The flow net under a hydraulic structure has 5 flow channel with 10 equipotential drops. If the permeability of the bed material is 1.5 *10^ -4 m/sec, find the quantity of seepage per meter width of the structure in m ^ 2 /sec under 3m head.
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- A permeability pumping test was carried out in a confined aquifer with the piezometric level before pumping of 2.18m below the ground surface. The aquiclude has a thickness of 5.7m measured from the ground surface and confined aquifer is 7.6m deep until it reaches the aquiclude at the bottom. At a steady state pumping rate of 15.6 ?7??6?3/?2h?7??1? the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distances of the observation wells from the center of the test well were 15m and 32m respectively. The radius of the test well is 1m. Determine the coefficient of permeability (m/hr) Select the correct response: 2.15x10-5 0.215 0.597 5.97x10-5For a homogeneous earth dam 32 m high and 2 m free board, a flow net was constructed with four flow channels. The number of potential drops was 20. The dam has a horizontal filter at the base near the toe. The coefficient of permeability of the soil was 9 × 10^–2 mm/s. Determine the anticipated seepage in m^3/s, if the length of the dam is 100 metres. a.0.98 b.0.120 c.0.054 d.0.045The section through part of a cofferdam is shown in Figure 2.25, the coefficient of permeability of the soil being 2.0 × 10-6 m/s. Draw the flow net and determine the quantity of seepage. 2.00 m AVA 3.00 m 3.00 m 3.50 m Figure 2.25
- The actual velocity for flow in a soil deposit of porosity 0.33 is 1.39 mm/sec. The coefficient of hydraulic conductivity is 4.58 cm/s. Determine the coefficient of percolation. A 13.88 mm/s B 15.2 mm/s C 8.56 mm/s D 23 mm/sAn 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.P 4: A sand sample of 35cm2 cross sectional area and 20cm long was tested in a constant head permeameter. Under a head of 60cm, the discharge was 120ml in 6min. The dry weight of sand used for the test was 1120g, and G3=2.68. Determine (a) the hydraulic conductivity in cm/s, (b) the discharge velocity, and (c) the seepage velocity. Answers: a) 3.174 x 103 cm/s, b) 9.52 x 10³ cm/s, c) 2.36 x 10-² cm/s
- 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,Figure 1. shows a barrier system consisting of a primary leachate collection system, a primary clay liner with a hydraulic conductivity of 10° m/s underlain by a hydraulic control (HC) layer. It is assumed that the HC layer is kept free draining without significant build-up of head in this layer. Therefore, there is no head loss between point B and C. Underneath the HC layer there is 1.5m thick natural clay (secondary clay liner) with hydraulic conductivity of 5 x 10-10 m/s and an aquifer. a) Calculate the total head at A, B & D. b) Calculate the rate of flow per unit area for the secondary liner. c) Calculate the pore water pressure in kPa at point B 1.5 m DATUM 0.2 m Leachate Collection 1.2 m Primary Liner 0.1 m -Hydraulic Control k =0.1 m's 1.5 m Secondary liner Aquifer Fig 1. Barrier systemA permeability pumping test was carried out in unconfined aquifer with the piezometric level before pumping is 2.18m below the ground surface. The first permeable layer has a thickness of 5.7m measured from the ground surface and the unconfined aquifer is 7.0m deep until reaches the aquiclude at the bottom. At a steady pumping rate of 15.6m^3/hr the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distance of the observation wells from the center of the test well were 15m and 32m respectively. Compute the hydraulic conductivity?
- A permeability pumping test was carried out in unconfined aquifer with the piezometric level before pumping is 2.18m below the ground surface. The first permeable layer has a thickness of 5.7m measured from the ground surface and the unconfined aquifer is 7.0m deep until reaches the aquiclude at the bottom. At a steady pumping rate of 15.6m^3/hr the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distance of the observation wells from the center of the test well were 15m and 32m respectively. If the hydraulic gradient is 0.0092 determine the seepage velocity at 0.25 void ratio?A permeability pumping test was carried out in unconfined aquifer with the piezometric level before pumping is 2.18m below the ground surface. The first permeable layer has a thickness of 5.7m measured from the ground surface and the unconfined aquifer is 7.0m deep until reaches the aquiclude at the bottom. At a steady pumping rate of 15.6m^3/hr the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distance of the observation wells from the center of the test well were 15m and 32m respectively. Compute the Transmissibility?Determine the following: a) hydraulic conductivity is ______ x10^3 cm/sec b) Transmissbility of the impermeable layer is _____ cm^2/sec c) The drawdown in the test well is ____ m