According to The Water Resources Management Act No. 11 of 2009, the main functions of the RBWB   include but are not limited to:

1. Preparation of Basin WRM plans, projects, budgets and an implementation strategy;
2. Integrate district plans into Basin WRM plans;
3. Monitor, evaluate and approve construction and maintenance of water sources structures;
4. Collect, process and analyze data for WRM;
5. Maintain and update assessments of the availability and potential demand for water resources;
6. Resolve intra basin conflicts   and inter-basin water use conflicts;
7. Prepare reports on the state of water resources in the Basin;
8. Appointment of Catchment Water Officer, Chairman and members of   Catchment and Sub Catchment Committees;
9. Maintain water register, approve, issue, revoke water use and discharge permits; and
10. Coordinate inter-sectoral WRM at basin level and serve as a channel of communication between sectors and water users in general.