01 May Risk Assessment: Assessing Flooding Risk for a Dendritic Drainage Pattern
Risk Assessment: Assessing Flooding Risk for a Dendritic Drainage Pattern
Introduction:
In this risk assessment, you will analyze the towns and geological features of a dendritic drainage network in order to understand surface water flow and flooding in the region. .
Instructions:
• Use the map, town descriptions, and figures 1 & 2 to complete this exercise.
• SHOW YOUR WORK for all questions involving calculations.
• You may work together, but your answers must be in your own words. VERBATIM answers will be considered cheating.
Part 1: Normal Flow Conditions
Examine the map of the Murky River region and read the site descriptions for each Town (Q, R, S, T, V, and W).
1. Which is at higher elevation, W or V?
2. Which is at higher elevation, S or Q?
3. At which location is the stream gradient likely higher, T or V?
4. Which feature is the base level for the Murky River? (0.5 pts)
5. What landform (river feature) has the Murky River built out into the Sunrise Sea at its mouth? (0.5 pts)
6. Name the storage areas for this drainage network.
1.
2.
3.
4.
7. Just downstream of where the Northlands and Crystal Rivers meet, normal discharge of the Murky River is ~3800 m3/s.
a. If the flow velocity here is 13 m/s, what is the cross-sectional area of this stream location?
b. Should this location have a larger or smaller cross-sectional area than the stream at Town W?
Part 2: Seasonal Flooding
8. What is the most likely cause for seasonal flooding in this region, given that the flooding occurs in the spring and early summer?
9. Which town is SAFEST from floods? Why?
10. Examine the hydrograph for Town V below. It shows a typical early summer flood for this location. Bank full conditions for the stream is 2500 m3/s.
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