Water at 20°C is delivered from one reservoir to another through a long 8-cmdiameter pipe. The lower reservoir has a surface elevation z2 = 80 m. The friction loss in the pipe is correlated by the formula hloss ≈ 17.5(V2/2g), where V is the average velocity in the pipe. If the steady flow rate through the pipe is 500 gallons per minute, estimate the surface elevation of the higher reservoir.