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 ModpathModPath:-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 FishnetThe fishnet prompts are: -

Arc: generate f2

Generate: fishnet

Origin Coordinate (x, y): 437005,3681499 m

Y-Axis coordinate (x,y) : 437005,3682990 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