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p DRAINAGE AND STORMWATER MANAGEMENT <br /> One important component of protecting the health, safety, and <br /> welfare of the residents of San Marcos is the drainage system. <br /> The two main purposes of the San Marcos drainage system are to <br /> transport and store stormwater and to infiltrate rainwater.These <br /> processes lessen flooding, enhance water quality, and recharge <br /> the Edwards Aquifer. Natural areas and water courses(e.g., <br /> creeks, rivers, tributaries, ponds, and floodplains)are part of the <br /> primary drainage system. Man-made features(e.g., streets, ditches, <br /> culverts, retention ponds,and gutters)that control stormwater <br /> runoff into the natural areas are part of the secondary drainage <br /> system. Set out in Map 3.10, Existing Watershed and Floodplain Areas, <br /> on page 106, are the primary natural water courses which are fed <br /> by the man-made drainage system. <br /> San Marcos is bisected by many creeks and tributaries and is <br /> bordered by the Blanco River to the north and the San Marcos <br /> River to the east. Each area of the City is broken up into drainage <br /> basins based on the tributary or branch that drains into the <br /> watershed. <br /> Stormwater that drains from the land in San Marcos goes into one <br /> of the following two watersheds: <br /> • Blanco River Watershed <br /> • San Marcos River Watershed <br /> Since developmental practices and regulations can greatly <br /> influence stormwater drainage, and since flooding can occur when <br /> stormwater drainage is not properly managed, it is important <br /> to evaluate drainage plans and both the positive and negative <br /> impacts on drainage for all projects, including private development, <br /> transportation projects, and parks and recreation projects. <br /> Property, buildings, infrastructure, and even life can be impacted if <br /> any part of the drainage system fails. <br /> EDWARDS AQUIFER <br /> Map 3.11,Sensitive Natural Resources, on page 108, shows the <br /> location of the Edwards Aquifer in relation to the City.As San <br /> Marcos sits above the upper portion of the Aquifer,all projects <br /> need to comply with applicable TCEQ Edwards Aquifer Rules. <br /> Chapter 3 I System Analysis, Needs, and Recommendations 1Q5 <br />