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

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

Simulation Feature Data Set

Boundary Polygon J I

Cell2D and Node2D Features

Conceptual Model - Hydrogeology

Ancestral Streams

Ancestral Streams

Ancestral Streams

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

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

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”

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

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

MODFLOW Data Model

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

Import MODFLOW Model Tool INPUT OUTPUT

Make MODFLOW Features Tool + Cell2D Node2D Or INPUT OUTPUT

Map Layer – Computed Head

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

Discretization of Features

Geoprocessing Tools

Geoprocessing Tools

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

For more information http://www.archydrogw.com (AHGW Wiki page) http://www.aquaveo.com/archydro (Info on tools) Norm Jones njones@aquaveo.com