In every exercise, you must highlight your main assumptions, highlight the given data and unknowns, draw a sketch, present your equations in full form, and specify the units in every step. A brief discussion of your findings is encouraged.

Water at 70 F flows by gravity from a larger reservoir at a high elevation to a smaller one through a 120-ft-long, 2-in-diameter cast iron piping system that includes four standard flanged elbows, a well-rounded entrance, a sharp-edged exit, and a fully open gate valve. Taking the free surface of the lower reservoir as the reference level, determine the elevation ! of the higher reservoir for a flow rate of 10 ft3 /min.