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In a groundwater field test, a tracer took 8 hours to travel between two observation wells which are 56 m apart. The difference in water table elevations in these wells was 0.70 m. The volume of the void of the aquifer is 30% of the total volume of the aquifer. What is the hydraulic conductivity of the aquifer, if the dynamic viscosity of water is 0.995 × 10.8 Ns/m2 ?
Availability of drinking water is continuously decreasing. The government decided to identify those sources of drinking water which getting polluted. The following table depicts the number of polluted sources in a district. Source of drinking water getting polluted Number Wells 24 Handpump 12 Dam 12 Borewell 6 Ponds 18 The pictograph table for the above table will be (A) Source of drinking water getting polluted Number symbol = 6 source Wells Handpump Dam Borewell Ponds (B) Source of drinking water getting polluted Number symbol  = 6 source Wells Handpump Dam Borewell Ponds (C) Source of drinking water getting polluted Number symbol  = 6 source Wells Handpump Dam Borewell Ponds (D) Source of drinking water getting polluted Number symbol  = 6 source Wells Handpump Dam Borewell Ponds
For an unconfined aquifer, the specific yield is 20%, specific retention is 15%, and permeability is 35 m/day. Consider the following statements: 1. The porosity of the aquifer is 35%. 2. The transmissibility is 35 m2/day. 3. The volume of water lost from storage per metre drop in the water table per 100 km2 area of the aquifer is 20 million m3. Which of the above statements are correct?
Which of the following statements are correct as regards aquifer characteristics? 1. The storage coefficient is the volume of water released from storage from the entire aquifer due to unit depression of Piezometric head. 2. The storage coefficient is the same as the specific yield for water table aquifer. 3. Both the aquifer constants, viz. storage coefficient S and Transmissivity T are dimensionless numbers. 
Consider the following statements in respect of ground water aquifers: 1. Specific storage is specific capacity per unit depth of the aquifer. 2. Specific capacity is storage coefficient per unit aquifer depth. 3. Specific capacity is a constant for a given well. 4. For one-dimensional flow in a confined aquifer between two water bodies, the piezometric head line in the aquifer is a straight line. Which of the above statements are correct?
We all observe old wells which have dried up. Our elders say that about 25-30 years ago there was sufficient water in the wells, but now these have completely dried up. Select from the following the possible correct reasons for drying up of water in the wells. A. The lakes (ponds) in which rainwater used to collect are no longer there. B. The soil around the trees, well and nearby area is now covered with coal tar/cement. C. No one uses wells as there are taps in every house. D. A number of electric motor driven pumps have come up to draw underground water.
Two statements are followed by three conclusions numbered I, II and III. Assuming the statements to be true, even if they do not conform to real-world knowledge, decide which of the conclusion(s) logically follows from the statements. Statements: All ponds are pools. Some wells are ponds. Conclusions: I. Some ponds are not wells. II. Some wells are pools. III. All pools are wells.
When 3.5 million m3 of water was pumped out from an unconfined aquifer of 6.3 km2 areal extent, the water table was observed to go down by 2.5 m. The specific yield of the aquifer is best approximated as
In an aquifer extending 150 hectare, the water table was 20 m below ground level. Over a period of time the water table dropped to 23 m below the ground level. If the porosity of the aquifer is 0.40 and the specific retention is 0.15, what is the change in groundwater storage of the aquifer?
Consider the following statements: 1. There is no change in temperature when a liquid is being evaporated into vapour 2. Vapour is a mixed phase of liquid and gas in the zone between saturated liquid line and saturated vapour line 3. The saturated dry vapour curve is steeper as compared to saturated liquid curve on a T-s diagram 4. The enthalpy of vaporization decreases with increase in pressure Which of the above statements are correct?