Hydrogeology of Karst NE Wisconsin. Dr. Maureen A. Muldoon UW-Oshkosh Geology Department
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1 Hydrogeology of Karst NE Wisconsin Dr. Maureen A. Muldoon UW-Oshkosh Geology Department
2 WI Bedrock Outline Karst Landscapes Existing WQ Data Flow in Karst Aquifers Overview of Silurian Aquifer Water Level Variations Water Quality Variation Groundwater Velocities Recharge Process Storm Water Concerns
3 WI Geology
4 What is Karst? A type of topography that is formed on limestone (& dolostone) gypsum, and other rocks, primarily by dissolution, and is characterized by sinkholes, caves, and underground drainage (Glossary of Geology) Spectrum of landscapes -- Door Co. to tower karst of China Significant land area - 20% of U.S., 40% of area east of Mississippi River
5
6 Karst Potential in Wisconsin Carbonate is uppermost bedrock Unconsolidated Deposits < 50 ft thick
7 Carbonate is uppermost bedrock Surficial materials < 50 ft thick
8 Regional WQ Data
9 UWSP Well Water Quality Viewer
10 UWSP Well Water Quality Viewer
11 UWSP Well Water Quality Viewer
12 Well was drilled in June of ' ft deep, cased to 63ft Has been bleached seven times Tested over a dozen times in the past six years Persistent bacteria problems Nitrate level has fluctuated from high teens to 39 ppm.
13
14 Silurian Dolomite Aquifer
15 Silurian Dolomite Aquifer
16 Silurian Dolomite Aquifer Calumet and Brown Counties
17 Silurian Dolomite Aquifer Rapid downward flow in vertical fracture network Rapid lateral flow along bedding-plane parallel fractures Little to no attenuation of contaminants within the aquifer
18 Bedding-plane Fractures
19 Location Slide KEY 15-mile study area Wells used in correlation of high-permeability features Green Bay Big Quarry Dr-24 Dr-391 Jarmen (Dr-394) Dr-289 Dr-392 Dr-393 Kisser Quarry Dr-262 Dr-265 Dr-397 Dr-4 Dr-6 Bissen Dr-292 Quarry Dr-396 Lake Michigan
20 Water levels and fluctuations at a piezometer nest in fractured dolomite 800 MW3 MW3 Head (ft above msl) MW2D MW1 MW2A MW7C MW6A MW1 MW2D MW6A MW7C MW2A open intervals of wells 550 J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O Note the large variations in water levels (up to ~90 ft) (from Bradbury and Muldoon, 1992)
21 Water Quality Variation Well 20 Well 56 Well 61 MW-1 Head Precipitation J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A NO 3 -N values from three domestic wells completed in the Silurian dolomite (miles apart) Similar response indicates a non-point or diffuse source rather than point source of contamination (from Bradbury and Muldoon, 1992)
22 Groundwater Velocities Bissen quarry, Door Co, WI (Muldoon, 1999; Muldoon & Bradbury, 2005)
23 Elapsed Time (hours) Groundwater Velocities Bissen Tracer Tests Calculated velocities using peak arrival times Mix of fracture and matrix velocities Range m/day Mean 12.7 m/day Median 5.9 m/day Inadvertent Tracer Tests 100 s m/day peak conc 193, 7.0 hr velocity 74.7 ft/day peak conc 13.7, hrs 10-4 peak conc 216, 5.5 hrs velocity 115 ft/day 10-5 peak conc 3.41, 16.1 velocity 32.0 ft/day 10-6 peak conc 42.3, 55.2 hrs velocity 9.5 ft/day 0.00
24 Flow Characteristics of Karst Aquifers Dense and ubiquitous fracture network little surface runoff water easily infiltrates to subsurface Recharge exceedingly rapid carries surface contaminants to the water table Flow within the aquifer occurs primarily along bedding plane fractures Little to no attenuation of contaminants within the aquifer Flow rates vary from 10 s to 100 s of ft/day
25 Surficial Sediments Holy Hill Fm Yellowish brown to brown, sandy till (50 to 80% sand) with associated lake and stream sediment Kewaunee Fm Brown to reddish brown calcareous till with associated lake and stream sediment Sand content varies for different members, but generally till is sandy silt
26 Recharge in Areas of Thin Soils
27 miles locations of wells and rain gauge used in this study other municipal wells
28 Assessing Seasonal Variations in Recharge and Water Quality in the Silurian Aquifer in Areas with 10 to 20 ft of Soil Cover Maureen A. Muldoon, UW-Oshkosh Geology Dept. Kenneth R. Bradbury WI Geological & Natural History Survey
29 Site Selection Kewaunee Brown Calumet Manitowoc Depth to rock ~10 to 20 ft Depth to water <50 feet Downgradient of agricultural fields
30 Kewaunee Well Characteristics Completed geophysical logs to identify high-permeability bedding plane fractures Calumet Brown Manitowoc Well County Soil thickness Well Depth BN420 Brown CA1143 Calumet KW183 Kewaunee 7 33 MN544 Manitowoc
31 Precip (inches) 8/30/08 8/16/08 8/2/08 7/19/08 7/5/08 6/21/08 6/7/08 5/24/08 5/10/08 4/26/08 4/12/08 3/29/08 3/15/08 3/1/08 2/16/08 2/2/08 1/19/08 1/5/08 12/22/07 12/8/07 11/24/07 11/10/07 10/27/07 10/13/07 9/29/07 9/15/07 9/1/07 Cumulative (inches) CA-1143 Depth to Water (ft) MN-544 Depth to Water (ft) BN-420 Depth to Water (ft) KW-183 Depth to Water (ft) Water-Level Variations
32 Precip inches KW183 Conductivity KW183 Conductivity 12/31/07 12/24/07 12/17/07 12/10/07 12/3/07 11/26/07 11/19/07 11/12/07 11/5/07 10/29/07 10/22/07 10/15/07 10/8/07 10/1/07 Depth to Water (ft) Precip inches 3/25/08 3/18/08 3/11/08 3/4/08 2/26/08 2/19/08 2/12/08 2/5/08 1/29/08 1/22/08 1/15/08 1/8/08 1/1/08 Depth to Water (ft) Conductivity Variations October to December, January to March,
33 Precip inches KW183 Conductivity 6/24/08 6/17/08 6/10/08 6/3/08 5/27/08 5/20/08 5/13/08 5/6/08 4/29/08 4/22/08 4/15/08 4/8/08 4/1/08 Depth to Water (ft) Conductivity Variations April to June, Summary KW183 Sharp change in conductivity within 24 hrs of recharge event Rise in conductivity as vadose water drains Drop in conductivity as low-conductivity recharge enters saturated zone Rising conductivity during periods of static or falling water levels
34 Kewaunee Conductivity Variations Brown Manitowoc Calumet Well Avg DTW Sensor Depth Cond Min Cond Max Cond Range WL Range BN KW CA MN Three wells show rapid drops in fluid conductivity in response to recharge events Within 24 of major precipitation and/or melt events Within a few days of more gradual recharge events (spring melt)
35 Implications for Management Resource mangers should consider the timing of recharge events when developing best management practices for the application of animal wastes and sewage sludge. The fact that recharge water reaches the saturated zone very rapidly and that significant recharge occurs from December to April suggests that manure and sewerage sludge applied during the winter months has the potential to carry pathogens to the aquifer very rapidly.
36 Recharge & GW Vulnerability Studies in NE WI demonstrate that recharge reaches the aquifer within 1 to 2 days, with sediment thicknesses up to 18 ft Dodge County: Manure through 15+ feet of clay via cracks and pathways Review of midwestern and national literature suggests that clayey materials frequently contain fractures and macropores to significant depths
37 Clay faces coating soil structure Broken face of soil ped
38 Storm Water Concerns Hydrogeology of the Silurian aquifer is well understood Geologic setting makes this area especially vulnerable to groundwater contamination from activities at land surface Storm water (urban or rural) carries dissolved constituents that we really don t want in our drinking-water aquifers Altering drainage patterns or ponding water in new areas can lead to unintended consequences in karst areas
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