United States Geological Survey

713 items:

Summary of synoptic sampling and tracer-injection tests in the Alamosa River Basin during low-flow conditions, October 1998: A sampling analysis report for modeling reactive transport of metals for the Summitville Mine, Colorado Categories: Publication; Types: Citation
Linking selenium sources to ecosystems: San Francisco Bay-Delta Model Categories: Publication; Types: Citation
Water-quality data from two agricultural drainage basins in northwestern Indiana and northeastern Illinois: III. biweekly data, 2000-2002 Categories: Publication; Types: Citation
Calculation of weighted averages approach for the estimation of ping tolerance values A biotic index was created and proposed as a tool to assess water quality in the Upper Mae Ping sub-watersheds. The Ping biotic index was calculated by utilizing Ping tolerance values. This paper presents the calculation of Ping tolerance values of the collected macroinvertebrates. Ping tolerance values were estimated by a weighted averages approach based on the abundance of macroinvertebrates and six chemical constituents that include conductivity, dissolved oxygen, biochemical oxygen demand, ammonia nitrogen, nitrate nitrogen and orthophosphate. Ping tolerance values range from 0 to 10. Macroinvertebrates assigned a 0 are very sensitive to organic pollution while macroinvertebrates assigned 10 are highly tolerant... Categories: Publication; Types: Citation
Evaluating a Radar-Based, Non Contact Streamflow Measurement System in the San Joaquin River at Vernalis, California Accurate measurement of flow in the San Joaquin River at Vernalis, California, is vital to a wide range of Federal and State agencies, environmental interests, and water contractors. The U.S. Geological Survey uses a conventional stage-discharge rating technique to determine flows at Vernalis. Since the flood of January 1997, the channel has scoured and filled as much as 20 feet in some sections near the measurement site resulting in an unstable stage-discharge rating. In response to recent advances in measurement techniques and the need for more accurate measurement methods, the Geological Survey has undertaken a technology demonstration project to develop and deploy a radar-based streamflow measuring system on... Categories: Publication; Types: Citation

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