More contaminants entering waterways

WATER TREATMENT: Sweeteners Persist in Waterways

A 438 volume 117 | number 10 | October 2009 • Environmental Health Perspectives Vehicles Concentrate Nicotine A study by Patrick Breysse et al. published online 25 August 2009 ahead of print in Tobacco Control found that vehicle passengers riding with smokers may be exposed to nicotine levels 40–50% higher than those found in restaurants and bars that permit smoking. Nicotine concentrations ins...

Nutrient Pollution: A Persistent Threat to Waterways

Are the More Academically Able Agriculture Teacher Candidates Not Entering or Remaining in the Teaching Profession?

The quality of education provided by public schools in America has been under considerable scrutiny in recent years. In his report to the public entitled, A Nation at &&, Gardner (1983) suggested that today’s beginning teachers are not as well qualified as those who previously entered teaching. Studies by Schlecty and Vance (1981) and Weaver (1984) suggested that the academic ability and/or qua...

NaSS: system simulation of inland waterways

Proceedings of the International Conference on Harbor, Maritime and Multimodal Logistics Modeling & Simulation, HMS 2009 ISBN 978-84-692-5416-5 146 ABSTRACT The Navigation System Simulation (NaSS) suite of tools has been developed by the Institute for Water Resources of the U.S. Army Corps of Engineers (Corps), as part of the Navigation Technologies Research Program. NaSS is composed of two pri...

Predicting oxygen content downstream of weirs, spillways and waterways

P. Novak, Consultant In his paper the author has made a very useful contribution to the subject of prediction of oxygen content downstream of spillways, particularly in the case of surface aeration. However, some of the analysis referring to previously published results of oxygen uptake at hydraulic structures is not always rigorous enough. 40. The equations quoted for Avery and Novak apply to ...