Ben Chacon joined RMA in 2010 and has focused on development of computational models for HEC. He has helped expand Monte Carlo simulation capabilities for HEC’s Water Analysis Tool (HEC-WAT), HEC-ResSim, and HEC-FIA, adding consideration of correlated sampling, data aggregation and different treatment of epistemic and aleatoric uncertainty. As part of his work on HEC’s River Analysis System (HEC-RAS) projects, Ben designed and implemented a new 2D flow model (RAS2D) that supports solution of the full shallow water equations as well as the simplified diffusion-wave equation over an unstructured computational grid. He has also implemented advanced matrix solvers to improve performance of the RMA2 and RMA11 finite element models. Ben holds a bachelor’s degree in computer science and earned doctorate degrees in mathematics from Pennsylvania State University and in aerospace engineering from the University of California, Davis.