Independent Review of Exelon’s LSRRS Model-Enhancements Efforts

As part of an on-going multi-year, multi-investigator program to better understand the impact of storm events on loads of sediments and nutrients from the Lower Susquehanna River Reservoir System (LSRRS) to the Chesapeake Bay (see background page), Exelon Generation Company, LLC (“Exelon”) has employed a team of engineers and scientists to undertake a two-phase modeling approach that would enhance and complement the existing Phase 6 HSPF Watershed Model (HSPF) as well as the simulation of inputs to the Bay Water Quality and Sediment Transport Model (WQSTM). The modeling approach includes developing both (1) an enhanced one-dimensional HEC-RAS model of Lake Clarke and Lake Aldred, similar in nature to the one developed by the USGS as part of the Lower Susquehanna River Watershed Assessment (LSRWA); and (2) a coupled hydrodynamic, sediment transport, sediment nutrient flux and water quality mass balance model for Conowingo Pond, referred to by its developers as the Conowingo Pond Mass Balance Model (CPMBM). As part of this modeling effort, the Exelon team agreed to work closely with the Chesapeake Bay Program (CBP) Modeling Workgroup and U.S. Army Corps of Engineers modelers throughout the process to ensure that all parties are in agreement on the methods used, and deliverables provided, and implementation of to ensure that the model results will help inform the suite of CBP models (specifically Phase 6 CBP Watershed Model and WQSTM) under development as part of the 2017 Chesapeake Bay Mid Point Assessment.

In addition, Exelon agreed that all modeling efforts and reports will be subject to independent review, including interim review and guidance from an independent modeling evaluation group to be contracted and coordinated by the Chesapeake Research Consortium (CRC) through a process that would be made transparent to interested parties through a publicly accessible web page. This current page serves this purpose by documenting the process, activities, and products of this modeling evaluation and review process, which we refer to as the Independent Review of Exelon’s LSRRS Model-Enhancements Efforts.

The modeling evaluation group comprises four independent reviewers.

Separate pages are provided in tabs for the following elements:

  • The full Scope of Work for this independent review
  • Background and Selected Technical Documents that were submitted to reviewers prior to and during the review process and which are public information.
  • Minutes of all webinars, conference calls, and meetings between the Exelon team, the CRC, and the independent evaluators/reviewers.
  • Interim and Final Reviews written by the reviewers/evaluators. These will come only at selected points of time in the process and will be provided on the web within one week of being published.


The Conowingo Dam modeling independent review panel is charged with providing an unbiased and independent review of the Lower Susquehanna River Reservoir System model in support of the 2017 Chesapeake Bay Total Maximum Daily Load Mid-Point Assessment.

The information contained on this website is draft, preliminary and does not represent the final views of any individual or the review panel. Comments, presentations and views are to be used for discussion purposes within the panel.

A final report and recommendations will be developed at the completion of the model and provided to the Chesapeake Bay Program Modeling Work Group. The group will determine if the system model results are appropriate to help inform the Total Maximum Daily Load Mid-Point Assessment.

By no means does the website represent the views of the Chesapeake Resource Consortium, Maryland or its agencies and departments, the Chesapeake Bay Program or Exelon and their contractors.