Repeat Problem 8.66 with the assumption that the branch line is open so that half of the flow from the tank goes into the branch, and half continues in the main line.

Problem 8.66

The pressure at section (2) shown in Fig. P8.66 is not to fall below 60 psi when the flowrate from the tank varies from 0 to \(1.0 \mathrm{cfs}\) and the branch line is shut off. Determine the minimum height, \(h\), of the water tank under the assumption that

(a) minor losses are negligible,

(b) minor losses are not negligible.

Figure P8.66

10 ft h All pipe is 6-in.-diameter plastic (e/D=0), flanged fittings 6 ft T 600 ft with 15 90 elbows Branch line (2) Main line 900 ft