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→Design Considerations
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==Design Considerations==
−{{:Safety correction factors}}
−===Example===
−Where the mean infiltration rate measured at the proposed bottom elevation of the BMP is 30 mm/hr, and the mean infiltration rate measured in an underlying soil horizon within 1.5 m of the bottom is 12 mm/h:
−:<math>ratio=\frac{q_{bottom}}{min\ q_{within 1.5m}}\ =\ \frac{30}{12}\ =2.5</math>
−From the table the SCF is 3.5, and the design infiltration rate can be calculated:
−:<math>q'=\frac{q}{SCF}\ =\ \frac{30}{3.5}=\ 8.6\ mm/hr</math>
*In sandy soils, where half the depth of water percolates within 30 minutes. Otherwise, calculate the infiltration rate
*In sandy soils, where half the depth of water percolates within 30 minutes. Otherwise, calculate the infiltration rate
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[[category:Infiltration]]
[[category:Infiltration]]