The formation of a valley has a hydraulic conductivity of 400 ft/day and porosity of 0.25. The water table gradient was found to be 1 ft over 1000 ft. using two observation wells. The average depth of water table in the aquifer is 100 ft. (a) Determine the rate of flow per unit width of the aquifer. (b) How long it will take the groundwater to travel from the head of valley to the stream bank if the total distance is 1 mile (assume, porosity = 0.25).

A single ideal pumping well, with radius of 1.0 ft and flow rate of 155 gpm, exists in an ideal confined aquifer. The aquifer has a saturated thickness of 82 ft. The pump continues running until equilibrium conditions are reached. The drawdown at the pumping well is 42 ft, and the drawdown at an observation well 138 ft away is 7.5 ft. Determine: Find the transmissivity in ft^2/day and hydraulic conductivity in ft^2/day Find the radius of influence in feet.

Answer the following environmental engineering practice questions.

Determine the rate of flow per unit width of the aquifer

A confined aquifer is 50 m thick and 0.5 km wide. Two observation wells are located 1.4 km apart in the direction of flow. Head in well A is 50,0 m and in well B is 42 m. Hydraulic conductivity K is 0.7 m/day. What is the total daily flow of water through the aquifer? (m^3)

5. From the figure shows an unconfined non homogeneous aquifer between two water bodies at depth of 50 m and 45 m. respectively. Compute the average coefficient of permeability of the aquifer and the rate of flow. K2= 30 m/sec K1= 20 m/sec 50 m 45 m 1000 m 800 m

What is the overall horizontal conductivity for an aquifer with 3 different formations if: formation 1 has a thickness of 7 m and hydraulic conductivity of 15 m/d, formation 2 has a thickness of 12 m and hydraulic conductivity of 6 m/d, formation 3 has a thickness of 16 m and hydraulic conductivity of 1m/d, (Assume that each formation is isotropic and homogeneous) (Please enter the answer with one decimal)

A pumping test in an aquifer has yielded the following data: A pumping well with a diameter of 15 cm pumps at a rate of 12 m³/day, and draws the aquifer down by 3.6 m. Drawdown at a monitoring well 20 m away is 1.1 m. a) Calculate the Transmissivity of the aquifer. Assume this number is representative of the entire aquifer. b) Determine saturated hydraulic conductivity, and identify a soil type from table 7.2 in the Margulis book. The aquifer thickness is 20 m. ●

A well is pumping at an unknown, steady rate in a confined aquifer. Near the pumping well are two observation wells; observation well A is located 8m from the pumping well and B is located 24m from the pump- ing well. The heads in these wells are hA = 134.20 and hB = 134.28 m. You know from prior pumping tests of the well that the well and the observation wells are screened in a confined aquifer with transmissivity T = 1200 m2/day. Assuming that without the well pumping there would be no hydraulic gradient at all, what is the pumping rate of the well?

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