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Rainwater harvesting: Sizing and modeling (view source)
Revision as of 13:45, 17 August 2017
, 6 years agono edit summary
===Simple===
===Simple===
Five percent of the average annual yield can be estimated
Five percent of the average annual yield can be estimated
$$Y_{0.05} = A \times C_{vol, A}\times R_{a} \times e \times 0.05$$
$$Y_{0.05} = A \times C_{vol,A}\times R_{a} \times e \times 0.05$$
where:
where:
{{plainlist|
{{plainlist|
#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 :<math>0.33<Y_{0.05}/D_{0.05}<0.7</math>, the storage volume required can be estimated:
*When Y<sub>0.05</sub>/ D<sub>0.05</sub> < 0.33, the storage volume required can be estimated:
<math>V_{S} = A \times C_{vol,E}\times R_{d} \times e</math>
Where:
*V<sub>S</sub> = Storage volume required (L)
{{plainlist|
*A = The catchment area (m<sup>2</sup>)
*''V<sub>S</sub>'' = Storage volume required (L)
*C<sub>vol, E</sub> = The design storm runoff coefficient for the catchment
*''A'' = The catchment area (m<sup>2</sup>)
*R<sub>d</sub> = The design storm rainfall depth (mm), and
*''C<sub>vol,E</sub>'' = The design storm runoff coefficient for the catchment
*e = The efficiency of the pre-storage filter.}}}}
*''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.
*Careful catchment selection means that the runoff coefficient, for a rainstorm event (C<sub>vol, E</sub>) should be 0.9 or greater.