Hazard City: Flood Insurance Rate Maps Assessment
Part L: Using Flood Zone Contours to Determine Elevation
South
Part 3: Flood Insurance Rates
Site 1: 246 Site 2: 1251 Site 3: 221
Part G: Flooding Risk
Walnut Heights
Part F: Stream Gradient
app. 3ft/mile
Part D: Rivers & Elevation
toward East
Part H: 100 Year Flood Risk
3
Part K: Flood Insurance & Property Value
552.50/year
Part M: New Construction & Flooding Downstream
Development can cause more water runoff into a stream and increase the potential for flooding.
Part I: Damming Rivers and Future Floods
It could lower Clearwater River, decreasing the amount of water in its tributary, and decrease the risk in Ralston.
Part J: Past Flooding Events & Current Flood Levels
Paleoflood (ancient flood) deposits have been found in parts of Ralston that are currently in Zone C. Which of these answers provides a possible explanation for this finding?
Part B: Flooding Probabilities
Site 1 has a greater probability for flooding than Site 3. Site 2 has a greater probability for flooding than Site 1.
Part A: Flood Zones
The Hazard City railroad on the south side of the river lies in Zone B and is only in danger of floods larger than the 100-year flood event. All of Downtown is within Zone C and is relatively safe from flooding.
Part E: The Effect of Roads on Flooding
The bridge across the river could block water flow, causing higher water levels and increasing the potential for flooding.