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Over the years, Hussain Sagar Lake has become polluted through entry of untreated sewage and industrial effluent through the nallas 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.
Due to the resulting eutrophication, algal blooms and bad odour, the water body is not conducive for recreation & pisci-culture.
The Hussain Sagar Lake and Catchment Area Improvement Project (HCIP) is being conducted with aid from the Japan International Cooperation Agency, with an estimated cost of Rs. 310 crores.
  • To maintain the round the year water balance in the lake
  • To improve the lake water quality by preventing pollutants entering into the lake both point source & non-point sources of pollution
  • Removal of nutrient rich sediments at lake bed
  • Interception & Diversion of dry weather flows, improvement of Nallas
  • To improve the overall lake environment and its surroundings for enriched biodiversity
  • Increasing the potentiality of eco-tourism
2.1 Construction and Rehabilitation of Sewerage Facilities through:
  • Construction of a new 30 Mld Sewerage Treatment Plant at Picket Nalla
  • Upgradation of Existing 20 MLD Hussain Sagar Sewerage Treatment Plant
  • Construction of Ring Sewers around the Hussain Sagar Lake
  • Construction of Small Sewerage Treatment Plant 5 MLD at Ranghadhamini Cheruvu
  • Construction of Trunk Sewers
  • Capacity Enhancement of Interception and Diversion (I&D) Works
  • Recycled Water Supply Facilities
2.2 Lake and Nala Improvement works involving:
  • Dredging and Disposal of Sediments
  • Construction of Alternative Idol Immersion Places
  • Repair of Surplus Weir
  • Installation of Aeration Equipment
  • Shoreline Improvement
  • Nalla Improvement
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