Hydraulics and Fluid Mechanics in ME
Capillary action is due to the

Surface tension
All of the listed here
Adhesion of the liquid molecules and the molecules on the surface of a solid
Cohesion of the liquid

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

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