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Before you begin you will need to know the following;<br>
Before you begin you will need to know the following;<br>
* Catchment area (i.e. contributing drainage area), A<sub>c</sub> (m<sup>2)
* Catchment area (i.e. contributing drainage area), A<sub>c</sub> (m<sup>2</sup>)
* Catchment runoff coefficient, C
* Catchment runoff coefficient, C
* Catchment impervious area, A<sub>i</sub> (m<sup>2)
* Catchment impervious area, A<sub>i</sub> (m<sup>2)
* Design storm intensity, i (mm/h)
* Design storm intensity, i (mm/h)
* Design storm duration, D (h)
* Design storm duration, D (h)
* Infiltration target for design storm event, I<sub>d</sub> (mm)
* Infiltration volume target for the design storm event, V<sub>i</sub> (m<sup>3</sup>), based on average annual water budgets for the catchment for pre- and post-development scenarios and the infiltration volume deficit (pre-development minus post-development infiltration)
* Drainage time t (h) to fully drain the active storage of the practice, based on provincial or municipal criteria or average inter-event period for the location
* Drainage time t (h) to fully drain the active storage of the practice, based on provincial or municipal criteria or average inter-event period for the location
* Field infiltration rate of the underlying native soil f<sub>f</sub> (mm/h), median of field measurements or based on interpolation from median grain-size distribution results
* Field infiltration rate of the underlying native soil f<sub>f</sub> (mm/h), median of field measurements or based on interpolation from median grain-size distribution results