Assuming the confining beds being pumped are unconsolidated, what rate of land s
ID: 1713427 • Letter: A
Question
Assuming the confining beds being pumped are unconsolidated, what rate of land subsidence might be expected? [Hint: Use Figure 9.9 data for ratio of land/water table decline]. I'm not 100% sure how to set this up other than pick two points on each scale and divide that ratio into the number of nyears I chose 1955-1920=35 years to get an annual subsidence prediction. Still confused, thanjks in advance
U.S. Geological Survey MWell 7S/IE-7RI Depth to Water, in Feet 3 0 3 3 303 BM P7 & * * * * * * * Bench-Mark Altitude, in Feet 220- 1920 1930 1940 1950 1960 1970 Figure 9,9. Land subsidence data for San Jose, California (from Poland, 1981).Explanation / Answer
As per Graph Shown options are to take values B/w 1920 to 1938 or 1948 to 1968.
Because , the values of graph b/w depth to water and attitute are constant for 1938-48.
You should take values for 1948-68, As the declining rate of water table is high as compared to value corresponding to 1920-40.
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