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<br />It <br /> <br />In addition to the hard copy FIRMs, FEMA also provides digital spatial flood zones known as <br />Q3 for selected counties in the United States. The digital Q3 Flood Data are designed to I <br />provide guidance and a general proximity of the location of Special Flood Hazard Areas. They <br />can also be a valuable tool in screening property addresses within a Geographic Information <br />System to determine flood risks. The Q3 flood zones for Hays County were used with appraisal <br />and census data to perform the flooding risk assessment found in Appendix D. By overlaying <br />the population data with the flood zones, the population in each zone was determined. Using <br />the average persons per household (total population I total number of residential structures; <br />2.39 for Hays County), the number of structures in the various flood hazard zones was <br />determined. Digital spatial layers representing the critical facilities for Hays County were also <br />overlaid by the Q3 flood layer to determine in which zone they are located. <br /> <br />I <br /> <br />I <br /> <br />Ha~'s counIJ', Texas <br />Miligalion Plan <br />45 <br />