Weber River Flood Damage Assessment - Riverdale City

Riverdale City 2011 Flood Assessment October 13, 2011
Flood Assessment Point:
#8‐Riprap at 4600S and Weber River Dr. Bridge
GPS Coordinates: 8-16-11 Points 28 30
Direction to Assessment
Point:
Under Bridge at 4600S and Weber River Dr.
Project Priority: High Moderate Low
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Description of Damage: The rip-rap failing and unstable.
Structures: Bridge
Geomorphic Description: The riprap blanket is not thick enough, does not extend far
enough, does not appear to have fabric, and is not keyed in.
Additionally, the riprap may be inadequately sized and may
not be angular enough. There is insufficient toe stability.
Habitat Considerations: Source of sediment
Flood Damage Repair: � $25,000-$50,000
Measures: � Option 1 (Flood Damage Replacement Project)
o Install properly engineered revetment,
extending up and downstream sufficient
distance, and keyed in
o Biostabilize up and downstream of revetment
o Stabilize Toe
o $30,000-$64,000
Photographs: � IMGP0178
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