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)

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

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

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

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

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

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

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

Evapotranspiration Model Updates Temporal Updates: Full time-series (1922-2015) 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.

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

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

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

Evapotranspiration Formation Environmental and METRIC

Evapotranspiration C2VSimFG-BETA and METRIC

State and Local Data California Water Plan Spatial Availability: DAU-County Time Step: Monthly Years Available: 1999-2010* *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

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

Summary of IDC Calibration Calibration Targets Evapotranspiration ET0 data source: Cal-SIMETAW ETc data source: 2014 METRIC Agricultural Supply Requirement Sacramento Valley CalAg Model San Joaquin River CalAg Model Tulare Lake Basin CalSimETAW Consumptive Use Fractions Non-Ponded Crops 60-90% Ponded Crops 45-65% Calibration Parameters Evapotranspiration Hydraulic Conductivity Non-Ponded Ponded Pore Size Distribution Index Target Soil Moisture Ponding Depth Reuse Fractions Return Flow Fractions

Evapotranspiration C2VSimFG-BETA2 and METRIC

Summary of IDC Calibration Calibration Targets Evapotranspiration ET0 data source: Cal-SIMETAW ETc data source: 2014 METRIC Agricultural Supply Requirement Sacramento Valley CalAg Model San Joaquin River CalAg Model Tulare Lake Basin CalSimETAW Consumptive Use Fractions Non-Ponded Crops 60-90% Ponded Crops 45-65% Calibration Parameters Evapotranspiration Hydraulic Conductivity Non-Ponded Ponded Pore Size Distribution Index Target Soil Moisture Ponding Depth Reuse Fractions Return Flow Fractions

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

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