Weber River Flood Damage Assessment - Riverdale City

Riverdale City 2011 Flood Assessment October 13, 2011
Weber River Flood Damage Assessment
The human and environmental factors outlined above combined with a record setting snowpack to
cause the severe flooding experienced during the 2011 runoff. Fortunately, the cool, wet weather of last
spring reduced the intensity of runoff and prevented even more severe flooding in Riverdale City.
Riverdale City residents are not unfamiliar with these types of flooding events; the historic record
indicates that there have been 15 years where peak discharges have been larger than 2011 (Figure 8)
and certainly many residents remember the devastating flood caused by the breach of the Weber-Davis
Canal in 1999. The Weber River Project (USBR) including Rockport and Echo reservoirs has provided
an accumulated $12M in flood control benefits from 1950-1999.
Figure 8-Historic Peak Discharge [cfs]
During our assessment, RiverRestoration identified 14 locations where public infrastructure was
damaged during the 2011 flood event. Table 1 presents the damaged sites and the locations of the
damaged areas are indicated in Figure 9. Individual site assessments are presented in Appendix A.
These assessments described the damage incurred and identify any contributing factors as outlined in
the previous section. The site assessments also identify the actions necessary to repair the damaged
sites to their pre-flood conditions. Where alternative approaches to individual site reparations are
feasible those alternatives are identified. Order of magnitude costs are included in the site assessments.
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