The pressure at section $(2)$ shown in the figure below is not to fall below $70$ psi when the flowrate from the tank varies from $0$ to $1\mathrm{.}0$ 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.

Assume $h_1-7ft,h_2=9ft,$ the entrance is sharp$-$edged.

$($a$)h=$

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