A confined aquifer with transmissivity 7.0x10-3 m2/s and storativity 5.0x10-4 is pumped by two wells 35 m apart. One well is pumped at 7.6 liter/s and one at 15.2 liter/s. Plot the drawdown ho-h as a function of position along the line joining the two wells at a time 4 hours after the start of pumping.

A tube well of 30 cm dia. is installed in a confined aquifer having 20 m thickness by WASA in the Gulberg area. Two observatory wells are installed at a distance of 120m and 160m from the center of main tube well. Under the constant Pumpage rate of 1500 L/min, the observed water depth in the observatory wells is 58m and 59m respectively. The radius of cone of depression was 300m and depth of water (H) at zero drawdown is 65 m. With the above data calculate: 1) Co-efficient of transmissivity (T) and Co-efficient of Permeability (K).

Two identical groundwater pumps are operating 4.2 km apart. Each pump well structure has a tube diameter of 90cm. The original water table has an elevation of 60m and the hydraulic conductivity is 32m/day. However, it is maintained that the maximum drawdown (at the tube) is 14 m. The water table will not change at the midpoint between the two pump wells. If the water source is from a confined aquifer with thickness of 5m: A. Determine the drawdown at a point 0.5 km from the pump. B. Determine the discharge of each groundwater pump in m^3/s.

A 45-cm well penetrates an unconfined aquifer of saturated thickness 30 m completely. Under a steady pumping rate for a long time the drawdowns at two observation wells 15 and 30 m from the well are 5.0 and 4.2 m respectively. If the permeability of the aquifer is 20 m/day, determine the discharge and the drawdown at the pumping well. Ans. 2556 lpm;    10.54 m

A tube well of 30 cm dia. is installed in a confined aquifer having 20 m thickness in the Gulberg area. Two observatory wells are installed at a distance of 120m and 160m from the center of main tube well. Under the constant Pumpage rate of 1500 L/min, the observed water depth in the observatory wells is 58m and 59m respectively. The radius of cone of depression was 300m and depth of water (H) at zero drawdown is 65 m. With the above data calculate: 1) Co-efficient of transmissivity (T) and Co-efficient of Permeability (K).

A pumping well extracts water at a rate of 0.94 ML/d from an unconfined, homogeneous aquifer of hydraulic conductivity 13.8 m/d. An observation well at 247.8 m from the well has a steady-state water level of 252.4 m AHD. The base of the aquifer is 174.3 m AHD. Ignoring any rainfall recharge, what would be the watertable elevation at the edge of the well, assuming the well is 161 mm in diameter?

A confined aquifer with transmissivity 7.0x10-3 m2/s and storativity 5.0x10-4 is pumped by two wells 35 m apart. One well is pumped at 7.6 liter/s and one at 15.2 liter/s. Plot the drawdown h0-h as a function of position along the line joining the two wells at a time 4 hours after the start of pumping.

A well pumps at a steady rate of 70gallons/minute (265L/min). It is located 50ft (15.2m) from a lakeshore that is roughly straight. The well is installed in a 6 inch (15.2cm) diameter hole. The well screen and the lake penetrate the same confined aquifer. While pumping, the head in the well is 6.5ft (1.98m) lower than the head in the lake. Estimate the average transmissivity of the aquifer near the well and report your answer inft2/day or m2/day. Assume that without the well pumping, the head at the well is essentially the same as the head in the lake. Be careful to use consistent units in your calculations.

The transmissivity T and storativity S of a completely confined (nonleaky) artesian aquifer are 1000 m2/day and 3.03x10-5, respectively. A fully penetrating production well is discharging water at a constant rate of 250 m3/hour. Calculate drawdown at an observation point located 200 m away from the production well after pumping for 1 day. At the end of 7 days the well is shut off, determine the residual drawdown one day after the pump is shut off. How would this calculation change if this were an injection well instead of a pumping well, and what would the cone look like?

A community of 15,000 capita and fire demand of 35 L/s for six hours is to be served by a 50 cm diameter well. The well is constructed in a confined aquifer with a uniform thickness of 15m and hydraulic conductivity of 100 m/d. Two observation wells are installed at radial distance of 50 m and 150 m. The drawdowns in the wells are 1.7 m and 1.3 m respectively.Find:a) the discharge of the well.b) water consumption (l/c/d).c) the power needed to lift the water to the ground surface if the original piezometer level is 20 m below the ground surface.