It is envisaged that the construction of power waterway system will not be in the critical path of the project. As all the work components can be constructed on the dry area, that it is not limited by the seasonal effects. During the first year of dry season, the construction road branching off from the construction road to the powerhouse to two levels audit portals are foreseen. One audit tunnel will be drilled to the level of penstock to make an access for constructing the penstock tunnel. The other audit tunnel will be drilled to the end of headrace tunnel to make an access for tunneling the headrace tunnel. All the length of headrace tunnel will be drilled from this audit tunnel or one face tunneling to facilitate the drainage of ground water entering the tunnel.