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Sector One Chapter 2 - Today <br />Flood plains <br />There are floodways and floodplains along both the Purgatory and Willow Springs <br />creeks. Approximately 38 percent of the land in Sector One is located in identified <br />floodways or floodplains. <br />There are 99 acres of the sector located in floodways and stream channels. There are 106 <br />additional acres in the 100 -year floodplain, an area which has a 1% chance of being <br />inundated by floodwaters in any given year. The 100 -year floodplain has been adopted <br />by the Federal Emergency Management Agency as the basis for floodplain management <br />nationwide. There are an additional 36 acres of Sector One in the 500 -year floodplain, an <br />area which has a 0.2% chance of being inundated by floodwaters in any given year. <br />Currently in San Marcos, development is prohibited in the floodway, a floodplain permit <br />is required for any development in the 100 -year floodplain, and floodplain permits are <br />not required for development in the 500 -year floodplain. <br />Sector One floodplains are shown on the Natural Features map on the following page. <br />Adopted: September 13, 2004 2 -4 <br />