IRRIGATION CANALS alignment & design

109 Pages·2017·37.63 MB·English

IRRIGATION CANALS
alignment & design
Ghanta Surender
Former Director(ITC) &
Senior Faculty Member
WALAMTARI
CANALS
Canal is an artificial channel constructed

on the ground to carry water to fields
from a river or tank or reservoir.
Canals can be classified as Permanent

canal (canal from dam/tank etc) and
Inundation canal (canal to take water
from river high stages) .
Classification of canals
Canals

Productive Canals Protective Canals
 
(Yields Revenue) (Relief canals in famine area)
Classification of canals based on
function
Canals

Irrigation Canals
Power Canals
Navigation Canals
Feeder Canals

Navigation canal of Ganga River
Classification of canals based on
Alignment
Canals

Ridge canals
Contour canals
Side slope canals
Ridge Canal
Contour Canal
Command Area
Gross Command Area: (G.C.A) Gross area that can

be irrigated by a canal is Gross Command Area. This
is defined by drainage area on eitherside .
Cultivable Command Area. (C.C.A) This is the

portion of area within G.C.A where irrigation is
possible. The area of ponds, mounds, towns, villages,
roads, forests etc are to be excluded from G.C.A to
get C.C.A