R-- Sediment transport features in HEC-RAS.

This contract, solicitation number W91238-14-Q-0056, was issued by the Department of Defense through the US Army Corps of Engineers, Sacramento District, and the Hydrologic Engineering Center. The project focuses on enhancing sediment transport and bank stability features within the HEC-RAS software to better support alternative sediment management studies, such as reservoir flushing and sluicing. A primary technical objective is the improvement of Rules computations to include a Stage operational parameter that maintains a target stage at upstream cross sections, mirroring the capabilities of specific boundary conditions to compute necessary flow and gate openings. The scope of work further includes the development of a veneer-method dredging feature, the implementation of grain-class-specific advection-dispersion coefficients, and the integration of RipRoot to account for root effects in bank stability. Additionally, the contractor is responsible for technology transfer through the creation and presentation of lectures and workshops. Due to the specialized nature of the HEC-RAS source code, this action was executed as a single-source procurement under FAR 6.302-1 and FAR 13.106-1(b)(1), identifying Steven Piper as the only responsible source with the unique capabilities required to complete the tasks without incurring unacceptable delays or costs.