Joel Galloway, Ghaith Hamade, Gregory Jarrell 2000 Version 1.0, April 17, 2000 map Open-File Report USGS OFR00-471 Reston, VA U.S. Geological Survey https://water.usgs.gov/lookup/getspatial?ofr00471_ddwdpcon Michael Strobel, Joel Galloway, Ghaith Hamade, Greg Jarrell 2000 Hydrologic Investigations Atlas HA-745-E Rapid City, SD U.S. Geological Survey This data set represents potentiometric surface contours for the Deadwood aquifer, Black Hills, South Dakota. This data set was created as part of the Black Hills Hydrology Study (BHHS). The BHHS is a long-term investigation that was initiated in 1990 as a cooperative effort between the U.S. Geological Survey (USGS), the South Dakota Department of Environment and Natural Resources (DENR), and the West Dakota Water Development District. West Dakota represents various local and county cooperators. The purpose of the study is to assess the quantity, quality, and distribution of surface and ground water in the Black Hills area of western South Dakota (Driscoll, 1992). The study area includes parts of Butte, Custer, Fall River, Lawrence, Meade, and Pennington counties in South Dakota. Reviews_Applied_to_Data: This electronic report was subjected to the same review standard that applies to all U.S. Geological Survey reports. Reviewers were asked to check the topological consistency, tolerances, attribute frequencies and statistics, projection, and geographic extent. The reviewers checked the metadata and a_readme.1st files for completeness and accuracy. Related_Spatial_and_Tabular_Data_Sets: Potentiometric contours for the Madison, Minnelusa, Minnekahta, and Inyan Kara aquifers (mdsnpcon, mnlspcon, mnktpcon, inkrpcon) and data set of wells with water-level information (ddwdpwpt) for the Deadwood aquifer. Digital data set of spring locations in the Black Hills area (spngppt). Also, surficial hydrogeology in the Black Hills study area (hydrogeo). Other_References_Cited: Driscoll, D.G., 1992, Plan of study for the Black Hills Hydrology Study, South Dakota: U.S. Geological Survey Open-File Report 92-84, 10 p. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ARC/INFO format, this metadata file may include some ARC/INFO-specific terminology. 19980730 The contours were drawn with information on elevation, geologic outcrops, geologic structure, and water levels from wells drilled as of 1998. Complete None planned -104.03586344 -103.26997043 44.41080968 43.563932 USGS Thesaurus potentiometric water level contour hydrology ground water Deadwood Formation Deadwood aquifer inlandWaters ISO 19115 Topic Category geoscientificInformation inlandWaters environment USGS Metadata Identifier USGS:a015a131-359c-4aab-ba69-3d94a6efb842 Geographic Names Information System Black Hills South Dakota none These data should not be used at scales larger than 1:100,000 scale. Joel Galloway U.S. Geological Survey Hydrologist mailing and physical address

1608 Mt. View Rd.

Rapid City South Dakota 57702 USA 1-888-275-8747 (605) 355-4523 jgallowa@usgs.gov https://water.usgs.gov/GIS/browse/ofr00471_ddwdpcon.jpg Illustration of data set jpg Compilation of this data set and the associated metadata was funded in cooperation with the South Dakota Department of Environment and Natural Resources and the West Dakota Water Development District. SunOS, 5.6, sun4u UNIX ARC/INFO version 8.0.1 Joel Galloway, U.S. Geological Survey 2000 map USGS open-file report OFR00-471 Rapid City, South Dakota U.S. Geological Survey http://pubs.er.usgs.gov/usgspubs/ofr/ofr00471 Joel Galloway, U.S. Geological Survey 2000 map USGS open-file report OFR00-471 Rapid City, South Dakota U.S. Geological Survey https://water.usgs.gov/lookup/getspatial?ofr00471_spngppt Joel Galloway, U.S. Geological Survey 1999 report USGS open-file report OFR-99-602 Rapid City, South Dakota U.S. Geological Survey http://pubs.er.usgs.gov/usgspubs/ofr/ofr99602 Multiple visual checks were done to verify that the attribute data was coincident with the original source map. Chain-node topology present. This data set consists of potentiometric surface contours for the Deadwood aquifer in the vicinity of the Black Hills, South Dakota. Paper plots at 1:100,000 scale were overlaid on the original mylar sheet and contour lines were compared. Joel Galloway, U.S. Geological Survey unpublished material map none none Rapid City, South Dakota U.S. Geological Survey 100000 mylar map 1998 Ground condition based on well-data as of July 1998. none The potentiometric contours were digitized from the hand-drawn contours on this mylar base map. A point coverage representing wells open to the Deadwood aquifer (ddwdpwpt) and a point coverage of springs (spngppt) reselected for those discharging from the Deadwood aquifer were used in plotting water-level information on a mylar sheet at 1:100,000 scale with a boundary drawn for the Black Hills study area. This sheet was overlain on a mylar sheet of equivalent scale with elevation contours, and paper plots of geologic outcrops and geologic structure for the Deadwood Formation. These features and information were used in hand drawing contours representing water-level elevation. Water-level information from each well was considered when drawing the water-level elevation contours. Information from some wells was considered better than that from others because of variable accuracy describing location, altitude, and lithology of the wells. A numeric index was calculated for each well based on its respective accuracy (see attribute section in metadata file for data set "ddwdpwpt"). Where wells were clustered, water-level information from a well with a higher index value was given more weight in drawing the contour than that from a well with a lower index value. The mylar-based contours were then digitized. The coverage was then built as a line coverage using the Arc/Info BUILD command. Pseudo nodes were removed using the UNSPLIT NONE command in Arcedit. Some arcs became jagged after the UNSPLIT. These arcs were smoothed interactively in Arcedit. The coverage was then rebuilt. Attribute items were added to the coverage arc attribute table. The attribute item INTERP was used to indicate where lines were to be dashed on the map of potentiometric surface contours. Dashed lines, represented by an INTERP value of 'Y', indicate that water level was "interpreted" in the area, and was not known because of lack of measured water levels. Other line segments, where there was confidence in water level, were assigned a value of 'N' for the INTERP attribute item, indicating that water levels for these contours was not interpreted. These non-interpreted lines were drawn as solid lines on the map. An automated method was used to assign values to the attribute item INTERP based on proximity to a well with a known water level. Wells with water-level information for the Deadwood aquifer (ddwdpwpt) were buffered at 2000 meters, creating polygons of singular and in some cases overlapping, well buffers. Countour lines within the well buffers were assigned a value of 'N' to INTERP. Arc: BUFFER DDWD_WELLS DDWD_BUF2K # # 2000 # POINT Arc: IDENTITY DDWD_CON DDWD_BUF2K DDWD_CON2K LINE # JOIN In Tables: Enter command: SEL DDWD_CON2K.AAT Enter command: RES DDWD_BUF2K# NE 1 Enter command: MOVE 'N' TO INTERP Enter command: ASEL Enter command: MOVE 'Y' TO INTERP Enter command: Q STOP In some instances where contour lines were close around a well, the above method assigned values of 'N' to INTERP where they should be 'Y'. Arcedit was used to change values of INTERP for these lines back to 'Y', so that they would appear dashed on the map (water level interpreted). Attribute items that were joined to the arc attribute table and were associated with the IDENTITY well buffer coverage were dropped. In some instances, very short segments of contour lines fell within the buffer regions. Any segment that was less than 100 meters in length were assigned the INTERP value of the ajoining segments for consistancy. UNSPLIT INTERP was then run on the segments to remove pseudo nodes. 19980805 First draft of metadata created by gjarrell using FGDCMETA.AML ver. 1.33 07/15/99 on ARC/INFO data set /home/student/gja/meta/ddwdpcon 20000417 Vector String 227 Universal Transverse Mercator 13 0.9996 -105.00 0.00000 500,000 0.0000 coordinate pair 1.0 1.0 Meters North American Datum of 1927 Clarke 1866 6378206.4 294.98 > >DDWDPCON.AAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 FNODE# 4 5 B - > 5 TNODE# 4 5 B - > 9 LPOLY# 4 5 B - > 13 RPOLY# 4 5 B - > 17 LENGTH 4 12 F 3 > 21 DDWDPCON# 4 5 B - > 25 DDWDPCON-ID 4 5 B - > 29 INTERP 1 1 C - > 30 ALTITUDE 8 8 I - > > FNODE# - Internal number of from-node TNODE# - Internal number of to-node LPOLY# - Internal number of the left polygon; set to 0 for this data set because there are no polygons RPOLY# - Internal number of the right polygon; set to 0 for this data set because there are no polygons LENGTH - Length of arc in meters DDWDPCON# - Internal sequence number (i.e. the record number) of the arc in the ARC file DDWDPCON-ID- User-assigned feature ID INTERP- Item used for drawing solid and dashed contour lines. A value if 'Y' indicates that some interpretation was involved in drawing the contour line. A value of 'N' indicates that the contour line was drawn using water level information from a nearby well(s). ALTITUDE- Altitude of water level, in feet none U.S. Geological Survey Michael Ierardi mailing

445 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) mierardi@usgs.gov 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. Shape File Full coverage compressed 82 kb https://water.usgs.gov/GIS/dsdl/ofr00471_ddwdpcon_shp.zip Export Full coverage 105 kb https://water.usgs.gov/GIS/dsdl/ofr00471_ddwdpcon.e00.zip SDTS Full coverage zipped 1 https://water.usgs.gov/GIS/dsdl/ofr00471_ddwdpcon.tgz Other Full coverage zipped 1 https://water.usgs.gov/GIS/dsdl/ofr00-471_ddwdpcon_shp.tgz None. This dataset is provided by USGS as a public service. 20201117 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

445 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) mierardi@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998