A horizontal aquifer is capped by a 20m thick clayey aquitard that extends to the ground surface, where the water table

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A Horizontal Aquifer Is Capped By A 20m Thick Clayey Aquitard That Extends To The Ground Surface Where The Water Table 1 (231.89 KiB) Viewed 34 times

A horizontal aquifer is capped by a 20m thick clayey aquitard that extends to the ground surface, where the water table is located. The clay is characterized by a dry bulk density of 1900kg/m3 and a porosity of 20%. (a) Calculate the total stress acting on the top of the aquifer. (b) Calculate the effective stress in the aquifer, assuming an average pressure head in it of 30m. (c) Calculate the compaction caused by pumping, assuming the aquifer to have a thickness of 9m and a vertical compressibility = 2.5 x 10-8m2/N. Assume a . = = head drop of lm. (d) The porosity of the aquifer is 0.30 and its hydraulic conductivity is K = 4.5 x10-5m/s. Calculate the transmissivity and storativity of the aquifer assuming a volumetric compressibility of water = 4.5 x 10-10 m2/N. =