47. What changes occur in a confined aquifer adjacent to a pumped well? a. a con

Question

47. What changes occur in a confined aquifer adjacent to a pumped well? a. a cone shaped increase of fluid pressures forms adjacent to the well b. the zone adjacent to the well becomes unsaturated c. the effective stress increases adjacent to the well d. all of the above 48. Well A has a piezometer reading of hi and Well B has a piezometer reading of h2. If ha a. aquifer water is flowing from the Well A location towards the Well B location b. the direction of aquifer water flow cannot be determined c the hydraulic gradient can be calculated using the head difference and the known d. none of the above distance between the wells 49. Since 2007, what is the "long term" trend in the depth to the water level measured for the three USGS groundwater Texas stations examined in the homework assignment? a. no changes in the depth to the water have occurred b. the depth to the water has increased in all cases c. data was not available for all of the sites d. none of the above 50. Which of the following materials has the lowest permeability? a. sandstone b. clean sand c. shale d. gravel

Explanation / Answer

47) c.the effective stress increases adjacent to the well.

Note: In a confined aquifer adjacent to a pumped well , intergranular stress which is also called as effective stress increases.

50) c.shale

Shale is impermeable.Water will not flow through shale.

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