Claire Bunch Brandon Forbes 20210222 .csv Denver, CO U.S. Geological Survey https://doi.org/10.5066/P99AW51U The dataset contains data from two GPS surveys conducted after a flow event on September 8, 2020, at the USGS streamgage 09471580 - San Pedro River at St David, AZ. The first survey, conducted on October 14, 2020, documents CSA cross section geometry, CSA pin elevations, and high-water marks at CSA cross sections from the flow event in the CSA reach downstream from the gage (09471588 - San Pedro River below Dragoon Wash at St David, AZ). The second survey, conducted on December 8, 2020, documents CSA pin elevations and additional high-water marks in the CSA reach from the flow event on September 8, 2020, and the elevation of the thalweg from the CSA reach to the streamgage (09471580) at the bridge. Gage height and discharge data are collected at U.S. Geological Survey streamgage 09471580 - San Pedro River at St David, AZ. A flow event occurred on September 8, 2020. Two GPS surveys were conducted on October 14 and December 8, 2020, to document cross section geometry, thalweg elevations, sensor locations, and high-water marks from the flow event at CSA 09471588 - San Pedro River below Dragoon Wash at St David, AZ, and streamgage 09471580 - San Pedro River at St David, AZ. The data were collected to compute peak discharge for the September 8, 2020, flow event using the slope-area method; however, due to significant scatter in HWM elevations and minimal fall throughout the reach, a slope-area peak discharge measurement was not computed from the survey data. Continuous slope-area (CSA) sensors collect stage data in two reaches downstream from streamgage 09471580. CSA 09471587 - Dragoon Wash above San Pedro River at St David, AZ, is instrumented with CSA sensors at three cross sections. CSA 09471588 - San Pedro River below Dragoon Wash at St David, AZ, is located downstream from the confluence of Dragoon Wash and the San Pedro River and is instrumented with CSA sensors at four cross sections. The CSA reaches were installed to measure peak discharge for stage-discharge rating development for streamgage 09471580. The CSA sensors were installed on June 21, 2018. The flow event on September 8, 2020, was not high enough on Dragoon Wash for the sensors to record data, so no survey was conducted at CSA 09471587 for this flow event. 20201014 20201208 ground condition Complete As needed -110.25493 -110.23810 31.91450 31.90314 USGS Thesaurus Flood stage High-water marks GPS USGS Metadata Identifier USGS:5ff8a081d34ea5387df04346 Geographic Names Information System (GNIS) Cochise County San Pedro River Saint David, AZ none none Claire Bunch U.S. Geological Survey Hydrologist mailing and physical

520 North Park Avenue Suite 221

Tucson AZ 85719 United States (520) 670-6671 cebunch@usgs.gov U.S. Geological Survey, Arizona Department of Transportation Brandon T. Forbes Claire E. Bunch 2021 Lidar data exchange file https://doi.org/10.5066/P93OY3DQ No formal attribute accuracy tests were conducted No formal logical accuracy tests were conducted Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. Longitude: 0.009 m, Latitude: 0.007 m (OPUS determined) Orthometric height: 0.059 m (OPUS determined) Base station file sent to OPUS on 11/2/2020. Base station coordinates from 12/8/2020 survey were corrected to orthometric height based on OPUS solution, and 12/8/2020 survey data were OPUS corrected within Leica software. An issue with Leica equipment prevented 10/14/2020 survey from being OPUS corrected within the software. OPUS corrections were applied to 10/14/2020 survey by determining corrections to Ortho Height and N and E using 12/8/2020 values. Corrected N and E for 10/14/2020 survey were loaded in Global Mapper and exported in latitude/longitude. 20201102 Claire Bunch U.S. Geological Survey Hydrologist mailing and physical

520 N Park Ave

Tucson AZ 85719 United States (520) 670-6671 cebunch@usgs.gov Not applicable Not applicable Decimal degrees NAD_83(2011)(EPOCH:2010.0000) Geodetic Reference System 1980 6378137.000000 298.257222 NAVD88 (Computed using GEOID18) Not applicable feet Explicit elevation coordinate included with horizontal coordinates 09471580_20201014_20201208_GPSSurveys.csv Comma Separated Value (CSV) file containing data. Dataset contains northing, easting, latitude, longitude, orthometric height, code, and survey date for GPS surveys on 10/14/2020 and 12/8/2020. Producer defined Point ID Survey point identifier. Producer defined Each surveyed point is given a sequential identifier. A prefix of SP (San Pedro) is used to identify the river reach. For cross section points and HWMs, point identifier codes for SAC (Slope-Area Computation) are used (https://water.usgs.gov/software/SAC/doc/SAC_GUI-FS_2012-3112.pdf). For continuous slope-area pin and thalweg elevations, point ID is assigned sequentially in downstream order. Northing State Plane NAD 83 Northing in State Plane Coordinate System, Arizona East (FIPS 201), NAD83. Producer defined 329540.0106 330793.5577 international feet Easting State Plane NAD 83 Easting in State Plane Coordinate System, Arizona East (FIPS 201), NAD83. Producer defined 674103.0096 675117.7139 international feet Latitude N NAD83 Latitude in NAD_83(2011). Producer defined 31.9059658 31.90940991 Longitude W NAD83 Longitude in NAD_83(2011). Producer defined -110.250127 -110.246854 Orthometric Height NAVD88 Orthometric Height in NAVD88 (Computed using GEOID18). Producer defined 3573.8474 3583.0343 feet Code Survey point descriptor. Producer defined San Pedro XS Cross section geometry point at San Pedro River. Producer defined San Pedro CSA pin Continuous slope-area pin elevation at CSA 09471588 - San Pedro River below Dragoon Wash at St David, AZ. Producer defined San Pedro HWM High-water mark (uncertainty unspecified) at San Pedro River. Producer defined San Pedro Good HWM Good (+/-0.10 ft) high-water mark at San Pedro River. Producer defined San Pedro Fair HWM Fair (+/-0.20 ft) high-water mark at San Pedro River. Producer defined San Pedro Poor HWM Fair (+/-0.40 ft) high-water mark at San Pedro River. Producer defined San Pedro thalweg Elevation of thalweg of San Pedro River. Producer defined Survey Date Date survey was conducted. Producer defined 10/14/2020 Survey date. Producer defined 12/8/2020 Survey date. Producer defined U.S. Geological Survey - ScienceBase U.S. Geological Survey - ScienceBase mailing and physical

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 USA 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P99AW51U None 20210222 Claire Bunch U.S. Geological Survey Hydrologist mailing and physical

520 North Park Avenue Suite 221

Tucson AZ 85719 United States 520-670-6671 cebunch@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998