4:21 PM a online.epcc.edu \"11 Sprint ? Exercise Four /Shaping Earth\'s Surface:

Question

4:21 PM a online.epcc.edu "11 Sprint ? Exercise Four /Shaping Earth's Surface: Running Water and Groundwater 69 ce ses, surface subsi- groundwater from Well water level 40 80 120 160 200 240 280 320 for many areas. s Vegas, Houston- tral Valley of Cali ence caused by 2 In Mexico City material resulting as the water table ven meters of sub- s an increased re- replenishing the 10 Santa Clara sidence 12 1910 1920 1930 1940 1950 1960 1970 dence caused from Santa Clara Valley San Fran Figure 4.18 Ground subsidence and water level in a well in the Santa Clara Valley, California. (Data courtesy of U.S. Geological cisco Bay Val n Figure 4.18 l subsidence in the Il in the same area. Questions 54-58 refer to Figure 4.18 54. What is the general relation between the ground subsidence and level of water in the well illus- trated on the graph? What was the total ground subsidence and total drop in the level of water in the well during the od shown on the graph? Total ground subsidence Total drop in well level- ft

Explanation / Answer

54. Subsidence means the sinking or lowering of the land and groundwater is one of the reasons for sinking of the land or subsidence. Here, from the graph, it can be said that the subsidence increased gradually with decreasing water level in the well.

Total ground subsidence = Final ground elevation - Initial elevation of the ground = 13 - 0 = 13 feet.

Total drop in water level = Final water level - Initial water level = 200 - 0 = 200 feet

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