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# Exam3Key - Key for Test 3 1 Rainstorms often occur along a...

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Key for Test 3. 1. Rainstorms often occur along a. cold fronts b. warm fronts c. both a and b 2. El Niño conditions occur when . .. a. warm water collects off of Australia b. warm water collects off of Africa c. warm water collects off of South America d. cold water collects off of Africa e. cold water collects off of South America 3. El Niño affects weather in many parts of the globe . . . a. True b. False 4. You own property downstream from where a developer wants to build a mega-mall. They will have a huge mall building and a parking lot to accommodate all the cars that might come to this mall. You go to your local government and ask that the building permit be … a. denied because your flood risk will increase due to increased discharge. b. denied because your flood risk will increase due to increased infiltration. c. approved because your flood risk will decrease due to increased evaporation. d. approved because your flood risk will decrease due to decreased discharge. e. approved because there will be no change in your flood risk. 5. The Red Cedar River is about 20 feet wide and 5 feet deep. The water flows at about 0.2 feet/second. What is the discharge? a. 20 square feet per second b. 20 cubic feet per second c. 10 cubic feet per second d. 20 cubic feet e. 10 square feet per second 6. We talked about the fact that floods are “classified” by how often they occur on the average. Given that definition, what is the probability that a “20-year flood” will occur in any given year? a. 20% b. 10% c. 5% d. 4% e. 2%

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7. Roughly how deep does water have to be to float and then carry a car in a flood? a. 6 inches b. 1 foot c. 2 feet d. 4 feet e 6 feet 8. During a flood… a. most water flow is still within the channel b. water tops over the natural levees and out onto the floodplain c. the water erodes the river channel deeper d. only b and c above e. a, b, and c 9. A stream hydrograph shows the relation between channel size and water velocity a. True b. False 10. Natural levees form a. from well irrigated vegetation along river banks. b. from long shore currents depositing sand along the river bank. c. from the river freezing. The ice expands slightly upon freezing, pushing the river banks out and up. d. where sediment drops out of the water carrying it because the water velocity decreases when it leaves the channel. e. only along braided channels 11. A small, but violent, thunderstorm strikes the eastern Rockies: There will likely be a . . . a. “flash” (upstream) floods in narrow canyons. b. “regional” (downstream) floods in the plains below the Rockies. c. “flash” (downstream) floods in the plains below the Rockies. d.
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Exam3Key - Key for Test 3 1 Rainstorms often occur along a...

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