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Rainwater harvesting: Sizing and modeling (view source)
Revision as of 20:32, 26 June 2017
, 6 years ago→Rapid
<li> the efficiency of the pre-storage filter (η), and </li>
<li> the efficiency of the pre-storage filter (η), and </li>
<li> 0.05 </li></ul></p>
<li> 0.05 </li></ul></p>
<p>Five percent of the average annual demand (D<sub>N</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:
<ul><li> The daily demand per person (P<sub>d</sub>, in L)</li>
<ul><li> The daily demand per person (P<sub>d</sub>, in L)</li>
<li> The number of occupants (n), and </li>
<li> The number of occupants (n), and </li>
<p>The following calculation is based upon two criteria:
<p>The following calculation is based upon two criteria:
<ol><li>A design rainfall depth is to be captured entirely by the RWH system.</li>
<ol><li>A design rainfall depth is to be captured entirely by the RWH system.</li>
<li>The average annual demand (D<sub>N</sub>) is greater than the average annual yield (Y<sub>R</sub>) coming from the catchment. </li></ol></p>
<li>The average annual demand (D<sub>0.05</sub>) is greater than the average annual yield (Y<sub>0.05</sub>) coming from the catchment. </li></ol></p>
<p>When Y<sub>R</sub>/ D<sub>N</sub> <0.33 <br>
<p>When Y<sub>0.05</sub>/ D<sub>0.05</sub> <0.33 <br>
The total storage volume required (V<sub>S</sub>, in L) is calculated as the product of:
The total storage volume required (V<sub>S</sub>, in L) is calculated as the product of:
<ul>
<ul>
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.
</p>
</p>
<p>When 0.33 < Y<sub>R</sub>/ D<sub>N</sub> <0.7 <br>
<p>When 0.33 < Y<sub>0.05</sub>/ D<sub>0.05</sub> <0.7 <br>
The total storage required is the sum of V<sub>S</sub> and Y<sub>R</sub>.
The total storage required is the sum of V<sub>S</sub> and Y<sub>0.05</sub>. </p>