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Infiltration: Sizing and modeling (view source)
Revision as of 03:34, 18 November 2019
, 4 years agono edit summary
__NOTOC__
__NOTOC__
<imagemap>
<imagemap>
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.
rect 238 266 397 329 [[Bioretention: Sizing]]
rect 238 266 397 329 [[Bioretention: Sizing]]
</imagemap>
</imagemap>
{{textbox|
{{textbox|
{{plainlist|
{{plainlist|
!style="background: darkcyan; color: white"|Parameter
!style="background: darkcyan; color: white"|Parameter
|-
|-
|''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))
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==
[[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.