Dr Martin T Auer Professor of Civil Environmental

Dr. Martin T. Auer Professor of Civil & Environmental Engineering Michigan Technological University Houghton, Michigan 49931 Prepared for IAGLR 2001 Green Bay, Wisconsin

10 TP (µg. P/L) 150 120 6 90 60 4 30 2 0 Quota (P, %POC) 8 100 0 20 40 60 120 80 0 100 0 20 40 60 0 Chl (µg/L) 120 100 80 Photic 5 10 80 15 60 Aphotic 20 40 Bottom 25 20 0 120 100 0 20 40 60 80 120 30 100 0 20 40 60 80 Distance from Fox River Mouth (km) 120

100 Summer Minimum D. O. Sat. (%) 80 60 40 20 0 0 20 40 60 80 100 Distance (km) 120 0 -1 1 -2 2 -3 >3 SOD (g. O 2 • m-2 • d-1)

3 6 0

Point Sources 35% Non Point Sources 65%

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

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

d. P V × = W - Q × P + E'× ( P - Padj) - V × k × P dt Empirical Relations for Trophic State = ƒ (Total P)

La. Salle The Griffon

Ray Canale Tom Heidtke Anita Barth Eye Bob Gardiner Mark Kieser Larry Londo Dennis Rosnowski Bob Schuurmans Auer, M. T. and R. P. Canale. 1986. 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. 1986. 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. 1987. Personal computers and environmental engineering. Environmental Science and Technology, 21(10): 936‑ 942. Heidtke, T. M. , Auer, M. T. and R. P. Canale. 1986. 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