It should be remembered that the WATER monuments (barays, basins) and the hydraulic network (by canals) through the 40,000-hectare site are part of Angkor’s identity through centuries and constitute essential elements of its authenticity. Its conservation, in the best possible condition, is imperative for safeguarding the Outstanding Universal Value of Angkor (OUV). APSARA National Authority is continuously and through regular efforts, attached to: Continuation of the rehabilitation works of the historic hydraulic system, thus an on-going project such as the repair of certain parts of the Baray’s dykes, another, no less considerable, has been submitted for the opinion of the Ad Hoc Experts, namely the cleaning and re-filling of the ancient canal known as “OROKA”, an important element of the historic route, Permanent fight against floods which can endanger both the integrity of Angkor and the lives of the people who traditionally live there. Finally, it should be noted that to ensure the rehabilitation of the SIEM REAP river (zone 3 of the Zoning Plan) an important part of the Angkorian hydraulic system, operation within the framework of a major road network rehabilitation project to which the Royal Government has allocated 150 million dollars for the development of 38 roads, several ministries and the Province of Siem Reap, n cooperation with the APSARA National Authority, are working to clean it up, enhance its environment and beautify its banks. This large-scale operation involves the transfer, out of Angkor Site, of the population illegally settled along the banks. The reception area for this population is at RUN TA EK, outside the site classified on the World Heritage List.