1. C2VSimFG Updates and Early Comparisons with CVHM2
CWEMF Annual Meeting
Tyler Hatch
Senior Engineer, Water Resources
Sustainable Groundwater Management Office

2. Presentation Overview
C2VSimFG Beta 2.0
What’s New?
What’s planned for Version 1.0?
Coordination with USGS CVHM2
C2VSimFG Version 1.0 Schedule

3. Overview 30179 Nodes 32527 Elements 4 Aquifer Layers*
1033 Small Watersheds
21 Subregions
* Plus an aquiclude layer representing the Corcoran Clay

4. What’s New Precipitation May 2018 Beta: developed using PRISM 4k Data
Beta 2.0: developed using PRISM 30s data
Aggregated to each element and small watershed

5. What’s New StreamSpec File
Reformatted to work with latest updates to IWFM 2015
May 2018 Beta format:
Reach ID, Upstream node, Downstream node, Outflow node, Reach Name
Beta 2.0 format:
Reach ID, Number of Nodes in Reach, Connector Node in Downstream Reach, Reach Name

6. What’s New Corrected Inflows Stony Creek Cottonwood Creek Cache Creek
Bear River
Tuolumne River

7. What’s New
Land Use
Added Land Use Data from Local Models (Butte, Colusa, Glenn, Yuba)
Added Field Scale Data from Westlands Water District and San Joaquin County
Redeveloped 2009 data at a 30 meter grid based on refined CDL data.

8. What’s New Evapotranspiration
May 2018 Beta: Monthly pattern of ET by crop and by subregion or single small watershed
Beta 2.0: timeseries of ET by crop and by Subregion or C2VSimCG small watersheds.

9. What’s New Urban Demand May 2018 Beta Beta 2.0: 105 “Urban Areas”
DAU County
Beta 2.0:
114 “Urban Areas”
9 additional areas include updates in the vicinity of Modesto, Turlock, and surrounding area

10. What’s New Surface Water Deliveries
Updated delivery areas to account for reuse and return flows
Reviewed surface water diversions and updated numerous locations

11. What’s Planned for Version 1.0
Subsidence
Review Interbed Properties
Inelastic Storage Coefficient
Interbed Thickness
Preconsolidation Head
Use latest version of IWFM 2015 with subsidence module revisions

12. What’s Planned for Version 1.0
Aquifer Parameter Refinement with PEST
Maintain connection with geology using Texture2Par
Allow variation regionally through Pilot Points
Better understand where we need additional data.

13. C2VSimFG - CVHM2 Comparison
Precipitation
C2VSimFG: PRISM 30s
By element and small watershed
CVHM2: BCM 270m
By grid cell

14. C2VSimFG - CVHM2 Comparison

15. C2VSimFG - CVHM2 Comparison
ET0
C2VSimFG: CalSIMETAW (modified)
By subregion and CG small watershed
Method: Hargreaves-Samani calibrated to Penman-Monteith at CIMIS stations
Further adjustments made based on IDC calibration after converting to ETc
CVHM2: BCM 270m
By grid cell
Method: Priestley-Taylor

16. C2VSimFG - CVHM2 Comparison
Land Use
C2VSimFG
distribution per element
25 land use categories
mosaicked data sources and gap filled using subregion level estimates
CVHM2
single land use per grid cell (majority)
24 land use categories
algorithm to handle urban growth location through time

17. C2VSimFG - CVHM2 Comparison
C2VSimFG LU Code
C2VSimFG Description
ALANDNV
Native vegetation
ALANDRV
Riparian vegetation GR
Grain CO
Cotton SB
Sugar beets CN
corn DB
Dry beans SA
Safflower FL
Field crops AL
Alfalfa PA
Pasture TP
Tomato processing TF
Tomato fresh CU
Cucurbits OG
Onion & garlic PO
Potatoes TR
Truck crops AP
Almonds & Pistachios OR
Orchard CS
Citrus & subtropical VI
Vineyards ID
Idle
ALANDRI_FL
Rice
ALANDRI_NFL
ALANDRI_NDC
ALANDRF_SL
Refuges
ALANDRF_PR
ALANDU
Urban
Land Use
C2VSimFG
distribution per element
25 land use categories
Rice broken into 3 subcategories
Decomp w/o Flooding
Decomp w/ Flooding
No Decomp
Refuges broken into 2 subcategories
Permanent
seasonal

18. C2VSimFG - CVHM2 Comparison
CVHM2_code
CVHM2_description 1
Water 2
Urban 3
Native classes 4
Orchards, groves, and vinyards 5
Pasture/hay 6
Row crops 7
Small grains 8
Idle/fallow 9
Truck, nursery, and berry crops 10
Citrus and subtropical 11
Field crops 12
Vineyards 13
Pasture 14
Grain and hay crops 15
Semi-agriculture 16
Deciduous fruits and nuts 17
Rice 18
Cotton 19
Developed into cropland 20
Cropland and pasture 21 22
Irrigated row and field crops 23
Native classes-phreatophytes 24
Non-irrigated cropland
Land Use
CVHM2
single land use per grid cell (majority)
24 land use categories
algorithm to handle urban growth location through time

19. Schedule Next version with calibration and documentation – Summer 2019
Work planned to continue to improve and enhance the model - Ongoing

20. Questions

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