Hydraulics & Waterways


396873 - Modeling Interconnected Reservoirs with HEC-ResSim

Wednesday, June 6
2:00 PM - 3:30 PM
Location: Greenway CD
Co-Authors: Joan Klipsch, Hydrologic Engineering Center (HEC) 609 Second Street Davis, CA 95616-4687 – U.S. Army Corps of Engineers

The USACE Hydrologic Engineering Center (HEC) reservoir simulation software, HEC-ResSim, is being used by reservoir modelers world-wide. HEC-ResSim can be used to simulate reservoir operations for multiple objectives including flood risk reduction, navigation, hydropower, and environmental support. ResSim uses a map-based schematic to represent the river and reservoir system. Reservoir operation is modeled through a set of operation rules that describe the operating goals and constraints.

The Tioga-Hammond reservoir system, located in the Chemung River watershed at the headwaters of Susquehanna River basin, contains two parallel reservoirs, Tioga and Hammond, whose pools are joined by a connecting channel. The connecting channel contains a control structure with two gates and an overflow weir. Under normal operations, Hammond’s pool is kept 5 feet higher than Tioga’s and Hammond’s excess inflows are released into Tioga by utilizing the gates in the connecting channel. During flood operations, the pools may rise and the 5’ elevation difference may not be maintained. Under extreme events, one or both pools may exceed the elevation of the connecting channel’s weir resulting in an uncontrolled exchange of flow between reservoirs. HEC-ResSim was designed to represent only dendritic river systems so modeling the bi-directional flow of the Tioga-Hammond connecting channel posed a significant challenge.

The solution involved the use of some special modeling techniques and the powerful scripting capability within ResSim. This presentation will describe the intricacies of this modeling effort within ResSim including how the network was constructed and how scripting was used to make it work.

Masoud Meshkat, PhD

Associate Engineer

Masoud Meshkat, Ph.D., P.E
Masoud is an associated water resources engineer with Wood. He is a registered professional engineer in Tennessee and Oklahoma. He earned his Ph.D. from University of Kentucky in Biosystems Engineering. For the past 18 years at Wood he has been involved in many H&H studies including: DFIRM, USACE MMC and CWMS program, Dam breach and 2D modeling of riverine systems. He currently serves as engineering coordinator and mentor to water resources engineers. He has been instrumental in the development of many tools in GIS for integration of data into H&H models.


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396873 - Modeling Interconnected Reservoirs with HEC-ResSim

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