A pumping system has a static lift of 15 m. The pump characteristics are listed below, together with the total losses in the rising main (velocity head can be neglected). Determine the flow rate, head delivered, and power supplied to the pump at the operating point. If the diameter of the rising main is 250 mm, are conditions suitable for scouring of deposited solids? If the rising main became rougher with age, would the flow rate, and head, increase or decrease? 3. For the same system as above, if an additional identical pump is operating in parallel, determine the total flow rate, head delivered, and power supplied to the pumps at the operating point. What arrangement, one pump or two in parallel, uses power more efficiently?