The tank in the figure between a where the depth is 20 ft and b where the depth is 4 ft is a frustum of a paraboloid with vertical side axis. The elements between a and b follow the curve x² = 9h, the origin being in the plane of the orifice. The orifice is sharp- edged, 4 in. in diameter, with Cd = 0.607. Compute the time required for the liquid level he in the tank to drop from a to b. 6

For the drilled shaft described in Problem 19.7, estimate the total elastic settlement at working load. Use Eqs. (18.45), (18.47), and (18.48). Assume that Ep = 20 106 kN/m2, s = 0.3, Es = 12 103 kN/m2, = 0.65 and Cp = 0.03. Assume 80% mobilization of skin resistance at working load. (See Part c of Problem 19.7) 19.7 Figure 19.16 shows a drilled shaft without a bell. Here, L1 = 6 m, L2 = 7 m, Ds = 1.5 m, cu(1) = 50 kN/m2, and cu(2) = 75 kN/m2. Find these values: a. The net ultimate point bearing capacity. Use Eqs. (19.23) and (19.24) b. The ultimate skin resistance. Use Eqs. (19.26) and (19.28) c. The working load, Qw (FS = 3) FIG. 19.16

Why is it so difficult to process MSW?