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Rainwater harvesting: Sizing and modeling (view source)
Revision as of 01:07, 12 August 2017
, 7 years ago→Simple
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<br><strong>V<sub>S</sub> = A × C<sub>vol</sub> × R<sub>d</sub> × e</strong><br>V<sub>S</sub> = Storage volume required (L)<br>A = The catchment area (m<sup>2</sup>)<br>C<sub>vol, E</sub> = The design storm runoff coefficient for the catchment<br>R<sub>d</sub> = The design storm rainfall depth (mm), and<br>e = The efficiency of the pre-storage filter.
#A design rainfall depth is to be captured entirely by the RWH system.
#A design rainfall depth is to be captured entirely by the RWH system.
#The average annual demand (D) is greater than the average annual yield (Y) from the catchment.
#The average annual demand (D) is greater than the average annual yield (Y) from the catchment.
When Y<sub>0.05</sub>/ D<sub>0.05</sub> < 0.33, the storage volume required can be estimated:
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*When Y<sub>0.05</sub>/ D<sub>0.05</sub> < 0.33, the storage volume required can be estimated:
*<strong>V<sub>S</sub> = A × C<sub>vol</sub> × R<sub>d</sub> × e</strong>
*V<sub>S</sub> = Storage volume required (L)
*A = The catchment area (m<sup>2</sup>)
*C<sub>vol, E</sub> = The design storm runoff coefficient for the catchment
/*Good catchment selection means that the runoff coefficient, for a rainstorm event (C<sub>vol, E</sub>) should be 0.9 or greater.
*R<sub>d</sub> = The design storm rainfall depth (mm), and
*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<sub>0.05</sub>/ D<sub>0.05</sub>< 0.7, the total storage required can be estimated by adding Y<sub>0.05</sub>:
When 0.33 < Y<sub>0.05</sub>/ D<sub>0.05</sub>< 0.7, the total storage required can be estimated by adding Y<sub>0.05</sub>: