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| {{Clickable button|[[Media:Infiltration Sizing.xlsx|Download .xlsx calculation tool]]}} | | {{Clickable button|[[Media:Infiltration Sizing.xlsx|Download .xlsx calculation tool]]}} |
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− | ==One dimensional infiltration== | + | ==To calculate the required depth, where the area of the facility is constrained (1D)== |
− | To calculate the required depth, where the area of the facility is constrained: | |
| <math>d=\frac{D\left[\left( \frac{I}{P} \right )i-q \right]}{n}</math> | | <math>d=\frac{D\left[\left( \frac{I}{P} \right )i-q \right]}{n}</math> |
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− | To calculate the require facility area or footprint where the depth is constrained: | + | ==To calculate the require facility area or footprint where the depth is constrained (1D)== |
| <math>P=\frac{IiD}{nd+qD}</math> | | <math>P=\frac{IiD}{nd+qD}</math> |
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− | <h3>Drawdown time</h3>
| + | ==Infiltration of surface ponding time== |
| The following equation assumes that infiltration occurs primarily through the footprint of the facility. | | The following equation assumes that infiltration occurs primarily through the footprint of the facility. |
− | It is best applied to calculate the limited duration ponding on the surface of [[bioretention cells]], [[bioswales]] and [[enhanced grass swales]]. | + | It is best applied to calculate the limited duration ponding on the surface of [[bioretention cells]], [[bioswales]] and [[enhanced grass swales]]. |
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| To calculate the time (''t'') to fully drain the facility through the footprint area only: | | To calculate the time (''t'') to fully drain the facility through the footprint area only: |
− | <math>t=\frac{nd}{q}</math> | + | <math>t=\frac{nd}{K}</math> |
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| ==Three dimensional infiltration== | | ==Three dimensional infiltration== |