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<br />PREFACE <br /> <br />. <br /> <br />, <br />I <br /> <br />This manual was prepared by the U.S. Geological Survey in cooperation <br />with the Colorado Water Conservation Board, It was developed to provide a <br />simplified method for calculating approximate limits of flood-prone areas <br />along streams in Colorado, The manual contains methods for calculating 10-, <br />50-, 100-, and 500-year peak discharges and flood depths for natural-flow <br />streams. The manual is intended to aid planners, engineers, and officials <br />of local governments in identifying flood-prone areas to fulfill the Intent <br />of the Colorado General Assembly's "Local Government Land Use Control <br />Enabl ing Act of 1974," commonly known as HOLlse Bi'11 10Lll. <br /> <br />Copies of the manual and guidance on its use are available from either <br />agency, The U.S. Geological Survey also can provide other related flood <br />data and technical assistance upon request. <br /> <br />The peak discharge figures for gagin9 stations have been coordinated <br />with other Federal agencies involved in flood studies in Colorado. <br /> <br />, <br />( <br />I <br />~ <br />