Daily Question June 16, 2015 (EIA Discussion): 3 wealth points for replies, plus 5 wealth points for correct answers
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This post was last edited by Zhang Xiaopeng on 2015-6-24 at 12:51. 24. A leakage occurred in a sewage tank; there is a well tapping into an artesian aquifer 480 meters downstream of that site. The aquifer of this water well has a permeability coefficient of 120 m/d, an effective porosity of 40%, and a hydraulic gradient of 0.5%. The predicted time for sewage leakage to move horizontally to the water intake well after entering the aquifer is ( ). A. 4 days B. 192 days C. 320 days D. 600 days Explanation: Flow rate = (permeability coefficient/effective porosity) * hydraulic gradient. Time = 480 m/flow rate. Flow rate = (120/0.4) * 0.5% = 1.5 m/day. Time = 480/1.5 = 320 days. The correct answer is C
A leakage occurred in a wastewater tank, and there is a well in an artesian aquifer 480 meters downstream of that wastewater source. The aquifer of this water well has a permeability coefficient of 120 m/d, an effective porosity of 40%, and a hydraulic gradient of 0.5%. The time it takes for wastewater to migrate horizontally to the water extraction wells after seeping into the aquifer is (B). A. 4 days B. 192 days C. 320 days D. 600 days. Please don’t be offended if this is just a guess; P
I can’t do it either; I’ll guess. Choose C
B. . . . . B. . . . . B. . . . . B. . . . . B. . . . . B. . . . . B. . . . . B. . . . .
24. A sewage tank leaked, and there is a groundwater well in an artesian aquifer 480 meters downstream. The aquifer of this water well has a permeability coefficient of 120 m/d, an effective porosity of 40%, and a hydraulic gradient of 0.5%. The predicted time for the sewage leakage to move horizontally to the water extraction well after entering the aquifer is (C). A. 4 days B. 192 days C. 320 days D. 600 days
A leakage occurred in a wastewater tank, and there is a well in an artesian aquifer 480 meters downstream of that wastewater source. The aquifer of this water well has a permeability coefficient of 120 m/d, an effective porosity of 40%, and a hydraulic gradient of 0.5%. The predicted time for the sewage leakage to move horizontally to the water intake well after entering the aquifer is (C. 320 days).
A leakage occurred in a wastewater tank, and there is a well in an artesian aquifer 480 meters downstream of that wastewater source. The aquifer of this water well has a permeability coefficient of 120 m/d, an effective porosity of 40%, and a hydraulic gradient of 0.5%. The time it takes for the polluted water to migrate horizontally to the water extraction wells after seeping into the aquifer is (C). A. 4 days B. 192 days C. 320 days D. 600 days