A well 12-in diameter penetrates 108 ft below the static water level. After a long period of pumping at a rate of 350 gpm, the drawdown in the well 57 ft and 148 ft from the pumped well is found to be 12 ft and 7.4 ft, respectively. What is the transmissivity of the aquifer

Amixture of slurry and mud is to be pumped through a horizontal pipe of diameter 500 mm. the fluid behaves as a bingham plastic with a yield stress of 30 pa and viscosity 0.04 pa.s. describe the effects of the shear stress through a transverse section of the pipe by plotting the variation in shear stress and velocity profile: (i) just before the slurry starts to move (ii) as the slurry flows when the pressure gradient is double that in part (i)