As an IDIQ contractor to the US Army Corps of Engineers Hydrologic Engineering Center (HEC), we have been working closely with HEC staff as we apply the new HEC-RAS version 5  combined 1D/2D hydraulic model on case studies and real-world problems for other agencies. We attended both the pre-release HEC-RAS 2D courses/workshops conducted by HEC and have taught HEC-RAS 2D courses for other agencies.

Tom Molls, PhD, PE, D.WRE, principal engineer, prepared a presentation for the 2015 Floodplain Management Association (FMA) Annual Conference on HEC-RAS 2D application. His presentation focused on modeling of a hydraulic jump and 180-degree bend, which are complex modeling problems. Dr. Molls used experimental data to verify results from HEC-RAS 2D.

Dr. Molls also presented at the 2016 FMA conference on HEC-RAS 2D verification. The presentation summarized four test cases: flood wave propagation over a flat surface, surface runoff in a 2D geometry, channel with a sudden expansion creating an eddy zone, and subcritical flow in a converging channel.

The presentation slides and an accompanying paper are below.


Molls, Thomas and Chaudhry, M. Hanif (1995). “Depth-Averaged Open-Channel Flow Model”. Journal of Hydrologic Engineering. June. p. 453.