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Modeling Issues with In-Delta Agricultural Uses

Figure IV.2-6. DSM2 results on the source water and salinity (“volumetric and constituent fingerprints) for the period November 2004 to February 2005. Reproduced from DWR (2005). Modeling Issues with In-Delta Agricultural Uses. Drainage salinity Drainage volume Net depletion.

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Modeling Issues with In-Delta Agricultural Uses

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  1. Figure IV.2-6. DSM2 results on the source water and salinity (“volumetric and constituent fingerprints) for the period November 2004 to February 2005. Reproduced from DWR (2005).

  2. Modeling Issues with In-Delta Agricultural Uses • Drainage salinity • Drainage volume • Net depletion

  3. Figure IV.2-1. Approximate sampling locations of agricultural drainage salinity by DWR's Municipal Water Quality Investigation Program, data collected between 1986 and 1997. Data available at http://wdl.water.ca.gov/wq-gst/

  4. Figure IV.2-2. Agricultural drainage salinity in south and southeast Delta. Drainage salinity at different pump stations on the same island (e.g. Kings Island) could be significantly different.

  5. Figure IV.2-5. Model input and recent measurements of agricultural drainage salinity in the Delta.

  6. Observations Wide scatter of drainage salinity: • between islands • between years • between months Model input could be significantly different from field measurements Source tracking could be a solution

  7. Issues • Drainage salinity • Drainage volume • Net depletion

  8. Jung, M. And Q. Tran. 1998. Delta island drainage volume estimates, 1954-1955 versus 1995-1996. Report to DWR, MWQI Program.

  9. Jung, M. And Q. Tran. 1998. Delta island drainage volume estimates, 1954-1955 versus 1995-1996. Report to DWR, MWQI Program.

  10. Jung, M. And Q. Tran. 1998. Delta island drainage volume estimates, 1954-1955 versus 1995-1996. Report to DWR, MWQI Program.

  11. Issues • Drainage salinity • Drainage volume • Net depletion

  12. Observations Drainage salinity • Highly variable (season, island, year) • Higher salinity assumed in model Drainage volume • Large difference in 2 field estimates Net depletion • Uncertainty of even a few hundred cfs could lead to large difference in simulated salinity

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