Lorri A. Peltz Rose L. Medina Susan G. Buto 2005 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?nv_ha750nv Rush, F.E. 1974 map Nevada Department of Conservation and Natural Resources, Division of Water Resources Map Not applicable Carson City, NV Nevada Department of Conservation and Natural Resources, Division of Water Resources This data set consists of the administrative hydrographic area (HA) boundaries for Nevada at 1:750,000-scale and estimates of natural recharge, artificial recharge, pumpage, and net ground-water flow for each basin where the information is available. Formal hydrographic areas in Nevada were delineated systematically by the U.S. Geological Survey and Nevada Department of Conservation and Natural Resources, Division of Water Resources (NDWR) in the late 1960's (Rush, 1968; Cardinalli and others, 1968) for scientific and administrative purposes. The official hydrographic area names, numbers, and geographic boundaries continue to be used in U.S. Geological Survey scientific reports and NDWR administrative activities. Although the boundary lines between hydrographic areas generally coincide with true topographic basin divides, some of the lines are arbitrary divisions that have no topographic control. The pumpage, recharge, and interbasin flow estimates were derived from a variety of sources and methods. The data were tabulated and published by Lopes and Evetts in 2004. References Cited Cardinalli, J.L., Roach, L.M., Rush, F.E., and Vasey, B.J., comps., 1968, State of Nevada hydrographic areas: Nevada Department of Conservation and Natural Resources, Division of Water Resources map, scale 1:500,000. Lopes, T.J. and Evetts, D.M., 2004, Ground-water pumpage and artificial recharge for 2000 and average annual natural recharge and inter-basin flow by hydrographic area: U.S. Geological Survey Scientific Investigations Report 2004-5239, 81 p. Rush, F.E., 1968, Index to hydrographic areas in Nevada: Nevada Department of Conservation and Natural Resources, Division of Water Resources, Information Report 6, 38 p. Rush, F.E., 1974, Static ground water levels of Nevada: Nevada Department of Conservation and Natural Resources, Division of Water Resources map, 1 sheet, scale 1:750,000. This data set was created as part of a U.S. Geological Survey study, done in cooperation with the Nevada Division of Environmental Protection, to evaluate the susceptibility and vulnerability of ground water to anthropogenic contamination. The intended uses of this data set include, but are not limited to, natural resource modeling, mapping, and visualization applications. 1948 2000 publication date of source map and additional attribute information Complete None planned -120.136463 -113.793466 42.034788 34.990283 none hydrographic area hydrographic region hydrographic area boundary natural recharge artificial recharge interbasin flow pumpage net ground-water flow inlandWaters none Nevada Great Basin none Although this Federal Geographic Data Committee (FGDC) compliant metadata file is intended to document the data set in nonproprietary form, as well as ArcGIS format, this metadata file may include some ArcGIS-specific terminology. These data are not intended to be used as a survey product and are for reference purposes only. Acknowledgment of the U.S. Geological Survey and the Nevada Division of Environmental Protection would be appreciated in products derived from these data. U.S. Geological Survey Public Information Assistant mailing and physical address

333 W. Nye Lane

Carson City NV 89706 USA (775) 887-7600 (775) 887-7629 GS-W-NVpublic-info@usgs.gov Compilation of this data set and the associated metadata was done in cooperation with the Nevada Division of Environmental Protection. Technical review of this data set and metadata was provided by Douglas O. Shipley and Toby L. Welborn of the U.S. Geological Survey. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 9.0.0.580 F.E. Rush 1968 document Information Report 6 Carson City, NV Nevada Department of Conservation and Natural Resources, Division of Water Resources J.L. Cardinalli L.M. Roach F.E. Rush B.J. Vasey 1968 map Carson City, NV Nevada Department of Conservation and Natural Resources, Division of Water Resources 1:500,000-scale map Thomas J. Lopes David M. Evetts 2004 document U.S. Geological Survey Scientific Investigations Report 2004-5239 Reston, VA U.S. Geological Survey http://pubs.water.usgs.gov/sir2004-5239 All attempts were made to compare 100 percent of the digital attribute data to the original source publications. Verification was done by visual and manual comparison, combined with on-screen review, of the source with hard copy plots and tables. Frequency tests were run on the arc and polygon attributes to check that no features were unlabeled, misspelled, or inconsistent. Corrections were made until two visual and manual comparisons, combined with on-screen review, determined 100 percent of the digital attribute data matched the original source maps and tables. The logical consistency topologically is clean. Polygon and chain-node topology is present. Using ArcGIS Workstation commands and routines, all polygons were checked for closure, missing label points, multiple label points, sliver polygons, and duplicate features; all arcs were checked for node errors, overshoots, undershoots, dangles, intersections, and duplicate features. Complete at 1:750,000-scale for Nevada. All attempts were made to compare 100 percent of the digital spatial data to the original source map. Verification was done by visual and manual comparison, combined with on-screen review, of the source with hard copy plots. Corrections were made until two comparisons determined 100 percent of the digital spatial data matched the original source map. 350 meters Errors resulting from the quality of the source map, the automation process, and the scale resolution can impact the accuracy of the data. The errors resulting from the quality of the source map and the automation process are unknown. The inherent error of a 1:750,000-scale map is approximately 320 meters according to the National Map Accuracy Standards of 1947. The horizontal positional accuracy was verified by visual and manual comparison as described in the Horizontal_Positional_Accuracy_Report and the Process_Steps and matches the positional accuracy of the original source map. The horizontal positional error is deductively estimated at 350 meters. F.E. Rush 1974 map Carson City, NV Nevada Department of Conservation and Natural Resources, Division of Water Resources 750,000 paper 1974 publication date HA map spatial and attribute information T.J. Lopes D.M. Evetts 2004 U.S. Geological Survey Scientific Investigations Report 2004-5239 Reston, VA U.S. Geological Survey http://pubs.water.usgs.gov/sir2004-5239 digital tabular data 1948 2000 publication date Lopes and Evetts, 2004 attribute data The HA boundaries were digitized. There was no information documenting the process. HA Map 1992 1. 1:750,000-scale hard copy plots of the digitized HA map were generated. Using a light table, these plots were visually and manually compared with the HA map. 2. Corrections were made to the spatial data until two visual and manual comparisons, combined with on-screen review, determined there was no light between the original and digital lines and the attribute data matched the original source map. 3. Attribute accuracy was verified by two visual and manual comparisons, combined with on-screen review, of plots with the HA map. 4. Polygon and line topology was built using the ArcGIS Workstation command CLEAN with the fuzzy tolerance = 0.001 and dangle length = 0.01. 5. The data set was projected from Lambert, North American Datum of 1927 (NAD 27) to UTM, Zone 11, NAD 27 using the ArcGIS Workstation command PROJECT. HA Map 1995 1. Using ArcGIS Workstation, including the command LABELERRORS and the node error, arc dangle, and intersect environment, polygons were checked for closure, missing or multiple labels, sliver polygons, and duplicates. Arcs were checked for node errors, overshoots, undershoots, dangles, intersections, and duplicates. 2. Using the ArcGIS Workstation command CENTROIDLABEL, labels were centered within the respective polygon. 3. For polygons, the attribute HA750NV-ID was calculated to be a unique sequential integer equal to HA750NV# - 1. For lines, the attribute HA750NV-ID was calculated to be a unique sequential integer equal to HA750NV#. The attributes were checked for unlabeled, misspelled, or inconsistent feature labels. 4. Polygon and line topology was built using the ArcGIS Workstation command CLEAN with the fuzzy tolerance = 0.001 and dangle length = 0.01. HA Map 20040714 Metadata were structured and validated using metadata tools, MP and CNS, developed by Peter Schweitzer, U.S. Geological Survey. 20040714 1. Tabular information derived from Lopes and Evetts, 2004, table 2 was entered into Microsoft Excel and structured to allow the data to be joined to the digital hydrographic area attribute table. 2. The Excel table was saved in DBF format and converted to an INFO table using the ArcInfo Workstation command DBASEINFO. The resulting INFO table was appended to the hydrographic area attribute table using the JOINITEM command. Attribute accuracy was verified by two visual and manual comparisons of the tabular data with the source. 3. The metadata were edited to include the additional attributes and process steps. Lopes and Evetts, 2004 20041101 - 20041112 Vector Complete chain 810 Label point 259 GT-polygon composed of chains 259 Point 137 Universal Transverse Mercator 11 0.999600 -117.000000 0.000000 500000.000000 0.000000 coordinate pair 0.005659 0.005659 meters North American Datum of 1927 Clarke 1866 6378206.400000 294.978698 ha750nv.aat arc attribute table ESRI FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. FNODE# Internal node number for the beginning of an arc (from-node). ESRI Whole numbers that are automatically generated. TNODE# Internal node number for the end of an arc (to-node). ESRI Whole numbers that are automatically generated. LPOLY# Internal node number for the left polygon. ESRI Whole numbers that are automatically generated. RPOLY# Internal node number for the right polygon. ESRI Whole numbers that are automatically generated. LENGTH Length of feature in internal units. ESRI Positive real numbers that are automatically generated. HA750NV# Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. HA750NV-ID User-defined feature number. ESRI Whole numbers that are automatically generated. TYPE Line type User-defined 0 state line HA map 1 hydrographic-area line HA map 2 hydrographic-region line HA map ha750nv.pat polygon attribute table ESRI FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. AREA Area of feature in internal units squared. ESRI Positive real numbers that are automatically generated. PERIMETER Perimeter of feature in internal units. ESRI Positive real numbers that are automatically generated. HA750NV# Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. HA750NV-ID User-defined feature number. ESRI Whole numbers that are automatically generated. HYD-AREA Hydrographic-area identifier. User-defined 1 Pueblo Valley HA map 2 Continental Lake Valley HA map 3 Gridley Lake Valley HA map 4 Virgin Valley HA map 5 Sage Hen Valley HA map 6 Guano Valley HA map 7 Swan Lake Valley HA map 8 Massacre Lake Valley HA map 9 Long Valley HA map 10 Macy Flat HA map 11 Coleman Valley HA map 12 Mosquito Valley HA map 13 Warner Valley HA map 14 Surprise Valley HA map 15 Boulder Valley HA map 16 Duck Lake Valley HA map 17 Pilgrim Flat HA map 18 Painter Flat HA map 19 Dry Valley HA map 20 Sano Valley HA map 21 Smoke Creek Desert HA map 22 San Emidio Desert HA map 23 Granite Basin HA map 24 Hualapai Flat HA map 25 High Rock Lake Valley HA map 26 Mud Meadow HA map 27 Summit Lake Valley HA map 28 Black Rock Desert HA map 29 Pine Forest Valley HA map 30A Kings River Valley, Rio King Subarea HA map 30B Kings River Valley, Sod House Subarea HA map 31 Desert Valley HA map 32 Silver State Valley HA map 33A Quinn River Valley, Orovada Subarea HA map 33B Quinn River Valley, McDermitt Subarea HA map 34 Little Owyhee River Area HA map 35 South Fork Owyhee River Area HA map 36 Independence Valley HA map 37 Owyhee River Area HA map 38 Bruneau River Area HA map 39 Jarbidge River Area HA map 40 Salmon Falls Creek Area HA map 41 Goose Creek Area HA map 42 Marys River Area HA map 43 Starr Valley Area HA map 44 North Fork Area HA map 45 Lamoille Valley HA map 46 South Fork Area HA map 47 Huntington Valley HA map 48 Dixie Creek--Tenmile Creek Area HA map 49 Elko Segment HA map 50 Susie Creek Area HA map 51 Maggie Creek Area HA map 52 Marys Creek Area HA map 53 Pine Valley HA map 54 Crescent Valley HA map 55 Carico Lake Valley HA map 56 Upper Reese River Valley HA map 57 Antelope Valley HA map 58 Middle Reese River Valley HA map 59 Lower Reese River Valley HA map 60 Whirlwind Valley HA map 61 Boulder Flat HA map 62 Rock Creek Valley HA map 63 Willow Creek Valley HA map 64 Clovers Area HA map 65 Pumpernickel Valley HA map 66 Kelly Creek Area HA map 67 Little Humboldt Valley HA map 68 Hardscrabble Area HA map 69 Paradise Valley HA map 70 Winnemucca Segment HA map 71 Grass Valley HA map 72 Imlay Area HA map 73 Lovelock Valley HA map 73A Lovelock Valley, Oreana Subarea HA map 74 White Plains HA map 75 Bradys Hot Springs Area HA map 76 Fernley Area HA map 77 Fireball Valley HA map 78 Granite Springs Valley HA map 79 Kumiva Valley HA map 80 Winnemucca Lake Valley HA map 81 Pyramid Lake Valley HA map 82 Dodge Flat HA map 83 Tracy Segment HA map 84 Warm Springs Valley HA map 85 Spanish Springs Valley HA map 86 Sun Valley HA map 87 Truckee Meadows HA map 88 Pleasant Valley HA map 89 Washoe Valley HA map 90 Lake Tahoe Basin HA map 91 Truckee Canyon Segment HA map 92A Lemmon Valley, Western Part HA map 92B Lemmon Valley, Eastern Part HA map 93 Antelope Valley HA map 94 Bedell Flat HA map 95 Dry Valley HA map 96 Newcomb Lake Valley HA map 97 Honey Lake Valley HA map 98 Skedaddle Creek Valley HA map 99 Red Rock Valley HA map 100 Cold Spring Valley HA map 100A Cold Spring Valley, Long Valley HA map 101 Carson Desert HA map 101A Carson Desert, Packard Valley HA map 102 Churchill Valley HA map 103 Dayton Valley HA map 104 Eagle Valley HA map 105 Carson Valley HA map 106 Antelope Valley HA map 107 Smith Valley HA map 108 Mason Valley HA map 109 East Walker Area HA map 110A Walker Lake Valley, Schurz Subarea HA map 110B Walker Lake Valley, Lake Subarea HA map 110C Walker Lake Valley, Whisky Flat-Hawthorne Subarea HA map 111A Alkali Valley (Mineral), Northern Part HA map 111B Alkali Valley (Mineral), Southern Part HA map 112 Mono Valley HA map 113 Huntoon Valley HA map 114 Teels Marsh Valley HA map 115 Adobe Valley HA map 116 Queen Valley HA map 117 Fish Lake Valley HA map 118 Columbus Salt Marsh Valley HA map 119 Rhodes Salt Marsh Valley HA map 120 Garfield Flat HA map 121A Soda Spring Valley, Eastern Part HA map 121B Soda Spring Valley, Western Part HA map 122 Gabbs Valley HA map 123 Rawhide Flats HA map 124 Fairview Valley HA map 125 Stingaree Valley HA map 126 Cowkick Valley HA map 127 Eastgate Valley Area HA map 128 Dixie Valley HA map 129 Buena Vista Valley HA map 130 Pleasant Valley HA map 131 Buffalo Valley HA map 132 Jersey Valley HA map 133 Edwards Creek Valley HA map 134 Smith Creek HA map 135 Ione Valley HA map 136 Monte Cristo Valley HA map 137A Big Smoky Valley, Tonopah Flat HA map 137B Big Smoky Valley, Northern Part HA map 138 Grass Valley HA map 139 Kobeh Valley HA map 140A Monitor Valley, Northern Part HA map 140B Monitor Valley, Southern Part HA map 141 Ralston Valley HA map 142 Alkali Spring Valley (Esmeralda) HA map 143 Clayton Valley HA map 144 Lida Valley HA map 145 Stonewall Flats HA map 146 Sarcobatus Flat HA map 147 Gold Flat HA map 148 Cactus Flat HA map 149 Stone Cabin Valley HA map 150 Little Fish Lake Valley HA map 151 Antelope Valley HA map 152 Stevens Basin HA map 153 Diamond Valley HA map 154 Newark Valley HA map 155A Little Smoky Valley, Northern Part HA map 155B Little Smoky Valley, Central Part HA map 155C Little Smoky Valley, Southern Part HA map 156 Hot Creek Valley HA map 157 Kawich Valley HA map 158A Emigrant Valley, Groom Lake Valley HA map 158B Emigrant Valley, Papoose Lake Valley HA map 159 Yucca Flat HA map 160 Frenchman Flat HA map 161 Indian Springs Valley HA map 162 Pahrump Valley HA map 163 Mesquite Valley HA map 164A Ivanpah Valley, Northern Part HA map 164B Ivanpah Valley, Southern Part HA map 165 Jean Lake Valley HA map 166 Hidden Valley HA map 167 Eldorado Valley HA map 168 Three Lakes Valley (Northern Part) HA map 169A Tikapoo Valley (Tickaboo Valley), Northern Part HA map 169B Tikapoo Valley (Tickaboo Valley), Southern Part HA map 170 Penoyer Valley HA map 171 Coal Valley HA map 172 Garden Valley HA map 173A Railroad Valley, Southern Part HA map 173B Railroad Valley, Northern Part HA map 174 Jakes Valley HA map 175 Long Valley HA map 176 Ruby Valley HA map 177 Clover Valley HA map 178A Butte Valley, Northern Part HA map 178B Butte Valley, Southern Part HA map 179 Steptoe Valley HA map 180 Cave Valley HA map 181 Dry Lake Valley HA map 182 Delamar Valley HA map 183 Lake Valley HA map 184 Spring Valley HA map 185 Tippett Valley HA map 186A Antelope Valley (White Pine and Elko), Southern Part HA map 186B Antelope Valley (White Pine and Elko), Northern Part HA map 187 Goshute Valley HA map 188 Independence Valley (Pequop Valley) HA map 189A Thousand Springs Valley, Herrill Siding--Brush Creek Area HA map 189B Thousand Springs Valley, Toano--Rock Spring Area HA map 189C Thousand Springs Valley, Rocky Butte Area HA map 189D Thousand Springs Valley, Montello--Crittenden Creek. Area (Montello Valley) HA map 190 Grouse Creek Valley HA map 191 Pilot Creek Valley HA map 192 Great Salt Lake Desert HA map 193 Deep Creek Valley HA map 194 Pleasant Valley HA map 195 Snake Valley HA map 196 Hamlin Valley HA map 197 Escalante Desert HA map 198 Dry Valley HA map 199 Rose Valley HA map 200 Eagle Valley HA map 201 Spring Valley HA map 202 Patterson Valley HA map 203 Panaca Valley HA map 204 Clover Valley HA map 205 Lower Meadow Valley Wash HA map 206 Kane Springs Valley HA map 207 White River Valley HA map 208 Pahroc Valley HA map 209 Pahranagat Valley HA map 210 Coyote Spring Valley HA map 211 Three Lakes Valley HA map 212 Las Vegas Valley HA map 213 Colorado River Valley HA map 214 Piute Valley HA map 215 Black Mountains Area HA map 216 Garnet Valley (Dry Lake Valley) HA map 217 Hidden Valley (North) HA map 218 California Wash HA map 219 Muddy River Springs Area (Upper Moapa Valley) HA map 220 Lower Moapa Valley HA map 221 Tule Desert HA map 222 Virgin River Valley HA map 223 Gold Butte Area HA map 224 Greasewood Basin HA map 225 Mercury Valley HA map 226 Rock Valley HA map 227A Fortymile Canyon, Jackass Flats HA map 227B Fortymile Canyon, Buckboard Mesa HA map 228 Oasis Valley HA map 229 Crater Flat HA map 230 Amargosa Desert HA map 231 Grapevine Canyon HA map 232 Oriental Wash HA map HYD-AREA-NAME Hydrographic-area name. User-defined Names. See attribute HYD-AREA. SUBAREA-NAME Hydrographic-area subarea name. User-defined Names. See attribute HYD-AREA. HYD-REGION Hydrographic-region number. User-defined 1 Northwest Region HA map 2 Black Rock Desert Region HA map 3 Snake River Basin HA map 4 Humboldt River Basin HA map 5 West Central Region HA map 6 Truckee River Basin HA map 7 Western Region HA map 8 Carson River Basin HA map 9 Walker River Basin HA map 10 Central Region HA map 11 Great Salt Lake Basin HA map 12 Escalante Desert HA map 13 Colorado River Basin HA map 14 Death Valley Basin HA map HYD-REGION-NAME Hydrographic-region name. User-defined Names. See attribute HYD-REGION. AREA-MI Area of feature in miles squared. User-generated Positive real numbers that are generated from the attribute AREA. DESIGNATED Identifies the designation status of the ground-water basin. Evetts and Lopes, 2004 Yes The basin's permitted ground water rights approach or exceed the estimated average annual recharge. The Nevada State Engineer is authorized by Nevada Revised Statute 534.120 to designate a ground-water basin and to declare preferred uses within such designated basins. The State Engineer has additional authority in the administration of the water resources within a designated ground-water basin. Office of the State Engineer, Nevada Department of Conservation and Natural Resources, Division of Water Resources. No The ground-water basin has not been designated by the State Engineer Office of the State Engineer, Nevada Department of Conservation and Natural Resources, Division of Water Resources. NATRECH_H Quantity of estimated natural recharge (highest published estimate) Lopes and Evetts, 2004 3 146,000 Acre-feet per year (-9999: no data/no estimate available, -8888: Hydrographic Subarea - total included in first occurrence of the hydrographic area. Details are outlined in the comments for each subarea.) NATRECH_L Quantity of estimated natural recharge (lowest published estimate) Lopes and Evetts, 2004 100 85,000 Acre-feet per year (-9999: no data/no estimate available, -8888: Hydrographic Subarea - total included in first occurrence of the hydrographic area. Details are outlined in the comments for each subarea.) ARTRECH Total artificial recharge in the basin. Lopes and Evetts, 2004 0 37,650 Acre-feet per year (-9999: no data/no estimate available, -8888: Hydrographic Subarea - total included in first occurrence of the hydrographic area. Details are outlined in the comments for each subarea.) NETIBFLOW Estimate of net interbasin flow in the basin. Inflow are positive and outflow are negative values. Lopes and Evetts, 2004 -44,800 33,700 Acre-feet per year (-9999: no data/no estimate available, -8888: Hydrographic Subarea - total included in first occurrence of the hydrographic area. Details are outlined in the comments for each subarea.) PUMPAGE Estimate of total ground water pumped from the basin. Lopes and Evetts, 2004 0 -94,820 Acre-feet per year (-9999: no data/no estimate available, -8888: Hydrographic Subarea - total included in first occurrence of the hydrographic area. Details are outlined in the comments for each subarea.) NETFLOW_H The net ground-water flow (high estimate). Calculated as the sum of the high natural recharge (natrech_h), net interbasin flow (netibflow), and total pumpage (pumpage). Calculated only for basins where an estimate of net interbasin flow is available. Lopes and Evetts, 2004 -85,820 162,110 Acre-feet per year (-9999: no data/no estimate available, -8888: Hydrographic Subarea - total included in first occurrence of the hydrographic area. Details are outlined in the comments for each subarea.) NETFLOW_L The net ground-water flow (low estimate). Calculated as the sum of the low natural recharge (natrech_l), net interbasin flow (netibflow), and total pumpage (pumpage). Calculated only for basins where an estimate of net interbasin flow is available. Lopes and Evetts, 2004 -91,120 84,110 Acre-feet per year (-9999: no data/no estimate available, -8888: Hydrographic Subarea - total included in first occurrence of the hydrographic area. Details are outlined in the comments for each subarea.) COMMENTS Comments about the recharge, interbasin flow, pumpage and net ground-water flow. user-defined Text. > >HA750NV.PAT: Polygon Attribute Table > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 8 18 F 5 > 9 PERIMETER 8 18 F 5 > 17 HA750NV# 4 5 B - > 21 HA750NV-ID 4 5 B - > 25 HYD-AREA 4 4 C - > 29 HYD-AREA-NAME 30 30 C - > 59 SUBAREA-NAME 30 30 C - > 89 HYD-REGION 2 2 I - > 91 HYD-REGION-NAME 30 30 C - > 121 AREA-MI 4 12 F 2 > 125 DESIGNATED 13 13 C - > 138 NATRECH_H 8 12 F 0 > 146 NATRECH_L 8 11 F 0 > 154 ARTRECH 8 9 F 0 > 162 NETIBFLOW 8 11 F 0 > 170 PUMPAGE 8 10 F 0 > 178 NETFLOW_H 8 12 F 0 > 186 NETFLOW_L 8 12 F 0 > 194 COMMENTS 86 86 C - HYD-AREA is the hydrographic-area number. HYD-AREA-NAME is the hydrographic-area name. SUBAREA-NAME is the hydrographic-area subarea name. HYD-REGION is the hydrographic-region number. HYD-REGION-NAME is the hydrographic-region name. AREA-MI is the area in miles squared. DESIGNATED is the designation status of the basin. NATRECH_H is the highest natural recharge estimate from published sources. NATRECH_L is the lowest natural recharge estimate from published sources. ARTRECH is the total artificial recharge in the basin. NETIBFLOW is the sum of interbasin flow estimates. Inflow are positive and outflow are negative values. PUMPAGE is the total pumpage in the basin. NETFLOW_H is the sum of high natural recharge, total artificial recharge, net interbasin flow, and total pumpage. Calculated only for basins where interbasin flow is estimated. NETFLOW_L is the sum of low natural recharge, total artificial recharge, net interbasin flow, and total pumpage. Calculated only for basins where interbasin flow is estimated. COMMENTS are explanation of recharge, interbasin flow, and pumpage. >HA750NV.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 HA750NV# 4 5 B - > 29 HA750NV-ID 4 5 B - > 33 TYPE 1 1 I - > TYPE is line type: > 0 = state line > 1 = hydrographic area line > 2 = hydrographic region line provided above U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Downloadable Data 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 these data, software, or related materials. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners. WinZipped ARCE spatial and attribute information WinZip 0.688 http://water.usgs.gov/GIS/dsdl/nv_ha750nv.e00.zip None. This data set is provided by USGS as a public service. 20041115 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+nv_ha750nv FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998