The efficient use of fresh water sources and proper modeling of the water quality can only be possible when flows in the dam
reservoir are well defined. Therefore, in this study, a hydrodynamics model of an actual dam reservoir in three dimensions for
simulating a real dam reservoir flows for summer season is created. The model is developed using nonlinear and unsteady
continuity, momentum, energy and k-ε turbulence model equations. In order to include the Coriolis force effect on the flow in a
dam reservoir, Coriolis force parameter is also added the model equations. Those equations are constructed using actual
dimensions, shape, boundary and initial conditions of the dam and reservoir. Temperature profiles and flow visualizations are
used to evaluate flow conditions in the reservoir. The model successfully simulates the formation of density currents and the
thermal characteristics of the reservoir system for seasonal heat exchanges. Model simulations results obtained for summer
season are compared with field measurements obtained from gauging stations founded on the dam reservoir. The results are
found to be in accordance with the actual values measured. This investigation can be also useful for sedimentation studies, water
quality modeling and management, and habitat assessment in a reservoir.