(Solved): The water flow rate between tanks A and B in the figure below is to be increased by 25% (from Q to ...

The water flow rate between tanks $$A$$ and $$B$$ in the figure below is to be increased by $$25\%$$ (from $$Q$$ to $$1.25Q$$ ) by the addition of a second pipe, as shown by the dotted lines running from point $$C$$ to Tank $$B$$. If the elevation of the free surface in $$\mathrm{tank}A$$ is $$35\mathrm{ft}$$ above that in $$\mathrm{tank}B$$, find the diameter, $$D$$, of this new pipe. Neglect the minor losses. The friction factor for the original pipe is $$0.015$$, and for the added pipe is $$0.025$$. Problem 7