Water at 70°F flows by gravity from a large reser voir at a high elevation to a smaller one through a 60-ft-long, 2-in-diameter cast iron piping system that includes four stand ard 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 ele vation z1 of the higher reservoir for a flow rate of 10 ft3/min.
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