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the latter drainage area is more accurate. Drainage area boundaries for Silver View Pond are shown in Figure 1. Of the 145.7 acre drainage area, about 36.7 acres (25.2 percent) is presently impervious surface (e.g. rooftops, roadways and parking areas). These figures assume' completion of the remaining multifamily residential units at Silver Lake Woods North but do not include any future commercial development that may occur along County Road I or TH 10. A breakdown of existing land uses within the drainage area•is shown in Table 1. Table 1. Existing land uses within Silver View Pond Drainage Area, November 1989. aIncludes about 10.8 acres which is anticipated to be developed for commercial use in the future. bExcludes internal streets and access drives within developments. Based on early conceptual plans for future commercial development along County Road I and TH 10, it is anticipated that roughly 10.8 additional acres of commercial use will be added to the drainage area at some point. Roughly 4.7 acres of this area would be impervious surface, resulting in a future total impervious area of 41.4 acres or 28.4 percent of the total drainage area. At full development, the projected land use composition and impervious surface ratio within the drainage area appears to be very reasonable; particularly in light of the fact that Silver View Pond was actually designed for a larger drainage area. On purely a storm water storage basis, Silver View Pond appears perfectly adequate to provide the remaining storage needs within its drainage area. On the other hand, as will be described below in the Water Quality section, the pond is ecologically at a nutrient 73 I Percentage of Land Use Acreage Drainage Area Upland Open Spacea 57.3 39.3% Wetland/Pond 17.5 12.0% Single-family Residential 17.2 11.8% Multi -family Residential 33.6 23.1% Commercial 9.8 6.7% Streets/Highwaysb 10.3 7.1% 145.7 Acres 100.0% aIncludes about 10.8 acres which is anticipated to be developed for commercial use in the future. bExcludes internal streets and access drives within developments. Based on early conceptual plans for future commercial development along County Road I and TH 10, it is anticipated that roughly 10.8 additional acres of commercial use will be added to the drainage area at some point. Roughly 4.7 acres of this area would be impervious surface, resulting in a future total impervious area of 41.4 acres or 28.4 percent of the total drainage area. At full development, the projected land use composition and impervious surface ratio within the drainage area appears to be very reasonable; particularly in light of the fact that Silver View Pond was actually designed for a larger drainage area. On purely a storm water storage basis, Silver View Pond appears perfectly adequate to provide the remaining storage needs within its drainage area. On the other hand, as will be described below in the Water Quality section, the pond is ecologically at a nutrient 73 I