PAUL A. DeBARRY, PE, PH, APSS, is a senior engineer and head of the Storm Water Management and River/Stream Hydraulics and GIS Section of the engineering firm of Borton-Lawson, based in Wilkes-Barre, Pennsylvania, and is an instructor at the Pennsylvania State University. He has chaired and co-chaired numerous symposia and conferences related to water resources and GIS, and he is a contributing author to the Hydrology Handbook and GIS Modules and Distributed Models of the Watershed. He is a member of ASCE, where he serves on the Surface Water Hydrology Committee and the review committee for the Journal of Hydrology.