An elevated storage tank which is open to atmosphere as shown in figure 1 contain water at 27 C where the density and viscosity are given as 1000 kg/m and 8.51x 104 Pas respectively. The water flows out from the tank through a sharp entrance to the pipeline. The pipe network in the system consists of pipe A and B where the diameter of the pipes are 10 cm and 6 cm respectively. The outlet discharge rate at point 2 is required to be kept a minimum of 6.3 x 10 m/s. Pipe A Pipe B H: 9.3 m X: 40 m y: 4.5 m S: 15 m Figure 1 Storage tank pipeline network. Table A Friction loss coefficient for fitting or valve Type of fitting or Valve Friction Loss coefficient, Globe Valve, Wide Open 6.0 Elbow, 90 0.75 Gate Valve, Half Open 45 Return bend 1.5 a) By considering both major and minor loses, determine the vertical height W. Take the coefficient contraction Cc from pipe A to B as 0.4 and the relative roughness of both pipes as 0.6 mm. (20 marks) b) Due to dry season and drought the water level in the tank falls below the level as stated above. Suggest an improvement to the design so that the minimum flow rate at the outlet is being kept. Include justification to your suggestion (4 marks)