We would like to acknowledge that the professionalism, efficiency and commitment that we received from Narvan Arra have been essential factors for successful on-going implementation of optimum management and operation of water resources systems, hydropower and hydro thermal plants on two great and historical river systems of Iran, Karun and Dez, for KWPA. The project has received the highest award from the British Consultants and Contractors Bureau (BCCB) in relation to the comprehensive scope of the study.