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Delta Flows: Data and Calibrations

This report by Cathy Ruhl from the US Geological Survey's California Water Science Center highlights the evolution and recalibration of Delta flow measurements. It examines key metrics for identifying optimal study periods amidst hydrologic variability, focusing on historical data from various Delta locations. It details innovative hydroacoustic instrumentation and the significance of real-time data availability for hydrology studies. The findings, supported by numerous funding sources, emphasize the importance of continuous data collection for managing California's water resources effectively.

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Delta Flows: Data and Calibrations

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  1. Delta Flows:Data and Calibrations Cathy Ruhl US Geological Survey California Water Science Center, Sacramento, CA

  2. Many Thanks! • Funding Provided By: • IEP • CALFED • DWR • Contra Costa Water • District • City of Stockton • Sacramento Regional • Water Treatment Plant

  3. DSM2 Recalibration • Metrics for identifying optimal periods • Hydrology • Wide Hydrologic Variability • Range of Export Rates • Variability in Delta-Cross Channel Gate Operations • Variability in South Delta Temporary Barrier Operations • Density of Data • Continuity of Data • Days to weeks • Confidence in Data

  4. Evolution of the Network • 1987: Old River and Middle River • 1992: Walnut Grove • 1996: Delta Outflow • 1999: South Delta • 2001: North Delta • 2005: South Delta • 2006: Central Delta

  5. Short Term Data Sets • Early South Delta / Dye Studies • Spring / Summer 1997, 1998, 1999 • Confluence Study • Fall 1998 • Grizzly Bay • Summer to Summer 1999 - 2000 • Delta Cross Channel Studies • Fall 2000, 2001, 2002, 2005 • Mildred Island • Summer / Fall 2001 • Franks Tract • Spring / Summer 2002

  6. Hydroacoustic Instrumentation • Ultrasonic Velocity Meters (UVM) • Acoustic Doppler Velocity Meters (ADVM) • Horizontal Profiling Capability • Sideward-looking (long-term deployment) • Upward-looking (short-term deployment)

  7. Hydroacoustic Instrumentation • Ultrasonic Velocity Meters (UVM) • Innovative application • Constrained deployment configurations

  8. Acoustic Doppler Velocity Meter Flexible Deployment Configuration Hydroacoustic Instrumentation

  9. Hydroacoustic Instrumentation • In-Situ Deployments • Flexible locations • Short-term only

  10. Data Availability

  11. Real-Time Data USGS – NWIS Web Unit Values – last 31 days only Daily Values – updated daily http://waterdata.usgs.gov/ca/nwis CDEC http://cdec.water.ca.gov Special Studies Records USGS – Jon Burau or Cathy Ruhl jrburau@usgs.gov caruhl@usgs.gov Historical Long-Term Monitoring Record USGS – NWIS Web Daily Values – updated daily http://waterdata.usgs.gov/ca/nwis USGS – Information Officer (Tom Haltom) (916) 278-3100, tchaltom@usgs.gov USGS – Unit Values Warehouse National effort – expected in December 2007 BDAT http://bdat.ca.gov/ Data Availability

  12. Many Thanks! • Funding Provided By: • IEP • CALFED • DWR • Contra Costa Water • District • City of Stockton • Sacramento Regional • Water Treatment Plant

  13. Evolution of the Network • 1987: Old River and Middle River • 1992: Walnut Grove • 1996: Delta Outflow • 1999: South Delta • 2001: North Delta • 2005: South Delta • 2006: Central Delta

  14. DSM2 Recalibration • Metrics for identifying optimal periods • Hydrology • Wide Hydrologic Variability • Range of Export Rates • Variability in Delta-Cross Channel Gate Operations • Variability in South Delta Temporary Barrier Operations • Density of Data • Continuity of Data • Days to weeks • Confidence in Data

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