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 100 Level of land surface 90 80 Depth to water 120 240 1920 1940 1960 1980 Year A B C Note: In USGS monitoring well in downtown San Jose. 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] From the yearsto- subsidence attained its greatest average rate of about 8 inches per year LCoose Reduced groundwater pumping and recharge using imported surface water raised groundwater levels substantially and arrested subsidence Choose]

Explanation / Answer

Q1) A

increasein the ground water level clearly seen in the ground water depth graph and corresponding elevation of ground has becomes stable for a short period.

Q2) B

slope of the curve alo maximum in this region, which means that large subsidence has occured with in a short period of time

Q3) C

in this region the land surface is nearly constant and no more subsidence has takenplace

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