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Bioretention: Sizing
(view source)
Revision as of 20:31, 2 April 2018
16 bytes added
,
6 years ago
m
→Drainage time (3D)
Line 86:
Line 86:
*Begin the drainage time calculation by dividing the area of the practice (''A<sub>p</sub>'') by the perimeter (''P'').
*Begin the drainage time calculation by dividing the area of the practice (''A<sub>p</sub>'') by the perimeter (''P'').
*To estimate the time (''t'') to fully drain the facility:
*To estimate the time (''t'') to fully drain the facility:
−
:<math>t=\frac{V_{R}A_{p}}{f'P}ln\left [ \frac{\left (
d
+ \frac{A_{p}}{P} \right )}{\left(\frac{A_{p}}{P}\right)}\right]</math>
+
:<math>t=\frac{V_{R}A_{p}}{f'P}ln\left [ \frac{\left (
d_{T}
+ \frac{A_{p}}{P} \right )}{\left(\frac{A_{p}}{P}\right)}\right]</math>
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*''V<sub>R</sub>'' is the void ratio of the media,
*''V<sub>R</sub>'' is the void ratio of the media,
Line 92:
Line 92:
*''f''' is the design infiltration rate (mm/hr),
*''f''' is the design infiltration rate (mm/hr),
*''P'' is the perimeter of the practice (m), and
*''P'' is the perimeter of the practice (m), and
−
*''d'' is the total depth of the practice, including the ponding zone (m).}}
+
*''d
<sub>T</sub>
'' is the total depth of the practice, including the ponding zone (m).}}
===Groundwater mounding===
===Groundwater mounding===
Jenny Hill
8,255
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