wake

drag

lift

boundary layer

unity

greater than unity

greater than 2

greater than 4

crest

nappe

sill

weir top

steady flow

unsteady flow

laminar flow

uniform flow

the direction and magnitude of the velocity at all points are identical

the velocity of successive fluid pai-ticles, at any point, is the same at suc¬cessive periods of time

the magnitude and direction of the velocity do not change from point to point in the fluid

the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plsr.e