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FALSE
madison_002_permeability
002
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641764.870300
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GCS_WGS_1984
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20230612
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FGDC
Bureau of Economic Geology
10100 Burnet Rd. Bldg. 130
Austin
TX
78729
US
8-5
20230612
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10100 Burnet Rd. Bldg 139
Austin
Texas
78758
US
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Madison Permeability
<DIV STYLE="text-align:Left;"><P STYLE="text-align:Justify;font-size:16ptmargin:7 0 7 0;"><SPAN><SPAN>The development of karst, sink holes, caves, and solution breccias is common in the Madison Group, modifying the permeability. Movement along major faults and lineaments may have affected permeability over a large area and through time. Madison permeability is secondary to fracture permeability (Downey, 1984, 1986). Flow-net analysis assumes that a steady-state flow condition exists and no leakage is occurring from or to adjacent aquifers. The transmissivity is about 0,013 ft</SPAN></SPAN><SPAN><SPAN>2</SPAN></SPAN><SPAN><SPAN>/s (Konikow in Downey, 1984, 1986). Other studies suggest that some leakage from overlying rocks may be present and that the transmissivity value should be less than 0,013 ft</SPAN></SPAN><SPAN><SPAN>2</SPAN></SPAN><SPAN><SPAN>/s. According to Downey (1984, 1986), the variation in transmissivity values reported by several scientists is the result of local conditions and may not reflect the average on a regional scale. As a result of his analysis, Downey found that transmissivity values are related to porosity (fracturing porosity). A simulated transmissivity map by Downey (1986) was therefore added to the GIS data base. </SPAN></SPAN></P><DIV><P><SPAN /></P></DIV></DIV>
Permeability Map for Madison Group, Williston Bay
Downey, J. S., 1986, Geohydrology of bedrock aquifers in the northern Great Plains in parts of Montana, North Dakota, South Dakota and Wyoming: U.S. Geological Survey Professional Paper 1402-E, 87 p.
*
Downey, J. S., 1984, Geohydrology of the Madison and associated aquifers in parts of Montana, North Dakota, South Dakota and Wyoming: U.S. Geological Survey Professional Paper 1273-G, 47 p.
Williston Basin
Madison Group
Madison Group
Williston Basin
Access constraints: Restriction Code: other restrictions; Other Constraints: Access constraints: None
See access and use constraints information.
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