Modflow Simulation on Savannah River GIS For Water Resources Term Project (CE 394) Seyoum Asemenaw

ModFlow Defn:- Modflow is a 3-D finite difference GW flow model that solves the continuity equation (Mod flow 2000). Various mod flow packages:- BCF6 -- Block-Centered Flow Package LPF1 -- Layer-Property Flow Package RIV6 -- River Package DRN6 -- Drain Package WEL6 -- Well Package GHB6 -- General Head Boundary Package RCH6 -- Recharge Package EVT6 -- Evapotranspiration Package CHD6 -- Time-Variant Specified-Head Package HFB6 -- Horizontal Flow Barrier Package SIP5 -- Strongly Implicit Procedure Package

Term Project Goals The major objectives are:- To build a modflow interface geodatabase schema To show the relationships between various feature classes To show a time series analysis using Modpath ModPath:-calculate streamlines and travel times along streamlines within the ModFlow daomain. Data sources: Savannah River Authority USGS website CRWR

Savannah River Site

Building a Modflow Mesh (Fishnet)

Fishnet in Workstation Arc/Info Building Fishnet The fishnet prompts are: - Arc: generate f2 Generate: fishnet Origin Coordinate (x, y): , m Y-Axis coordinate (x,y) : , m Cell Size (width, Height) 91.44,91.44 m Number of Rows, columns: 15,22 Generate: quit Polygon construction Arc: build f2 Generate :quit

Resulting Mesh in ArcMap

Modflow Interface Data Model (Developed by Gil Strassberg)

Modflow Schema in Visio 2000

From Schema to Repository

Applying the Schema to Savannah River Data

ModFlow River Package

ModFlow General Head Boundary

ModFlow Well Package

ModPath Simulation

ModFlow Special thanks to:- Gil Strassberg Dr. David Maidment CRWR crew