wash load:
Suspended material of very small size (generally clays and
colloids) originating primarily from erosion on the land slopes of
the drainage area and present to a negligible degree in the bed
itself.
watershed:
See drainage basin.
waterway opening
Width (area) of bridge opening at (below) a specified stage,
width (area):
measured normal to the principal direction of flow.
weephole:
A hole in an impermeable wall or revetment to relieve the
neutral stress or pore pressure in the soil.
windrow revetment:
A row of stone placed landward of the top of an eroding
streambank. As the windrow is undercut, the stone is launched
downslope, thus armoring the bank.
wire mesh:
Wire woven to form a mesh; where used as an integral part of
a countermeasure, openings are of suitable size and shape to
enclose rock or broken concrete or to function on fence-like
spurs and retards.
lvii
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