This book is the documented result of a workshop, Modeling and Management of Emerging Environmental Issues, held at Penn State University. This event assembled modeling experts from the U.S. and Canada to discuss modeling technology development and application, in order to promote sound and cost-effective environmental decision-making. This thorough analysis provides environmental engineers, hydrologists, and others with an overview on the state of the art in current practice and identifies emerging research and development trends within modeling technology. Each of the discussions considers not only technical issues, but regulatory and cost factors as well.