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I I I I I I I I I I I I I I I I I I I as stated in Section 30-28-111 and 31-23-301 of the Colorado Revised Statutes. Therefore, upon official approval of this report by the ColoradO Water Conservation Board, the areas described as being inundated by the 100-year flood can be designated as approximate flood hazard areas and their use regulated accordingly by Costilla County. 1.3 Acknowledqments The assistance and cooperation of the individuals, agencies, firms, and organizations listed below in supplying information are appreciated and gratefully acknowledged: Larry F. Lang - Chief, Flood Control & Floodplain Management Section, Colorado Water Conservation Board William P. Stanton - Supervising Water Resource Specialist Colorado Water Conservation Board Brian R. Hyde - Senior Water Resource Specialist Colorado Water Conservation Board Dr. Donald Doehring - Colorado State University, Department of Earth Resources Maclovio Gallegos - Costilla County Administrator Prax Ortega - Costilla County Emergency Services Director Dennis Heller - wac Engineering, Inc. Joseph Gallegos - Resident of Costilla County 1.4 Related Flood Studies A series of Maps of Flood Prone Areas, providing approximate floodplain delineations throughout the San Luis Valley, was prepared under the supervision of Dr. Donald Doehring of the Colorado State University Department of Earth Resources in 1974 for the San Luis Valley Council of Governments (now diSbanded). These maps were based on statistical analyses of stream gage records, relatively widely spaced field-surveyed cross sections, hand calculations of flood depths at those cross-sections, and a field review of the preliminary floodplain delineations. In Costilla County portions of the Rio Grande, Culebra Creek, and Rito Seco were studied. The delineations for the Rio Grande have been -2-