Hussain Sagar, the picturesque lake in the heart of Hyderabad
was built during 1562 by Hazarath Hussain Sha Wali of the Qutub Shahi dynasty with
a basin area of 240 Sq.Km to fulfil the drinking water requirements of the people.
The water in the lake was reasonably good till 1976.
Over the years, Hussain Sagar Lake has become polluted through
entry of untreated sewage and industrial effluents through the nalas that flow into
the lake. As a result, nutrient rich sediments accumulated in the lake bed which
in turn acted as an internal source for supply of nutrients to the Lake water. Other
sources of pollution included cattle washing, vehicle washing, dumping of domestic
solid waste along the shore line as well as the immersion of large numbers of Ganesh
and Durga Idols during festivals containing paints, clay, gypsum and plaster of
Paris, flowers and garlands.
Issues affecting the Hussain Sagar Lake:
There are four major Nalas through which domestic sewage, industrial
effluents and other debris enter the lake.
- Balkapur Nala
- Banjara Nala
- Kukatpally Nala &
- Picket Nala
- Domestic sewage entering the lake contains levels of Nitrates and Phosphates
beyond permissible limits, which promote the growth of algae/water hyacinth in the
- As the algae/water hyacinth decompose, it uses lot of available oxygen in
the water thereby making it deficient for other aquatic fauna like fish etc. causing
the death of these organisms.
- The lack of oxygen ultimately affects the decomposition of algae also and
which simply falls to the bottom of the lake adding to the high levels of organic
matter in the lake bed.
- Non-decomposition of organic matter, non availability of oxygen, result in
emanation of various gases from the lake bed causing lot of foul smell from the
- Direct dumping of litter, garbage, plastic waste, and other debris in the
lake besides creating pollution are an eyesore too.