1. State of Calibration for California Central Valley Groundwater-Surface Water Simulation Model (C2VSim)
CWEMF 2019 Annual Meeting
Folsom, CA
Presenter: Mesut Cayar
April 23, 2019

2. Calibration Process Model Input Data QA/QC & Update
Sensitivity Analysis
- Water Demand & Supply
- Soil Parameters
- Aquifer Parameters
- Stream Parameters
- Storage Coefficients (Subsidence)
IWFM Demand Calculator (IDC) Calibration
- Land Use
- Rootzone Budget
Water Budget Update & Refinement
- Water Use & Supply Budget
- Groundwater Budget
Groundwater & Surface Water Calibration
- GW Heads Distribution
- GW Levels & Trends
- Streamflow
- Stream Aquifer Interaction
- Subsidence

3. Focus Area for Calibration
Update Map
Hydrologic Regions
Sacramento River
San Joaquin River
Excluding Delta (Subregion 9)

4. Calibration Activities Since Beta Release
Model Input Data QA/QC & Update
Verified and corrected stream inflow
Refined urban demand data
Updated ET and precipitation data
Updated soil parameters and ET for small watersheds
Refined land use data based on local models
Updated initial groundwater levels (above and below Corcoran) in San Joaquin and Tulare Basins
Fixed various data bugs

5. Calibration Activities Since Beta Release
Water Budget Update & Refinement
Reviewed and mapped available local model data to C2VSim
Adjusted water demand and supply data as-necessary
Refined IDC calibration
Soil parameter adjustments
ET updates
Refinement of reuse and return flows based on available data
Refinement of rice operations
Reviewed and assessed water demand and supply data at monthly level
Re-configured surface water delivery areas
Verified/updated surface water deliveries based on available Local/State/Federal data
Turned off pumping for elements that are known to not pump historically
Re-distributed pumping between above and below Corcoran Clay based on available data

6. Turlock Sub-Basin (Subregion 12)
Review and map available local model data to C2VSim
Reviewed and mapped available local model data to C2VSim

7. Butte, Wyandotte Creek, & Yuba Sub-Basins (Subregion 5)
Adjusted water demand and supply data as-necessary
Non-Ponded Ag. Supply Requirement
Non-Ponded SW Supply
Non-Ponded GW Pumping
Ponded Ag. Supply Requirement
Adjusted water demand and supply data as-necessary
Refined of IDC calibration
Soil parameter adjustments
ET updates
Refinement of reuse and return flows based on available data
Refinement of rice operations
Reviewed and assessed water demand and supply data at monthly level
Re-configured surface water delivery areas
Verified/updated surface water deliveries based on available Local/State/Federal Data
Ponded SW Supply
Ponded GW Pumping

8. Colusa Sub-Basin (Subregion 3)
Adjusted water demand and supply data as-necessary
Re-configured surface water delivery areas
Verified/updated surface water deliveries based on available Local/State/Federal Data

9. Delta Mendota Sub-Basin (Subregion 10)
Adjusted water demand and supply data as-necessary

10. Calibration Activities Since Beta Release
GW Level Calibration & Sensitivity Analysis
Adjusted small watershed parameters for baseflow and sw contributions
Reviewed and assessed sensitivity of gw levels against water budgets, small watershed contributions and aquifer parameters
Aquifer parameters pre-calibration analysis
Horizontal and vertical hydraulic conductivity
Storage coefficients
Reviewed and assessed groundwater budgets

11. Overall Status of Groundwater Conditions & Calibration

12. Selected Groundwater Level Hydrographs
Faults

13. Selected Groundwater Level Hydrographs
Vertical K

14. Selected Groundwater Level Hydrographs
Rice Fields

15. Selected Groundwater Level Hydrographs
Missing SW supply

16. Selected Groundwater Level Hydrographs
Drop down in sw supplies. SW deliveries are verified so should look into rice et, return flow and deep perc

17. Selected Groundwater Level Hydrographs
Cosumnes area with little info

18. Selected Groundwater Level Hydrographs
Turlock data mapped from local updates, good representation.
Modesto has not been yet and the calibration is not as good yet

19. Selected Groundwater Level Hydrographs
Merced is generally good, we had good local data shared with us
Madera in general good.
In the middle around Chowchilla area, the simulated values are higher and we could not be able to verify sw supply data before 1990s

20. Selected Groundwater Level Hydrographs
North gw levels are high compared to simulated
Other areas are mix
K for Corcoran Clay needs to be refined
Demand data needs to be updated
Impacting neighbor subregions

21. Groundwater Budget – Sacramento River Hydrologic Region
Replace this with the budget for Sacramento Valley (Subregions 1-7)

22. Groundwater Budget – San Joaquin River Hydrologic Region
Replace this with the budget for Sacramento Valley (Subregions 1-7)

23. Next Steps Supply-Demand Corrections as Necessary
Refinement of Hydraulic Conductivity for Corcoran Clay
Evaluation of Streamflows & Stream Aquifer Interactions
Evaluation of Subsidence
Development of Guidelines for Automated Calibration
Automated Calibration
Documentation

24. Questions ?