1. i1i1 i2i2 r p r = runoff from upslope areas i 1 = inflow from Upper Carbonate aquifer i 2 = inflow from Decorah area infiltration p = precipitation (direct) Diagram Illustrating Hydraulic Loading Sources to Soils Where the Decorah is the First Encountered Bedrock Soils overlying the Decorah (a 2 ) Upper Carbonate aquifer area (a 1 ) Target soil area (a 3 )

2. Q a = average annual hydraulic loading to target soil area Q a = r (a 1 + a 2 )+ i 1 (a 1 ) + i 2 (a 2 ) + p (a 3 ) r = 2 in/yr (1.2 gal/ft 2 /yr) i 1 = 7 in/yr (4.3 gal/ft 2 /yr) i 2 = 5 in/yr (3.1 gal/ft 2 /yr) p = 29 in/yr (18 gal/ft 2 /yr) Decorah area contribution = r (a 2 ) + i 2 (a 2 ) Target soil area contribution = p (a 3 ) Average Hydraulic Loading Rates by Source for the Decorah-Edge Landscape Setting in the Rochester Area Upper Carbonate aquifer area contribution = r (a 1 ) + i 1 (a 1 )

3. Generalized Shapes of Hydraulic Loading Areas in the Decorah Edge Landscape Setting Head SlopesNose SlopesSide Slopes Upper Carbonate aquifer area Decorah bedrock area Target soil area

4. i1i1 p r i2 r = runoff from upslope areas i 1 - inflow from Upper Carbonate Aquifer i 2 = inflow from Decorah area infiltration p = precipitation (direct) Cross Section Showing Hydraulic Loading Sources to Soils in the Decorah-Edge Hydrogeologic Setting

5. Calculated Hydraulic Loadings at the Decorah- Platteville Contact by Landscape Setting at PDS #1

7. 23 acres drain to Head Slope Area 1.8 acres drain to Side Slope Area Area of Upper Carbonate Plateau Draining to Recharge Zones at PDS #1

8. Modeled Average Annual Hydraulic and Nitrogen Loading Rates into Soils Overlying the Decorah at PDS #1

9. Modeled Water Storage Volumes and Average Residence Times by Landscape Setting at PDS#1 (with runoff)* * Assumes an average of one foot of saturated soil (30% water), a constant recharge/discharge rate, uniform mixing and distribution of water and no evapo- transpiration -- actual storage volumes may be larger and residence times longer.

10. Estimated Recharge Rates at the Decorah Edge (gals/yr/lin.ft) USGS Modeled Rate: 18,765 GIS Modeled Rate for South Zumbro Watershed: 9,600 GIS Modeled Rate by Landscape Setting at PDS#1: –Head slope: 1,289,618 –Side slope: 1,340 –Nose slope: 1,000 –Average of all slopes: 4,562

11. Assumes: 11 mg/L NO 3 -N in Upper Carbonate aquifer inflow, 9 lbs N/ac/yr from precipitation, & 10 lbs N/ac losses in runoff from upgradient areas. 9 lbs N/ac/yr 28 lbs N/ac/yr 84 lbs N/ac/yr Modeled Nitrogen Loading Rates by Landscape Setting at the PDS #1

12. Modeled Average Annual Hydraulic and Nitrogen Loading Rates into Soils Overlying the Decorah at PDS #1