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…

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter8: Stresses In A Soil Mass

Section: Chapter Questions

Problem 8.14P

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Refer to Figure 7.24. The following data were collected during the field permeability measurement of a confined aquifer using a pumping test. Determine the hydraulic conductivity of the permeable layer. Use Eq. (7.49). Thickness of the aquifer, H = 4.5 m Piezometric level and radial distance of the first observation well: h1 = 2.9 m; r1 = 17.8 m Piezometric level and radial distance of the second observation well: h2 = 1.8 m; r2 = 8.1 m Rate of discharge from pumping, q = 0.5 m3/min
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.
For a typical sand and gravel aquifer, estimate the one-year travel distance for water when the hydraulic gradient is 0.0003 m/m.
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
An unconfined aquifer exists where a buried river channel cut into underlying impermeable bedrock. The figure below shows the orientation and pertinent dimensions. The flow rate at the pumping well is 250 gpm, and its radius of influence is 1000 ft. The hydraulic conductivity of the aquifer is 15 ft/d, and the initial saturated thickness is 120 ft. Find the drawdown at the observation well under equilibrium conditions.
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.
Given: velocity of flow = 0.0375 m/s coefficient =0.05 m/s porosity p =48% slope S = 3/4 The soil porosity in the area where the 46-cm diameter well is 48%, find the discharge of the groundwater. Given the coefficient =0.05 m/s and porosity p =48%, find the transmissibility (T) in m/s per unit m, if the aquifer width is 1.2 m. Given the discharge Q get in Question #1, transmissibility T in Question#2, slope S = 3/4; find the aquifer width X.
Given the coefficient k =0.05 m/s and porosity p = 48%, find thetransmissibility (T) in m/s per unit m, if the aquifer width is 1.2 m.Formula: - It is the flow rate per day thru a unit areaunder a unit hydraulic gradient For an aquifer with thickness, Band width, X:T = K*B and Ag = BXThus: Q = (T*X*S)
The aquifers wherein the groundwater flows has a cross-sectional area of 10,000 m^2 and a length of 1,500 m. Hydraulic heads are 250 m and 300 m at the groundwater exit and entry points in the aquifer, respectively. If the groundwater discharges into a stream is at the rate of 50 m^3/month: a. What is the Darcy's velocity per day? b. Determine the hydraulic gradient? c. Determine the hydraulic conductivity per day?
In a field testing, the hydraulic gradient between two peizometers is 1.11, the area of flow is 4.08 m2 and the hydraulic conductivity of the aquifer material is 0.94 m/day, calculate the discharge in m3/day. Note that discharge cannot be negative
A confined aquifer is recharged by a continuous supply of water from the certain source. The average thickness of the aquifer was determined to be 25 m and the average width is 4 km. The hydraulic conductivity of the aquifer was obtained at 40 m/day and its void ratio is 0.3333. The piezometer heads in two wells 1.325 km apart are 65 meters and 60 meters from a common reference datum. Determine the rate of flow in cubic meters per day.
The following figure shows and inclined aquifer at 100 to the horizontal. The difference in water level between to observation points of 60 m is 5 m. Determine the discharge through the aquifer per unit width if k = 0.7 mm/sec. The depth of aquifer normal to the direction of flow is 2.95

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