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SGMA Climate Change Desktop tools for IWFM and Modflow

This presentation at the CWEMF Annual Meeting on April 23rd, 2019 will introduce the IWFM and MODFLOW desktop tools for analyzing climate change impacts on water resources. The tools facilitate processing of climate data provided by DWR and help develop projected water budgets using numerical models. Relevant information and datasets will be shared, along with demonstrations of the tools in action.

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SGMA Climate Change Desktop tools for IWFM and Modflow

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  1. Craig Cooledge Water Resources Engineer Jacobs Engineering CWEMF Annual Meeting April 23rd 2019 SGMA Climate Change Desktop tools for IWFM and Modflow

  2. Introduction

  3. DWR-Provided Information DWR Climate Change Analysis Background WSIP Datasets: https://data.cnra.ca.gov/dataset/climate-change-projections-wsip-2030-2070

  4. Development of Projected Water Budgets • 23 CCR §354.18 (e)Each Plan shall rely on the best available information and best available science to quantify the water budget for the basin in order to provide an understanding of historical and projected hydrology, water demand, water supply, land use, population, climate change, sea level rise, groundwater and surface water interaction, and subsurface groundwater flow.

  5. Climate Data and Tools • VIC gridded change factors for precipitation and reference evapotranspiration • Monthly timeseries dataset from 1915 – 2011 • Desktop tools for IWFM and MODFLOW based models to facilitate processing of climate data provided by DWR

  6. Data available on SGMA Data Viewer https://sgma.water.ca.gov/webgis/?appid=SGMADataViewer

  7. Methodology

  8. Projected Water Budget Development with a Numerical Model

  9. IWFM and MODFLOW Desktop Tools – Climate Change Data Processing • ArcGIS Toolbox based tools • Relates VIC grid to MODFLOW Grid/IWFM elements, small watersheds, or other regions • Project historic data under future climate scenarios • Produces MODFLOW/IWFM input files for climate change scenario simulations

  10. Tool Showcase

  11. IWFM Tool • Tools are executed in ArcCatalog or ArcMap • Documentation provided with tool describing input requirements and tool execution Tool #1: Establish working directory and input data for IWFM model Tool #2: Relate IWFM Model to VIC Model and Perturb Historic Input Data

  12. Tool #2 IWFM Tool Snapshots Tool #1

  13. IWFM Input Data Development Considerations • ET data can be aggregated spatially and temporally • Compute time-varying ET based on based on repeating pattern of input data (IWFM 4000 Flag) • May require additional GIS attributes or lookup tables to relate data spatially • Projected Small Watersheds Data • Single dataset can be processed for elements and small watersheds

  14. MODFLOW Tool • Tools are executed in ArcCatalog or ArcMap • Documentation provided with tool describing input requirements and tool execution Tool #1: Establish working directory and input data for MODFLOW model Tool #2: Relate MODFLOW Model to VIC Model and Perturb Historic Input Data

  15. MODFLOW Tool Snapshots Tool #1 Tool #2

  16. MODFLOW Input Data Development Considerations • Model Arrays Require Specific File Naming Convention • Tool determines Month and Year based on filename • Model Array File Delimiter • Tool will decipher the delimiter that is used (space, comma, etc.) • Needs to be consistent throughout all files • Should be consistent with MODFLOW friendly formats

  17. Additional desktop tools

  18. Streamflow Change Factor Correction Tool • Spreadsheet tool to assist in perturbing basin unimpaired streamflow under climate conditions • 2nd order correction calculation to ensure monthly timing and annual pattern of streamflow hydrograph is consistent with climate change simulations

  19. CalSim II to C2VSim Diversion Lookup • Effort to map CalSim II Diversions to C2VSim Diversions • Incorporate changes in deliveries based on CVP/SWP system operations under projected hydrology • Released in the near future

  20. DWRSGMA Resources • SGMA Data and Tools: • https://water.ca.gov/Programs/Groundwater-Management/Data-and-Tools • SGMA Climate Change Resources: • https://data.cnra.ca.gov/dataset/sgma-climate-change-resources • Climate Change Documentation: • https://water.ca.gov/Programs/Groundwater-Management/SGMA-Groundwater-Management/Best-Management-Practices-and-Guidance-Documents Other Related DWR Modeling Tools • IWFM: • https://water.ca.gov/Library/Modeling-and-Analysis/Modeling-Platforms/Integrated-Water-Flow-Model • C2VSim: • https://water.ca.gov/Library/Modeling-and-Analysis/Central-Valley-models-and-tools/C2VSim • SVSIM: • https://water.ca.gov/Library/Modeling-and-Analysis/Central-Valley-models-and-tools/SVSim

  21. Thank you! Craig Cooledge Craig.Cooledge@Jacobs.com Water Resources Engineer Jacobs Engineering Tyler Hatch, PhD, PE Tyler.Hatch@water.ca.gov Senior Engineer, Water Resources Sustainable Groundwater Management Program

  22. CADWR CA_DWR calwater cadepartmentofwaterresources Follow DWR on social media

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