Calculate the water discharge through two aquifers that have similar dimensions (30 mthick, 1.5 km wide, 1m/km potentiometric surface). Aquifer 1 is gravelly with a permeability of 0.042m/s while Aquifer 2 is mostly silty sandstone with a permeability of 4.2x104 m/s.Permeability(m/sec)Aquifer 1Ah/AlCross sectional Area(m²)Water DischargeAquifer 2

The problem is asking us to calculate the water discharge through two aquifers with similar…

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Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A confined aquifer shown has hydraulic conductivity of 52 m/day with void ratio of 0.282. The average thickness is 30 m and the average width is 4 km. el = 85 m el = 55 m 80 m aqulfer 1400 m Determine the nearest value of the tirne of travel from the head of aquifer to a point 5.2 km downstream in days (in a whole day).
An artesian aquifer 25-m thick has a porosity of 17% and bulk modulus of compression 2400 kg/ cm?. Estimate the storage coefficient of the aquifer. What fraction of this is attributable to the expansibility of water ? Bulk modulus of elasticity of water = 2.14 × 104 kg/cm². Ans: (0.00106, 1.87%)
3
A permeability pumping test was carried out in a confined aquifer with the piezometric level before pumping is 2.11 m. below the ground surface. The aquiclude (impermeable layer) has a thickness of 5.94 m. measured from the ground surface and the confined aquifer is 7.6 m. deep until it reaches the aquiclude (impermeable layer) at the bottom. At a steady pumping rate of 14.9 m³/hour the drawdown in the observation wells. were respectively equal to 1.61 m. and 0.43 m. The distances of the observation wells from the center of the test well were 16 m. and 32 m. respectively. Compute the depth of water at the farthest observation well. Compute the coefficient of permeability in mm/sec. Use 4 decimal places.
Which of the following are characteristics of an unconfined aquifer. Select all that apply. Pore spaces are 100% filled with water. An artesian well results from digging into this aquifer. This aquifer is sandwiched between two impermeable layers. This aquifer can reach the ground surface if the water table depth is already shallow.
Explain why the bottom of the aquifer is always used as the datum for head calculations when dealing with unconfined aquifers.
6. Two observation wells have been constructed in the confined aquifer shown below. If the flow rate (Q) is 0.01 m³/hr/unit width, Porosity, n= 0.26, effective porosity=0.23 and and compressibility of aquifer matrix is a = 10-8 ms2/kg: compressibility of water, B = 45.8 x10 11N/m² i. ii. lii. 20 m K₁-15 miday 300m K₂-7 K₁-10 m/day Determine K2 what is the effective hydraulic conductivity (K) for the system Calculate transmissivity and Storativity
Groundwater hydrology
Water flows through three confined aquifers in a series as shown below. The piezometric head in the observation wells are 166.4 and 86.6 ft. Determine the flowrate per unit width within the aquifer. Determine the headloss within each component of the aquifer
A confined aquifer with two piezometers measuring pressure head at two different locations 1500 ft apart. The aquifer has hydraulic conductivity of 2.4 x 10-4 ft/sec. Assume the width of aquifer into the page is 6 miles and the flow is one dimensional from left to right. Compute the total flow in ft³/sec. el. 282 ft 10.5 ft -1500 ft el. 276 ft Aquiclude Confined aquifer Aquiclude
3c,d,e
A dam, shown in Figure 5 retains IO m of water. A sheet pile wall (cutoff curtain) on theupstream side, which is used to reduce seepage under the dam, penetrates 7 m into a 20 mthick silty sand stratum. Below the silty sand is a thick deposit of clay. The averagecoefficient of permeability of the silty sand is 2.0 x 10-4 cm/sec. Assume that the siltysand is homogeneous and isotropic.(i) Draw the flow net under the dam.(ii) Calculate the seepage rate, q per meter length of the sheet pile.

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