Translations:Versickerung und Retention/107/en

V_rück = (r_(D,30) x A_ges – (r_(D,2) x C_Dach + r_(D,2) x A_FaG x C_FaG)) x D x 60 / (10000 x 1000)

with: D = 10 Min (from DWA-A-118:2006, Table 4)