1. C2VSimFG State of the IDC Calibration Dominick Amador Woodard & Curran
Collaborators
Tyler Hatch (DWR), Tariq Kadir (DWR)
Abdul Khan (DWR), Paul Shipman (DWR)
Mesut Cayar (W&C), Ali Taghavi (W&C)

2. Presentation Overview
Brief Overview of IWFM Demand Calculator (IDC)
Updates to the IDC input data since C2VSimFG-BETA release
Land Use
Soil Parameters
Precipitation
Evapotranspiration
Refinement of IDC and recent calibration since C2VSimFG-BETA release
Use of remote sensing datasets
Coordination with local agencies

3. IDC Water Budget Components
(Soil Moisture Storage)
Source: IDC 2015 Theoretical Documentation and User’s Manual, August 2017

4. C2VSimFG IDC Development
State and Local Data
Model Calibration
Comprehensive Demand Estimation
IWFM Demand Calculator
Soil Data
Land Use Data
Base ETc
Remote Sensing

5. C2VSimFG IDC Development
State and Local Data
Model Calibration
Comprehensive Demand Estimation
IWFM Demand Calculator
Soil Data
Land Use Data
Base ETc
Remote Sensing

6. Land Use Data Data Sources DWR County Land Use Surveys
DWR Statewide (LandIQ) Land Use
DWR Quad Map-Based Land Use
DWR Decadal Estimated Land Use
CDFW CVPIA Refuges
USDA NASS CropScape
Kern County Land Use
Tehama Pulp Farm
Local IWFM & IDC Models
Butte, Yuba, Glenn, Colusa, Turlock, Merced

7. Soil Parameters SURGO and STATSGO Elemental Discretization
Soil Hydrologic Group
Input Parameters
Hydraulic Conductivity
Pore Size Distribution Index
Total Porosity
Field Capacity
Wilting Point

8. Precipitation File Updates High-resolution precipitation
PRISM Grid: 4,000 m  800 m

9. Evapotranspiration Model Updates Temporal Updates:
Full time-series ( ) with monthly and annual variability
Spatial Updates (Subregional):
ETO CalSimETAW averaged to each SR
Kc CalSimETAW by land use and SR
Spatial Updates (Small Watersheds):
ETO CalSimETAW averaged to each C2VSimCG Small Watersheds
Kc Mapped to adjacent SR native veg.

10. C2VSimFG IDC Development
State and Local Data
Model Calibration
Comprehensive Demand Estimation
IWFM Demand Calculator
Soil Data
Land Use Data
Base ETc
Remote Sensing

11. Evapotranspiration Data Sources C2VSim-CG-r374g CalSIMETAW
Local Models and Data
Irrigation Training and Research Center (ITRC)
Remote Sensing
Formation Environmental
METRIC

12. Evapotranspiration Remote Sensing Data Sources Benefits Limitations
Formation Environmental (2011/2014)
ITRC METRIC (2014)
Benefits
Spatial estimation of actual-ET independent of land use
Limitations
Limited temporal variability
Agreement between datasets

13. Evapotranspiration Formation Environmental and METRIC

14. Evapotranspiration C2VSimFG-BETA and METRIC

15. State and Local Data California Water Plan Spatial Availability:
DAU-County
Time Step:
Monthly
Years Available: *
*CalSimETAW & CalAg Model data may be intermittent and is dependent on source.
Local Data
Data Types
Consumptive Use
Total Agricultural Supply Requirement
Surface Water Deliveries
Local Operations (pumping, spills, etc.)
Data Sources
Local IWFM Groundwater Models
Ag Water Management Plans
Direct Coordination

16. C2VSimFG IDC Development
State and Local Data
Model Calibration
Comprehensive Demand Estimation
IWFM Demand Calculator
Soil Data
Land Use Data
Base ETc
Remote Sensing

17. Summary of IDC Calibration
Calibration Targets
Evapotranspiration
ET0 data source: Cal-SIMETAW
ETc data source: METRIC
Agricultural Supply Requirement
Sacramento Valley CalAg Model
San Joaquin River CalAg Model
Tulare Lake Basin CalSimETAW
Consumptive Use Fractions
Non-Ponded Crops %
Ponded Crops %
Calibration Parameters
Evapotranspiration
Hydraulic Conductivity
Non-Ponded
Ponded
Pore Size Distribution Index
Target Soil Moisture
Ponding Depth
Reuse Fractions
Return Flow Fractions

18. Evapotranspiration C2VSimFG-BETA2 and METRIC

19. Summary of IDC Calibration
Calibration Targets
Evapotranspiration
ET0 data source: Cal-SIMETAW
ETc data source: METRIC
Agricultural Supply Requirement
Sacramento Valley CalAg Model
San Joaquin River CalAg Model
Tulare Lake Basin CalSimETAW
Consumptive Use Fractions
Non-Ponded Crops %
Ponded Crops %
Calibration Parameters
Evapotranspiration
Hydraulic Conductivity
Non-Ponded
Ponded
Pore Size Distribution Index
Target Soil Moisture
Ponding Depth
Reuse Fractions
Return Flow Fractions

20. C2VSimFG IDC Calibration Agricultural Supply Requirement
Subregion
C2VSimFG
Target
% Difference 1
105,000
0.0% 2
551,000 3
1,452,000
1,447,000
-0.3% 4
885,000 5
1,664,000
1,662,000
-0.1% 6
754,000
755,000
0.1% 7
448,000
450,000
0.4% 8
869,000
870,000 9
1,391,000
1,379,000
-0.9% 10
1,493,000
1,511,000
1.2% 11
855,000
854,000
Subregion
C2VSimFG
Target
% Difference 12
770,000
0.0% 13
1,934,000
1,935,000
0.1% 14
1,069,000
1,071,000
0.2% 15
2,338,000 16
590,000
591,000 17
1,063,000
1,073,000
0.9% 18
2,556,000
2,557,000 19
1,112,000 20
873,000 21
1,212,000

21. Model Calibration
IDC refinement is a FOUNDATION for the C2VSimFG-BETA2 as it is only the first step in a fully calibrated system.
Groundwater Calibration
Additional refinement completed during full-model calibration
Important to understand the limits of other models and parameter estimation
Allowing refinements within reasonable range:
Water Budget Calibration
Groundwater Level Calibration