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Tuesday, October 31, 1989 / University Daily Kansan
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THE BEST OF
FROM LINCOLN CENTER
By Travis Butler
Kensan staff writer
KU researchers are working on a new survey method that could change the way some water pollution studies are done.
Researchers look for ways to speed testing of pollutants in streams and watersheds
Survey may find water pollution by air
The State of Kansas Biological Survey hopes to use aerial photographs to determine water quality in a given area. The new method, if it works, will greatly speed studies of non point-source pollution.
Non point-source pollution is an insidious kind of water pollution, said Paul Liechti, assistant director of the Biological Survey. It occurs when small amounts of a pollutant, applied over a broad area, concentrate in dangerous amounts in the water supply.
An example is a heavy rainfall from a farmer's field that washes herbicides from the field into nearby streams. While the herbicides were applied at a harmless level on the field, they could reach a dangerous concentration when runoff from the entire field is focused in one or two streams.
Jerry Whistler, a researcher with the Kansas Applied Remote Sensing Program, said that this kind of pollution was the main cause of ground water pollution in the United States. A 1978
Right now, water pollution studies require that teams of scientists go out and take samples of water in an area to determine the level of pollution, evaluate its effects, and eliminate this requirement in most cases.
national water inventory by the Environmental Protection Agency determined that non point-source pollution was affecting two-thirds of the nation's watersheds.
As a sidelight to this research, the Remote Seaming program is trying to determine if land use can be determined from computer analysis of aerial photographs of human analysis of aerial photographs, he said.
Researchers know that there is a correlation, Whistler said. Because land use can be determined from an aerial photographic survey, scientists will be able to make rough determinations of the water quality of an area without making an actual physical survey.
To test this, they will compare the results from a traditional survey of an area in northeast Kansas with aerial photographs taken for a 1986 reapraisal survey showing land use.
Liechti said that this would save a lot of effort. "It's very time-consuming and very expensive to collect that kind of data," he said. "We'd like to identify potential problem areas right away, and then send out a team of researchers to check them out. We can't send out teams to check the entire state that way. The whole objective of this project is to get a good picture of the whole state."
how close the connection was between land use and the environmental quality of water.
Whistler said that although researchers in the Remote Sensing program and at the Biological Survey thought this would work, they weren't sure
An IBM PC-AT compatible desktop computer can analyze a photo from the Landsat survey satellite, covering 115 square miles, in 25 to 30 days. Whistler said it would take a person 489 hours to cover an equivalent area with aerial photos, which cover an area only 9 miles by 9 miles a photo.
Liechiit the project was delayed by problems with the field work portion of the test.
"It was a drought year, and we had some setbacks," he said. "We expected to complete the field work in two weeks, and it took us two months."
Whistler said he expected the final report on the project to be finished by January.
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