FLOOD06965

• County: Adams
• Community: Northglenn, Thornton
• Stream Name: Grange Hall Creek
• Basin: South Platte
• Title: Major Drainageway Planning
• Date: 12/1/1977
• Prepared For: Adams County
• Prepared By: UDFCD
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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The recommended improvements in the upper reaches of Grange Holl Creek ond the

CHAPTER I
INTRODUCTION

moin tributaries should be constructed first because of the higher concentrations of

development in these areas and because greater flood damage losses occur in these areas.

A. Authorization

The upper reaches of Tributary S have the highest average annual damage loss due to

This study, covering the storm drainage considerations and major drainageway

flooding and the recommended improvements in this area should have the highest priority.

planning (Phase B) for the Grange Hall Creek basin, was authorized under the terms of the

contract between the Urban Drainage and Flood Control District (U.D. and F.C.D) and

Hydro-Triad, Ltd., dated February 23, 1976. The notice to proceed for Phase A was

received on February 27, 1976 and Phase B on April 20, 1977. The participating or

sponsoring governmentol agencies, in addition to the U.O. and F.C.D., for this major

drainageway planning report are Adorns County, the City of Northglenn, and the City of

Thornton. The mapping of the bosin was accomplished under a separote contract between

the U.D. and F. C. D. and Bell Mapping Company.

B. Purpose and Scope

The Colorado Water Conservation Board has the power and duty

". . . to designate and approve storm or floodway runoff channels or basins, and to
make such designations availoble to legislative bodies of cities and incorporated
towns; to county planning cOlnmissions; and to boards of adjustment of cities;
i'1corporated towns; and counties of this state. . ,"

as stoted in Section 37 -60-106 (I) (e) of the Colorado Revised Statutes 1973. The cities,

incorporated towns and counties within the study area may provide zoning regulations

". . . 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 31-23-20 I for

municipal governments of the Colorado Revised Statutes 1973.

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