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• <br /> (As Presented to Intergovernmental Work Group February 15, 1990) <br /> TABLE 2. IMPERVIOUS COVERAGE IN UNIVERSITY LAKE WATERSHED <br /> As Estimated by CDM and Orange County <br /> Planning Department Methods (*) <br /> IMPERVIOUS COVERAGE <br /> LAND USE SCENARIO (% OF TOTAL WATERSHED) <br /> CDM ORANGE COUNTY <br /> ( 1 ) ALL FOREST 0. 5 0. 5 <br /> (2) EXISTING LAND USE 3. 6 3. 6 <br /> (3) 5-ACRE LOTS, PER CDM 6. 3 6. 3 <br /> (4) 5-ACRE LOTS, 2-ACRES IN CHATHAM 6. 4 6. 4 <br /> (5) EXISTING LOTS GRANDFATHERED 6. 7 6. 7 <br /> ( "CDM PLUS" ) <br /> PLUS ONE ADDITIONAL 2-ACRE LOT 6. 8 7. 0 <br /> PER FAMILY <br /> OR TWO 2-ACRE LOTS PER FAMILY 6. 9 7. 1 <br /> OR THREE 2-ACRE LOTS PER FAMILY 7. 0 7. 2 <br /> (6) OR FIVE 2-ACRE LOTS PER FAMILY 7. 1 7. 4 <br /> ("OCT PLAN") ( "FEB PLAN") <br /> (7) ALL 2-ACRE LOTS 7. 6 8. 3 <br /> (B) CURRENTLY APPROVED L. U. PLANS 8. 1 8. 7 <br /> (9) ALL 1-ACRE LOTS 11. 9 1 1. 9 <br /> NOTES: <br /> (*) The Orange County method increases CDM' s assumed impervious <br /> coverage on 2-acre lots from 6% to 7%, and decreases the <br /> coverage on half-acre lots from 20% to 15%. Average <br /> coverage for 5- and 1-acre lots remains at 4% and 12%, <br /> respectively, in both methods. <br /> ( 1 ) Assumes no development in watershed ; 95. 5% forest, 0. 5% <br /> roads. <br /> (CONTINUED) <br />