The minimum required percentage of pervious surface of a lot in the R-1-A or R-1-B zones shall be fifty percent (50%).
The minimum required percentage of pervious surface of a lot in the R- 2 zone shall be thirty percent (30%).
The minimum required percentage of pervious surface of a lot in the R- 3 zone shall be twenty percent (20%).
D.C. Mun. Regs. tit. 11, r. 11-D308