ||
*Potential Hotspot Runoff - Suitable | *Potential Hotspot Runoff - Suitable | ||
− | < | + | <font size=1><sup>1</sup>Assuming water is drained to a vegetated pervious area. Does not apply to volume of runoff that bypasses the system</font size> |
==Benefits== | ==Benefits== |
Rain water harvesting is the practice of collecting rain water from impermeable surfaces, such as rooftops, and storing for future use. There are a number of systems used for the collection, storage and distribution of rain water including rain barrels, cisterns, evaporative control systems, and irrigation.
1Assumes water is drained to a vegetated pervious area. does not apply to volume of runoff that bypasses the system.
1Assumes water is drained to a vegetated pervious area. does not apply to volume of runoff that bypasses the system.
1Assumes water is drained to a vegetated pervious area. does not apply to volume of runoff that bypasses the system.
1Assuming water is drained to a vegetated pervious area. Does not apply to volume of runoff that bypasses the system
Rain water harvesting can be accomplished using rain barrels and/or cisterns. Rain barrels are typically located at the downspout of a gutter system and are used to collect and store rainwater for watering landscapes and gardens.
The simplest method of delivering water is by the force of gravity. However, more complex systems can be designed to deliver the water from multiple barrels connected in a series with pumps and flow control devices.
Cisterns have a greater storage capacity than rain barrels and may be located above or below ground. Due to their size and storage capacity, these systems are typically used to irrigate landscapes and gardens on a regular basis reducing the strain on municipal water supplies during peak summer months. Again, cisterns may be used in series and water is typically delivered using a pump system.
The storage capacity of a rain barrel or cistern is a function of the catchment area, the depth of rainfall required to fill the system and the water losses. A general rule of thumb in sizing rain barrels or cisterns is that one inch of rainfall on a 1,000 square foot roof will yield approximately 600 gallons of runoff.