This figure includes two graphs for Santa Clara County, California, for the peri

Question

This figure includes two graphs for Santa Clara County, California, for the period of 1910-2000: (1) Change in land surface elevation, and (2) Depth to groundwater. Land subsidence caused by over extraction of groundwater can be an environmental hazard, especially in arid regions.

Match each of the three statements below to the most likely period of time they occurred according to the graphs.

Subsidence slowed briefly due to a recharge program instituted by the Santa Clara Valley Water district, but eventually subsidence resumed at a rate equal to that prior to the recharge program.

      [ Choose ]            B            C            A      

From the years ____ to ____ subsidence attained its greatest average rate of about 8 inches per year.

      [ Choose ]            B            C            A      

Reduced groundwater pumping and recharge using imported surface water raised groundwater levels substantially and arrested subsidence.

      [ Choose ]            B            C            A      

Explanation / Answer

1. Subsidence slowed briefly due to a recharge program instituted by the Santa Clara Valley Water district, but eventually subsidence resumed at a rate equal to that prior to the recharge program. - A

2. From the years B to A subsidence attained its greatest average rate of about 8 inches per year.

3. Reduced groundwater pumping and recharge using imported surface water raised groundwater levels substantially and arrested subsidence. - C

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