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A 4 branch pipe is equivalent to DN15, its pipe specific resistance is S=8809000 and a pressure of 3 kg is equivalent to a water depth of 30 m. The height difference at the two ends of the pipe is H = 30 m, and the length L of the pipe must be known to calculate the flow rate.

Flow rate Q = [H/(SL)]^(1/2)

The flow rate is also linked to the length of the pipe:

When the pipe length L=10 m When the flow rate is Q=[H/(SL)]^(1/2)=[30/(8809000*10)]^(1/2)=0.00058 m^3 / s ; the water flow is 2.09 cubic meters per hour.

When the pipe length L=100 m, the flow rate is Q=[H/(SL)]^(1/2)=[30/(8809000*100)]^(1/2 ) =0.00018 m^3/s; the water flow is 0.66 cubic meters per hour. 12 hours is 7.92 tonnes of water.