Eric Warmath, Rose L. Medina 2001 Version 1.0, September, 2001 vector digital data Carson City, NV U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?hydmain_hum This data set contains the main stem of the Humboldt River as defined by Humboldt Project personnel of the U.S. Geological Survey Nevada District, 2001. The data set was digitized on screen using digital orthophoto quadrangles from 1994. This dataset was created as a layer of a geographic information system (GIS) to calculate river miles on the Humboldt River. The currentness and accuracy of the digital orthophoto quadrangle (DOQ) source exceeded that of other available data. Reviews The digital data in this data set has gone through a rigorous, multi-level, quality-control process that ensures the data set is a fair representation of the source map. If errors are found in this data set, it will be appreciated if the user would pass this information to the Metadata_Contact. Two formal reviews were done. The reviewers were asked to check metadata and other documentation files for completeness and accuracy. Reviewers were asked to check the topological consistency, tolerances, projections, and geographic extent. Notes 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. References Environmental Systems Research Institute, Inc. (ESRI), 2001, ArcInfo Version 8.1 Help: Redlands, California, [on-line documentation]. Jones, Clifford Z., Rowe, Timothy G., Sexton, Robert J., and Tanko, Daron J., 2000, Water resources data, Nevada, water year 1999: U.S. Geological Survey Water-Data Report NV-99-1, 569 p. U.S. Geological Survey, 1994, Digital Orthophoto Quadrangles: Reston, Virginia, U.S. Geological Survey. 1994 ground condition Complete None planned. -118.48910048 -115.24805961 41.0676875 40.04854653 none hydrology stream river inlandWaters none Nevada Humboldt River None. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data. Use with similarly scaled data. U.S. Geological Survey Rose L. Medina Physical Scientist mailing and physical address

333 West Nye Lane, Rm. 203

Carson City NV 89706 USA 1-888-275-8747 (775) 887-7629 rlmedina@usgs.gov IRIX64, 6.5, IP27 UNIX ArcInfo version 8.0.1 U.S. Geological Survey Unknown remote-sensing image Reston, VA U.S. Geological Survey http://eros.usgs.gov/products/aerial/doq.html Two visual checks were done to verify that the digital attribute data is a fair representation of the original source data. Chain-node topology present. This data set contains the main stem of the Humboldt River as defined by Humboldt Project personnel of the U.S. Geological Survey Nevada District, 2001. Two visual checks were done to verify that the digital data is a fair representation and interpretation of the original source data. 7 Meters The hydrology was digitized on screen from DOQs. The error inherent from the DOQs is at least 1 meter on the x-y. Errors derived from the quality of the original map or encountered during the automation process also can impact the accuracy of this data. The maximum error is estimated at 7 meters on the x-y. Environmental Systems Research Institute, Inc. (ESRI) 2001 none Redlands, CA ESRI online 2001 publication date none explanation of ESRI commands Jones, Clifford Z., Rowe, Timothy G., Sexton, Robert J., and Tanko, Daron J. 2000 none Carson City, NV U.S. Geological Survey paper 1999 ground condition none land surface elevation for Rye Patch Reservoir U.S. Geological Survey Unknown remote-sensing image Reston, VA U.S. Geological Survey http://eros.usgs.gov/products/aerial/doq.html CD-ROM 1994 ground condition DOQ spatial information 1. ERDAS Imagine 8.3.1 was used to import DOQs from USGS DOQ format and USGS geo-tiff format into ERDAS Imagine(R) format. The data was digitized from DOQs in North American Datum (NAD) 1983, Universal Transverse Mercator (UTM) zone 11 projection. 2. The main channel, major perennial channels, significant intermittent channels, and water bodies of the Humboldt River were digitized on screen from the DOQs using the ArcInfo(R) ArcEdit module. The tolerances used were: weedtolerance = .025, grain = 0.5, nodesnap closest = 15. The RMS error is dependent on the DOQ. 2a. Rye Patch Reservoir was digitized to what appears to be the normal level of 4,135 feet (Jones and others, 2000). This was compared to elevation values derived from USGS 10-meter digital elevation models (DEM) of the area. Discrepancies existed and the decision was made to go with the photo interpretative results. Since 1994 was a dry year, the reservoir was low and the upper portion of the channel was visible. The river was digitized along the visible channel and as a centerline through the reservoir as indicated by Humboldt River Project Chief Russ Plume and agreed upon by Glen Hess, Nevada District Surface Water Specialist. 2b. The boundaries of several intermittent water bodies were digitized to show the terminus of distributary water features and also show that along the lower system watercourses had to be full for water to continue flowing along its course. If there was no indication of a channel through water bodies along the Humboldt River course, a centerline was digitized. In the lower portion of the river, the land is relatively flat. Comparisons were made between USGS 10-meter DEMs and the interpretive photo work. No serious conflicts were found. The interpretative photo work was thought to be more accurate. 2c. All or a portion of major agricultural ditches and diversions along the course of the Humboldt River, especially in the vicinity of Lovelock, were digitized. At the request of Russ Plume, Project Chief, water discharge ditches from a mine northwest of Battle Mountain were also digitized. 2d. According Russ Plume, Glen Hess, and Carl Thodal, the endpoint of the Humboldt River was determined to be at the USGS gage at the last bridge, located near the west edge of the 1:24,000-scale Wildhorse Pass quadrangle. 3. Portions of tributary streams to the Humboldt River were digitized on screen from the DOQs using the ArcInfo(R) ArcEdit module. The tolerances used were: weedtolerance = .025, grain = 0.5, nodesnap closest = 15. The RMS error is dependent on the DOQ. 3a. The following tributary streams were digitized to 1 or more quadrangle sheet boundaries at 1:24,000-scale: Marys River, Starr Creek, Soldier Secret Creek, Lamoille Creek, North Fork Humboldt River, South Fork Humboldt River (exception: this feature was stopped at a dam), Dixie Creek, Tenmile Creek, Susie Creek, Maggie Creek, Marys Creek, Pine Creek, Rock Creek, Reese River, Kelly Creek, Little Humboldt River, and Clear Creek. 3b. Portions of tributary streams from the main channels to the Humboldt River were digitized to either correct alignment, indicate confluences, or to join them to the 1:100,000-scale Digital Line Graph (DLG) stream line work. 3c. On some of the tributary streams, numerous channels existed where the stream would flow in times of flood or normal flow. An effort was made to digitize a representative pattern of the drainage channels in these areas. A primary channel and other significant channels with indications of recent flow were used. Also included were areas where new alternate flow routes exist. 4. The attributes MAINSTEM-CODE and MAINSTEM-DESC were added using the ArcInfo (R) ADDITEM command. These attributes include a numeric code and a description of the code, which describes the centerline as braid, main stem, etc. and whether it is perennial or intermittent. The main channel of the Humboldt River is attributed as main stem, until the determined end of the river, where it is then attributed as an extended channel to the Humboldt Sink/Lake. Below this point, the main stem channel centerline is not attributed. The channel below this point shows the maximum flow extent possible for the river system. Ditches, braids, and distributaries associated with this channel are attributed. Determination of the status of non-main stem channels or braids of the Humboldt River as perennial or intermittent was a subjective process. If water or evidence of recent flow such as pools or wetness was evident, a segment was assigned a value of perennial. Springs, and agricultural or mining runoff also influenced the decision. Since 1994 was a dry year and the photography was taken during the summer any channel with water was considered perennial. Intermittent channels along the middle Humboldt River were not digitized unless associated with tributary streams. No effort was spent determining the perennial or intermittent status of tributary streams. 5. The attribute NAME was added using the ArcInfo (R) ADDITEM command. Names were added using USGS topographic maps at 1:24,000-scale. 6. Several visual inspections were performed and corrections were made as deemed necessary. A check was made to determine continuity of data. Dangle nodes were all checked and determined to be at the ends of lines only. Intersection errors were cleaned up using the ArcInfo(R) ArcEdit module. Line topology was built using the ArcInfo(R) CLEAN command (ESRI, 2001). 7. Attributes were checked visually using ArcView 3.1. Consistency of spelling, abbreviation, and the relationship between main stem code and number was checked. Stream names were checked using USGS topographic maps at 1:24,000-scale. 8. Attribution of the main channel of the Humboldt River was confirmed by either Russ Plume or Glen Hess. 9. Line topology was built using the ArcInfo(R) CLEAN command with the fuzzy tolerance = 0.001 and dangle = 0.01 (ESRI, 2001). 11011999-03282000 1. The DOQ hydrology data set was projected from UTM Zone 11 NAD 83 to UTM Zone 11 NAD 27 using the ArcInfo(R) PROJECT command. 2. Using the ArcInfo(R) ArcEdit module, the DOQ hydrology data was combined with the existing 1:100,000-scale DLG data to form one continuous hydrology data set for the Humboldt River basin. The DOQ hydrology replaced existing 1:100,000-scale hydrology data in the combined data set. 3. Using the ArcInfo(R) RESELECT command, a new data set with only the main stem of the Humboldt River was created: "RESELECT MAINSTEM-CODE = 1 AND NAME = 'Humboldt River'" 4. Using the ArcInfo(R) ArcEdit module: 4a. The field LENGTH-MI was addded to the arc attribute table using the ArcInfo(R) ADDITEM command: "ADDITEM LENGTH-MI 8 18 F 5" 4b. The field LENGTH-MI was populated by converting the field LENGTH (in meters) to miles: "CALC LENGTH-MI = LENGTH * .00062137119" 4c. Using the ArcInfo(R) MAKEROUTE command, the route HUMRIV was defined and the measures were computed using the field LENGTH-MI: "MAKEROUTE HUMRIV 1 LENGTH-MI" 5. Line topology was built using the ArcInfo(R) CLEAN command with the fuzzy tolerance = 0.001 and dangle = 0.01 (ESRI, 2001). 03302000-04032000 Vector String 507 Universal Transverse Mercator 11 coordinate pair 0.001 0.001 Meters North American Datum of 1927 Clarke 1866 6378206.4 294.98 >HYDMAIN_HUM.AAT: Arc Attribute Table > >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 8 18 F 5 > 25 HYDMAIN_HUM# 4 5 B - > 29 HYDMAIN_HUM-ID 4 5 B - > 33 SOURCE-SCALE 4 10 I - > 37 MAINSTEM-CODE 2 2 I - > 39 MAINSTEM-DESC 20 20 C - > 59 NAME 30 30 C - > 89 LENGTH-MI 8 18 F 5 FNODE# is the internal number of from-node. TNODE# is the internal number of to-node. LPOLY# is the internal number of polygon to left of arc. RPOLY# is the internal number of polygon to right of arc. LENGTH is the length of arc in coverage units. HYDMAIN_HUM# is a program-generated feature identity number of arc. HYDMAIN_HUM-ID is a user-assigned feature identity number of arc. SOURCE-SCALE is the source scale of the arc. 12 = 1:12,000-scale MAINSTEM-CODE is the numeric code to describe the arc. MAINSTEM-DESC is the descriptive information of arc. >MAINSTEM-CODE MAINSTEM-DESC > 1 Main Stem NAME is the name of the arc. LENGTH-MI is the length of arc in miles. >HYDMAIN_HUM.NAT: Node Attribute Table > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 ARC# 4 5 B - > 5 HYDMAIN_HUM# 4 5 B - > 9 HYDMAIN_HUM-ID 4 5 B - ARC# is the internal number which identifies the arc to which a node belongs. This is the field HYDMAIN_HUM# from HYDMAIN_HUM.AAT. HYDMAIN_HUM# is a program-generated feature identity number of node. HYDMAIN_HUM-ID is a user-assigned feature identity number of node. >HYDMAIN_HUM.RATHUMRIV: Route Attribute Table > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 HUMRIV# 4 5 B - > 5 HUMRIV-ID 4 5 B - HUMRIV# is a program-generated feature identity number of route. HUMRIV-ID is a user-assigned feature identity number of route. >HYDMAIN_HUM.SECHUMRIV: Section Attribute Table > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 ROUTELINK# 4 5 B - > 5 ARCLINK# 4 5 B - > 9 F-MEAS 4 12 F 3 > 13 T-MEAS 4 12 F 3 > 17 F-POS 4 12 F 3 > 21 T-POS 4 12 F 3 > 25 HUMRIV# 4 5 B - > 29 HUMRIV-ID 4 5 B - ROUTELINK# is the internal number which identifies the route to which a section belongs. This is the field HUMRIV# from HYDRO_MAIN.RATHUMRIV. ARCLINK# is the internal number which identifies the arc to which a section belongs. This is the field HYDRO_MAIN# from HYDRO_MAIN.AAT. F-MEAS is the from-measure of the section based on its position within a route. It was populated using the ArcInfo(R) MAKEROUTE command which used field LENGTH-MI from HYDRO_MAIN.AAT to calculate value. T-MEAS is the to-measure of the section based on its position within a route. It was populated using the ArcInfo(R) MAKEROUTE command which used field LENGTH-MI from HYDRO_MAIN.AAT to calculate value. F-POS is the from-position of section on arc, represented as a percentage of the arc on which the section lies. T-POS is the to-postion of section on arc, represented as a percentage of the arc on which the section lies. HUMRIV# is a program-generated feature identity number of section. HUMRIV-ID is a user-assigned feature identity number of section. 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://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/hydmain_hum.e00.gz Other Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/hydmain_hum.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+hydmain_hum FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998