Optimum
utilisation of irrigation
By Dr Navin Chandra
Joshi
Indias
progress in agricultural pro-duction has
largely been helped by the availability
of irrigation water resources. It is,
therefore, appropriate that the
Government has laid emphasis, on
completing the ongoing works in medium
and major sectors and on improving the
quality of irrigation in the command of
existing projects.
Even so,
water as a resource is going to be under
tremendous pressure from population
growth, rapid urbanisation,
industrialisation and environmental
degradation. A long-term perspective
planning of water resources is thus the
need of the hour to meet the various
competing demands an water.
The main
objective of the national perspective
plan for water resources, as the National
Water Grid in its new form is called,
should be to gainfully utilise the
surplus water available in some rivers by
transferring it to river systems in the
water-scarce tracts.
As is
well-known, our total water resources of
1150 cu km per year are not uniformly
distributed throughout the country. For
example, 29 per cent of it is available
in the Brahmaputra basin which
constitutes only 6 per cent of the
countrys area and where only 3 per
cent of our population resides.
As against
this, the availability of water is much
less than the national average in certain
southern and western regions. In many
southern regions, for instance, the water
availability is as low as one-fourth of
the national average.
To gauge
the need for substantial increase in
irrigation potential, it is pointed out
that the present demand of 200 million
tonnes of foodgrains in India is likely
to go up to over 450 million tonnes by
2010. As such, an integrated approach is
required to harness the countrys
entire irrigation potential through
major, medium and minor irrigation
projects, including groundwater and
maintain its sustainability through
watershed development at the national
level.
Today, the
country has only 37 per cent agriculture
under irrigation. The rest is rainfed.
The Government has also launched schemes
for saturation with rain water harvesting
in certain districts in. the recent
years. But planning is still quite
haphazard and half-heartedly implemented.
It must
also be said that our agricultural
holdings are quite small and therefore
large irrigation projects become quite
expensive for them. Needless to mention
that it is the small irrigation schemes
which have been very effective in the
agricultural growth of countries like
China and others.
For this
purpose, a Million Wells Scheme was
started in 1988 so as to provide water to
small and marginal farmers. The scheme
did not work well in the initial years
but in 1990, 20 per cent of the Jawahar
Rozgar Yojana funds were specifically
allocated for it. This allocation was
raised to 30 per cent in 1993 to cover a
whole lot of minor irrigation schemes as
also the land development works.
Ultimately,
MWS was considered as an important
programme for eradication of poverty in
rural areas. The scheme is centrally
sponsored and expenditure is shared
between the centre and the states on
80:20 basis.
While
allocation under the MWS is primarily for
open wells only, the funds could be
utilised for other schemes of minor
irrigation like irrigation tanks, water
harvesting structures and for the
development of lands belonging to small
and marginal farmers. Each
well/irrigation scheme is to be located
in the holding of the beneficiaries and
it is recorded in the revenue records.
No wonder,
if full utilisation of the potential is
made, there would be no shortage of
irrigation facilities in the country. The
total area under irrigation is around 83
million hectares and it needs to be
increased to about 110 million hectares
by the end of 2001.
This is
not a difficult task if adequate and
appropriate measures are undertaken by
connecting the country with all types of
water routes and if water is harnessed
and utilised properly without waste.
An
important aspect in utilisation of the
potential is the proportion of medium and
major projects on the one hand, and minor
irrigation on the other. There is a huge
gap between irrigation potential created
and its actual utilisation in respect of
major and medium irrigation projects.
This gap
was 1.2 million hectares in the First
plan period and it went upto 6 million
hectares by the end of the Eighth plan
period. As for the minor irrrigation
projects, such gap was of the order of
3.3 million hectares.
Thus, the
aggregate gap in the utilisation of the
potential happens to be around 9.3
million hectares at present. This
situation is one of the important reasons
for shortfall in foodgrain production
during the earlier years.
Most of
the major and medium projects are
predominantly fed by rain which is mainly
restricted to three months of July,
August and September, though rain during
June to October also contributes to some
extent in augmenting the water supply.
Consequently, the cropping pattern of
almost all major and medium schemes
provides for a very substantial
proportion of irrigation during kharif or
rainy season. The water used in raising
these crops is replenished by rain.
Minor
irrigation schemes, it may be noted,
include ground water and surface water
schemes, while ground water schemes
include dug wells, shallow tube walls and
pumpsets, the surface water schemes
include banks and reservoirs, diversion
schemes, life irrigation from rivers and
streams, and so on. The minor schemes are
quick maturing and labour-intensive
having a good potential for labour
employment.
Unfortunately,
water management in our public canal
irrigation is not all that good. Farmers
located at the head-end of a canal
system, say a canal outlet, tend to
appropriate more of irrigation supplies,
to the disadvantage of their brother
farmers at the end of that outlet.
Besides
reduction in maximum total output from
canal irrigation, this unequal sharing of
water leads to waterlogging and soil
salinity problems, which are more visible
in head-end reaches of a canal system.
This brings us to the question of
environmental degradation from canal
irrigation development.
Waterlogging
and soil salinity are undoubtedly bad
both for the present as well as the
future generation of farmers. These
negative environmental consequences also
raise problems of inter- generation
equity. That is why environmentalists
insist that agricultural development
should take place on a durable or
sustainable basis, without there occuring
a fall in agricultural production in the
future.
Worse,
however, is the fact that due to lack of
utilisation during the rainy season,
floods occur in the lower reaches, while
water is wasted by going to the sea. In
fact, creation of irrigation potential
has been treated as an end in itself and
no sufficient attention has been paid to
its end-use.
As such,
any programme for improving water
management over a large portion of an
entire irrigation system should involve a
rapid assessment of the present
situation, a review of the alternative
methods of improvement, and monitoring of
the improved programme so that when new
or additional constraints are observed,
they can be dealt with according to the
existing resources.
Extension
services can play their role effectively
only if the irrigation systems are
properly laid out. This suggests that in
addition to the main canal system, water
channels and field channels should be
fully laid out and executed for carrying
water to the farmers fields. It
should be incumbent on the state
department of irrigation to consult
agriculture department and evolve a
proper water distribution system for
optimal use.
Water
should be so regulated that it becomes
available at predetermined and
well-publicised periods as also during
critical stages of water requirements for
different crops according to an agreed
cropping pattern.
But then,
at the same time, emphasis should shift
from major to medium and to minor
irrigation projects with simultaneous
efforts to develop the huge ground water
potential that may be compatible with the
national water policy. Along with that,
there has to be an equally important
emphasis on creating software components
such as extension, credit, marketing,
research, etc., with aview to make full
use of the heavy investment made in
irrigation methods of various types.
In India,
irrigation potential has come to be
created by both the Government and the
farmers. By and large, major and medium
irrigation dams have been constructed and
managed by the Government whereas
irrigation wells other than the
state-owned tube wells have been
constructed and managed by the farmers.
The data
relating to the irrigation potential
created is open to dispute mainly because
the irrigation Department provides
information based on the exaggerated
potential created by projects just to get
the approval of the Government and
ofcourse, the World Bank. But the Revenue
Department goes by the assessment of
actually irrigated land for purpose of
collecting the land revenue.
Besides,
in the case of minor irrigation works
like tanks and wells, the originally
estimated irrigation potential gradually
shrinks on account of silting and owing
to decling in the ground water level. The
data on irrigation potential is not
annually or even periodically adjusted to
these changes. Consequently, a wrong
impression is created for the correct
potential with the help of exaggerated or
even fudged data doled out by the
irrigation department.
Recently,
the Parliamentary Standing Committee on
Agriculture expressed dissatisfaction
with the plea of the Water Resources
Ministry that a lag of a few years
between creation of irrigation potential
and its utilisation is unavoidable as it
takes time for the farmers to prepare the
land for irrigated farming. It noted with
concern the neglect of the existing
irrigation projects while new projects
were being taken up by the State
Governments.
Since plan
funds are not adequately allocated for
irrigation projects, their
maintenance and modernisation programmes
are generally neglected. The situation
has been aggravated by the low recovery
rates while water rates have not been
raised sufficiently for a long time.
According
to the Water Resources Ministry, the
countrys potential to irrigate our
agricultural land is around 114 million
hectares at present. Out of this,
potential to irrigate 59 m. ha can be
tapped by major and medium projects and
55 m. ha by minor schemes. As much as 40
m. ha of minor irrigation potential is
from groundwater and 15 m. ha from
surface water. In addition, inter-basin
transfers can enable irrigation in about
35 million hectares of land.
The
slackening in the pace of new large-scale
surface irrigation projects has brought
into focus the role of ground water
exploitation for irrigating the thirsty
croplands of India. Although wells have
been a traditional source of irrigation,
there is no gain saying the fact that
there is need for scientific exploration
of groundwater resources and their
rational exploitation. Above all, the
present status of irrigation through
canals and wells needs to be improved
considerably. Only then we can increase
productivity of land for enhancing our
agricultural output which is very low at
present.
PTI
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