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Spillway discharges heavy flood water during monsoon season and is an
essential part of a dam. While selecting the dam site, choice of spill section will
decide about the type of dam. Generally in concrete gravity dam a separate
spillway is constructed.
In case of requirement of large spillway section, overflow concrete
gravity dam is to be constructed. If the discharge from the spillway is small and
suitable location for spillway site is available it needs to be selected along the
major river section with concrete overflows section in the middle of the main
dam.
Distribution of Water
Distribution of surface water is mainly from the river or storage like dams and
effected by irrigation canals.
Main uses of water are for :
1) Irrigation
2) Industry
3) Water supply for drinking water.
Irrigation Canals
Canals are artificially excavated channels designed to carry water of required
discharge from any river or head works of dams. Such canals are classified
according to the discharge as under :
a) Main canal
b) Branch canal
c) Major distributary
d) Minor distributary
e) Water course
f)
Field channel
