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− | <table class="infobox" style="text-align: right; width: | + | <table class="infobox" style="text-align: right; width: 300px; font-size: 100%"> |
<tr> | <tr> | ||
− | <th>Quick Guide for pretreatment sizing</th> | + | <th><center>Quick Guide for pretreatment sizing of basins</center></th> |
</tr> | </tr> | ||
<tr> | <tr> | ||
<td> | <td> | ||
− | *Determine the particle size targeted (recommend 80 microns) | + | *Determine, ''v''<sub>''S''</sub>, the settling velocity for the particle size targeted (recommend 80 microns for particle size. Determine v<sub>s</sub> from table on this page) |
− | *Determine the target percent removal (recommend 50-70%) | + | *Determine ''FR'', the target percent removal (recommend 50-70%) |
+ | *Determine ''A'', the area of directly connected impervious draining to the pretreatment practice | ||
+ | *Determine ''I'', the peak rain intensity (0.5 in/hr for a 1-inch event, Type 2 distribution) | ||
+ | *Calculate the area of the pretreatment basin from A<sub>S</sub> = (FR * I * A * FR) / (v<sub>S</sub> * (1 - FR)) | ||
+ | *Determine the basin depth as the lesser of sqrt(A<sub>S</sub>) or 6 feet | ||
</td> | </td> | ||
</tr> | </tr> |
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Stormwater and soil, engineered (bioretention) media, and media amendments
Soil and engineered media, often referred to as bioretention media, are fundamental design characteristics of most post-construction stormwater practices. In some applications, soil or media amendments are utilized to improve soil conditions or enhance treatment effectiveness of a BMP.
This page provides links to pages that address topics related to soil, engineered media, and soil/media amendments.