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Bioretention: Sizing
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Revision as of 18:43, 2 April 2018
28 bytes added
,
6 years ago
m
→Calculate the maximum overall depth
Line 50:
Line 50:
*Step 2: Select an underdrain pipe diameter (typically 100 - 200 mm), assign this as an 'embedding' depth.
*Step 2: Select an underdrain pipe diameter (typically 100 - 200 mm), assign this as an 'embedding' depth.
*Step 3: Calculate the maximum possible storage reservoir depth beneath the pipe (''d<sub>s</sub>''):
*Step 3: Calculate the maximum possible storage reservoir depth beneath the pipe (''d<sub>s</sub>''):
−
<math>d_{s}=f'\
times38
.4</math>
+
<math>d_{s}=
\frac{
f'\
times 96}{0
.4
}
</math>
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*''f''' = Design infiltration rate in mm/hr, and
*''f''' = Design infiltration rate in mm/hr, and
−
*
38.4 comes from multiplying
desired drainage time
of 96
hours
by
void ratio of
0.4
}}
+
*
96 is the
desired drainage time
in
hours
+
*0.4 is the
void ratio of
[[reservoir gravel|clear stone]]
}}
===Additional step for system without underdrain===
===Additional step for system without underdrain===
Jenny Hill
8,255
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