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Line 45: − − ==To calculate the require facility area or footprint where the depth is constrained (1D)== − <math>P=\frac{IiD}{nd+qD}</math> − − ==Infiltration of surface ponding time== − 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]]. − To calculate the time (''t'') to fully drain the facility through the footprint area only: − <math>t=\frac{nd}{K}</math> − Line 69:
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Infiltration: Sizing and modeling (view source)
Revision as of 22:11, 11 September 2017
, 8 years agono edit summary
==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 (1D)==
<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>
==To calculate required depth (3D)==
==To calculate required depth (3D)==
[[file:Hydraulic radius.png|thumb|Three footprint areas of 9 m<sup>2</sup>.<br>
[[file:Hydraulic radius.png|thumb|Three footprint areas of 9 m<sup>2</sup>.<br>
(The rearrangement to calculate the required footprint area of the facility for a given depth is not available at this time. Elegant submissions are invited.)
(The rearrangement to calculate the required footprint area of the facility for a given depth is not available at this time. Elegant submissions are invited.)
==To calculate the require facility area or footprint where the depth is constrained (1D)==
<math>P=\frac{IiD}{nd+qD}</math>
==Infiltration of surface ponding time==
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]].
To calculate the time (''t'') to fully drain the facility through the footprint area only:
<math>t=\frac{nd}{K}</math>
==Drawdown time==
==Drawdown time==