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I <br /> 1 <br /> Table 3-1 I <br /> Drainage Subcatchment Areas and Impervious Characteristics <br /> I Proposed Action (R1) and 1988 CSDP Master Plan Conditions <br /> Powder Mill Gulch Basin, North and South Complex Areas <br /> Page 3 of 4 <br /> I 9 Estimated Impervious Area Estimated Impetvious Area <br /> Drainage Subcatchment Percent (acres) <br /> Subcatchment Drainage Area <br /> I <br /> Nn. (acres) RI 198$CSDP RI 1988 CSDP <br /> 56 23.3 98.0 70.0 22 8 163 <br /> 11/11041111 <br /> 57 7.9 100.0 100.0 7.9 7.9 <br /> I58 6.4 100.0 100.0 6.4 6.4 <br /> 59 2.2 95.0 100.0 2.1 2.2 <br /> I60 1.0 100.0 100.0 1.0 1.0 <br /> 61 5.9 100.0 100.0 5.9 5.9 <br /> I 62 4.3 100.0 100.0 43 4.3 <br /> 63 3.1 100.0 100.0 3.1 3.1 <br /> 64 3.6 100.0 100.0 3.6 3.6 <br /> I65 673 60.0 25.0 40.4 16.8 <br /> 66 3.9 100.0 100.0 3.9 3.9 <br /> I67 6.2 100.0 100.0 6.2 6.2 <br /> 68 2.6 100.0 100.0 2.6 2.6 <br /> 69 6.7 100.0 100.0 6.7 6.7 <br /> I70 17.7 80.0 20.0 14.2 3.5 <br /> 71c 26.7 80.0 80.0 21.4 21.4 <br /> I <br /> 72c 50.3 50.0 50.0 25.2 25.2 <br /> 73c 24.4 70.0 70.0 17.1 17.1 <br /> I <br /> 75 160.2 10.0 10.0 16.0 16.0 <br /> 7 13.6 80.0 25.0 10.9 3.4 <br /> Immo <br /> 76 2.2 100.0 100.0 2.2 2.2 <br /> I77 1.1 100.0 . 100.0 1.1 1.1 <br /> 78 6.3 100,0 100.0 63 6.3 <br /> I <br /> 79 -- -- -- 9.1a <br /> -- -- 12.43 <br /> 81 _. ,. -- 7.8a <br /> t <br /> 82 5.1 70.0 100.0 3.6 5.1 <br /> I <br /> 3-4 <br /> I <br />