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| Image:Infiltration.png|thumb|700 px|This is an image map; clicking on components will load the appropriate article. | | Image:Infiltration.png|thumb|700 px|This is an image map; clicking on components will load the appropriate article. |
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| rect 238 266 397 329 [[Bioretention: Sizing]] | | rect 238 266 397 329 [[Bioretention: Sizing]] |
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| !style="background: darkcyan; color: white"|Parameter | | !style="background: darkcyan; color: white"|Parameter |
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− | |''D''||hrs||Duration of design storm (for MOECC volume based caclulations set to 1) | + | |''D''||hrs||Duration of design storm (for MOECC volume based calculations set to 1) |
| |- | | |- |
| |''i''||mm/hr||Intensity of design storm (for MOECC volume based calculations use whole storm depth (link to map)) | | |''i''||mm/hr||Intensity of design storm (for MOECC volume based calculations use whole storm depth (link to map)) |
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| 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]]. |
| 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}{K}</math> | + | <math>t=\frac{d}{K}</math> |
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| ==Drawdown time to empty facility== | | ==Drawdown time to empty facility== |
| [[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> |
− | From left to right x = 12 m, x = 14 m, and x = 16 m]] | + | From left to right x = 12 m, x = 20 m]] |
| The target [[drawdown time]] for the internal storage of an infiltration facility is between 48-72 hours. <br> | | The target [[drawdown time]] for the internal storage of an infiltration facility is between 48-72 hours. <br> |
| For some geometries (e.g. particularly deep facilities or linear facilities), it preferable to account for lateral infiltration. | | For some geometries (e.g. particularly deep facilities or linear facilities), it preferable to account for lateral infiltration. |