Fluid flow and temperature fields in the two-dimensional vertical plane of a reservoir are numerically modeled for inflow Reynolds number R0in the range 100-1000 and inflow densimetric Froude number F0in the range 0.5-50,0. Both surface inflow and submerged inflow were studied for reservoir slopes of 45° and 90°. Numerical experiments show that the flow fields and temperature distributions in the reservoir are primarily a function of F0, while the dependence on R0is implicitly coupled to F0. The strengths and extent of recirculation of the flow fields in the reservoirs were observed to be characterized by functions that are directly proportional to l/F20and R0.