Sedimentation

Order of the National Green Tribunal regarding waste disposal in Ghazipur drain, Delhi, 28/05/2025

Order of the National Green Tribunal in the matter of Residents Welfare Association Savita Vihar Vs Irrigation & Flood Control Department & Others dated 28/05/2025. The applicant raised the grievance against throwing of construction debris and sewage obstruction in the Ghazipur drain. According to the applicant this drain flows behind …

Self purification of a freshwater stream in Ile-Ife: Lessons for water management

Stream flow samples were collected with distances downstream over a river stretch of 6.5km. The rivers transcend different land use pattern and took it source from a large refuse dump in the central market (Ogbe market) Ile-Ife before flowing into a dam. Seven sampling points were carefully selected downstream the …

Risks yours, profits mine

A series of hydropower projects on the Bhagirathi and the Alaknanda may reduce the Ganga to a trickle. But project proponents will still be making money. Why project developers aren

Myth of power

Nourisher of an ancient civilization, the Ganga could be gasping for its survival. Every few kilometres the water of its tributaries will be diverted to produce power. While there may not be enough flow to run the turbines, there

Amazing formula

Power-generating companies can get a minimum fixed sum irrespective of how much electricity they produce Capacity Index (CI) = declared capacity

Himalayan blunder

Dam makers rake in the moolah irrespective of the amount of electricity projects generate TWO issues back this magazine had done a detailed analysis of the wind energy sector in the country. We told you how wind turbines were being installed in increasing numbers, but performed at a dismal level …

Perennial misery

The breaching of embankments in the upstream areas of the Kosi river, in Kusaha village in Nepal, has resulted in yet another round of floods in north Bihar, in the districts of Supaul, Saharsa, Araria, Madhepura, Katihar and Purnia. The disaster this time is much larger than usual. More than …

The Kosi disaster: Millions flooded out

Just as Hurricane Katrina caused levees in the Mississippi Delta to breach in August 2005, flooding large parts of New Orleans, this year

Major viral impact on the functioning of benthic deep-sea ecosystems

Viruses are the most abundant biological organisms of the world's oceans. Viral infections are a substantial source of mortality in a range of organisms

Death and life beneath the sea floor

Viruses that infect microbes in deep-sea sediments may be a key driver in the world's largest ecosystem and integral to the global carbon cycle, data reveal.

Palaeoecological and palaeoclimate potential of subsurface palynological data from the Late Quaternary sediments of South Kerala

The accrued palynological data obtained from the subsurface sediments of South Kerala Sedimentary Basin have been found to be useful for identifying various ecological complexes and their environmental preferences. The occurrence and relative abundance of Cullenia exarillata pollen along with other wet evergreen forest members at certain intervals are of …

Status of water treatment plants in India

The raw water quality available in India varies significantly, resulting in modifications to the conventional water treatment scheme consisting of aeration, chemical coagulation, flocculation, sedimentation, filtration and disinfection. The backwash water and sludge generation from water treatment plants are of environment concern in terms of disposal. Therefore, optimization of chemical …

Near-surface wetland sediments as a source of arsenic elease to ground water in Asia

Tens of millions of people in south and southeast Asia routinely consume ground water that has unsafe arsenic levels. Using hydrologic and (bio)geochemical measurements, the researchers show that on the minimally disturbed Mekong delta of Cambodia, arsenic is released from near-surface, river-derived sediments and transported, on a centennial timescale, through …

Poisoned waters traced to source

South Asia's well-water is widely polluted with arsenic, but no one has located the source. A study on the Mekong River finds that contamination begins in pond sediments, and is spread by groundwater flow to wells.

Irrawaddy may be poisoned by arsenic

Geological map pinpoints fresh areas of contamination in Asia.

Can Bangladesh trap silt?

Recently in Dhaka, Dutch ambassador Bea Ten Tusscher suggested that Bangladesh, decidedly to be worst-hit by global-warming-induced sea level rise, could outpace this disaster by trapping the silt three great rivers carry through it to the sea. It is a fascinating idea from the ambassador of a nation actively associated …

Studies on the impact of sewage discharge on the sediment characteristics of Poovar estuary, Kerala

The present investigation deals with the analysis of physico-chemical characteristics, concentration of heavy metals and textural analysis of sediments in Poovar estuary of Kerala during the period 2004-2005. Three sampling stations were selected and sediments were collected for the study.

Effect of idol immersion on water quality of twin lakes of Bhopal with special reference to heavy metals

Water quality of lake normall get contaminated every where by accumulaton of sediments, human waste, silt, organic matter, industrial waste but in India different type of religious activities (idol immersion) are taking place every year, to which other countries are not concerned. The water bodies selected for the study are …

Nitrogen cycling: A review of the processes, transformations and fluxes in coastal ecosystems

The coastal and marine nitrogen cycle occupies a complex, central role within the biogeochemical cycles. Human interventions in the earth system have risen to unprecedented levels, strongly influencing the global nitrogen cycle. The nitrogen cycle in the open ocean compared to coastal ecosystems appears to have remained unharmed, although recent …

Nitrogen transport by rivers of south Asia

The South Asian rivers show a discharge weighted average NO3-N of 2 mg/l and average sediment-bound N, that is mostly organic, of 0.2%. The reported global average for the uncontaminated river system is of the order of about 0.028 mg/l (NO3-N). Hence, our freshwater aquatic systems can no longer be …

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