Boulder Creek Floodplain Study
Project Summary
Completed in 2013, the primary purpose of the Boulder Creek Floodplain Study was to define various flood hazards for Boulder Creek over a 6.2-mile reach through the City of Boulder and a portion of unincorporated Boulder County, including 7.5 miles of 30 distributary flow paths along adjacent drainage corridors and city streets. This project would be classified as a hydraulic study with flood hazard mapping and a Physical Map Revision (PMR).
Details
- Client/Owner: City of Boulder
- Project Location: City of Boulder, Colorado
- Approximate Project Cost: $911,000
- Project Completion Date: September 2013
- Project Components:
- Field reconnaissance efforts
- Field surveying
- Hydrologic evaluation and modeling for the Boulder Creek watershed
- Development of six hydraulic (HEC-RAS) models for Boulder Creek
- Hydraulic modeling for Boulder Creek included the 10-, 25-, 50-, 100- and 500-year events, the City-defined conveyance zone (½-foot rise floodway), and high hazard zone (Product 4 Corridor)
- Flood hazard mapping along Boulder Creek
- Two-dimensional modeling (using FLO-2D)
- Development of the graphical flood profiles, tables, and text providing detailed documentation of the study for incorporation into the Boulder County Flood Insurance Study (FIS)
- Preparation of floodplain and floodway information in support of a Letter of Map Revision (LOMR)/Physical Map Revision (PMR) submittal to FEMA
- Supporting City of Boulder staff through the public education and review process
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