Question : 11.A number of hydroelectric dams now scheduled for dismantling. What : 1331258

11.A number of hydroelectric dams are now scheduled for dismantling. What is the main reason for this?

a.Their structure has weakened.

b.New findings about the potential for large earthquakes have been discovered.

c.Cheaper and cleaner sources of electrical power have been found.

d.Environmental concerns must be addressed before a dam can be relicensed.

e.The demand for irrigation water has decreased.

12.What is the most environmentally diverse and continually destructive natural hazard in the United States?

a.earthquakes

b.volcanoes

c.river floods

d.hurricanes

e.landslides

13.Where would you NOT be permitted to build a house in a U.S. Government-regulated floodway?

a.in the regulatory floodway

b.in the regulatory floodway fringe

c.on the river side of the standard project flood limit

d.on the side of the regulatory flood limit away from the river

e.outside of the standard project flood limit

14.What dam failure caused the greatest loss of life in the U.S.?

a.Grand Coulee, Washington

b.Teton, Idaho

c.St. Francis, California

d.Johnstown, Pennsylvania

e.Buffalo Creek, West Virginia

15.What is the statistical recurrence interval for a flood of rank 2 in a data set that is 99 years long?

a.on average, once every 10 years

b.on average, once every 20 years

c.on average, once every 30 years

d.on average, once every 40 years

e.on average, once every 50 years

16.Judge the following sentence according to the criteria given below: Engineering solutions aimed at stabilizing rivers (e.g., channelization) typically fail over time BECAUSE they don’t recognize the dynamic nature of flowing water.

a.The assertion and the reason are both correct, and the reason is valid.

b.The assertion and the reason are both correct, but the reason is invalid.

c.The assertion is correct, but the reason is incorrect.

d.The assertion is incorrect, but the reason is correct.

e.Both the assertion and the reason are incorrect.

17.Judge the following sentence according to the criteria given below: Deltas are not subject to deadly flooding by tropical storms BECAUSE their elevations are far above sea level.

a.The assertion and the reason are both correct, and the reason is valid.

b.The assertion and the reason are both correct, but the reason is invalid.

c.The assertion is correct, but the reason is incorrect.

d.The assertion is incorrect, but the reason is correct.

e.Both the assertion and the reason are incorrect.

18.Which of the following is NOT a factor in riverine flood occurrence?

a.topography

b.dissolved solids

c.antecedent rainfall

d.vegetation

e.intensity of rainfall

19.Which of the following statements about the fifty-year flood is true?

a.The fifty-year flood has a 50% chance of happening in a given year.

b.The fifty-year flood has a one-in-fifty chance of happening in any given year.

c.Once a fifty-year flood occurs, the region is safe for 49 years from another fifty-year flood.

d.The fifty-year flood occurs once every fifty years.

e.The fifty-year flood cannot happen twice in the same year.

20.Which of the following is NOT an example of flood proofing?

a.building fish ladders so adult salmon can migrate upstream to spawn

b.building floodwalls of reinforced concrete and continuous piles

c.employing water-resistant building materials in all construction

d.raising structures above the 100-year flood level with artificial fill

e.building artificial levees on top of natural river levees