FLOOD04017

• County: Jefferson
• County: Denver
• Community: Columbine Valley, Denver
• Stream Name: Dutch Creek, Lilley Gulch, Coon Creek,
• Basin: South Platte
• Title: Flood Hazard Area Delineation
• Date: 5/1/1978
• Prepared For: Jefferson County / Arapahoe County
• Prepared By: UDFCD
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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PREFACE

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This report was authorized by the Urban Drainage & Flood Control Dis-

trict in joint sponsorship with the Colorado Water Conservation Board.

The District has the power to enact District-wide flood plain regula-

tions. At present, the District makes flood plain information and

mapping available for local agencies to adopt and administer their

own flood plain regulations with the assistance of the District.

Upon acceptance of this report by the Urban Drainage and Flood Control

District and the designation and 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.

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Author i za t i on

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It should be noted that the terms "Intermediate Regional Flood," "100-
year Flood," and "one per cent flood" can be used interchangeably as
they all define the same type of flood event.

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The Colorado Water Conservation Board has the power and duty

Purpose and Scope

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"...to designate and approve storm or floodway runoff
channels or basins, and to make such designations
available to legislative bodies of cities and incorporated
towns; to county planning commissions; and to boards of
adjustment of cities; incorporated towns; and counties of
this state..."

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

1973. The cities, incorporated towns and counties within the study

area may provide zoning regulations...

This report was prepared for the guidance of local officials in planning

the use and regulation of the flood plain. The report includes inform-

ation on historical floods and the nature and extent of probable future

floods which can be reasonably expected on the respective study reaches.

The 100-year flood should be given appropriate consideration before plan-

ning for development in the flood plain.

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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 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..."

as stated in Section 30-28-111 for the county governments and Section

31-23-201 for municipal governments of the Colorado Revised Statutes

1973.

The 100-year flood plain is shown on the Flood Hazard Area Delineation

Maps which delineate the areas that would be inundated by such an event.

Flood profiles show the water depths relative to the ground line. Ele-

vation reference data is given that can be applied across the full width

of the drainageway. Typical cross sections are presented to indicate

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ground level across
lying flood depths.

the drainageway at specified locations and the over-

The flood profiles and flooded area data presented

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are based on future, developed conditions in the basin as determined

from current master planning maps. Possible future improvements to

control floods are not a consideration of this report.

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