Line 3: |
Line 3: |
|
| |
|
| ===Rapid=== | | ===Rapid=== |
| <p>Five percent of the average annual yield (Y<sub>0.05</sub>, in L) is calculated as the product of: | | <p>Five percent of the average annual yield can be calculated using the following equation:<br> |
| <ul><li>The catchment area (A, in m<sup>2</sup>)</li> | | <strong>Y<sub>0.05</sub>= A × C<sub>vol</sub> × R<sub>a</sub> × e × 0.05</strong> |
| <li>The runoff coefficient for the catchment (C<sub>vol</sub>)</li> | | <ul> |
| <li>The average annual rainfall depth (R<sub>a</sub>, in mm)</li> | | <li>Y<sub>0.05</sub> = Five percent of the average annual yield (L) |
| <li> the efficiency of the pre-storage filter (e), and </li> | | <li>A = The catchment area ( m<sup>2</sup>)</li> |
| <li> 0.05 </li></ul></p>
| | <li>C<sub>vol</sub> = The runoff coefficient for the catchment</li> |
| <p>Five percent of the average annual demand (D<sub>0.05</sub>) is calculated as the product of: | | <li>R<sub>a</sub> = The average annual rainfall depth (mm)</li> |
| <ul><li> The daily demand per person (P<sub>d</sub>, in L)</li> | | <li>e = The efficiency of the pre-storage filter</li> |
| <li> The number of occupants (n)</li> | | </ul> |
| <li> 365, and </li> | | </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:<br> |
| | <strong>D<sub>0.05</sub> = P<sub>d</sub> × n × 18.25</strong> |
| | <ul> |
| | <li>D<sub>0.05</sub> = Five percent of the average annual demand (L)</li> |
| | <li>P<sub>d</sub> = The daily demand per person (L)</li> |
| | <li>n = The number of occupants</li> |
| | </ul> |
| | 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.</p> |
| | ---- |
| <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>The average annual demand (D) is greater than the average annual yield (Y) from the catchment. </li></ol></p> | | <li>A design rainfall depth is to be captured entirely by the RWH system.</li> |
| <p><strong>When Y<sub>0.05</sub>/ D<sub>0.05</sub> <0.33</strong> <br> | | <li>The average annual demand (D) is greater than the average annual yield (Y) from the catchment. </li> |
| The total storage volume required (V<sub>S</sub>, in L) is calculated as the product of: | | </ol> |
| <ul> | | </p> |
| <li>The catchment area (A, in m<sup>2</sup>)</li> | | <p><strong>When Y<sub>0.05</sub>/ D<sub>0.05</sub> <0.33</strong> |
| <li>The design storm runoff coefficient for the catchment (C<sub>vol</sub>)</li> | | <br> The total storage volume required (V<sub>S</sub>, in L) is calculated as the product of: |
| <li>The design storm rainfall depth (R<sub>d</sub>, in mm), and </li> | | <ul> |
| <li> the efficiency of the pre-storage filter (e). </li></ul> | | <li>The catchment area (A, in m<sup>2</sup>)</li> |
| Good catchment selection means that the runoff coefficient (C<sub>vol</sub>) should be 0.9 or greater.
| | <li>The design storm runoff coefficient for the catchment (C<sub>vol</sub>)</li> |
| Filter efficiency can be reasonably estimated as 0.9 pending manufacturer’s information.
| | <li>The design storm rainfall depth (R<sub>d</sub>, in mm), and </li> |
| | <li> the efficiency of the pre-storage filter (e). </li> |
| | </ul> |
| | |
| </p> | | </p> |
| <p><strong>When 0.33 < Y<sub>0.05</sub>/ D<sub>0.05</sub> <0.7</strong> <br> | | <p><strong>When 0.33 < Y<sub>0.05</sub>/ D<sub>0.05</sub> <0.7</strong> |
| The total storage required is the sum of V<sub>S</sub> and Y<sub>0.05</sub>. </p> | | <br> The total storage required is the sum of V<sub>S</sub> and Y<sub>0.05</sub>. </p> |
|
| |
|
| </div> | | </div> |
Line 37: |
Line 48: |
| </gallery> | | </gallery> |
| </panelInfo> | | </panelInfo> |
| <PanelSuccess>
| |
| <gallery mode="packed" widths=300px heights=300px>
| |
| RWH calcs.PNG
| |
| </gallery>
| |
| </PanelSuccess>
| |
| </div> | | </div> |
| <div class="col-md-12"> | | <div class="col-md-12"> |