Power intake in a hydropower scheme is an entry point of water conductor system which carries water to the power house for power generation. It is a very important structure and due care must be given to its design. It should be designed such way that there should not be any flow circulation in front of intake which could lead to formation of air entraining vortices. Each project has a unique design and layout of intake and therefore it is difficult to predict the probability of formation of an air entraining vortex based on the available empirical equations developed by many Researchers in the past. It is therefore necessary to conduct hydraulic model studies for intakes to get confidence even though if it is safe based on available Researcher’s formulas. Recently, a study was conducted for Power intake of Kholongchhu H.E Project, Bhutan on a geometrical similar model having a scale of 1:40.The adequacy of submergence over intake corresponding to minimum draw down level (MDDL) was checked prior to carrying out hydraulic model studies by plotting the point (P) on a graph of Dimensionless submergence versus Froude Number, where various researchers equation were plotted and nothing could be concluded based on the earlier researcher’s guide lines and therefore it was decided to conduct the physical model studies. Model studies shows occasional formation of Type 1 and 2 vortices near the trash rack piers. These vortices are incoherent surface swirl to surface dimple coherent swirl vortices and are non-air-entraining. As the vortices are of non-air-entraining type, there is no need for anti-vortex devices. Study shows normal flow conditions in front of intake and in the reservoir.