2.4 The
Scenario 2025
Pertaining to Pakistan,
the SARWV has brought out the Scenario as under:
2.4.1 Water for Food
Projections of food
production indicate that Pakistan will have shortfall in the production of all
major food grains and crops. Projections of grain production show a shortfall of
11 million tons by 2010 and 16 million tons by 2020. It is estimated that by
2025, Pakistan will be short by 28 million tons of different food crops The
government would be forced to import edible oils large quantities of wheat as
well as all major crops. With growing external debt poor foreign and internal
financial resources and an inadequate industrial base it would be very
difficult, if not impossible, for the government to finance the rising import
bill. Food scarcity could create famine-like conditions in the country
This is not much of
a vision of a sustainable scenario; rather, ringing of the alarm bells to see
the challenges and devise ways of coping with them in good time
2.4.2 Water for Pee. pie
Even conservative
estimates indicate that the population of Pakistan will have grown to 208
million by 2025 About 50 percent of the population will be living In the urban
areas thus exerting additional pressure on the already strained municipal
facilities To provide adequate water supply and sanitation coverage to this
population would require large investments in the sector of the order of Pak Rs
12 billion (245 million US$) per year. In the absence of adequate domestic
water supply, sanitation and drainage by the public sector, people will begin to
dig their own wells and the indiscriminate groundwater exploitation, that IS in evidence today, will increase many-fold leading to
further pollution of the natural aquifers. The lack of sanitation and drainage
facilities with no provision for sewage treatment will lead to further
pollution of freshwater supplies Pollution in rivers and streams will increase
and aquatic life in the rivers and streams will be severely threatened. In the absence
of water quality monitoring and testing, the incidence of water-borne diseases
will continue to grow and some of the diseases which have been eradicated from
Pakistan will resurface such as the guinea worm disease, etc. Mortality and
morbidity rates of the vulnerable sections of the population will increase. These
challenges need to be addressed with a great sense of urgency.
2.4.3 Water for Nature
The 2025 scenario
with respect to the fragile ecosystems of the upland areas of Pakistan is not
an enviable one. Pakistan today has less than 4 percent of its area under
forest cover. Without proper development of the watersheds, the forest
resources of the country, found mostly in the north, will be depleted. At a
rate of 4 percent of depletion on an annual basis, there may hardly be any
forests in the country by 2025. This will lead to further erosion of silt and
the sedimentation levels in the rivers will increase further eroding the
storage capacity of the reservoirs thereby posing additional problems in the
ultimate disposal of the silt The reduction in the forest resources could
reduce the carbon sinks in the upland areas and add to higher temperatures. The
increased temperatures could speed up the snow melt in the summer and add
greater flows being discharged during short periods in the Indus river system.
This would increase seasonal variability and add to the wastage of water to sea
as additional storages are unlikely to be put in place. Large quantities of
flood water are wasted to the sea as evident from post Tarbela (1977-94) flows
of Indus below Kotri. It is estimated that around 39.4 BCM (32 MAF) is
currently wasted to the sea.
The major
environmental problems are water-logging and salinity problems; sedimentation
of reservoirs with the storage capacities getting eroded; and the salt balance
of the soils with nearly 25 million tons being retained in the soils every
year.
Important aquatic
resources, mangrove forests and coastal areas need to be protected from
intrusion of sea water which is gradually increasing. Mangrove forests cover
321,510 acres (130,166 Ha) of the tidal coastal area from Karachi to Rann of
Kutch They are an important source of firewood and provide the natural breeding
ground for shrimps. Similarly, fresh water fish are an important source of
protein for the people along the Indus. However, these resources are under
threat due to the pollution in the rivers and streams.
2.4.4 Water Resources
Development
The flow of the
Indus River and its tributaries constitutes the main source of surface water
for the country. There are large annual fluctuations and seasonal fluctuations
in the river flows. The Kharif inflows average about 141.8 BCM (115 MAF) and
the Rabi inflows average 27 BCM (22 MAF). Thus 83.6 percent of the flows are in
six months of high summer (Kharif) and only 16.4 percent is in the winter
(Rabi) season. To stagger the peak summer flows three surface reservoirs were
constructed at Mangla (1967), Chashma (1971) and Tarbela (1974). The initial
storage capacity of these reservoirs was about 19.3 BCM (157 MAF) however, there
are about 500 mil/ion tons of sediment which flows through the Indus river
system on an annual basis which has eroded the storage capacity of the
reservoirs.
The groundwater
storage capacity in Pakistan is estimated around 67.8 BCM (55 MAF). The hydro-geological
conditions are mostly favorable for pumping by tube-wells. It is estimated that
15,504 large capacity public tube-wells and 469,546 private tube-wells
of low capacity are currently installed in the country The groundwater pumpage
in the Indus basin has increased from 4.12 BCM (3.34 MAF) in 1959 to 59.2 BCM
(48 MAF) in 1996-97.
Indiscriminate pumping without proper monitoring and lack of knowledge about the chemistry and hydrodynamics of
the aquifer has already contributed to the Pollution of aquifers. In
many places, the salinity of tube-wells has increased. Pakistan's groundwater
resources are at the brink of exhaustion and there is a need to conserve this
invaluable resource. In this context, several water conservation programmes are
being implemented in different parts of the country.
In Baluchistan,
which relies almost exclusively on groundwater, the water table has been going
down by 2-3 feet (0.60-0.91 meters) on an annual basis.
At the time of
independence, about 789 BCM (64 MAF) of water was being utilized annually in
the irrigation canals in the country. With the construction of more barrages, link canals, and
storage dams, water use has increased to an average of 130 BCM (106 MAF). Per
capita water availability has gone down from 5104 cubic meters in 1950 to
around 1200 cubic meters currently. Out of the 43 - 49 BCM (35 - 40 MAF) going
to the sea, a total of about 30.8 _ 37.00 BCM (25 - 30 MAF) can be used for
future development through construction of mufti-purpose storages, remodeling
of canals and irrigation extension schemes. There is little potential for
increase in water availability for Pakistan from surface or ground water
sources. However, the Ninth Five Year Plan (1998 - 2002) envisages that
about 5.32 BCM (4.32 MAF) can be made available through conservation measures
and installation of tube-wells.
The competitive demands
from different sectors have not yet emerged as a key issue in Pakistan
but are likely to become a major issue in future. Pakistan needs to review
strategies for reallocation of water from irrigation to domestic use.
Conservation measures in agriculture can help in increasing the productivity of
water