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One-month Stress Period Considerations

One-month Stress Period Considerations. Presentation to ESHMC 8 January 2008 B. Contor. Courtesy Rick Raymondi. Outline. MODFLOW & PEST considerations Recharge tool considerations Data considerations. MODFLOW & PEST considerations. 1. Meaning of “Stress Period”.

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One-month Stress Period Considerations

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  1. One-month Stress PeriodConsiderations Presentation to ESHMC 8 January 2008 B. Contor

  2. Courtesy Rick Raymondi

  3. Outline • MODFLOW & PEST considerations • Recharge tool considerations • Data considerations

  4. MODFLOW & PEST considerations 1. Meaning of “Stress Period”

  5. MODFLOW & PEST considerations 2. Meaning of “Time Step”

  6. MODFLOW & PEST considerations 3. Observations occur when they occur

  7. MODFLOW & PEST considerations • Model output is interpolated to times of observations

  8. MODFLOW & PEST considerations 5. Match is calculated at the time theobservation occurred

  9. Something to think about: Recharge Parameters FORTRAN Rech. Tool Aquifer Parameters PEST Aquifer Parameters MODFLOW MODFLOW ESPAM 2.0 Process? ESPAM 1.X Process

  10. Something to think about: ~ 200 Aquifer Parameters runtime w/ 44 stress periods: a few seconds PEST MODFLOW Total PEST runtime about 12 hrs. ESPAM 1.X Process

  11. Something to think about: ??? Recharge Parameters runtime w/ 324 stress periods: ??? runtime w/ 44 stress periods: a few minutes FORTRAN Rech. Tool ??? Aquifer Parameters runtime w/ 324 stress periods: ??? MODFLOW Total PEST runtime ???? ESPAM 2.0 Process?

  12. Overview of Recharge Tool

  13. Review of Recharge Tool • GIS tool • ArcGIS 8.x or 9.x • GW Modeling Toolbar (ArcGIS extension) • ESPAM.exe • FORTRAN tool • Readinp.exe

  14. Review of Recharge Tool • GIS tool • ArcGIS 8.x or 9.x • GW Modeling Toolbar • ESPAM.exe • FORTRAN tool • Readinp.exe Data handling Calculations

  15. Start Creating Output Tables Model Grid Output Tables in Specific Format Input Data GIS Points GIS Lines GIS Polygons GIS Rasters GIS Tool Tables (Stolen from May Training slides)

  16. .mdl - simulation and scenario information .cel - model grid information .pch - perched reaches .trb - tributary underflow .cnl - canal seepage data .sol - soils .pre - precipitation .div - diversions and returns .fpt - fixed point sources and withdrawals .off - offsite ground water pumping .ent - irrigation entities .iar - irrigated agriculture .eti - irrigated lands evapotranspiration .red - irrigation discount table .nir - recharge on non-irrigated lands .spt - scenario sources and withdrawals Output files Created by GIS Tool (Stolen from May Training slides)

  17. .pch - perched reaches .trb - tributary underflow .cnl - canal seepage data .pre - precipitation .div - diversions and returns .fpt - fixed point sources and withdrawals .off - offsite ground water pumping .iar - irrigated agriculture .eti - irrigated lands evapotranspiration .red - irrigation discount table .nir - recharge on non-irrigated lands .spt - scenario sources and withdrawals GIS tool explicitly represents every stress period:

  18. .mdl - simulation and scenario information .cel - model grid information .ent - irrigation entities .sol - soils data GIS tool uses single representation for entire simulation:

  19. .pch - perched reaches .pre - precipitation .div - diversions and returns* .fpt - fixed point sources and withdrawals .off - offsite ground water pumping .eti - irrigated lands evapotranspiration .spt - scenario sources and withdrawals Native data frequencyis one month or better * interpolation will be required for a few small entities

  20. .mdl - simulation and scenario information .cel - model grid information .sol - soils .iar - irrigated agriculture .red - irrigation discount table .cnl - canal seepage data* .ent -entity data Data frequency longer than one month but this matches physical reality * maybe

  21. .trb - tributary underflow .nir - recharge and non-irrigated lands Data frequency is longer than one month, adjustment may be needed

  22. END Courtesy Rick Allen

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