The surface-water hydrologic system of the Rio Grande in the Albuquerque, New Mexico, area is composed of the Rio Grande; irrigation drains, laterals, canals, and ditches; evapotranspiration; and groundwater recharge. Two east-west cross sections were established to measure surface water entering the study area (north section) and exiting the study area (south section). Data for the calculation of surface-water discharge were collected once every 4 to 8 weeks from August 1989 through February 1995. Discharge of the Rio Grande at the north section ranged from 22 to 5,900 cubic feet per second. Discharge of the Rio Grande at the south section ranged from 21 to 6,060 cubic feet per second. Data from six areas (three grass-covered areas and three bare-soil areas) were collected for the calculation of evapotranspiration rates from February 1990 through August 1991. The evapotranspiration rate from the grass-covered areas ranged from 0.15 to 4.7 millimeters per day; the evapotranspiration rate from the bare-soil areas ranged from 0.13 to 6.4 millimeters per day.

Since 1993, the aquifer system in the Middle Rio Grande Basin, and particularly in the Albuquerque area, has been the focus of studies to further define the extent of the most productive parts of the aquifer and to gain a better understanding of ground-water/surface-water interactions. Twenty-one piezometers were installed during January and February 1997 at five sites in the Duranes well field area in Albuquerque, New Mexico, to allow for concentrated collection of hydraulic-head data. This concentrated collection of shallow hydraulichead data may lead to a better understanding of the effects of groundwater production on the Rio Grande near a City of Albuquerque well field. Each piezometer was installed in a hole augered by a rig using hollow-stem auger flights. All piezometers are constructed of flush-joint poly vinyl chloride casing with 5-foot poly vinyl chloride screens. The uppermost 2 feet of the piezometer casing is covered by a steel casing with a locking lid. Driller's logs and geophysical logs were collected from the deepest hole and piezometer, respectively, at each site. This report describes the piezometers installed and presents initial water-level data for all piezometers.

Multiply By To obtain inch 25.40 Millimeter foot 0.3048 Meter mile 1.609 Kilometer kPa 1.45X10'3 lbf/in2 Altitude in this report is based on the National Geodetic Vertical Datum of 1929 used on 7.5-minute topographic maps in the Albuquerque area. SYMBOLS AND TERMS CMR = combinable magnetic resonance K = average horizontal hydraulic conductivity (ft/day) Kv = average vertical hydraulic conductivity (ft/day) Ohmm = ohm-meter, a unit of resistivity or specific resistance gAPI = a unit of natural gamma radiation, calibrated in American Petroleum Institute (API) test facilities long-normal resistivity = (ohm-meterVmeter) short-normal resistivity = (ohm-meterVmeter) mmoh = moh-meter, a unit of conductivity kPa = kilopascals, a unit of pressure psi = pound-force per square inch, lbf/in2 IV

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