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Numerical modeling is already used to enhance physical models in conceptualization by narrowing the scope of modelling. Långströmmen shows a way where CFD can be used to project parameters beyond the scope of the initial physical model. Acknowledgements The study of the dam upgrades reported in this paper is performed for power producers Fortum and Uniper, in Sweden. Vattenfall R&D, are acknowledged for their contributions to the hydraulic model tests. The opinions expressed are only those of the authors and do not necessarily represent those of any other individuals or institutions. References [1] YANG, J & ANDREASSON, P. Headward erosion in embankment dams caused by spillway flood discharge. International Journal Hydropower & Dams, 2012, issue 6. [2] YANG, J & ANDREASSON, P. Headward erosion in embankment dams caused by spillway flood discharge. International Journal Hydropower & Dams, 2012, issue 6. [3] YANG, J, ANDREASSON, P & CEDERSTRÖM, M, ”Experiences from modifications of curved spillway channels in dam rebuilding projects”, International Symposium on Hydraulic Physical Modeling & Field Investigation, September 2010, Nanjing. [4] YANG, J, ASCILA, R & NILSSON, C O. Adding extra spillway discharge capacity, a few dam refurbishment examples in Sweden. International ICOLD Symposium on Dams in a Global Environmental Challenges, June 2014, Bali, Indonesia. [5] YANG, J, BILLSTEIN, M & HELGESSON, A. Långströmmen dam safety, hydraulic model study 2014. Vattenfall, R&D Laboratories, Report U 14:56, Feb. 2015, Älvkarleby. [6] YGLAND, D et al. Långströmmen dam safety, a pre-study (in Swedish). Sweco Infrastructure, Project Report 2157149, Sept. 2012, Stockholm. [7] PERSSON J et al. Pre-study Ramsele – waterways downstream of spillways. Norconsult, 2015-05-12. [8] BOND, H et al. Ramsele power plant – Dam Safety Evaluation 2014. WSP, 2015- 02-25. [9] WELDE, A. CFD simulations – New spillway at Långströmmen, 2015-12-15 [10] BILLSTEIN M et al. Ramsele hydraulic model tests. Vattenfall R&D, 2016-10-05 1073