A New Approach For Linking Hydrologic Models With GIS

Abstract

A method by which a Geographic Information System can be integrated with a hydrologic model in a seamless manner is presented. The three dimensional finite difference ground-water flow model, MODFLOW, is used as an example to show GIS model integrations using Common Object Interfaces (COi). The model is integrated with the GIS using a set of required steps needed to identify the nature ofMODFLOW's data requirements and computational structure. This allows alternate methods to be developed that can obtain data from a Geographic Information System or from a Graphic User Interface. Results of the integration are analyzed by running the integrated model on a sample data set and problems that were encountered during the integration proceedure are identified. The results of the integration indicate that the use of Common Object Interfaces can be successfully incorporated into legacy FORTRAN coded hydrology programs. Factors which verify this conclusion are considered, and the benefits and problems with this type of integration are discussed. Recommendations for future integration efforts and issues that need to be addressed are explored.