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sci.stormwater-detention-time Calculator
Calculates stormwater detention basin volume and hydraulic detention time required to attenuate peak flow from a design storm. A basin storing the 100-year storm volume and releasing over 24 hours can reduce peak discharge by 50–80%.
Inputs
Basin Volume M3
Three-dimensional space occupied (m³ or L). 1 m³ = 1,000 L.
Average Inflow M3 S
Age in completed years. Many health and fitness formulas adjust for age.
Dead Volume Pct
Three-dimensional space occupied (m³ or L). 1 m³ = 1,000 L.
Results
hydraulic retention time HRT (hours)
The result expressed in hours. Divide by 24 to convert to days.
HRT (minutes)
Sample size or count used in the calculation.
effective volume (m³)
The computed three-dimensional volume.
overflow rate (m³/m²/d)
The value at the specified point or condition.
HRT = V_eff/Q
Reference formula or conversion factor shown for context.
required HRT
Reference formula or conversion factor shown for context.