8,254
edits
Changes
Jump to navigation
Jump to search
Line 45:
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:
Line 59:
Infiltration: Sizing and modeling (view source)
Revision as of 02:11, 12 September 2017
, 7 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==