Determine the seepage through the homogeneous earthen dam section shown below, if coefficient of permeability of soil material of dam is 5 x 10-4 cm/sec. 10m Free Board = 2.0m 20m 2.5 Horizontal Filter 30m- 36.50 m
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- A concrete dam retains water to a height of 9 m. It has rows of sheet piling at both heeland toe which extend half way down to an impervious stratum. From a flow net sketchedon a transformed section, it is found that there are four flow channels and sixteen headdrops. The average horizontal and vertical permeabilities of the soil are 6 × 10^–3 mm/sand 2 × 10^–3 mm/s, respectively. What is the seepage in cubic meter per day, if the lengthof the dam is 150 meters?In a constant head permeameter with cross section area of 10cm2 when the flow was taking placeunder a hydraulic gradient of 0.5. the amount of water collected in 60seconds is 600cc.find thepermeability of soil..An oil tank is to be sited on a soft alluvial deposit of clay. Below the soft clay is athick layer of stiff clay. It was decided that a circular embankment, 10 m diameter,with wick drains inserted into the soft clay would be constructed to preconsolidateit. The height of the embankment is 6 m and the unit weight of the soil comprisingthe embankment is 18 kN/m3. The following data are available: thickness of softclay = 7 m, ks = 1 × 10−10 m/s and Ch = 0.6 m2/yr. The desired degree ofconsolidation is 90% in 12 months. Determine the spacing of a square grid of thewick drains. Assume wick drain of size 100 mm × 3 mm and qw = 0.1 × 10−6 m3/s.The flow point distance is 4 m. Assume a half-closed system.
- Water fl ows in a brickwork rectangular channel 2 m wide,on a slope of 5 m/km. (a) Find the fl ow rate when thenormal depth is 50 cm. (b) If the normal depth remains50 cm, fi nd the channel width which will triple the fl owrate. Comment on this result.Find the rate of flow in m3/sec/m through the permeable soil layer. Given: H = 5.5 m, H1 = 2 m, h = 3.5 m, S = 40 m, a = 17°, and k = 0.085 cm/sec.A drainage pipe beneath a dam has clogged with sand whose coefficient ofpermeability is found to be 8.0 meters per day. The average difference inheadwater and tailwater elevation is 21.6 meters and it has been observed thatthere is a flow of 162 liters per day through the pipe. The pipe is 96.3 meterslong and has a cross-section area of 180 sq. cm. What length of the pipe isfilled with sand?
- In a constant head permeameter with cross section area of 10cm2 when the flow was taking place under a hydraulic gradient of 0.5. the amount of water collected in 60seconds is 600cc.find the permeability of soil.A deposit of cohesionless soil with a permeability of 0.3 mm/s has a depth of 12 m with impervious ledge below. A sheet pile wall is driven into this deposit to a depth of 8 m. The wall extendsabove the surface of the soil, and a 3 m depth of water acts on one side. Sketch the flow net and determine the seepage quantity. a. 600 ml/s/meter length b. 300 ml/s/meter length c. 1200 ml/s/meter length d. 900 ml/s/meter lengthEarth is required to be excavated from the borrow pits for buildingembankment as shown in the figure. The moisture unit weight ofthe borrow pits is 18 kN/m3 and its water content is 8%. Estimatethe quantity of earth required to be excavated per meter length ofembankment. The dry unit weight required for the embankment is15 kN/m3 with a moisture content of 10%. Assume the specificgravity of the solids as 2.67. Also determine the degree ofsaturation of the embankment and volume of the water in theembankment
- Q- If a soil has a voids ratio of 0.68 and water percolating through it has a discharge velocity of 1.35*10-2cm/s. Calculate its seepage velocity.Q#4 : For the concrete Dam shown in figure, determine the total average seepage for the given permeable strata by drawing Flow Net. The detail dimensions are given on the figure. The head of water on upstream side is 6ft and on downstream side is 1ft. Assume of Nf= 3, Nd= 6 and rectangular flow elements. Use MSpaint or graph paperFor 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.0.045