1. An extension of the Arc Hydro Groundwater Simulation feature dataset
MODFLOW Data Model
An extension of the Arc Hydro Groundwater Simulation feature dataset

2. MODFLOW Data Model
Data standard for storing MODFLOW models in a GIS database
Importing models built externally
Archiving calibrated models
Building new MODFLOW models inside ArcGIS
Custom scripts for analyzing/modifying models can be developed as geoprocessing tools

3. Simulation Feature Data Set

4. Boundary Polygon J I

5. Cell2D and Node2D Features

6. Conceptual Model - Hydrogeology

7. Ancestral Streams

8. Ancestral Streams

9. Ancestral Streams

10. Riverbank
Model Layer 1
Middle to Late Pleistocene deposits (formerly the Victor Formation)
Hardpan deposits are prevalent in this formation that inhibit vertical infiltration of recharge from applied water and precipitation
Consists of sands, silts, and clays from floodplain and alluvial deposits
Superjacent ancestral stream channels cut across this formation creating lateral channels of gravels and unconsolidated sediments

11. Turlock Lake Laguna Formation
Model Layers 3,4 and 5
Early Pleistocene to late Pliocene deposits (formerly the Fair Oaks Formation)
Characteristic feature: white to grey tuff and tuffaceous silts “white clay”
Predominantly consists of sands, silts, and clays
Superjacent ancestral stream channels cut across this formation, creating lateral channels of gravels and unconsolidated sediments

12. Mehrten Formation Composed of two dominant units:
Model Layers 6,7 and 8
Pliocene deposits formed during an erosional sequence following chain of volcanic eruptions
Significant water bearing unit
Composed of two dominant units:
Black andesitic sands “salt and pepper sand” and blue and brown clays
Hard gray and black tuff-breccias “lava”

13. Valley Springs Formation
Model Layer 9
Middle Miocene deposits formed during sequence of volcanic eruptions
Characteristic features: olive green – greenish gray tone of clays, silts
Consists of rhyolite ash, quartz sand , and ashy clay

14. Ione Formation Consists of sandstone, silts, and clays Model Layer 10
Consists primarily of sandstone and clays deposited during the Eocene epoch, a time when the ancient sea became fresh to brackish.
Generally low in permeability, although secondary fracturing near the outcrops
Consists of sandstone, silts, and clays

15. MODFLOW Data Model

16. MODFLOW Analyst Tools Developed as geoprocessing (GP) tools
Classes of tools
Import
Export
Visualization/Map Layers
Model editing
Building package input
Working with transient input/solutions

17. Import MODFLOW Model Tool
INPUT
OUTPUT

18. Make MODFLOW Features Tool+
Cell2D
Node2D Or
INPUT
OUTPUT

19. Map Layer – Computed Head

20. Discretize: Spatial Temporal Build Package Input
Polygons  K zones (overlay)
Points  K values (interpolate)
Polylines  River cells
Points  Wells
Temporal
Time Series  Stress Periods

21. Discretization of Features

22. Geoprocessing Tools

23. Geoprocessing Tools

24. Geoprocessing Tools - Workflows
GP tools enable the development of workflows as models or scripts
Extendable – You can create your own workflows
Leverage low-level tools to create new tools

25. For more information
(AHGW Wiki page)
(Info on tools)
Norm Jones