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GIS-BASED CUMULATIVE EFFECTS ASSESSMENT

This report was prepared as part of a research project conducted for the Colorado Department of Transportation (CDOT) over a 2-year period. It describes the development and application of geographic information system (GIS) and remote sensing databases and analysis models for cumulative effects assessment (CEA) resulting from growth associated with transportation infrastructure. A spatial environmental database was collated from various sources for a 53 km by 97 km (33 mi by 60 mi) region bounding I-25 from Denver to near the Colorado-Wyoming border. This report demonstrates several ways that GIS can be used as a tool for performing CEAs. It presents four environmental assessments which use GIS. The first two, a habitat suitability study and a land use change analysis, demonstrate commonly used GIS overlay and distance techniques; the remaining two use less common and more complex technologies. The third study links a spatial database with commonly used flood design procedures to measure hydrologic impacts due to land use change. The final study uses a number of techniques for development growth modeling. Specific applications for CEA are given in the land use and hydrologic studies. Development of these data sets in standardized formats, scales, and projections provides a means for comparison of attributes across the study region or at any given location. Ultimately, the GIS data would be implemented as compatible with the CDOT transportation geodatabase currently under development, thus making a seamless interface for CDOT staff and contractors to access all data for the region in support of planning activities. CDOT may use these data and techniques for transportation planning and developing National Environmental Policy Act documents, or make them available to stakeholders and interested departments of transportation across the nation.