It must be kept in mind that the WESTERN BARAY, while being a major water reservoir, one that is vital for economic growth in the Siem Reap region, is a foremost historical monument, a very unique record of Khmer heritage. The showcasing of its historical and archaeological features and rehabilitation of its hydraulic function necessitates compliance with the parameters resulting from recent studies that show that the maximum depth of water must be kept to 19.9 m after consolidation of the perimeter banks when the historical dikes are restored. This height will make it possible to keep above water the Mebon Angkorian monument in the center while achieving a storage capacity of 62 million m3 of water.