Weber River Flood Damage Assessment - Riverdale City

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Riverdale City 2011 Flood Assessment October 13, 2011 Riverdale City 2011 Flood Assessment October 13, 2011 Table of Contents Introduction..............................................................................................................................................................1 Weber River Geomorphology and Ecology ..............................................................................................................2 Weber River Flood Damage Assessment............................................................................................................... 10 Flood Mitigation Opportunities............................................................................................................................. 15 Ecosystem Enhancement Opportunities ............................................................................................................... 18 Recreational Enhancement Opportunities............................................................................................................ 24 Summary................................................................................................................................................................ 27 APPENDIX A‐Flood Damage Assessments ............................................................................................................. 28 #1‐Weber River Parkway Collapse ................................................................................................................ 28 #2‐Bank Collapse Across From Riverdale Mobile Estates ............................................................................. 36 #3‐Frisbee Golf Course Riprap Failure........................................................................................................... 39 #4‐Riverdale Play Park, Grade control and Riprap Failure ............................................................................ 44 #5‐54” RCP outfall @ W4400S & S Weber River Dr. ..................................................................................... 54 #6 #14‐Two 36” RCP outfalls and Rip‐rap @ Riverdale Rd. Bridge ............................................................... 57 #7‐Concrete Revetment at Les Schwab Tire.................................................................................................. 61 #8‐Riprap at 4600S and Weber River Dr. Bridge ........................................................................................... 65 #9 & #14‐Creekside Trailhead Path Erosion @ River Glen Subdivision......................................................... 67 #10‐Failed Bank Stabilization ........................................................................................................................ 77 #11‐Failed Bank Stabilization ........................................................................................................................ 81 #12‐Failed Bank Stabilization ........................................................................................................................ 87
Riverdale City 2011 Flood Assessment October 13, 2011 Table of Figures Figure 1-Example of large alluvial deposits upstream of Riverdale City. ................................................ 3 Figure 2-Active channel upstream of Riverdale City ............................................................................... 3 Figure 3-1953 Aerial photo shows channel meander pattern of Weber River through Riverdale City..... 5 Figure 4-2009 Aerial photo shows current meander pattern of Weber River through Riverdale City...... 7 Figure 5-Weber River Annual Average Discharge.................................................................................... 8 Figure 6-Overgrown Riparian Vegetation................................................................................................. 8 Figure 7-Fine sediment deposition resulting from decreased overbank velocities................................... 9 Figure 8-Historic Peak Discharge [cfs]................................................................................................... 10 Figure 9-Flood Damage Sites ................................................................................................................. 13 Figure 10-Flood Mitigation Concept Plan .............................................................................................. 17 Figure 11-Ecosystem Enhancement Opportunities................................................................................. 19 Figure 12-North Trailhead Wetland ........................................................................................................ 20 Figure 13-Oxbow wetland ...................................................................................................................... 21 Figure 14-Brine Shrimp Wetland concrete fill........................................................................................ 22 Figure 15-Recreational Enhancements ................................................................................................... 26
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Weber River Flood Damage Assessment - Riverdale City

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