MODFLOW DATA MODEL An extension of the Arc

MODFLOW DATA MODEL An extension of the Arc Hydro Groundwater Simulation feature dataset

Simulation Feature Data Set

Boundary Polygon J I

Cell 2 D and Node 2 D Features Cell 2 D Node 2 D

CELL 3 D Features

Ancestral Streams

Ancestral Streams

Ancestral Streams

Riverbank Model Layer 1 § 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 § § 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 Model Layers 6, 7 and 8 § 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 § Consists of rhyolite ash, quartz sand , and ashy clay

Ione Formation Model Layer 10 § Consists of sandstone, silts, and clays

Interface Data Models

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

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 + Or Node 2 D Cell 2 D INPUT OUTPUT

Map Layer – Computed Head

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

Discretization of Features

MODFLOW Array from Polygons

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

Model Domain

Land Use Patterns

Water Unit Demand Factors

Calibration of Urban Demand Factors

GSSHA Results 1 2 3 4 5 6 7

Automated Workflow GSSHA simulations Recharge coeff. for each STLU for each water year Master Land Use Files Water Unit Demand Factors Water Year Calculate Change in Land Use Total Recharge GSSHA Simulation Recharge Coeffs Calculate Recharge Model Total Applied Water and Precip Calculate Water Demand Calculate Total Applied Water Budgeting and Accounting Recharge to MODFLOW Total Flow from Ungaged Watersheds Calculate Demand Summary Distribute Demand Lateral Inflow to MODFLOW

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