FLOOD00734

• Designation Number: 213
• County: Adams
• Community: Thornton
• Stream Name: Brantner Gulch and Tributaries
• Title: Flood Hazard Area Delineation - Brantner Gulch and Tributaries
• Date: 1/1/1983
• Designation Date: 5/1/1983
• Floodplain - Doc Type: Floodplain Report/Masterplan

r

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I

2

I. INTRODUCTION

The cities, incorporated towns and counties within the

study area may provide zoning regulations

This report has been prepared for the Urban Drainage and

"...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..."

Flood Control'District (UDFCD), the City of Thornton, and

Adams County. It delineates the potential hazard associated

with a 100-year flood on the channels of Brantner Gulch, its

tributaries, and Regional Park Tributaries North and South.

as stated in Section 30-28-11 for the county governments and

The flood plains are deemed accurate within the limitations of

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

hydrologic methodology, water surface profile computations, and

Revised Statutes 1973.

the scales of the mapping utilized. The report assumes that

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

the drainage basin is fully developed and that the channel

configuration is that which exists in 1982. The capacities of

all culverts, storm sewers and bridges have been evaluated, and

it is assumed that all facilities are free of debris during

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

flooding.

their use regulated accordingly. The terms "Intermediate

Regional Flood," "lOO-year flood," and "one percent probabiLity

Authorization

flood" can be used interchangeably, since they all define the

This report was authorized by the Urban Drainage and Flood

same flood event.

Control District in joint sponsorship with the City of Thornton
and Adams County. The Flood Control District provides flood

plain information and mapping to enable local governments to

Purpose and Scope
This report was prepared for local officials as a guidance

adopt and administer flood plain regulations.

in planning the use and regulation of the floodplain. The

report presents an estimate of the nature and extent of probable

future floods which can be reasonably expected along the studied

channels.