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| __NOTOC__ | | __NOTOC__ |
| + | <imagemap> |
| + | Image:Infiltration.png|thumb|700 px|This is an image map; clicking on components will load the appropriate article. |
| + | poly 315 507 208 555 317 605 423 555 [[Drainage time]] |
| + | rect 210 658 426 730 [[Details]] |
| + | rect 568 522 728 594 [[Underdrain]] |
| + | poly 73 27 39 75 75 126 179 126 215 78 181 27 [[Infiltration]] |
| + | poly 268 25 235 75 270 123 364 124 395 76 365 25 [[Infiltration: Testing]] |
| + | rect 237 185 397 225 [[Select BMP type]] |
| + | rect 238 266 397 329 [[Bioretention: Sizing]] |
| + | </imagemap> |
| {{textbox| | | {{textbox| |
| {{plainlist| | | {{plainlist| |
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| #The minimum total depth may be limited by the need to support vegetation i.e. not < 0.6 m. | | #The minimum total depth may be limited by the need to support vegetation i.e. not < 0.6 m. |
| #[[Green roofs]], [[absorbent landscapes]] and [[permeable paving]] often receive very little flow from other surfaces, so that the I/P ratio is close to 1. | | #[[Green roofs]], [[absorbent landscapes]] and [[permeable paving]] often receive very little flow from other surfaces, so that the I/P ratio is close to 1. |
− | #[[Infiltration trenches]], [[Infiltration chambers| chambers]] and [[bioretention cells]] have a maximum recommended I/P ratio of 20. | + | #[[Infiltration trenches]], [[Infiltration chambers| chambers]] and [[bioretention]] have a maximum recommended I/P ratio of 20. |
| | | |
| {|class="wikitable" | | {|class="wikitable" |
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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> |
| | | |
| ==Drawdown time to empty facility== | | ==Drawdown time to empty facility== |