Hydraulics and Fluid Mechanics in ME
Coefficient of resistance is the ratio of

Loss of head in the orifice to the head of water available at the exit of the orifice
Actual discharge through an orifice to the theoretical discharge
Actual velocity of jet at vena-contracta to the theoretical velocity
Area of jet at vena-contracta to the area of orifice

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Hydraulics and Fluid Mechanics in ME
If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be

unpredictable
from reservoir A to reservoirs B and C
from reservoir B to reservoirs C and A
from reservoir C to reservoirs A and B

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