Andrew C. Weaver, P.E., M.ASCE, CFM, has worked in the field of Hydrology and Hydraulics for almost 30 years. This includes 14 years in private practice (as both a storm water design and a municipal engineer), and 16 years in the public sector (as both an Assistant County Engineer and as Water Resources Engineer) for Lancaster County, Pennsylvania. While employed by Lancaster County he was in charge of the county storm water management program, administering State and County grants and working closely with staff of the Pa. Department of Environmental Protection to keep the county in compliance with State law. During his years in the public sector Weaver has worked with Franklin and Marshall College, USGS, USACE, the Susquehanna River Basin Commission, Chesapeake Bay Foundation, the Center for Watershed Protection, Lancaster County Clean Water Consortium, and the Lancaster County Conservation District in various initiatives to reduce pollution and flooding originating Lancaster County. Weaver became interested in watershed modeling in 1995 while working on the watershed models required by the Pennsylvania Storm Water Management Act. Weaver later continued this interest after returning to private practice in 2012. In 2016 Weaver began publishing the results of the watershed modeling with a case study in the ASCE Journal of Hydrologic Engineering. He obtained a bachelor’s degree in Civil Engineering from Drexel University and is a member of the Association of State Floodplain Managers.