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<br />1. 0 INTRODUCTION <br /> <br />1.1 Purpose of Study <br /> <br />This Flood Insurance Study revises and updates a previous Flood <br />Insurance Study/Flood Insurance Rate Map for the Town of Castle <br />Rock, Douglas County, Colorado. This information will be used by <br />Castle Rock to update existing flood plain regulations as part of <br />the regular phase of the National Flood Insurance Program (NFIP). <br />The information will also be used by local and regional planners <br />to further promote sound land use and flood plain development. <br /> <br />In some states or communities, flood plain management criteria or <br />regulations may exist that are more restrictive or comprehensive <br />than the minimum Federal requirements. In such cases, the more <br />restrictive criteria take precedence and the State (or other juris- <br />dictional agency) will be able to explain them. <br /> <br />1.2 Authority and Acknowledgments <br /> <br />The sources of authority for this Flood Insurance Study are the <br />National Flood Insurance Act of 1968 and the Flood Disaster Protec- <br />tion Act of 1973. <br /> <br />The hydrologic and hydraulic analyses for this study were performed <br />by Howard, Needles, Tammen & Bergendoff, under Contract No. H- <br />4016. That work was completed in July 1977. <br /> <br />The hydrologic and hydraulic analyses for portions of the streams <br />studied by approximate methods were performed by J.F. Sato and <br />Associates, Inc., for the revised Type 19 Flood Insurance Study <br />for the unincorporated areas of Douglas County, ColoradO, for the <br />Federal Emergency Management Agency (FEMA). That work was completed <br />in August 1985. <br /> <br />Hydrologic information was obtained from the initial Castle Rock <br />Flood Insurance StUdy, the Douglas County Flood Insurance Study, <br />and previous Urban Drainage and Flood Control District (UDFCD) <br />reports. <br /> <br />The major portion of the hydraulic analyses was taken directly <br />from the initial Castle Rock Flood Insurance Study and UDFCD reports. <br />The balance of the analyses was developed by J.F. Sato and Associ- <br />ates, Inc. <br /> <br />1.3 Coordination <br /> <br />On September 15, 1977, the results of the initial Flood Insurance <br />Study were reviewed at a final community coordination meeting <br />