| The initial design of a soakaway may show that its outflow,
combined with its storage, is in balance with its inflow and,
therefore, works for the chosen design rainfall.
However, the soakaway must be capable of discharging from
full to half-volume within 24 hours (default value) in readiness
for a subsequent storm inflow of similar proportions.
The following calculation is incorporated within Soakaway
Design to check the design
Half empty = ((Storage Volume) x 0.5) / (As50 x Soil Infiltration
Rate) seconds
Where,
As50 = internal surface area of soakaway through which
exfiltration can occur.
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Visual Soakaway Design - Help