6. Two observation wells have been constructed in the confined aquifer shown below. If the flowrate (Q) is 0.01 m³/hr/unit width, Porosity, n= 0.26, effective porosity=0.23 and andcompressibility of aquifer matrix is a = 10-8 ms2/kg: compressibility of water, B = 45.8 x1011N/m²i.ii.lii.20 mK₁-15 miday300mK₂-7K₁-10 m/dayDetermine K2what is the effective hydraulic conductivity (K) for the systemCalculate transmissivity and Storativity

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 11N/m2 of aquifer matrix is a = 10-8 ms2/kg; compressibility of water, B = 45.8 x10 i. 15 miday 300m K-7 600 m X-10 m/day Determine K2 what is the effective hydraulic conductivity (K) for the system Calculate transmissivity and Storativity

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 11N/m2 of aquifer matrix is a = 10-8 ms2/kg; compressibility of water, B = 45.8 x10 i. 15 miday 300m K-7 600 m X-10 m/day Determine K2 what is the effective hydraulic conductivity (K) for the system Calculate transmissivity and Storativity

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 7.22P: Refer to Figure 7.24. The following data were collected during the field permeability measurement of...

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Concept explainers

Principles of Seepage

In hydrology, when water flows down in a pore or crack of unsaturated soil due to gravity, the deep layer of soil is called seepage. It is the slow movement of water in the soil layer. Seepage is mainly found near hydraulic structures and is responsible for the stability of earthen-type hydraulic structures.

Question

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

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2. A well with a diam. of 0.6 m. is constructed in a confined aquifer as shown. The sand aquifer has a uniform thickness of 15 m. overlain by an impermeable layer with a depth of 35 m. A pumping test was conducted to determine the coefficient of permeability of the aquifer. The initial piezometric surface was 15 m. below the ground surface datum of the test well and observation wells. After water was pumped at a rate of 13 liters/sec. for several days, water levels in the wells stabilized with the following drawdowns, 6.4 m. in the test well, 3.7 m. in the observation well 10 m. from the test well and 2.4 m. in the second observation well at a distance 30 m. From these data, o Find the depth of water in the test well. • Calculate the permeability of the aquifer. O Compute the transmissibility of the impermeable layer. 71-30 Ground surface 20 15m Water Leve intern 72=10 Static water level observation wall -impermeable confined aquifer hi hr
7.22
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
1. 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 18 m and the average width is 8 km. The hydraulic conductivity of the aquifer was obtained at 60 m/day and its void ratio is 0.1586. The piezometer heads in two wells 2,145m apart are 128 meters and 188 meters from a common reference datum. Determine: •compute the rate of flow through the aquifer in m3/day •compute the seepage velocity in m/day •compute the time of travel from the head of the aquifer to a point 8 km downstream in days
From the figure shown, the thickness of permeable layer is 1.1m making an angle of 14 degrees with the horizontal. K= 4.87x10^-12 cm/sec. If the vertical thickness depth of the aquifer at point of the first piezometer (left) is 1.5m and the other point at second piezometer is 1.1m, determine the flow rate. h=1.4 m Direction impervious layer of seepage 3 m 14 1.1 m impervious layer L. 14
3. (Modified version of Problem 5.39 in the text). An unconfined sand aquifer with a surface area of 10,000 m? experiences a 1 m water level drop. The porosity and specific yield for the sand aquifer are given as 0.34 and 0.25, respectively. a. Calculate the volume of water that would be released from the aquifer. m3 b. How much water would remain in the drained portion of the aquifer?
An artesian well is pumping water from a confined aquifer (thickness = 12 m) at a flow rate of 0.024 m3/s. The piezometric surface is 50 m above the bottom of the confining layer. In two monitoring wells (no pumping) located 15 m and 150 m away from the pumping well, steady-state drawdowns of 4 m and 1 m are observed, respectively. What is the intrinsic permeability of the aquifer (assuming the groundwater temperature is 15 ).
Kindly give me right solution with step by step.
cademic) X = 4 km If aquifer hydraulic gradient, hydraulic conductivity and effective porosity are found to be 0.4, 0.5 m/day and 0.2 respectively, determine how long the contaminants have been in the aquifer (in years)? 1 year = 365 days %3D
A 0.3 m well has a 25 m long screen that covers the entire depth of an aquifer. The aquifer medium has an effective grain size of 1.5 mm. The well is pumped at a rate of 0.2 m³/s. Assess the validity of Darcy's law near the well. Assume, porosity = 0.25 (Dynamic viscosity of water at 20°C is 1.005*10-3 Ns/m2)
Subject: Geotechnical engineering - soil mechanics
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°