Rainwater
harvesting- need of the hour
By Dr B K Fotedar
The union of India
is the seventh largest country in the world
covering an area of 3287263 square km and is
important country of South Asia. It has recently
crossed one billion mark in population. The
Tropic of Cancer passes through the middle part
of India. As a result, the southern half of the
country has a tropical climate. During winter,
the northern half of India is warmer than areas
of similar latitudinal location by 3degree to 8
degree celcius. This is due to the fact the Great
Himalaya checks the penetration of cold polar air
into India effectively. As against this in
countries like the USA and China where there are
no barriers of height of Himalayas, cold polar
air invades areas as low latitudes as 20 degree
north. Since north India is warm or mildly cool
during winter and hot for greater part of the
year, we generally say that India is essentially
a tropical country.
Inspite of the
diversities of climate prevailing in India, the
Scientists have been witnessing a climatic change
throughout the globe. Some times there are
unprecedented cyclones in India, other times
droughts and still we have been observing changes
in general weather conditions in many parts.
There are failure in monsoons, or even monsoons
many times get delayed considerably affecting
large parts of India to remain dry. Snowfalls
also occur unusually in odd months and that too
very less in amount. With this the volume of ice
caps become too less and further due to global
warming effect, scientists expect a sea rise, in
which many of the coastal areas would be under
water in the years to come. There would be
overall crisis of water and people will start
feeling pinch of the want. In the last a few
years, droughts have occurred in many parts of
India and this has brought out many miseries in
terms of myraids of diseases, malnutrition etc.
Then there is El Nino which has definitely an
effect on climates particularly on monsoons.
Strong El Nino means failure of monsoons.
Scientists believe that the greatest droughts
occurring in India are associated with El Nino.
El Nino has brought destruction in the pacific
coasts following devastating fires resulting in
the total destruction of crops. There was no rain
for months together making weather uncomfortable.
In all cases, the atmospheric conditions became
such that the rainfall decreases throughout the
globe and even drinking water became scarce. It
is now agreed upon that water scarcities will
become intense day by day.
It has been
reported by scientists that India will be
critically a dry region by the year 2025 as rural
-urban migration will increase to more than 50
percent of the total population by 2020. In
Delhi, water supply is expected to fall short by
932 million litres by the end of this year. The
city of Delhi is almost perpetually in the grip
of water crisis more so during the dry season
when serious shortages afflict the city.
Population in Delhi is expected to cross about 14
million towards the end of 2001 and hence there
would be more demand for water. Presently, the
requirement of Delhi people is 3324 million
litres per day, the installed capacity is only
2634 million litres per day. Massive plans to
build dams like Tehri, Renuka and Kishan are
under way in far away Himalayas drowning forests
and villages under their reservoirs. And while
more and more water is being sucked towards the
capital through elaborate channels, 50 percent of
the water leaks out from the pipes in the
distribution system in Delhi due to bad
maintenance. And finally with alarming pollution
levels in rivers like Yamuna, which supplies 70
percent of the drinking water for Delhi, it has
become imperative to find alternative sources of
clean water. On the flip side of the coin,
rainwater harvesting system has clearly passed
the test of the time. Rainwater harvesting in
several villages in drought hit areas of Gujrat
and Western M P has prepared their people to face
drought hit-situations. The state of Mizoram,
which receives around 2500 mm of rainfall every
year began to realise the value of rainwater
harvesting since the late eighties.
The main cause of
water scarcity today makes us to believe that we
have forgotten the old traditions of water
conservations systems. Starting at the rain drops
and wondering why did not follow in the footsteps
of their forefathers who traditionally stored
rainwater for future use in storage tanks of all
the conceivable shapes and sizes, rainwater has
successfully been harvested in Kundis in Churu
(Rajasthan), Surangams in Kerala, Zings in Ladakh
and bens in Jaisalmir. The miracle of rainwater
harvesting is illustrated by the contradictory
experiences in the arid desert of Rajasthan and
the wet hills of Meghalaya. Despite getting only
100 mm of rainfall a year, a severe draught in
1987 saw Jaisalmir city with enough water to
drink, mainly due to its water harvesting wells.
The Cherapunji district in Meghalaya famous for
the highest rainfall in India at 15000 mm, faces
acute water shortage and therefore, thy have
strictly applied rainwater harvesting techniques.
According to P R Pisharoty, one of India's
leading metereologists, India receives around 400
million hectare. The distribution of this
rainfall varies greatly between 200 mm in areas
of Thar desert and 11400 mm in Cherapunji in
northeast. Yet he points out that there is almost
no area where annual rainfall is less than 100
mm. Even this is adequate to meet local drinking
water requirements, it is harvested properly
where it falls.
Centre of Science
and Environment has started rainwater harvesting
in Tughlakabad over its building so that
sufficient quantity of rain get stores in the
underneath of the building. Even this practice
has been started in schools for example Shri Ram
School, Vasant Vihar N Delhi who has expressed a
deep concern on environmental issues through
student activities. The school is now involved in
spreading the message of water harvesting and
water conservation. Various other schools have
also started this technique by excavating
trenches and bends to regulate the flow of rain
fall runoff.
The actual scheme
of water harvesting involves the following steps:
The Water is
harvested by allowing it to percolate into the
ground for groundwater recharge.
The grooved
structure at the roof tops is essential for
channelising rainwater to be stored in an
underground tank for direct use.
For recharging
water, number of bore wells are needed to be
constructed around the building. Apart from these
an underground tank and check bund are used to
harvest water.
Brick check bunds
prevent water from flowing rapidly to promote
recharge through the recharge bore-wells and so
these are necessary.
Mouths of storm
water drains need to be raised above ground level
to prevent water from draining away.
The recharge
borewells need to be 9 meter deep. This has given
satisfactory results in many cases.
The structures
made within the building need to be inspected
frequently.
To prevent leaves
and debris from entering the system, mesh filters
should be provided at the mouth of the drain
pipe. Sand filter should be provided over the
tanks storing water.
Besides these the
trash generated in the domestic consumption
should never be thrown carelessly in the drain
pipes.
In Jammu area and
in all its adjoining areas, the need of the hour
is to start rainwater harvesting at the right
earnest. The water crisis is brewing fast as
observed since the year 1998. There are many
areas even in Jammu proper where water remains a
distant dream for days together and in the
absence of it the people are put to lot of
miseries. Municipal water supplies are inadequate
and cannot suffice a large part of the population
which is rising at a fast rate for the last two
decades. It is therefore, necessary that every
house should be constructed in such a manner so
that the roof tops contain provision for
collecting rain water efficiently. Unfortunately,
while so many other states have since started
conserving water by Rainwater harvesting
technique, Jammu still lags behind. Jammuites
have not understood that water is one of the
precious commodities that all have to value most.
It should be made mandatory for new constructions
to have roof tops grooved for collecting rain
water and storing the same in tanks. To face the
water scarcity in the years to come, the
concerted efforts should be made to conserve
rainwater. Our main mantra should be ''catch the
water where it falls''. The school children
should involve themselves in this exercise on the
same lines as has been done by many schools in
Delhi.
On
the mission trail again
By Satyendra Pratap Singh
Technology
missions are back in business in the Indian
science and technology sector. The difference
this time around seems to be the emphasis on
building the mission programme more on the
strengths than the sheer need. Spearheading the
mission projects is the Office of the Scientific
Adviser to the Government, Mr. A.P.J. Abdul
Kalam.
The India
Millennium Mission, 2020 (IMM) initiative is the
new avatar with a set of 30 integrated national
projects which are being structured to help build
and protect wealth and transform India from a
developing to a developed nation.
Technology
missions are not new to India. The experiments
driven by the technology-wizard. Mr. Sam Pitroda,
the Adviser to the late Prime Minister, Rajiv
Gandhi, during the mid-1980s, yielded good
results. The focus was on areas of need such as
drinking water, oilseeds, sugar, literacy, and so
on, with the express intention of improving the
overall quality of life of the people.
However, in the
post-economic liberalisation phase, with the
changed focus of bringing more public-industry
collaborations in the civilian sector and a
gradual squeeze on state-funding to civilian
research a slowdown in the mission programmes was
witnessed especially in terms of diversification
into more sectors.
A focussed, but
small technology development mission project was
formulated in 1993-94 with the activity centered
around the five Indian Institutes of Technology
(IITs) and the Indian Institute of Sciences
(IISc). A fund of Rs. 8 crore was made available
to them. In partnership with the Indian industry,
these institutes mostly concentrated on
technology upgradation programmes.
Some of the areas
where the contribution of these small-scale
mission mode projects are evident are in sugar
technology, fly ash utilisation, advanced
composites and in drugs and pharmaceuticals
sector. The beneficiaries of this exercise were
the small and medium enterprises, researchers,
IIT teachers and technologists.
The renewal of the
technology missions on a national scale in the
planned way began again in year 2000. Two key
factors that determined the formulation of the
India Millennium Mission, 2020, which is the
driver for this new initiative, were the massive
exercises carried out by the Technology
Information Forecasting and Assessment Council
(TIFAC) and the Defence Research and Development
Organisation (DRDO).
The TIFAC, along
with the Confederation of Indian Industry (CII),
brought out 18 volumes covering areas such as
agriculture, strategic materials, milk and
dairying, communications, sensors, aviation with
the help of the country's leading experts. The
objective was to draw up a road map of
development which would lead to the country
becoming self-reliant in the particular
technology area by 2020. The means to achieve was
through a collaboration between researchers and
the industry. The DRDO, on the other hand,
carried out a detailed exercise on integrated
strategies, technologies and missions for
comprehensive national security, drawing on the
expertise of people over hundreds of man-years.
The DRDO was already working on the defined goal
of achieving at least 60 per cent self-reliance
by 2005, as far as indigenous development of
components and key defence products were
concerned.
These two
independent initiatives in a way addressed the
generation of wealth and its protection in a
comprehensive manner and identified technology as
the linking factor. The India Millennium Missions
are the fusion of these two efforts, according to
Dr. Kalam, who has played a key role in both the
exercises.
The IMM 2020 will
be intensely technology-driven and structured as
a matrix of 30 inter-departmental national
economic and security missions. The Centre has
allocated Rs. 50 crore as initial funding from
five select projects that were launched during
2000, under the aegis of the TIFAC.
The real test for
the success of the projects will depend on the
synergy that can be achieved between the
Government agencies, especially the research and
academic institutions, and the Indian private
sector.
The TIFAC has
utilised the experience gained in funding
projects under its home-grown technologies scheme
to bring together private industry, research and
development organisation and engineering
colleges/universities in a special initiative
called REACH (relevance and excellence in
achieving new heights in educational
institutions).
Similarly, the
DRDO has, through its interface with industry,
societal mission projects launched with the
support of the Department of Science and
Technology (DST) and private industry, as well as
the collaboration with the CII in allowing eight
of its laboratories for private participation,
gained sufficient knowhow for forging better
synergies.
Based, on these
experiences, five mega projects have been
identified keeping in mind the core competence
that can be mustered. These are agriculture and
food processing, reliable electric power for all,
education and healthcare, information technology
and the strategic sectors. In essence, the 30
national IMM 2020 missions will revolve round
these areas. To give a fillip to these projects,
the Finance Minister, Mr. Yashwant Sinha
announced a 125 per cent weighted tax deduction
to all the investments made by the participating
industry and NGO groups in the IMM 2020. The tax
sop is now applicable to sponsored research in
national laboratories, universities functioning
under the aegis of the Indian Council of
Agricultural Research (ICAR), Indian Council of
Medical Research (ICMR), Council of Scientific
and Industrial Research (CSIR), DRDO, Departments
of Biotechnology (DBT), Electronics (DoE), Atomic
Energy (DAE), and Indian Institutes of Technology
(IITs).
Unlike in the
earlier technology mission projects, where the
Government was the main funding and driving
force, the present IMM 2020 are intended to be
more market-driven and a near-equal partnerships
between the Government and industry.
A refreshing
feature of the upcoming projects would be a
pooling up of the core competencies existing
among the private industry and the state-funded
research establishments. A typical feature is
evident in the successful projects in the Space
Department like satellite development, or the
missile development programme in the DRDO, or the
drug discovery projects of the DST and the CSIR.
With increasing competition, globally, and
tightening trade and patent regimes, the
partnership and judicious utilisation of funds is
becoming paramount for both the private sector as
well as the Government. In this context, the IMM
2020, by reorienting itself to the needs of the
market and creation and protection of wealth, can
play a catalytic role. INAV
|