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mLine 65:
Line 65: − ==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>
→Design Considerations
*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]]