Question

Problem 2

A 30,000 litre water tank has a 4.30 m internal diameter. It has two outlet pipes, one at the base of the tank and one higher up. The distance between the two outlets means that when the water level is at the height of the upper pipe there is still 8,000 litres of water remaining in the tank for fire-fighting if needed. The top portion of the tank is used for stock drinking water.

a) If the tank is holding 27,000 litres of water at the moment, what is the velocity of the water coming each of the taps when each is initially opened? Assume both taps are the same size.

b) By attaching a hose with a smaller area on the upper outlet you can get the water coming out to have the same velocity as that of the lower outlet. What is the ratio of the internal diameter of the hose on the upper outlet to the “no hose” bottom outlet pipe?

A diagram of the tank and information about tanks can be found at the following websites.

http://www.rainwatertanksdirect.com.au/water-tanks/large-tanks.php

Answer 1

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