Irrigation works : $b the principles on which their design and working should be based, with special details relating to Indian canals and some proposed improvementsBellasis, E. S. (Edward Skelton)
Science
Irrigation works : $b the principles on which their design and working should be based, with special details relating to Indian canals and some proposed improvements
Bellasis, E. S. (Edward Skelton)
Canals; Irrigation
3. =Remarks.= The Report on the Project estimates gives, for each tract,
remarks on its soil, rainfall, height of subsoil water, circumstances as
to existing irrigation from wells or small canals and liability to
floods. On a consideration of these matters the decision as to the
particular parts of the tracts which are to be irrigated and the areas
which are, in the rabi, to receive only restricted irrigation,
depends.[50]
[50] It is not unusual, in tracts where the level of the subsoil water
is high, say within 15 feet of the surface, to have some “kharif
distributaries.” These are closed in the rabi. This tends to prevent
water-logging of the soil. In the rabi the people lift water from
wells. There may also be kharif distributaries in dry tracts if there
is no water to spare in the rabi.
In calculating the sizes of the canals, N in Kutter’s co-efficient was
taken at ·020. In sharp curves the bed is paved on the side next the
concave bank. In high embankments where the soil is sandy the best
material is used as a core wall. The torrent works on the Upper Jhelum
Canal have been mentioned in _River and Canal Engineering_, Chapter XII.
Regarding the effect of the new canals on the inundation canals which
take off, lower down, from the Chenab below its confluence with the
Jhelum, it has for long been the policy to gradually shift the heads of
these canals upstream in order to obtain better supplies, or rather to
counteract the effect of the abstraction of water for the recently
constructed Lower Chenab and Lower Jhelum Canals. Any such abstraction
of water has not much effect on the floods, but it has much effect in
April and May, when the rivers have not fully risen, and in September,
when they are falling.
Public-domain text, read in full here on John Shaqi.
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