Laserfiche WebLink
<br />I <br />I <br />I <br />I <br />I I <br />I <br />I <br />I <br />I <br />I I <br />I <br />I <br />I <br />I <br />I <br />I I <br />I <br />I <br />I <br /> <br />PREFACE <br /> <br />This Hydrology Addendum (HA) is part of a program by the Colorado Water Conservation Board <br />(CWCB) to make approximate floodplain maps prepared by the Federal Emergency Management <br />Agency (FEMA) easier for local governments to use. This CWCB report provides limited <br />engineering information to support the approximate delineations on the FEMA maps, and it <br />provides floodplain management information to guide the local governments in the use of the maps. <br /> <br />The official floodplain information for Arapahoe County and Incorporated Areas is the Flood <br />Insurance Study (PIS), dated August 16, 1995. The FlS was prepared by FEMA and contains both <br />detailed and approximate floodplain delineations, The approximate floodplains do not include any <br />engineering information to describe the basis of the approximate floodplain mapping. The initial <br />purpose of this report, therefore, is to provide the County and incorporated areas with limited <br />supporting information for the approximate floodplain delineations. This HA includes a description <br />of available hydrologic information for major flooding sources within or adjacent to the County. In <br />addition, the HA gives the County some basic information about floodplain management and it <br />provides some alternatives that could be considered in formulating and implementing floodplain <br />management objectives. <br /> <br />A second function of this report is to assure that the FlS meets the basic technical requirements for <br />designation and approval by the CWCB. Without the inclusion of basic engineering information, <br />the approximate floodplain delineations shown on the Arapahoe County Flood Insurance Rate <br />Maps (FIRMs) cannot qualify for CWCB designation. Colorado statutes require that local <br />governments obtain from the CWCB the designation and approval of floodplain information for its <br />use in regulatory purposes. This HA provides a means for the FlS to meet that statutory objective, <br />As new and more detailed floodplain information becomes available, the approximate floodplain <br />areas shown on the FIRM panels will become superseded. The CWCB will designate and approve <br />new information, and rescind old information as appropriate. <br /> <br />1\ <br />