Khawaja Zaheer Ahmed - PDMA

2) Deposits of water-borne material as in a reservoir, on a
delta or on overflowed lands.
Sluice A water channel that is controlled at its head by a gate.
Also, a conduit for carrying water at high velocity; an
opening in a structure for passing debris; to cause water to
flow at high velocities for wastage for purposes of
excavation, ejecting debris; etc.
Spur In irrigation practice, a projection into a stream, provided
with an armoured head; the head may be of various
shapes.
Time lag Is the allowance that has to be made for time required for
the effect of changes in indent at one site reaching another
indenting site. The time elapsing between the occurrence
of any alternation of discharge or level at toe point on the
river and its occurrence at another point. Time lag is
generally measured by timing the passage of a peak or
trough between two points varies inversely with the
magnitude of the discharge, for even the same order of
discharge, it is different on the failing stage from its value
on the rising stage on account of the difference in the
slopes of the river.
Wave-wash The damage done to bunds when, on account of strong
wind velocity, the flood water forms waves which mount
and strike and splash on their upstream face unless
counteracted by jungle or other artificial device.
Weir A fall extending across river or canal usually provided with
a raised crest and glacis.
Wetting Channel A device used for soaking or preparing a bund in advance
of the main rise of the river, for its task of holding back the
river. It refers to both (a) a gravity channel from the river lip
to the bund and (b) the channel between the trench bund
and the main bund through which water is pumped to soak
the main bund.
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