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Significant technological advances have been made in the integration of low -cost <br />topographic data called LIDAR with computerized flood models. Many Lower <br />Guadalupe communities have new LIDAR, and GBRA is working with TWDB to <br />Computerized rainfall -runoff and flood elevation models, and Geographical Information <br />Systems now offer GBRA the ability to use LIDAR to develop basin -wide flood <br />information that is accurate and useful. The output can be used to improve FEMA <br />floodplain information, generate flood inundation forecasting for the NWS, and allow <br />analyses of both structural and non - structural cost effective flood damage reduction <br />projects. <br />GBRA plans to work with the Corps and TWDB to update existing studies and develop <br />new studies for the lower Guadalupe River to provide a complete "lower basin" study. <br />All available information from existing and ongoing studies will be utilized. Known <br />studies that are <br />underway or planned <br />and may be incorporated <br />are: l., "' s <br />• GBRA's study of <br />Colletto Creek. <br />• The City of New <br />Braunfels and <br />Comal County have <br />I LWI <br />�r2,1 <br />Existing USACE New HYdroMDY <br />Foloceu Model <br />c� <br />_ v `® i <br />Model <br />HALFF' <br />