Project Deliverables

This project will be completed in four distinct phases. The Major Drainageway Plan has three phases. The Flood Hazard Area Delineation is completed in one phase utilizing the hydrology from the Major Drainageway Plan. In each phase a draft of that phase’s report sections is provided, the project sponsors review it, and then the final copy is submitted.

Baseline Hydrology Phase

The baseline hydrology serves to quantify the peak stormwater flows associated with the different return frequency storm events. This hydrology takes into account the existing and future land use conditions and is used as the baseline hydrology for the Flood Hazard Area Delineation, the Alternatives Evaluation, and the final Conceptual Preliminary Design Report.

Alternatives Evaluation Phase

The Alternatives Evaluation phase of the project investigates improvement scenarios to assure that the most appropriate design recommendations are made. These improvements include channel and roadway improvements, channel stability measures, water quality recommendations, and overall floodplain management practices.

Conceptual Design Report

Once the Project Sponsors have selected the most desirable alternatives from the Alternatives Evaluation Phase, this phase of the project further develops the plan into a preliminary design. The purpose of the preliminary design is to better define the critical design elements and to refine future expected construction costs.

Flood Hazarad Area Delineation Report

The Flood Hazard Area Delineation (FHAD) defines the limits of the floodplain during a 100-year storm event. This report will be used to update the floodplain delineation along Coal Creek and Rock Creek. This report will depict the existing flooding problems along both creeks without future improvements.

Available Documents

Report Purpose Download PDF File
Baseline Hydrology Report
(September 2012)
Stormwater Flows
Hydrology Report
Alternatives Evaluation Report
(December 2013)
Alternatives Evaluation and Recommended Plan
Final Alternatives Report
Conceptual Design Report
(April 2014)
Conceptual Design of the Selected Plan
Draft Flood Hazard Area Delineation
(February 2014)
Flood Hazard Area Delineation
Draft FHAD Report

*Please note large size of pdf- allow plenty of time to download.



Please direct comments or questions to:

David Delagarza, P.E., CFM
(303) 757-3655

  Project Sponsor  
Urban Drainage and Flood Control District Boulder County City and County of Broomfield Town of Erie City of Lafayette City of Louisville Town of Superior RESPEC