The seepage occurring through an earthen dam is represented by a flow net comprising of 10 equipotential drops and 20 flow channels. The coefficient of permeability of the soil is 3 mm/min and the head loss is 5 m. The rate of seepage (expressed in cm³/sec per m length of the dam) through the earthen dam is

The seepage occurring through an earthen dam is represented by a flow net comprising of 10 equipotential drops and 20 flow channels. The coefficient of permeability of the soil is 3 mm/min and the head loss is 5 m. The rate of seepage (expressed in cm³/sec per m length of the dam) through the earthen dam is

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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The seepage occurring through an earthen dam is represented by a flow net comprising of 10 equipotential drops and 14 flow channels. The coefficient of permeability of the soil is 3 mm/min and the head loss is 4 m. The rate of seepage through the earthen dam is cm³/s per m length of dam.
of permeability. If entrance angle The figure below shows two flow lines for seepage across an interface between two soil media of different coefficients a, = 30°, the exit angle a, will be k, = 1.0x10"m/s k, = 4.0x10"m/'s a,
The seepage occurring through an earthen dam is represented by a flownet comprising of 10 equipotential drops and 20 flow channels. The coefficient of permeability of the soil is 3 mm/min and the head loss is 5 m. The rate of seepage (expressed in cm³/s. per m length of the dam) through the earthen dam is
The permeability of sand in horizontal and vertical directions are 3 × 10- 3 cm/sec and 1 x 10-3 cm/sec and the permeability of clay in horizontal and vertical directions are 9 x 10-7 cm/sec and 3 × 10-9 cm/sec, then the ratio of X seepage Loss per meter length of dam in sand to clay is:
The section through a long cofferdam is shown below, the coefficient of permeability of the soil being 6x10-8 m/s. Determine the quantity of seepage entering the cofferdam. 5.50 m 0 1 2 3 4 5 1 As = 0.70 ml B to 10 15 m
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
The section through a long cofferdam is shown below, the coefficient of permeability of the soil being 6x10-8 m/s. Determine the quantity of seepage entering the cofferdam. 5.50 m I 0 1 2 3 4 5 As = 0.70 ml +cl 10 B ax 15 m
For the figure shown below, if the area of the tank is 0.5 m² and hydraulic conductivity of sand is 0.1 cm/sec. a. What is the magnitude and direction of the rate of seepage? b. If the value of h=1.2m, will boiling occur? Why? c. What should be the value of "h" to cause boiling? Outflow Inflow 1m 2m A B h = 1.2m e = 0.55 G=2.68 Valve (open)
f Example Arectangular Sedimentation bank with an area a 200m² treats treats a flow of 16.000 m³/day. The water entering the tank Contains a substantial number of clay agglomerates with specific gravity of 1.2 and a diameter of 0.07 mm. what percentage of these Particals will be removed in the sedimentation tank ? and P= loookg/m M = 1·002 × 10³ kg/m.s 19 3
An unconfined aquifer is 100 feet thick was evaluated using a field pumping test. The depth to groundwater is 10 feet. At a distance of 1000 feet, the drawdown was 40 feet, and at a distance of 5000 feet it was 20 feet. Find the permeability of the aquifer assuming that a steady-state of 960 gal/minute during the test in ft/sec.
3. A sediment laden water is to be treated in a sedimentation tank with Type I settling characteristics. The tank is 35 m. long and 20 m. wide with a depth of 5 m. A controlled constant flow rate of 3.5 m³/s passes through the tank. A particle size analysis has been made and the results are listed in the table below: Dp (m) 0.00005 0.00007 0.00009 0.0001 0.0002 Mass Concentration (mg/L) 100 200 300 200 100 Assume that the particle densities are all 2,000 kg/m³ and the dynamic viscosity of water is 0.001 Ns/m². (a) Determine the effluent particle size distribution and the effluent sediment concentration by using a spreadsheet or writing a QuickBASIC program. (b) Determine the particle removal efficiency (%) of the tank.
Problem 1. A confined aquifer has two monitoring wells spaced 500 m apart along the direction of the groundwater flow. The difference in the water level in the wells is 2.0 m. The hydraulic conductivity of the sediment is 50 m/day. The retardation factor is 3. 1. Calculate the Darcy velocity. 2. The porosity of the sediment is 0.35. What is the actual velocity of groundwater flow? 3. How long would it take for the contaminant to travel 1 mile (1607 m)?