Dr. Martin T. Auer Professor of Civil & Environmental Engineering Michigan Technological University Houghton, Michigan Prepared for IAGLR 2001 Green Bay, Wisconsin

Distance from Fox River Mouth (km) TP (µgP/L)Quota (P, %POC) Chl (µg/L) Bottom Aphotic Photic

Distance (km) Summer Minimum D.O. Sat. (%) > 3 SOD (gO 2 m -2 d -1 )

360360

Point Sources 35% Non Point Sources 65%

Non Point Source Model Water Quality Model Trophic State Land Use Soil Texture TP UALs TP Load

 Soil Texture Land Use Area Soil Texture Land Use UAL Lower Fox, River Lakes, and Lake Winnebago Watersheds

Empirical Relations for Trophic State = ƒ (Total P) V dP dt WQPEPPVkP adj  '()

LaSalleThe Griffon

Ray Canale Anita Barth Eye Larry Londo Tom Heidtke Bob Gardiner Dennis Rosnowski Mark Kieser Bob Schuurmans Auer, M.T. and R.P. Canale Mathematical modeling of primary production in Green Bay (Lake Michigan, USA): A phosphorus and light ‑ limited system. Hydrobiological Bulletin, 20( 2 ): 195 ‑ 211. Auer, M.T., Kieser, M.S., and R.P. Canale Identification of critical nutrient levels through field verification of models for phosphorus and phytoplankton growth. Canadian Journal of Fisheries and Aquatic Sciences, 43(2): 379 ‑ 388. Canale, R.P. and M.T. Auer Personal computers and environmental engineering. Environmental Science and Technology, 21(10): 936 ‑ 942. Heidtke, T.M., Auer, M.T. and R.P. Canale Microcomputer models and water quality: Access for decision ‑ makers. Journal of the Water Pollution Control Federation, 58(10): 960 ‑ 966. Funded by U.S. EPA MED, Duluth, Minnesota