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Rainwater harvesting: Sizing and modeling (view source)
Revision as of 13:54, 17 August 2017
, 7 years agono edit summary
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\*Careful catchment selection means that the runoff coefficient, for a rainstorm event (C<sub>vol, E</sub>) should be 0.9 or greater.
*''e'' = The efficiency of the pre-storage filter.}}
*''e'' = The efficiency of the pre-storage filter.}}
*Careful catchment selection means that the runoff coefficient, for a rainstorm event (C<sub>vol, E</sub>) should be 0.9 or greater.
When \(0.33<Y_{0.05}/D_{0.05}<0.7\), the total storage required can be estimated by adding Y<sub>0.05</sub>:
When \(0.33<Y_{0.05}/D_{0.05}<0.7\), the total storage required can be estimated by adding Y<sub>0.05</sub>:
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[[File:TTT.png|400 px|link=http://www.sustainabletechnologies.ca/wp/low-impact-development-treatment-train-tool/]]
[[File:TTT.png|400 px|link=http://www.sustainabletechnologies.ca/wp/low-impact-development-treatment-train-tool/]]
Once the size of cistern has been determined, it can easily be modeled in many open source and proprietary applications. For planning purposes, a RWH system could be integrated into a site plan using STEP's Treatment Train Tool.
Once the size of cistern has been determined, it can easily be modeled in many open source and proprietary applications. For planning purposes, a RWH system could be integrated into a site plan using STEP's Treatment Train Tool. This tool provides a graphical user interface and simplified inputs on the EPA SWMM model. It is free to download.
In a typical configuration:
In a typical configuration:
*The catchment (roof) would be 100% impervious
*The catchment (roof) would be 100% impervious