Hydraulics and Fluid Mechanics in ME
Stanton diagram is a

log-log plot of relative roughness against Reynolds number
semi-log plot of friction factor against relative roughness
semi-log plot of friction factor against Reynolds number
log-log plot of friction factor against Reynolds number

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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

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

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