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as stated in Section 30-28--111 and 31-23-301 of the Colorado <br />Revised Statutes. <br />Therefore, upon official approval of this report by ttie <br />Colorado Water Conservation Board, the areas described as being <br />inundated by the 100-year flood can be designated as <br />approximate flood ha2ard areas and their use regulated <br />accordingly by Costilla County. <br />1.3 Acknowled4ments <br />The assistance and cooperation of the individuals, <br />agencies, firms, and organizations listed below in supplyi.ng <br />information are appreciated and gratefully acknowledqed: <br />Larry F. Lang - Chief, Flood Control & Floodpldin <br />Management Section, Colorado W~ter <br />Conservation Board <br />William P. Stanton - Colorado Water Conservation Boa~rd <br />Brian R. Hyde - Colorado Water ConservaCion Bo~rd <br />Barbara Jenkins - Colorado Water Conservation Boa:rd <br />Dr. Donald Doehring - Colorado State University, <br />Department of Earth Resources <br />Maclovio Gallegos - Costilla County <br />Prax Ortega - Costilla County <br />Dennis Heller - WRC Engineering, Inc. <br />Joseph Gallegos - Resident of Costilla County <br />1.4 ReYated Flood Studies <br />A series of Maps of F'lood Prone Areas, providing <br />app~oximate floodplain delineations throughout the San Luis <br />Va11ey, was prepar~d under the supervision of Dr. Uanald <br />Doehring of the Colorado State University Department of Earth <br />Resources in 1974 for the San Luis Valley Council of <br />Governments (now disbanded). These maps were based on <br />statistical analyses of stream gaqe records, relatively widely <br />spaced field-surveyed cross sections, hand calculations of <br />flood depths at those cross-sections, and a field review of the <br />pre~iminary f_loodplain delineations. In Costilla County <br />portions of the Rio Grande, Culebra Creek, and Rito Seco were <br />studied. The delineations for the Rio Grande have been <br />-?_- <br />