Greene, D.C., and Wolfe, W.J. 1998 Series_Name N/A Issue_Identification N/A Reston, Virginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?diffus This dataset represents aquifer diffusivity based on the streamflow-recession index areas from Bingham (1986). To provide information on spatial patterns of ground-water residence time, ground-water storage, and stream response to rainfall. Applications might include models of streamflow and ground-water (or contaminant) infiltration, movement, and storage. Procedures_Used: The 1:500,000 scale mylar maps from Bingham (1986), were scanned into a 200 dpi grayscale TIF image on a PC using a Contex FSS-3012t scanner. The image was then georeferenced in Arc/Info using the REGISTER and RECTIFY commands. The georeferenced images were used in ArcEdit as a backdrop for interactive on screen digitizing. The digitized linework was cleaned and built as a polygon coverage. The polygons were attributed with the recession index as reported by Bingham (1986). The coverage was then intersected with a 1:100,000-stream coverage for Tennessee. Stream mileage and square mileage area was attributed to each polygon. For each polygon, the following formulae were used to calculate diffusivity: DD = drainage density = stream_mileage / square_mileage diffusivity = ( 0.933 * (DD / 2)^2 ) / recession_index Revisions: none Reviews_Applied_to_Data: none Related_Spatial_and_Tabular_Data_Sets: none Other_References_Cited: Bingham, R.H., 1986, Regionalization of winter-flow characteristics of Tennessee streams: U.S. Geological Survey Water-Resources Investigations Report 86-4007, 88 p. Notes: none Unknown n/a complete none planned -90.311203 -81.64650726 36.67723846 34.97607803 None aquifer, diffusivity, recession index areas inlandWaters None State of Tennessee None None None None n/a The coverage was created from a base map scale of 1:500,000 and should be used only in situations appropriate for that scale. William J. Wolfe U.S. Geological Survey mailing and physical address

640 Grassmere Park Drive,Suite 100

Nashville TN 37211 USA 1-888-275-8747 (615) 837-4799 wjwolfe@usgs.gov 8:00am-4:30pm CST Please contact by email n/a None Unclassified None Windows_NT, 5.0, Intel NT, ARC/INFO version 8.0.2 Bingham, R.H. 1986 Map WRIR 86 4007 Nashville, TN U.S. Geological Survey See Entity_Attribute_Information See Explanation Attribute accuracy is described, where present, with each attribute defined in the Entity and Attribute Section. Polygon and chain-node topology present. n/a unknown n/a Bingham, R.H. 1986 500,000 digital 1996 None N/A USGS The 1:500,000-scale mylar maps from Bingham (1986), were scanned into a 200 dpi grayscale TIF image on a PC using a Contex FSS-3012t scanner. None 1997 None The image was georeferenced in ArcInfo using REGISTER and RECTIFY. None 1997 None The image was used as a backdrop in ArcEdit for on screen digitizing. The digitized linework was cleaned and built as a polygon coverage. None 1997 None The polygons were attributed with the recession index Bingham (1986). None 1998 None The coverage was intersected with 1:100,000 streams. Stream mileage and square mileage area was attributed to each polygon. Diffusity was attributed to each polygon using the following formula: DD = drainage density = stream_mileage / square_mileage diffusivity = ( 0.933 * (DD / 2)^2 ) / recession_index None 1998 None Vector Point 68 String 207 GT-polygon composed of chains 69 0.000278 0.000278 Decimal Degrees North American Datum of 1983 GRS1980 6378206.4 294.98 DIFFUS.PAT Polygon attribute table Computed and Bingham (1986) Shape Polygon attribute table Computed and Bingham (1986) Positive real numbers 2-dimensional element GIS software AREA Area of poly/region in square coverage units Computed Positive real numbers Area of region in coverage units GIS software PERIMETER Perimeter of poly/region in coverage units Computed Positive real numbers Perimeter of region in coverage units GIS software DIFFUS# Internal feature number Computed Sequential unique positive integer Internal feature number GIS software DIFFUS-ID User-assigned feature number User-defined Integer User-assigned feature number GIS software POLY-REC-INDEX Streamflow-recession index Bingham (1986) Positive number Streamflow-recession index Bingham (1986) DRAINAGE-DENSITY Drainage density Computed Positive number Drainage density Computed DIFFUSIVITY Diffusivity Computed Positive number DIFFUSIVITY Computed MILES-DRAINAGE Mileage of streams Computed Positive number Mileage of streams Computed SQ-MILE-AREA Square mileage Computed Positive number Square mileage Computed The <coverage>.PAT data file contains four data fields. POLY-REC-INDEX is the streamflow-recession index for that polygon as reported by Bingham, 1986. DRAINAGE-DENSITY is the miles of stream per square mile in that polygon. DIFFUSIVITY is the aquifer diffusivity calculated for that polygon based on the formula in the Procedures section of this document. MILES-DRAINAGE is the mileage of streams for that polygon. SQ-MILE-AREA is the square mileage contained in that polyon. Not Available U.S. Geological Survey Ask USGS - Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Export Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/diffus.e00.gz Other Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/diffus.sdts.tgz None. This dataset is provided by USGS as a public service. 20041108 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+diffus FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998