Link to USGS home
Open-File Report 2006-1284

Prepared in cooperation with the Southern Nevada Water Authority
and the Bureau of Reclamation

Physical and Chemical Water-Quality Data from Automatic Profiling Systems, Boulder Basin, Lake Mead, Arizona and Nevada, Water Years 2001–04

By Ryan C. Rowland, Craig L. Westenburg, Ronald J. Veley, and Walter E. Nylund

Download the report as a PDF (1 Mb): OFR2006-1284

USGS water-quality profiling system

ABSTRACT

Water-quality profile data were collected in Las Vegas Bay and near Sentinel Island in Lake Mead, Arizona and Nevada, from October 2000 to September 2004. The majority of the profiles were completed with automatic variable-buoyancy systems equipped with multiparameter water-quality sondes. Profile data near Sentinel Island were collected in August 2004 with an automatic variable-depth-winch system also equipped with a multiparameter water-quality sonde. Physical and chemical water properties collected and recorded by the profiling systems, including depth, water temperature, specific conductance, pH, dissolved-oxygen concentration, and turbidity are listed in tables and selected water-quality profile data are shown in graphs.

Contents

Abstract

Introduction

Purpose and Scope

Equipment

Profiling Systems

System Maintenance

Methodology

Data Collection

Data Processing

Records Computation

References Cited

 

Figures

1. Map showing profiling system locations in Las Vegas Bay and near Sentinel Island, Boulder Basin, Lake Mead, Arizona and Nevada

2. Map showing profiling system locations in Las Vegas Bay, Lake Mead, Arizona and Nevada

3. Graph showing Lake Mead elevation during period of data collection

4. Schematic diagram of variable-buoyancy-profiling system

5. Photos of variable-depth-winch system components mounted to a t-frame

6. Data processing flowchart for automatic-profile data

7. Plots of physical and chemical water-quality properties in selected profiles recorded at Las Vegas Bay site 1, Lake Mead, Arizona and Nevada

8. Plots of physical and chemical water-quality properties in selected profiles recorded at Las Vegas Bay site 2, Lake Mead, Arizona and Nevada

9. Plots of physical and chemical water-quality properties in selected profiles recorded at Las Vegas Bay site 3, Lake Mead, Arizona and Nevada

10. Plots of physical and chemical water-quality properties in selected profiles recorded at Sentinel Island site, Lake Mead, Arizona and Nevada

Tables

1. Location and period of operation for the Las Vegas Bay and Sentinel Island water-quality profiling systems

2. Calibration criteria for sensors used to measure physical and chemical water-quality properties in profiles at Las Vegas Bay and near Sentinal Island, Lake Mead, Arizona and Nevada

3. Manufacturer specifications for sensors used to measure physical and chemical water-quality properties in profiles in Las Vegas Bay and near Sentinel Island, Lake Mead, Arizona and Nevada

4. Station identification number, station name, and period of record for automatic-profile site target depths, Lake Mead, Arizona and Nevada

5. Maximum allowable limits for applying data corrections to near-continuous water-quality data

6. Criteria for rating near-continuous water-quality data

7. Data quality ratings for physical and chemical water-quality properties measured in profiles at Las Vegas Bay and Sentinel Island sites, Lake Mead, Arizona and Nevada

8. Physical and chemical water-quality data in profiles at Las Vegas Bay site 1, October 1, 2000–July 9, 2001

9. Physical and chemical water-quality data in profiles at Las Vegas Bay site 2, September 6, 2001–June 19, 2002

10. Physical and chemical water-quality data in profiles at Las Vegas Bay site 3, April 4, 2003–September 30, 2004

11. Physical and chemical water-quality data in profiles at Sentinel Island site, January 24, 2002–September 30, 2004

12. Total water depth measured at Las Vegas Bay sites and at Sentinel Island site, Lake Mead, Arizona and Nevada

 

Send questions or comments about this report to the author, Ron J. Veley

For more information about USGS activities in Nevada, visit the USGS Nevada Water Science Center home page.



U.S. Department of the Interior, U.S. Geological Survey
Persistent URL: http://pubs.usgs.gov/of/2006/1284/index.htm
Page Contact Information: Publications Team
Last modified: Saturday, 12-Jan-2013 22:16:45 EST
FirstGov button Take Pride in America button