FLOOD01266

• County: Lake
• Community: Leadville
• Title: Floodplain information for Leadville
• Date: 3/7/1975
• Prepared For: Lake County
• Prepared By: CWCB
• Floodplain - Doc Type: Floodplain Report/Masterplan

PREFACE

This report 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 ewCB report provides limited engineering information
to support the approximate delineations on the maps, and it provides floodplain management
information to guide the local governments in the use of the maps,

The official floodplain information for the City of Leadville is the Rood Hazard Boundary Map
(FHBM), dated March 7, 1975, The FHBM was prepared by the Federal Insurance Administration
(PIA), however this federal map does not have any published information accompanying it to
describe either the engineering basis of the map or the manner in which the county could use it for
floodplain management. The initial purpose of this report, therefore, is to provide the cornmunity
with limited supporting information, The report includes a description of a hydrologic analysis that
was performed for the community as part of the CWCB's technical assistance program. The
hydrologic analysis is consistent with the map in this report, In addition, the report gives the
community some basic information about floodplain management and it gives some alternatives
that could be considered in formulating and implementing its floodplain management objectives,

A second function of this report is to assure that the FHBM meets the basic technical requirements
for designation and approval by the CWCB, Without a report and without a hydrologic analysis, a
map like the FHBM for Leadville cannot qualify for CWCB designation. Colorado statutes require
that local governments obtain from the CWCB the designation and approval of floodplain
information prior to its use for regulatory purposes, This report provides a means for the FHBM to
meet that statutory objective,

The FHBM was prepared prior to the completion of a CWCB document entitled Guidelines for
Determining lOO-year Flood Flows for Approximate Floodplains (Guidelines). That document
provides the necessary hydrologic information in support of the lOO-year floodplain boundaries
identified on the FHBM, The hydrologic information contained in the Guidelines was used in
preparing this report and it supports the subsequent designation of the Leadville FHBM,