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Layer: prod.DBO.WetlandManagementAreas (0)

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Description: The East Lake Sammamish basin encompasses about 16 square miles of unincorporated King County, on the eastern side of Lake Sammamish (Figure 1). This basin has six sub-basins with four main stream systems, small lakes, and many wetlands and small hillside drainages. The small, often seasonally dry streams flow in a predominantly westerly direction from lake and wetland headwaters over the rolling =plateau. The streams then flow down the steep, erosive western slope of the basin, through ravines, before discharging to Lake Sammamish. The basin currently has a mixed development pattern, ranging from low-density residential and pasture uses to high-density residential and commercial land uses. Its surface-water systems are in good to fair condition. However, the quality of the basin's surface waters, the stability of its slopes and stream channels, and the extent to which residents are protected from flooding and environmental degradation, will be threatened as the basin urbanizes according to existing land-use plans. Control of these problems requires prompt implementation of the management program recommended in this plan.Legend for Development Conditions MapBW-3 No DisturbanceBW-2: Stream Protection Detention StandardBW-1: Conventional Detention StandardCS: Culvert Sizing Criteria IBW-45BF: Baseflow Maintenance (PH-2 & MH-2)P: Pipeline Drainage Area (BW-3RT: Restrict Ravine-Top Clearing and Grading (IJ-6LJ: Protect floodplain (IJ-4) 1to SE 42nd St.)Ph: Control Phosphorus (see plan)W: Wetland Management AreaF: Retain 50% Forest or Other Existing Vegetationc: Cluster New Developments: Require Dry Season Clearing and Gradingi: Limit Impervious to 8% Site Areainf: Require Infiltration of Stormwater Runoffo: other

Copyright Text: King County (1994) and Jasvir Singh, City of Sammamish (2024)

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