In water distribution networks, the Hardy Cross method uses which fundamental principle to balance loop flows?
AConservation of momentum in each pipe
BAlgebraic sum of head losses around any closed loop must equal zero (Sum hf = 0)
CVelocity head must remain constant
DReynolds number must be identical in all branches
Explanation
Hardy Cross method enforces two conditions: (1) Total inflow = total outflow at each node, and (2) Sum of head losses around any closed pipe loop is zero.

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