Michaela R. Johnson, Jennifer S. Stanton, James F. Cornwall, and Matthew K. Landon, U.S. Geological Survey 20020228 digital vector data USGS Open-File Report USGS OFR 02-88 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr0288_oct98 This arc and point data set contains streamflow-measurement sites and reaches indicating streamflow gain or loss under base-flow conditions along the Republican River and tributaries in Nebraska during October 25 to 28, 1998 (Boohar and others, 2000). The streamflow measurements were made to obtain data on ground-water/surface-water interaction. Flow was observed visually to be zero, was measured, or was estimated at 374 sites. The measurements were made on the main stem of the Republican River and all flowing tributaries that enter the Republican River between Swanson and Harlan County Reservoirs in the Nebraska part of the Republican River Basin. Tributaries were followed upstream until the first road crossing where zero flow was encountered. Measurements also included estimates of average wastewater discharge during the period when the flow measurements were made, based upon data obtained from towns having measureable wastewater discharge. For selected streams, points of zero flow upstream of the first zero flow site also were checked. Streamflow gain or loss for each stream reach was calculated by subtracting the streamflow values measured at the upstream end of the reach and values for contributing tributaries from the downstream value. The data obtained reflected base-flow conditions suitable for estimating streamflow gains and losses for stream reaches between sites. However, due to fluctuations in streamflow on the main stem of the Republican River above Swanson Reservoir during the measurement period, flow measurements on the main stem could not be used for calculating reach gains and losses. Flows measured on tributaries to the Republican River above Swanson Reservoir were of suitable quality to use for streamflow gain/loss calculations. Flows on Sappa Creek did not reflect base-flow conditions and thus were not suitable for investigating ground-water/surface-water interaction. This digital data set was created by manually splitting the lines from a 1:250,000 hydrography data set (Soenksen and others, 1999) at every streamflow-measurement site. Each set of stream segments between measurement sites was assigned a unique reach number. This data set was created to archive the calculated streamflow gains and losses of streams in the Republican River Basin, Nebraska, in October 1998, and make the data available for use with geographic information systems (GIS). This digital data set was created by manually plotting locations of streamflow measurements. These points were used to designate steam-reach segments to calculate gain/loss per river mile. Reach segments were created by manually splitting the lines from a 1:250,000 hydrography data set (Soenksen and others, 1999) at every location where the streams were measured. Each stream-reach segment between streamflow measurement sites was assigned a unique reach number. All other lines in the hydrography data set without reach numbers were omitted. Related_Spatial_and_Tabular_Data_Sets: Streamflow gain/loss in the Republican River Basin, Nebraska for: May 1975 (<http://water.usgs.gov/lookup/getspatial?ofr0279_may75>) July 1975 (<http://water.usgs.gov/lookup/getspatial?ofr0280_jul75>) October 1975 (<http://water.usgs.gov/lookup/getspatial?ofr0281_oct75>) October 1978 (<http://water.usgs.gov/lookup/getspatial?ofr0283_oct78>) April-May 1980 (<http://water.usgs.gov/lookup/getspatial?ofr0284_may80>) October 1980 (<http://water.usgs.gov/lookup/getspatial?ofr0285_oct80>) October 1981 (<http://water.usgs.gov/lookup/getspatial?ofr0286_oct81>) March 1989 (<http://water.usgs.gov/lookup/getspatial?ofr0287_mar89>) References Boohar, J.A., 2000, Water Resources Data, Nebraska, Water Year 1999: U.S. Geological Survey Water-Data Report NE-99-1, p. 323-329. Soenksen, P.J., Miller, L.D., Sharpe, J.B., and Watton, J.B., 1999, Peak- flow frequency relations and evaluation of the peak-flow gaging network in Nebraska: U.S. Geological Survey Water-Resources Investigations Report 99-4032, 47 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 ArcInfo format, this metadata file may include some ArcInfo-specific terminology. 19981025 19981028 Ground condition Complete None planned -102.11396913 -99.43321047 40.92298837 39.93417935 none Republican River Republican River Basin seepage run gain/loss streamflow low-flow investigations base flow inlandWaters none Republican River Basin Nebraska none The locations of stream-measurement points were digitized from 1:126,720-scale county road maps. The corresponding stream reaches were derived from a 1:250,000 hydrography coverage (Soenksen and others, 1999). If measurement sites are used separately from reaches, the maximum scale of 1:100,000 should not be exceeded. When used in conjunction with the reach segments, the maximum scale should not exceed 1:250,000. Michaela R. Johnson U.S. Geological Survey GIS Specialist Mailing and physical

Federal Building, Room 406

100 Centennial Mall North

Lincoln NE 68508 USA 1-888-275-8747 (402) 437-5139 mrjohns@usgs.gov The Nebraska Republican River Basin Management Districts and the Southwest Nebraska Resource Conservation and Development Area are thanked for their support of this project. The Nebraska Republican River Basin Management Districts include the Upper Republican, Middle Republican, Lower Republican, and Tri-Basin Natural Resources Districts (NRDs), and the Frenchman-Cambridge, Frenchman Valley, Hitchcock and Red Willow, and Nebraska Bostwick Irrigation Districts. The funding for this project was provided by a grant from the Nebraska Environmental Trust Fund to the Nebraska Republican River Basin Management Districts, U.S. Geological Survey cooperative matching funds, and funds from individual NRDs. Windows_NT, 4.0, Intel ArcInfo version 8.1 Accuracy of attributes was verified by checking against the original source data for streamflow measurements to ensure valid entries. Chain-node topology present. All measurements of streamflow under base-flow conditions in October 1998 were plotted. Reaches were determined between plotted October 1998 sites when there was measurable streamflow at both upstream and downstream sites. Accuracy of the location of the plotted stream measurements was not determined. Location was digitized from 1:126,720-scale paper county road maps. All stream- reach segments are in the same position as the original 1:250,000 source coverage. Boohar, J.A., U.S. Geological Survey 2000 table U.S. Geological Survey Water-Data Report NE 99-1 Lincoln, Nebraska U.S. Geological Survey Book 19981025 19981028 Ground condition Boohar (2000) tables from p. 323-329 Digitized locations of stream measurments from points hand- plotted on county road maps. RMSE was not determined. 19980826 Added site identity (SITEID) attributes to join table of measured streamflow. 20001121 Added reach identity (REACHID) to join stream-reach attributes from OCT98SEGS to point coverage, OCT98SEEP. REACHID is the SITEID of the downstream site defining the stream reach. 20001121 OCT98SEEP coverage streamflow measurement sites were overlaid on the streams coverage. Arcs were split at stream measurement sites in ArcView 3.2a. 20000307 Convert shapefile to Arc/Info coverage using SHAPEARC. 20000307 Added attributes to coverage assigning a unique ID to each stream segment and describing the streamflow characteristics for each reach. 20000310 Added SIG_TYPE describing the interpreted significance of streamflow gain or loss for each reach segment; stream reaches were classified as having significant gain, not significant gain, not significant loss, significant loss, and null (unable to determine). The streamflow gain or loss was considered significant if the absolute value exceeded the 5% uncertainty in the measured streamflow. 20000310 COPY oct98segs oct98 20020131 Combined streamflow-measurement sites (OCT98SEEP) and reach segments (OCT98SEGS) into one coverage with point and arc features ARCEDIT S:\REP_RIV\GIS\SEEPAGE\OCT98 get oct98seep;q;y;y; 20020131 BUILD OCT98 point BUILD OCT98 arc 20020131 First draft of metadata created by mrjohns using FGDCMETA.AML ver. 1.36 01/16/01 on ArcInfo data set s:\rep_riv\gis\seepage\oct98 20020131 Vector Point 374 String 208 Albers Conical Equal Area 29.5 45.5 -96 23 0.00000 0.00000 coordinate pair 22.07589375 22.07589375 Meters North American Datum of 1983 GRS1980 6378206.4 294.98 > >OCT98.PAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 4 12 F 3 > 5 PERIMETER 4 12 F 3 > 9 OCT98# 4 5 B - > 13 OCT98-ID 4 5 B - > 17 SITEID 4 5 B - > 21 FLOW1098 4 8 F 2 > 25 REACHID 8 20 F 0 > 33 UPSITEID 4 5 B - > 37 FLOW_ERR 4 8 F 4 > 41 NOTES 75 75 C - > 116 LAT 4 12 F 3 > 120 LON 4 12 F 3 > 124 GAGE 10 10 C - > 134 COUNTY 10 10 C - > AREA - Area of feature in meters; 0 for point feature. PERIMETER - Perimeter of feature in meters; 0 for point feature. OCT98# - Internal sequence number (i.e. the record number) of the arc in the ARC file. OCT98-ID - User-assigned feature ID. SITEID - Stream measurement identification (ID) number. Unique positive integer to designate stream measurement site at downstream end of reach. SITEID is not in downstream order. FLOW1098 - Streamflow measured at site in cubic feet per second. REACHID - Unique ID of stream segment between UPSITEID and SITEID; REACHID is SITEID of stream measurement site at downstream end of reach. REACHID is -9999 when there is no upstream site. UPSITEID - Unique ID of measurement site at upstream end of reach; UPSITEID is -9999 when there is no site upstream. FLOW_ERR - Uncertainty in flow measurement. The value is in units of cubic feet per second indicating uncertainty in the streamflow measurement (5% of measured streamflow); FLOW_ERR is -9999 when no flow is measured. NOTES - Text describing location of streamflow measurement and other additional information. LAT - Latitude of site in geographic coordinate system in DMS format. LON - Longitude of site in geographic coordinate system in DMS format. GAGE - Streamflow-gaging station ID where streamflow measurement was made at a gaging station. Record is blank if the measurement site was not a gaging station. COUNTY - Name of county in which streamflow measurement was made. > >OCT98.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 OCT98# 4 5 B - > 25 OCT98-ID 4 5 B - > 29 REACHID 4 5 B - > 33 GAINLOSS 4 8 F 2 > 37 GL_SIG 7 7 C - > 44 MILES 4 12 F 3 > 48 GL_MILES 4 12 F 3 > 52 SIG_TYPE 4 4 C 0 > > FNODE# - Internal number of from-node. TNODE# - Internal number of to-node. LPOLY# - Internal number of the left polygon. RPOLY# - Internal number of the right polygon. LENGTH - Length of arc in meters. OCT98# - Internal sequence number (i.e. the record number) of the arc in the ARC file. OCT98-ID - User-assigned feature ID. REACHID - Unique ID of stream segment between UPSITEID and SITEID; REACHID is SITEID of stream measurement site at downstream end of reach. REACHID is -9999 when there is no upstream site. GAINLOSS - Difference in streamflow measured at downstream site (SITEID) and upstream site (UPSITEID) plus tributary inflows. Positive or negative number in cubic feet per second where value is positive in gaining reach and negative in losing reach; GAINLOSS is -9999 when there is no flow at both sites or no upstream site. GL_SIG - Text indicating whether calculated streamflow gain/loss is greater than uncertainty (FLOW_ERR) in streamflow measurement. If the absolute value of gain/loss is greater than uncertainty, gain/loss is considered to represent a real change in streamflow and GL_SIG is 'yes'. If the absolute value of gain/loss is less than or equal to uncertainty, the gain/loss could reflect measurement uncertainty and GL_SIG is 'no'. MILES - Length of stream reach between SITEID and UPSITEID in miles determined from OCT98SEGS coverage; R_LENGTH is -9999 when no site upstream. GL_MILES - GAINLOSS per river mile with units of cubic feet per second per river mile. Positive or negative number where value is positive in gaining reach and negative in losing reach; GL_MILE is -9999 when there is no flow at both sites or no upstream reach. SIG_TYPE - Text describing the interpreted significance of gain/loss for each reach segment. > >SIG_TYPE Value > >Significant gain sg >Not significant gain nsg >Not significant loss nsl >Significant loss sl >Null null > none 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+ofr0288_oct98 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/ofr0288_oct98.e00.gz Other DLG file format zipped 1 http://water.usgs.gov/GIS/dsdl/ofr0288_oct98_sdts.tar.gz Other DLG file format zipped 1 http://water.usgs.gov/GIS/dsdl/ofr0288_oct98_shape.tar.gz 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+ofr0288_oct98 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998