As with our lakes and streams, Wisconsin’s wetlands are highly varied. Wetlands are (CWGC,WGNHS,USGS data) Figure 10. Problems with nitrate contamination can be dated to a 10-fold increase in agricultural fertilizer sales between 1960 and 1978. Since 1978, fertilizer sales have remained constant. Waters of Wisconsin Report Open-File Report 83-933: Drainage-area data for Wisconsin streams, E.W. Henrich and D.N. Daniel. 1982. Open-File Report 82-911: Effects of urbanization on the magnitude and frequency of floods on small streams in Tennessee - basic data report no. 2, Clarence H. Robbins Daily loads of suspended sediment and total phosphorus for the 10-year, 1-day design high flow and average of the 16-year period (1975 to 1990) were computed for 18 well-monitored tributaries to Lake Michigan and Lake Superior use of constituent-transport models. More years of data are available from the USGS for most of the gaged Drainage-Area for Wisconsin Streams US Geologic Survey Open File Report 83-933 3. Bridge Waterways Analysis Model: Research Report Report No. FHWA/RD-86/108. 4. Bridge Manual Wisconsin Department of Transportation.
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