A concrete pipe of 6 m long is used to block flood water from the left to contaminate a pond of oil on the right. If the flood water has a specific gravity of SG=1.6 and the oil's SG=0.8, find the magnitude and direction of the resultant force.
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- 12. For the Dam shown in the figure a) Draw the flow net in the soil under the dam b) Calculate q per unit width c) State the assumptions associated with the use of flow nets calculations. 100 m 50 m asl V Dam K = 10-4 ms¹ ImpermeablQ3 Figure Q3 shows a flow net for flow through a weir, the base of which is 2m below the ground surface, in a permeable soil layer. Given that the coefficient of permeability =k = 5×10-³ cm/sec, determine the following: - 14 m 7 m 8 m 2 m 10 m kx = k, = k Impermeable laye Figure Q3 a) Total head (m) at point a, b, c, d, e, and f. b) Uplift pressure (or water pressure, kPa) at point a, b, c, d, e, and f. c) The total rate of seepage per unit length through the permeable layer. d) The approximate average hydraulic gradient at point f.Q3 Figure Q3 shows a flow net for flow through a weir, the base of which is 2m below the ground surface, in a permeable soil layer. Given that the coefficient of permeability = k = 5x103 cm/sec, determine the following: 14 m 7 m 8 m a bc d e' f' 10 m k, = k. = k Impermeable laye Figure Q3 a) Total head (m) at point a, b, c, d, e, and f. b) Uplift pressure (or water pressure, kPa) at point a, b, c, d, e, and f. c) The total rate of seepage per unit length through the permeable layer.
- Question 25 In laminar flow, which is correct? BJ: higher Re value has higher friction factor JB: lower Re value has higher friction factor BJ is true and JB is true BJ is false and JB is false BJ is false and JB is true O BJ is true and JB is false31 Yuri wants to determine the permeability of an aquifer. The aquifer has a test well 300-mm in diameter with two observation wells. A pumping test was conducted for 24 hours with the discharge being held constant at 5,721.4 m^3/day. The first one, 81.07 meters from the test well, has a draw-down of 0.6 meters. The second one, 40 meters from the test well, has a draw-down of 1.43 meters.The static water table penetrates the well to a depth of 25 meters. Determine the radius of influence of the aquifer in meters. Round off to three decimal places.In a homogenous earth dam, total head loss through the soil is 25m. The flownet drawn in the dam section consists of 7 flow lines and 14 potential drops. IF the dam is 1000m long and the permeability of the material of the dam is uniformly 5x10-3 m/sec. The Total discharge permeating through the body of dam will be
- A confined aquifer is 50 m thick and 0.5 km wide. Two observation wells are located 1.4 km apart in the direction of flow. Head in well No. 1 is 50m and in well No. 2 is 42m. Hydraulic conductivity is 0.7 m/day. Effective porosity is 25%. A ship carrying chemicals sank near the observation well no 1 and chemicals somehow reach the groundwater. How long it will take forthe chemicals to reach Well no 2?An unconfined aquifer is 10 m thick and is being pumped so that one observation well placed at a distance 76 m shows a drawdown of 0.5 m. On the opposite side of the extraction well is another observation well 100 m from the extraction well, shows a drawdown of 0.3 m. Assume the coefficient of permeability of 50 m/day. a.) What is the discharge f the extraction well? b.) Suppose the well at 100 m from the extraction well is now pumped. Show with a sketch what this will do to the drawdown. c.) Suppose the aquifer sits on an aquaclude that has a slope of 1/100. Show with a sketch what this will do to the drawdown.3- Most hydraulic structure designs depends on: a- the firm flows in the river b-the maximum flows in the river flood discharges of 30 years at least e- all are false c- the extreme floods in the river d- the average 4- The spillway of a dam has a service life of 100 years. A tisk of 8% for the failure of the structure has been considered. For what return period should the spillway capacity be designed? a- 1460 ycars b- 1205 years c- 20 years d-83 ycars c-all are false
- Problem 1. The total head loss from A to D is 14 m. a. Calculate the discharge at pipeline 3. b. Calculate the discharge at pipeline 4. c. Calculate the discharge at pipeline 5. nz = 0.012 D2 = 0.20 m L=300 m A B D 3 fi=0.02 D = 0.30 m L = 500 m n =0.013 D, = 0.25 m L = 250 m C; 120 D5 = 0.40 m s = 300 m 4) n4 -0.015 D, = 0.35 m = 300 mA section of a homogeneous earth dam is shown in the Fig.1. Calculate the seepage discharge per metre length, through the body of the dam. The coefficient of permeability of the dam material may be taken as 8 x 10-$ m/s. Apply 6. 4m Free board 2m 2:1 14m 12 m 2-5:1The dam and flow net shown in the attached picture. The dam is 120 m long and has two 10 m sheet piles driven partially into the granular soil layer. Datum is at tailwater elevation. Determine: 1. The quantity of seepage loss under the dam when k= 20*10^(-4) cm/s 12 m 10 m sheet pile 10m sheet pille 85m 30 m Impervious - O C 0.4 1 Scale: Number al equipotential drops