Calculate the diameter (mm) of a discrete particle whose terminal settling velocity is 1.044 cm/s. The particle density is 2.65 g/cm³ and the water temperature is 12 C. Assume Stokes' law applies and that the density and viscosity of water are 1.0 g/cm³ and 1.235 mPa-s, respectively.

A sand has Gs = 2.66. Calculate the hydraulic gradient that will cause boiling for e = 0.35, 0.45, 0.55, 0.7, and 0.8.

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