Translations:Versickerung und Retention/68/en

V_erf = L x b x h x s_RR = (∑Q_zu - ∑Q_s) x D x 60 (3.)

Verf	= required storage volume in m³
D	= Rain duration in min

Infiltration: If only formulas 1. and 2.a are used for formula 3 to calculate L, then this will result in a significant trench length and volume.