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.