Land Subsidence from Groundwater Withdrawal Activity 12.6 Name Course/Section: D
ID: 113589 • Letter: L
Question
Land Subsidence from Groundwater Withdrawal Activity 12.6 Name Course/Section: Date: A Santa Clara Valley, California. 1. Based on Fig. 12.11, where are the areas of greatest subsidence in the Santa Clara Valley? 2. What was the total subsidence at San Jose (Fig. A12.6.1) from 1934 to 1967 in feet? Total Subsidence (feet) from 1912 level Year 1912 1920 1934 1935 1936 1937 1940 1948 1955 1960 1963 1967 0.0 0.3 4.6 5.0 5.0 5.2 5.5 5.8 8.0 9.0 11.0 12.7 Figure A12.6.1 Subsidence at benchmark P7 in San Jose, California 3. What was the average annual rate of subsidence for the period of 1934 to 1967 in feet/year? 4. Analyze Fig. 12.11. At what places in the Santa Clara Valley would subsidence cause the most problems? Explain your reasoning 5. Would you expect much subsidence to occur in the darker shaded (tan) areas of Fig. 12.11? Explain. 6. By 1960, the total subsidence at San Jose had reached 9.0 ft. (Fig. A12.6.1). What was the average annual rate of subsidence (in feet/year) for the seven-year period from 1960 through 1967? Show your work. 7. Refer to Fig.A12.2ich hos the variation in several facrn to the ubsidence of the Santa Clara Valley since ~1915. (a) Using Fig. A12.6.2A, about how much has the elevation of benchmark P7 changed since 1970? ft. The water table in San Jose was just about at the ground surface in 1915 but steadily increased to a maximum in the mid-1960s. Using Fig. A126.2B, estimate the maximum water-table depth below the ground surface Since the mid-1960s, the water-table depth has steadily decreased. What effect has the rising water table had on the elevation of the ground surface in San Jose? ft. (d) Think about the trend in precipitation since 1916 shown in Fig. A12.6.2C. Precipitation and snowmelt recharge the ight the observed trend in precipitation have had on the water-table depth? mine Fig. A12.6.2D and d that you can see in the rate of pumping between 1915 and the mid-1960s. What effect did that (e) Groundwater has been pumped in support of agriculture throughout the 20th century. Exa have on the water-table depth?Explanation / Answer
1. Please provide the fig.12.11
2. 1934 = 4.6 feet and 1967 = 12.7 feet so,
Total subsidence is, = 12.7-4.6 = 8.1 feet in between 1934-1967
3. Total number of years = 1967-1934 = 33 years
Total subsidence = 8.1 feet
Avarage annual rate of subsidence = 0.2455 feet/years
For the rest of the questions please provide the respective figures mentioned in respective questions.
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