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<br /> Chapter 2 Sector Two Today <br /> The Natural Environment <br /> Geology <br /> Sector Two, along with Sector Three and Sectors One and Eight, is located in the <br /> Edwards Plateau. This area is hilly and characterized by rocky, shallow soil. These areas <br /> sit above the Balcones Escarpment. <br /> Topography <br /> Land elevations in Sector Two vary from 812 feet above sea level along Ranch Road 12 <br /> between Bishop Street and Franklin Drive to 641 feet above sea level near the intersection <br /> of Prospect Street and Columbia Avenue. The Sector Two Topography map is presented <br /> on the following page. <br /> Edwards Aquifer Zone <br /> The Edwards Aquifer is the water-bearing underground network of porous and <br /> honeycombed limestone formation of the Edwards Plateau. It is the source of water for <br /> San Marcos, as well as over 1.5 million other Texans, and is the source of the San Marcos <br /> River. A northwestern and southwestern portions of Sector Two (includes the Greater <br /> Castle Forest Neighborhood and a portion of the Westover and Southwest Hills <br /> neighborhoods) is in the recharge zone. The recharge zone is an area of fractures, caves <br /> and porous limestone that provides a path for water to run from the surface into the <br /> artesian are of the aquifer. The remainder of Sector Two is located in the transition zone, <br /> where faults, fractures, and other geologic features present possible avenues for recharge <br /> of surface water into the aquifer. <br /> Watersheds <br /> A watershed is an area that drains into a river or creek. Sector Two lies in the Purgatory <br /> Creek watershed. <br /> Flood Plains <br /> There are no floodways or flood plains located in Sector Two. <br /> 2-2 <br />