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a layer of sand 4 m thick, overlies a layer below permeability clay, 5m thick. the bulk unit weight of the sand is 16.5 KN/m^3 and its saturated unit weight is 18 KN/m^3. the saturated unit weight of the clay is 21 kN/m^3. the water table exist initially at 1m below the ground level but pumping will permanently and rapidly lower the water talbe to 3.0m below the ground level. determine the effective stress at the top, middle and bottom of the clay;
1. before pumping
2. immediately after lowering the water table
3. in the long term.
determine the change in effective stress in the clay caused by the pumping.
A lake with a surface area of 1050 acres was monitored over a period of time. During a one month period, the inflow was 33 cfs, the outflow was 27 cfs, and a 1.5 in seepage loss was measured.
determine the stresses in the steel and concrete under the service loads
how to find degree of kinematic indeterminacy
A 15kg Block rests on top of a 25kg Block which is subject to a 400N force. Block B sits on a table. the Coeffiecents of friction are the same for all surfaces, u(s) is .4 and U(k) is .3. The force is Applied to the bottom block ( with no inclinat..
Find the minimum flow rate of air and the heat exchanger second-law efficiency.
A company facing an interest rate of 8% must choose among projects offering the following four-year cash flows. If the company is employing the net present value criterion, which project should they choose
determine the velocity and acceleration of point C of the belt, (a) immediately before the power is turned off. (b) 9 s later.
The total dissolved inorganic carbon (TIC) of a sample of groundwater is 8.33 mM. The temperature of the aquifer is 15C, the pH is 7.5, and the ionic strength is 0.05 M. What is the H2CO3, HCO3-, CO3 2-, and the partial pressure of CO2? [Use activ..
The maximum vertical load and horizontal load have been identified and shown in the figure. Under this loading condition, you are asked to determine the horizontal deflection of joint C.
If direct runoff hydrgraph derived from a unit hydrograph of a catchment (drainage area = 50 acre) is 120 acre-ft, back calculate the rainfall amount. Assume total abstraction in the area is 50%.
What is the minimum distance from the stalled car at which the driver could apply the brakes and still stop before hitting it? Assume coefficient of rolling resistance of 0.013.
A rectangular channel 5 m wide carries a discharge of 10 m^3/s at a uniform depth of 3 m. The channel is running on a slope of 0.0025 m/m. Estimate wall shear stress and friction velocity. Assume the density of flowing water as 1000 kg/m^3.
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