A differential manometer connected to pipes A and B carrying liquids of specific gravity 0.90 and 0.80 respectively. Point B is 0.80 m below A. If the mercury level in the left limb is 0.20 m below A and the difference in levels of mercury in the two limbs is 0.95 m, find the pressure difference between A and B.

Refer to Figure 7.24. The following data were collected during the field permeability measurement of a confined aquifer using a pumping test. Determine the hydraulic conductivity of the permeable layer. Use Eq. (7.49). Thickness of the aquifer, H = 4.5 m Piezometric level and radial distance of the first observation well: h1 = 2.9 m; r1 = 17.8 m Piezometric level and radial distance of the second observation well: h2 = 1.8 m; r2 = 8.1 m Rate of discharge from pumping, q = 0.5 m3/min

Bourdon-type pressure gauges are used in thousands of applications. A deadweight tester is a device that is used to calibrate pressure gauges. Investigate the operation of a deadweight pressure tester. Write a brief report to discuss your findings.

For Problems 11.11, 11.12, and 11.13, calculate the U-factors.