Hydraulics and Fluid Mechanics in ME
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by

dQ/Q = (dH/H)
dQ/Q = (3/4) × (dH/H)
dQ/Q = (1/2) × (dH/H)
dQ/Q = (3/2) × (dH/H)

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Hydraulics and Fluid Mechanics in ME
In case of flow through parallel pipes,

The head loss for all the pipes is same
The total discharge is equal to the sum of discharges in the various pipes
Both (A) and (B)
The total head loss is the sum of head losses in the various pipes

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