Another 55% of the sector consists of gentle slopes between 6% and 15%. These areas are largely single-family lots along the flatter sections of the two ridges and further west and south. Some intensive development continues up the Bearden Hill section of Kingston Pike. Several clusters of multi-family housing are also situated on mildly sloping or rolling land.
Moderate slopes between 16% and 25% exist along various portions of the length of the sector’s two ridges, and are connected in four areas: Forest Heights, Bearden Hill, Kingston Hills and the northern portion of Sequoyah Hills. Slopes steeper than 25% exist only in the bluffs on the outside bends of Fort Loudoun Lake (at Lyons View and below the Armstrong-Lockett House).
The Environmental Constraints Map shows the areas prone to flooding, which are defined by the elevation of a 500-year flood. The east and west ends of the sector are at the upper elevations of their respective drainage basins, and are undisrupted by rising creek levels. Nonetheless, continued development in these areas can lead to increased runoff. Increased flows of stormwater and silt may block sinkholes, leading to serious flooding problems at lower elevations. Flooding is most likely along Fourth Creek and its tributaries, which drain a large portion of the center of the sector, along the inside bend of Fort Loudoun Lake near Cherokee Boulevard. Some of these areas lie within the boundary of the 500-year floodplain, and have a 0.2% chance of being flooded in any given year. Most forms of development should be avoided within the floodplain. Under recently adopted ordinances, the city and county limit fill to 50% of the floodplain area.
The U.S. Fish and Wildlife Service Wetlands Inventory (1989) classifies two arms of Fourth Creek and approximately 15 acres along the shoreline near Lakeshore Mental Health Institute as semi-permanently flooded wetlands. The survey also classifies part of Third Creek as seasonally flooded wetlands.
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