August 27, 2009 Leave a comment
The water level in the Mettur dam stood at 97.80 feet on Wednesday against its full level of 120 feet. The inflow was 8,343 cusecs and the discharge, 15,000 cusecs.
Keep your environment green…
August 27, 2009 Leave a comment
MADURAI: Water level in the Periyar dam on Wednesday stood at 118.20 feet (136 feet) with an inflow of 584 cusecs and a discharge of 800 cusecs.
The level in the Vaigai dam was 50.69 feet (71 feet) with an inflow of 291 cusecs and a discharge of 60 cusecs.
The combined Periyar credit stood at 3,154 mcft. Periyar dam recorded a rainfall of 5 mm followed by Tekkadi 0.7 mm.
Pesticides and fertilizers from homes are a major and overlooked source of water pollution, according to new research from the University of California, Davis. Previous estimates may have underestimated water pollution from homes by up to 50%, the study says.
Researchers monitored homes in eight different neighborhoods in California, and say that the estimates likely extend to households across the country.
Pesticides, particularly for ant control, were the most common source of pollution. Surprisingly, pesticides made from organophosphate chemicals, which have been off the market in California since 2002, turned up in many of the samples.
“We expected to find pesticides, but I think we were surprised at how consistently we found them,” says Lorence Oki, a landscape expert who lead the research.
Previous models underestimated home water pollution because they relied on data only from the rainy season, which measured pollution washed into municipal storm drains after rainfall. But these newer models tracked pollutants during both the rainy and dry seasons, and found that activities such as garden watering or car washing washes a significant amount of pollutants into storm drains, and that the concentration of pesticides is higher during the dry season.
Oki says that outreach programs focused on pest management and irrigation control could help reduce the number of pesticides and fertilizers and decrease the amount of water used on gardens.
By Monica Heger
Photo: Sources of polluted runoff. (National Oceanic and Atmospheric Administration)
WASHINGTON – A new study has determined that homes are an alarming and probably underestimated source of water pollution, and can contribute to 50 percent more water pollution than previously believed.
Scientists Lorence Oki, Darren Haver and colleagues carried out the study.
In the study, the research team explains that runoff results from rainfall and watering of lawns and gardens, which winds up in municipal storm drains.
The runoff washes fertilizers, pesticides and other contaminants into storm drains, and they eventually appear in rivers, lakes and other bodies of water.
“Results from our sampling and monitoring study revealed high detection frequencies of pollutants such as pesticides and pathogen indicators at all sites,” Oki said of their study of eight residential areas in Sacramento and Orange Counties in California.
Preliminary results of the study suggest that current models may underestimate the amount of pollution contributed by homes by up to 50 percent.
That’s because past estimates focused on rain-based runoff during the wet season.
“Use of pesticides, however, increases noticeably during the dry season due to gardening, and our data contains greater resolution than previous studies,” Oki said.
Pollutants detected in outdoor runoff included ant-control pesticide products.
Previous surveys have shown that the majority of pesticides purchased by homeowners are used to control ants.
To encourage pollutant reduction, the researchers initiated community outreach programs centered on improving both irrigation control and pest management. (ANI)
Scientists have said for years that it takes thousands of years for plastic to decompose – so how did a 16-year-old figure out how to make it work in just three months using local and household materials? The short answer is: a science fair, bacteria, a desire to see plastic bags put back into planetary cycles more quickly and, perhaps, a broader-than-usual sense of what is possible in the world.
In a small high school in a small town, teenager Daniel Burd made a simple mixture of water and landfill dirt and added a plastic bag, only to discover that a rapid rate of decomposition resulted. After experimenting with temperatures and other variables he isolated the microbacteria that made this miraculous process possible.
The inputs are inexpensive and the outputs have low environmental impact. In short: this is a potentially scalable solution to one of the biggest environmental problems on the planet – plastic bags we produce at a rate of 500 billion per year that clog our oceans, pollute our land, kill animals and take up landfill space the world over.
A new report estimates that desertification will expand up to 34% during the next century, enveloping an area the size of the United States.
This new report from researchers at the University of Maryland, College Park, makes a harsher prediction than previous studies that estimate expansions at about 10%.
“Our best guess is that human-induced global warming is going to dry out much of the arid lands in Africa’s Sahel region, areas around the Mediterranean Sea, the fringes of China’s Gobi desert, parts of South America and southwestern North America.
Moderate estimates by the Intergovernmental Panel on Climate Change (IPCC) predict that deserts will expand 10 percent worldwide by the year 2100. But it could be much worse.”