The Procedures for Water Use Monitoring (PWUM) support effective monitoring systems for the use of water resources that might impact the Mekong s mainstream. Under the PWUM scheme, any use of water resources within the Mekong River Basin (intra-basin use) and between the Mekong and another basin (inter-basin diversion) with potential significant impacts must be monitored. Objective of the procedure are: To provide a comprehensive and adaptive framework and process to support effective implementation of the intra-basin water use monitoring and the monitoring of inter-basin diversions; To promote better understanding and cooperation among the member States through transparency and confidence in the water use monitoring system.