The formation of a valley has a hydraulic conductivity of 400 ft/day and porosity of 0.25. Thewater table gradient was found to be 1 ft over 1000 ft. using two observation wells. The averagedepth 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 streambank if the total distance is 1 mile (assume, porosity = 0.25).

In a valley situation, where groundwater flow parameters are impacted by hydraulic conductivity,…

Answered: The formation of a valley has a…

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.5P

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2. An aquifer has a hydraulic conductivity of 180 ft/day, and effective porosity of 33% and is under a hydraulic gradient of 0.0004. a) Compute the Darcy velocity (also called Darcy flux). b) Compute the actual velocity (also known as the average linear velocity). c) The water temperature was 14 Degree C, and the mean pore diameter was 0.30 mm. d) Was it permissible to use Darcy's law under these circumstances? e) What is the reason for your answer?
A pump well is dug through a confined aquifer having a thickness of 32 meters. The piezometric surface of the aquifer is 18 meters measured from the top impermeable layer. The first observation well is 75 feet directly west of the pump well and the second observation well is 75 feet directly north of the first observation well. Determine the hydraulic conductivity of the aquifer if it supplies a discharge of 10 liters per second and the drawdown of the observation wells are 13 feet and 23 feet.
The laboratory apparatus shown in the figure below maintains a constant head in both the upper and lower reservoirs. The soil sample is a silty sand with a hydraulic conductivity k=5x10-3 cm/sec. and a moisture content of 18.5%. Specific gravity of soil sample is 2.70. Determine the discharge (m3/sec) of water.
9) A well is located in a confined aquifer near the intersection of a constant head and impervious boundary. a) Estimate the steady state drawdown in the well for Q=2 ft³ s, rw = 1 ft, distance from the well to stream= 300ft and distance from well to impervious boundary= 150 ft. T = 0.14ft²/s b) Estimate the steady state drawdown at point P located midway between the well and the steam. The angle between the stream and the impervious boundary is 90°
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 underlies an unconfined aquifer as shown. Compute the equivalent horizontal coeff. of permebility Compute the hydraulic gradient Compute the flow rate from one stream to another per meter width
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. ●

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