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Line 35:
Line 35: + − the ratio would be 2.5, the safety correction factor would be 3.5, and the design infiltration rate would be 8.6 mm/h. Where the soil horizon is continuous within 1.5 metres below the proposed bottom of the BMP, the mean infiltration rate measured at the bottom elevation of the BMP should be divided by a safety correction factor of 2.5 to calculate the design infiltration rate.+
→Example
:<math>ratio=\frac{q_{bottom}}{min\ q_{within 1.5m}}\ =\ \frac{30}{12}\ =2.5</math>
:<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:
would be 8.6 mm/h. Where the soil horizon is continuous within 1.5 metres below the proposed bottom of the BMP, the mean infiltration rate measured at the bottom elevation of the BMP should be divided by a safety correction factor of 2.5 to calculate the design infiltration rate.