With colleagues, eDD President Dr. Franco Montalto, P.E., recently published a book that can help stormwater engineers to evaluate the impact of various Low Impact Development (LID) technologies, including Green Infrastructure. The book, entitled Computational Methods in Low Impact Development Stormwater Control Measures, can be previewed and purchased here. LID has become the preferred strategy for controlling stormwater. The book describes all the different LID controls in common use today, and the mathematical equations that are used to describe their hydrologic and hydraulic functionality. The second half of the book describes how LID controls are simulated in different computer modeling software packages. The book ends with strategies for advancing the state of the art.