Groundwater in Bayfield County. Madeline Gotkowitz Hydrogeologist April 23, 2015
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1 Groundwater in Bayfield County Madeline Gotowitz Hydrogeologist April 23, 2015
2 Groundwater in Bayfield County Groundwater basics Hydrogeology across Wisconsin Hydrogeology in Bayfield County Mapping groundwater features
3 Wisconsin s Water Cycle
4 Groundwater discharge to Honey Cree is baseflow
5 Hydrogeology: Groundwater flows through roc and sediment Water under the ground, within an aquifer; porous sand, gravel and roc holds water
6
7 Groundwater in dolomite and Distribution limestone of carbonate is vulnerable roc to contamination. Legend Silurian Su dolomite Sinnipee Os dolomite Prairie Opc du Chien dolomite
8 Bedroc within 50 feet of surface
9 Distribution of carbonate roc within 50 feet of surface
10 Calumet and Brown Counties
11 Wisconsin s groundwater contamination issues are significant The left jar contains brown water contaminated by manure. Both samples are from the same well.
12 Karst features can be easy to see Sinnipee Dolomite: Dane and Iowa Counties
13 Hydrogeology in Bayfield County
14 Courtesy of USGS Hydrogeologic cross-section
15 Glacial geologic formations sandy till Courtesy of USGS
16 Thicness of glacial deposits Courtesy of USGS
17 Glacial geology
18 Bedroc Geology Chequamegon Sandstone Freda Sandstone volcanics
19 Orienta Sandstone Amnicon Falls State Par Photo: E. Stewart, WGNHS
20 Wisconsin Groundwater Susceptibility Map Depth to bedroc, bedroc type, depth to water table, surficial geology, soil type
21 Wisconsin Groundwater Susceptibility Map Depth to bedroc, bedroc type, depth to water table, surficial geology, soil type
22 Example groundwater study Town of Byron Fond du Lac County
23 Depth to bedroc Town of Byron - Example
24 Water table elevation Town of Byron - Example
25 Groundwater recharge Town of Byron - Example Estimate accounts for: - Historical climate data - Soil moisture capacity - Soil type - land-use type
26 Groundwater contaminant susceptibility Combination of factors - Depth to bedroc - Bedroc type - Depth to water table - Recharge rate Town of Byron - Example
27 Hydrogeologic cross sections Town of Byron - Example
28 Nitrate, mg/l NO Iowa County Groundwater: susceptibility versus contamination Susceptibility Least susceptible Moderately susceptible Highly susceptible Most susceptible Nitrate, mg/l NO wells tested 14 % > 10 mg/l NO 3 46 % > 2 mg/l NO 3 Data from Central Wisconsin Groundwater Center and UW Extension.
29 Next steps: questions and discussion Groundwater susceptibility map requires: Collect, compile and analyze data: Depth to the water table Depth to bedroc Glacial deposits (sandy till versus clay till) Bedroc type (sandstone or basalt) Map of groundwater recharge rates Alternative: Develop hydrogeologic cross sections in ag-dominated areas to illustrate wells, groundwater and surface water in areas of interest Facilitate use of this information through educational and outreach efforts in Bayfield County
30
31 The Decorah-Platteville aquitard separates the shallow Galena aquifer from the deep aquifer. springs and streams Springs may develop along valley wall at times of high water table.
32 In upland areas, multi-aquifer wells can provide a pathway for groundwater to flow from the shallow to the deep aquifer. shallow well deep well multi-aquifer well water table potentiometric surface Aquitard Deep aquifer
33 Groundwater flows from high to low elevations. One use of the water table map is to identify where groundwater comes from that flows to a well or stream.
34 Groundwater recharge rates are high in Iowa County, due to permeable soil, and forest and agricultural land use. Infiltration, in an average year Infiltration, in an average year medium (6-9 inches/year) high (9-11 inches/year) medium (6-9 inches/year) high (9-11 inches/year) very high (> 11 inches/year) very high (> 11 inches/year) not defined (wetland or water) Miles Miles Does this mean that there is an unlimited supply of water? Ü 34
35 Lots of wells near one stream are lie too many straws in the glass Source: R. Smail, Wisconsin DNR
36 How do we use our groundwater? 2012 Wisconsin Withdrawls Agricultural irrigation surpassed municipal public water in 2012 due to the drought Groundwater pumping is about 760 million gallons per day Could cover the land area of Wisconsin with ¼ inch of water Source: R. Smail, Wisconsin DNR Enough water to fill Lambeau Field over 600 times Is that a lot of water? Is it too much?
37 Sinhole in SE Wisconsin
38 Perched groundwater in the Driftless Area, which has extensive aquitards. aquitard Perched aquifer Deep aquifer
39 How much recharge do we get? Hart et al., 2012 On average, about 8 to 10 inches per year in Dane County, WIsconsin Approximately 28,000 million gallons per day in Wisconsin We pump about 760 million gallons per day
40 Where does well water come from? 40
41 Pumping reduces discharge Citizens Natural Resources Association of Wisconsin & Trout Unlimited at the Mecan River from Alley, Reilly, and Frane, USGS Circular 1186, 1999
42 Precambrian roc Fractured Low well yield 42
43 Sandstone aquifer Sandstone and dolomite Extensive and thic Very porous- great storage Yields prolific water to wells 43
44 Dolomite aquifer: Shallow bedroc Lots of fractures Vulnerable to contamination 44
45 Dolomite and limestone are easily dissolved Caves, sinholes and fractures are common in this roc. Contaminants reach groundwater quicly
46 Pine Lae, Waushara County Photos courtesy of G. Kraft, UW Extension Tributary of Tenmile Cree Adams County, WI 2013
47
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