Three reservoirs A, B and C are interconnected by pipes as shown in the given figure, Water surface elevations in the reservoirs and the piezometric level at the junction D are also indicated in the figure
Flows Q1, Q2 and Q3 are related as
1
Q1 + Q2 = Q3
2
Q1 - Q2 = Q3
3
Q2 - Q1 = Q3
4
Q1 + Q2 + Q3 = 0