The flowrate between tank \(A\) and tank \(B\) shown in Fig. P8.115 is to be increased by \(30 \%\) (i.e., from \(Q\) to \(1.30 Q\) ) by the addition of a second pipe (indicated by the dotted lines) running from node \(C\) to tank \(B\). If the elevation of the free surface in tank \(A\) is \(25 \mathrm{ft}\) above that in \(\operatorname{tank} B\), determine the diameter, \(D\), of this new pipe. Neglect minor losses and assume that the friction factor for each pipe is 0.02.

Figure P8.115

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6-in. diameter; 600 ft long 6-in. diameter; 500 ft long Diameter D, 500 ft long B