Although 20 years of regulation brought an overall reduction in pollutant loads to the Lake Michigan basin, data indicate that pollutants still negatively affect the chemical, physical, and biological components of the Lake Michigan ecosystem. The rivers and tributaries flowing into Lake Michigan convey the contaminants from their source areas to the lake, and this report attempts to describe the monitoring efforts that have sought to characterize the quality of surface water in the Coastal Nonpoint Pollution Control Plan Area (CNPCPA). For this project, all water-quality data available from several sources were assembled into a database, and analyzed for trends using multiple regression analysis. Of the 1,079 water-quality attributes that were analyzed for trend, 536 (50%) exhibited a statistically significant time trend. Of those, 278 (52%) were positive trends (declining water quality) and 258 (48%) were negative trends (improving water quality). Additional supporting data files (Access database tables) are available for this open-file study. To request a downloadable data archive, or alternatively a CD-ROM, please contact: Indiana Geological Survey Publication Sales Office 611 N. Walnut Grove Bloomington, IN 47405-2208 Hours: 8am-12pm and 1pm-5pm, Monday-Friday 812-855-7636 email@example.com
You may also like:
Can't find what you're looking for? Feel free to contact us directly:
Publication Sales Office
Indiana Geological and Water Survey
611 North Walnut Grove
Bloomington, IN 47405-2208
IGS Return Policy
All sales are final. Materials may not be returned after they have been accepted by the customer. Any discrepencies in mail orders must be reported to IGWS within 10 days of receipt of order.
The Indiana Geological and Water Survey will refund the purchase price and sales tax of products if returned with the original sales receipt within 10 days of receipt of order. Refunds will be issued with the same method of payment as indicated on the original receipt except for cash purchases, which will be refunded by check. Items must be returned in the same condition as purchased. Refunds on digital products and services are not allowed, except for defective media such as CD-ROMs, flash drives, and so on. The customer is responsible for paying shipping costs to return items.