FLOOD01374

• Designation Number: 521
• County: Weld
• Community: Erie, Firestone, Dacono
• Stream Name: Tri-town drainageway, Godding Hollow Basin
• Title: South Weld I-25 Corridor Master Drainage Plan
• Date: 9/8/1999
• Prepared For: Weld County
• Prepared By: Anderson Consulting Engineers, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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L INTRODUCTION

Southwest Weld County is presently experiencing rapid growth and development within
the boundaries of the Godding Hollow and TIi-Town Basins. These basins have a long history
of flooding problems with the most severe problems recently focused within the communities of
Dacono, Firestone and Frederick, In addition, potential flooding and overtopping of Interstate
Highway 25 poses a threat to public health and safety. As future development occurs within the
basins, these existing flooding problems will likely be exacerbated; consequently, the construction
of adequate storm drainage facilities that mitigate both existing and future flooding problems
becomes increasingly important
In support of the need to provide these facilities, Weld County contracted with Anderson
Consulting Engineers, Inc, to develop master drainage plans for the Godding Hollow and Tri-
Town Basins. This report summarizes the results of the master planning efforts for both of these
basins.

1.1 Project Goals and Objectives

The goal of this project was to develop a Master Drainage Plan (MDP) that can be utilized
as a tool for making decisions related to stormwater management within the boundaries of the two
basins, Completion of the master drainage plan for the Godding Hollow and Tri-Town Basins
involved the development of a planning document that would: '

(a) identify long-term capital improvements and rehabilitation measures for the existing
drainage system;

(b) be a tool for implementation of future improvements associated with new
developments within the basin boundaries;

(c) provide a basis for prioritizing and scheduling required improvements
(implementation plan);

(d) provide the flexibility to implement improvements that afford flood protection
while being cost effective;

(e) address water quality issues;

(f) identity uniform criteria for the planning and design of major drainageway facilities
and on-site detention requirements; and

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1.1

Seplt.mtJe.r 8. 1999