downtoearth-subscribe

Lakes

  • Environmental effects of river sand mining: a case from the river catchments of Vembanad lake, Southwest coast of India

    Rivers in the southwest coast of India are under immense pressure due to various kinds of human activities among which indiscriminate extraction of construction grade sand is the most disastrous one. The

  • Reclaiming the Aral Sea

    The Aral Sea in Central Asia was the fourth-largest lake on the planet in 1960. By 2007 it had shrunk to 10 percent of its original size. Widespread, wasteful irrigation of the deserts along the Amu and Syr rivers, which feed the Aral, cut the freshwater inflow to a trickle. Nevertheless, a dam built in 2005 has helped the northernmost lake expand quickly and drop substantially in salinity.

  • Plan to make lake adoption' a mass movement

    STRESSING ITS NEED: Tiruvallur Collector Rajendra Kumar speaking at a function to launch water bodies' adoption programme at SRM Eswari Engineering College recently.

  • Physico-chemical studies of Lake Jaisamand and Lake Pichhola - A comparative study

    Water bodies are subject to many important changes in due course of time. Therefore, a comparative study on Lake Jaisamand and Lake Pichhola were undertaken from July, 2004 to April, 2005. (2007)

  • Warning bells in Ansupa Lake, Orissa

    Ansupa Lake, one of the two freshwater lakes found in Orissa, is vanishing slowly. Another freshwater lake, i.e. named Saro, in Puri District, has already been wiped out from the wetland maps of Orissa due to anthropogenic pressure. (Correspondence)

  • PWD set to infuse life into lakes

    Survey in progress to demarcate boundaries of waterbodies; encroachments to be removed SPRUCING UP: An earth-mover on the job around the Perungudi Lake recently as part of the lake rehabilitation project of the Public Works Department. CHENNAI: The Public Works Department (PWD) has geared up its efforts to remove encroachments from, and rehabilitate lakes in the fringes of the city as per the Tank Protection Act, 2007. Of the 19 lakes, demarcation of the boundaries and serving of eviction notices to encroachers have been completed for five lakes, including Ayapakkam and Korattur in Tiruvallur district. A PWD official said measures were under way to complete the work by May as per a Madras High Court directive. Survey is in progress to demarcate boundaries of waterbodies in places such as Ambattur, Tambaram, Nemilicheri, Peerkankaranai and Kadapperi in Tiruvallur and Kancheepuram districts. Notices issued Eviction notices have been served so far on about owners of 1,000 households who have allegedly encroached on the lake. The work with regard to eight waterbodies, including those at Zamin Pallavaram and Kovilambakkam, however, has been put on hold because cases are pending in the court pertaining to removal of encroached structures, the official said. On completion of the area demarcation and removal of encroachments, measures to rehabilitate the waterbodies would begin. The districts' administration has to decide on issues pertaining to provision of alternative sites, the official added. Another senior PWD official said that around Rs.3.6 crore had been allocated to execute rehabilitation work, including construction of retaining wall, at lakes in Velachery, Pallavaram and Perungudi. One of the lakes on which the PWD recently started rehabilitation work at the cost of Rs.97 lakh is the Perungudi eri, which has a 35-acre spread. It is being used by residents of nearby Kallukuttai for various purposes, including bathing, washing clothes, animals and vehicles. Rehabilitation work The rehabilitation work includes clearing of the bushes around the lake, levelling and strengthening of the 816 meter bund and fencing the lake. A compound wall is to be constructed to a height of three feet over which there would be chain link fencing. Desilting work has already been completed in the lake. Perungudi panchayat president K.P. Kandan said toilets would be constructed nearby to prevent people from dirtying the place. The water from the wells that line the lake was being used to supply drinking water by the panchayat. Efforts hailed B.Maximus of the Kurinji Nagar Residents Association, who welcomed the efforts of the PWD, said they planned to plant trees and make a walkway around the lake with benches. "As it is being fenced and the area around getting cleaned, we are now planning to approach IT companies for funds to beautify the lake,' he added.

  • Geochemistry of Renuka Lake and wetland sediments, Lesser Himalaya (India): implications for source-area weathering, provenance

    The geochemical investigation of sediments deposited in the Renuka Lake basin and its adjoining wetland has shown variation in the distribution and concentration of major, trace and REEs.

  • Participatory fisheries management revisited

    Participatory fisheries management (PFM), as widely understood in Malawi, is a governance type that entrenches participation of the user community in fish resource management. In PFM, the Department of Fisheries (DoF) and the fishing community are key partners who, in an ideal situation, agree on shared roles and responsibilities, and formulate the goals, objectives and strategies of a particular management regime.

  • How a catastrophic flood cooled Earth

    A Vast Lake Trapped Under Ice Sheet Drained Into The Sea, Bringing Down Temperatures Paris: Canadian geologists say they can shed light on how a vast lake, trapped under the ice sheet that once smothered much of North America, drained into the sea, an event that cooled Earth's climate for hundreds of years. During the last ice age, the Laurentide Ice Sheet once covered most of Canada and parts of the northern United States with a frozen crust that in some places was three kilometres thick. As the temperature gradually rose some 10,000 years ago, the ice receded, gouging out the hollows that would be called the Great Lakes. Beneath the ice's thinning surface, an extraordinary mass of water built up

  • A poison pill

    One thing Canada is not short of is lakes. It has so many that it can afford to set some aside to experiment on. And that is what Karen Kidd, an ecotoxicologist at the University of New Brunswick, has just done to a small lake in north-west Ontario. She has poisoned it in the name of science.

  1. 1
  2. ...
  3. 158
  4. 159
  5. 160
  6. 161
  7. 162
  8. ...
  9. 176