INPUT:

Selected units: SI units

Catchment area A :   30 ha

Storm depth P :   85 mm

Storm type:   Type II / Type III

Pre-development peak flow Qo :   5 m3/s

Post-development peak flow Qi :   10 m3/s


OUTPUT:

Selected storm type:   Type II / Type III

Runoff volume Vr =   25500 m3

Ratio Qo / Qi = 0.5

Ratio Vs / Vr = 0.277

Detention basin storage volume Vs =   7063.5 m3