FLOOD04857

• County: Adams
• Community: Adams County
• Basin: South Platte
• Title: Hydrology Addendum Adams County And Incorporated Areas
• Date: 9/1/2000
• Prepared For: Adams County
• Prepared By: CWCB
• Floodplain - Doc Type: Floodplain Report/Masterplan

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PREFACE

This Hydrology Addendum (HA) is part of a program by the Colorado Water Conservation Board
(CWCB) to make approximate floodplain maps prepared by the Federal Emergency Management
Agency (FEMA) easier for local governments to use, This CWCB report provides limited
engineering information to support the approximate delineations on the FEMA maps, and it
provides floodplain management information to guide the local governments in the use of the maps.

The official floodplain information for Adams County and Incorporated Areas is the Flood
Insurance study (FlS), dated August 16, 1995, The FlS was prepared by FEMA and contains both
detailed and approximate floodplain delineations, The approximate floodplains do not include any
engineering information to describe basis of the approximate floodplain mapping, The initial
purpose of this report, therefore, is to provide the county and incorporated areas with limited
supporting information for the approximate floodplain delineations, This HA includes a description
of available hydrologic information for major flooding sources within or adjacent to the county, In
addition, the HA gives the county and incorporated communities some basic information about
floodplain management and it provides some alternatives that could be considered in formulating
and implementing floodplain management objectives,

A second function of this report is to assure that the FlS meets the basic technical requirements for
designation and approval by the CWCB, Without the inclusion of basic engineering information,
the approximate floodplain delineations shown on the Adams County Flood Insurance Rate Maps
(FIRMs) cannot qualify for CWCB designation. Colorado statutes require that local governments
obtain from the CWCB the designation and approval of floodplain information for its use in
regulatory purposes. This HA provides a means for the FIRMs to meet that statutory objective, As
new and more detailed floodplain information becomes available, the approximate floodplain areas
shown on the FIRM panels will become superseded, The CWCB will designate and approve new
information, and rescind old information as appropriate,

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