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Rainwater harvesting: Sizing and modeling (view source)
Revision as of 20:51, 26 June 2017
, 7 years ago→Rapid
<li>The runoff coefficient for the catchment (C<sub>vol</sub>)</li>
<li>The runoff coefficient for the catchment (C<sub>vol</sub>)</li>
<li>The average annual rainfall depth (R<sub>a</sub>, in mm)</li>
<li>The average annual rainfall depth (R<sub>a</sub>, in mm)</li>
<li> the efficiency of the pre-storage filter (η), and </li>
<li> the efficiency of the pre-storage filter (e), and </li>
<li> 0.05 </li></ul></p>
<li> 0.05 </li></ul></p>
<p>Five percent of the average annual demand (D<sub>0.05</sub>) is calculated as the product of:
<p>Five percent of the average annual demand (D<sub>0.05</sub>) is calculated as the product of:
<li>The design storm runoff coefficient for the catchment (C<sub>vol</sub>)</li>
<li>The design storm runoff coefficient for the catchment (C<sub>vol</sub>)</li>
<li>The design storm rainfall depth (R<sub>d</sub>, in mm), and </li>
<li>The design storm rainfall depth (R<sub>d</sub>, in mm), and </li>
<li> the efficiency of the pre-storage filter (η). </li></ul>
<li> the efficiency of the pre-storage filter (e). </li></ul>
Good catchment selection means that the runoff coefficient (C<sub>vol</sub>) should be 0.9 or greater.
Good catchment selection means that the runoff coefficient (C<sub>vol</sub>) should be 0.9 or greater.
Filter efficiency can be reasonably estimated as 0.9 pending manufacturer’s information.
Filter efficiency can be reasonably estimated as 0.9 pending manufacturer’s information.
<panelInfo>
<panelInfo>
<gallery mode="packed" widths=300px heights=300px>
<gallery mode="packed" widths=300px heights=300px>
RWH calcs.PNG
Cistern Size.png| Schematic diagram of the inputs and outputs to a rainwater harvesting cistern
Cistern Size.png| Schematic diagram of the inputs and outputs to a rainwater harvesting cistern
</gallery>
</gallery>