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PARADISE
CREEK STREAM RESTORATION, MOSCOW, IDAHO
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Paradise
Creek Flood of 1996 |
Paradise Creek Restoration Phases I through VII Engineers planned, analyzed, designed,
and provided construction oversight assistance for reconstructing five phases
of Paradise Creek near Moscow, Idaho. Phase I restored 1,200 feet of stream and
consisted of excavating 12,000 cubic yards to restore the original floodplain
and installing a low flow and overflow channel, oxbow ponds, and stream bank treatments.
Phase II consisted of floodplain improvements including streambank treatments,
revegetation, and a wetlands treatment system to polish City of Moscow Wastewater
Treatment Plant effluent. Phase III consisted of developing conceptual engineering
drawings featuring floodplain expansion, low flow and overflow channels, and streambank
treatments for restoring 1,200 feet of Paradise Creek near the University of Idaho
campus. During Phase IV, floodplain modeling of the stream corridor and HEC-2
analysis on homeowner’s properties was performed to determine possible impacts
on the floodway from proposed modifications including log revetments.
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Paradise
Creek Restoration |
Phase V consisted of conceptual and construction drawings for restoring 3,000
linear feet of Paradise Creek through agricultural lands by developing the grading
plan and channel alignment as well as vegetative covers on the stream banks and
in the immediate vicinity of the channel. Phases I, III, IV, and V utilized HEC-RAS
computer model analysis for determining dominant flow and floodplain design. TerraGraphics
worked with the Corps of Engineers and the Federal Emergency Management Agency
to revised floodplain maps and obtain stream alteration permits. Restoration design
included meanders, biofiltration treatment swales, multi stage low/high flow channel
section, streambank stabilization, and wetland creation.
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