The water allocation plan (WAP) for the Mara River Catchment in Tanzania addresses threats to water security in the catchment by providing guidance about how available water should be distributed to individual users through the issuance of water permits. When available water is insufficient to meet demand, the WAP prioritizes allocations to ensure sustainable development of the river basin. The plan contains multiple options for allocating water depending on water availability and current, medium- and long-term demand.