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MILO
CREEK PERMANENT FLOOD IMPROVEMENT PROJECT, WARDNER, ID
TerraGraphics
is the Engineer-of-Record and Hydraulic Engineer for the Milo Creek Flood Control
Project. This project is located within the Bunker Hill Superfund Site and addresses
flooding and sediment contamination of the Cities of Kellogg and Wardner, Idaho.
This project was a cooperative effort between several federal and state agencies
in response to a 25-year flood event in May 1997. Numerous different funding sources
were utilized and managed by TerraGraphics during this project.
Five planning level documents were developed to assess existing conditions, conduct
benefit/cost and feasibility analysis, present alternatives and cost, and present
the engineering
design of selected alternatives. HEC-1 watershed modeling determined project hydrology
and formed the basis for the hydraulic designs. Energy equation models calculated
steady state varied flow profiles, velocities, and stresses throughout the system.
The Milo Creek Flood Control System includes a variety of hydraulic components
to address high velocity discharges, large bedload rates, and acidic water and
soils. This combination of factors has historically consumed traditional pipe
materials within short time frames and threatened the communities with metal contaminated
sediments and floodwaters.
As
a result, the Milo Creek Flood Control System incorporated specialty pipe materials,
large concrete velocity (impact) control structures, sediment/bedload collection
basins, and highly stable stream bank treatments into the final design. The flood
control system was installed within very confined community rights-of-way and
easement limits. Approximately 20 property easements and acquisitions were required.
TerraGraphics conducted construction oversight, inspection, and contract administration.
TerraGraphics prepared the project’s operations and maintenance manual and
assisted the State in forming the Milo Creek Watershed District to assume O&M
responsibilities for the project.
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