Hydraulics and Fluid Mechanics in ME
A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if

Loss of head and velocity of flow in both the pipes is same
Loss of head and discharge of both the pipes is same
Diameter of both the pipes is same
Length of both the pipes is same

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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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