FLOOD04421

• County: Arapahoe
• County: Douglas
• Community: Arapahoe, Douglas
• Stream Name: Piney Creek, Cottonwood Creek, Lone Tree,
• Basin: South Platte
• Title: Flood Hazard Area Delineation
• Date: 10/1/1975
• Prepared For: UDFCD
• Prepared By: Arapahoe, Douglas
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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- PREFACE -

Revised Statutes 1973.

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Authorization

This report was authorized by the Urban Drainage & Flood Control

Upon acceptance of this report by the Urban Drainage & Flood

Control District and the designation and approval of this report

by the Colorado Water Conservation Board, the areas described

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District in joint sponsorship with the Colorado Water Conserva-

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tion Board. The District has the power to enact District-wide

flood plain regulations. At present, the District makes flood

as being inundated by the 100-year flood (Intermediate Regional
Flood) can be designated as flood hazard areas and their use

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plain information and mapping available for local agencies to

adopt and administer their own flood plain regulations with the

regulated accordingly.

It should be noted that the terms "Intermediate Regional Flood,"

assistance of the District.

"lOO-year Flood," and "one percent flood" can be used interchange-

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ably as they are all defined by the same type of flood event.

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The Colorado Water Conservation Board has the power and duty

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

Purpose and Scope

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as stated in Section 37-60-106 (1) (c) of the Colorado Revised

This report was prepared for the guidance of local officials in

planning the use and regulation of the flood plain. The report

includes information on historical floods and the nature and

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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 "

extent of probable future floods which can be reasonably ex-

pected on the respective study reaches. The 100-year flood

should be given appropriate consideration before planning for

development in the flood plain.

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Statutes 1973. The cities, incorporated towns and counties

within the study area may provide zoning regulations

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

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

stream bed. Elevation reference data is given that can be applied

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section 31-23-201 for municipal governments of the Colorado

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