FLOOD05064

• Designation Number: 205
• County: Larimer
• Community: Fort Collins
• Basin: South Platte
• Title: Master Drainageway Planning - Cooper Slough, Boxelder Creek, Fort Collins, Larimer County, Colorado
• Date: 8/1/1981
• Designation Date: 1/1/1983
• Floodplain - Doc Type: Floodplain Report/Masterplan

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II... .to devise and formulate methuds, means an(} plans f()r bringioy-
about the greater utilization of the waters of the state and the
prevention of flood damages therefrom and to designate and approve
storm or floodwater runoff channels or basins, and to make such
designations available to legislative bodies of cities and incor-
porated towns, to county planning commissions, and to boards of
adjustment of cities, incorporated towns, and counties of this
state......

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I. INTRODUCTION
Objectives
The objectives of the master drainageway plan are:

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1. To provide a sound technical basis for the management of floodplains
by structural or nonstructural methods within the study area.

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2. To reduce the threat to human life, personal injury, or related
health hazards due to floods.

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as stated in Section 37-60-106(c) of the Colorado Revised Statutes 1973.

The cities, incorporated towns, and counties within the study area may

provide zoning regulations...

3. To reduce or pre~ent flood damage and maintenance requirements for
public and private property and facilities.

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...to establish, regulate, restrict, and limit such uses on or along
any storm or floodwater runoff channel or basin, as such storm or
floodwater runoff channel or basin has been designated and approved
by the Colorado Water Conservation Board, in order to lessen or
avoid the hazards to persons and damage to property resulting from
the accumulation of storm or floodwaters...."

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4. To make effective use of public funds and to enhance the value of
land and other property within the study area.

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5. To formulate and evaluate alternative flood control and drainage
concepts and to determine the most economically feasible and prac-
tical plan for mitigating the flooding problems for the study area.

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as stated in Section 30-28-111 for county governments and Section 31-23-201

for municipal governments of the Colorado Revised Statutes 1973.

Therefore, upon official approval of this report by the Colorado Water

Conservation Board, the areas described as being inundated by the 100-year

flood (Intermediate Regional Flood) can be designated as flood hazard areas

and their use regulated accordingly by th~ local agencies. The terms

"Intermediate Regional Flood", 1I100-year floodll, and 1I0ne percent flood" can

be used interchangeably as they defined the same flood. However, to avoid

confusion, the term "100-year flood" will be used exclusively throughout this

report.

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Purpose and Scope

This report was prepared to guide local officials in planning the use and

regulation of the floodplain areas such that flood hazards and future damages

are eliminated or minimized. It includes information o~ historical flOOds,

existing factors which influence the flood hazard, and the nature and extent

of probable future floods. This report also includes maps delineating flooded

areas for the 100- and SOO-year flood boundaries, flood profiles and

floodplain cross sections showing the high water elevations for the 10-, 50-,

100-, and SOO-year floods at selected reference points. This study identifies

a floodway suited to the wide, shallow flooding along the streams.

This study evaluates structural and nonstructural improvement plans to

mitigate or alleviate flood hazard areas and presents a plan to guide future

floodplain development in the study area. A supplement to this report in the

form of a technical addendum includes the supporting engineering and hydrolo-

gic data which may further be used in engineering studies in the location and

design of road, bridges, and channel modifications.

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ACknowledgements

A Technical Committee was established for this project to review the

progress of the study and to provide technical input for the sponsoring agen-

cies. The Technical Committee included the following individuals:

Mr. Rex Burns, Larimer County, Colorado

Mr. Larry Lang, Colorado Water Conservation Board

Mr. Robert Smith, City of Fort Collins, Colorado

The assistance and cooperation of this committee during the course of this

study is acknowledged and is greatly appreciated.

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Authorization

This report was authorized by the Colorado Water Conservation Board in

joint sponsorship with Larimer County and the City of Fort Collins, Colorado.

The Board's power and duty is...

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