نهر اليرموك
Several plans attempted to allocate the water resources of the region during the British Mandate. The Ionides Plan of 1939 made three recommendations. First, it proposed to store the floodwaters of the Yarmouk River in Lake Tiberias (Sea of Galilea). Second, it set and amount of the water in the lake to be diverted through the East Ghor Canal and used for irrigation east of the Jordan River. Third, it limited the use of Jordan River Basin water to the Jordan River Valley. This was rejected by Zionist advocates who envisioned using waters from the Jordan River Basin to settle the Negev Desert in the south of the country. In contrast, the Lowdermilk Plan, commissioned by the United States Department of Agriculture, proposed irrigating the Jordan River Valley and diverting the Jordan and Yarmouk Rivers for hydroelectric power. In 1948, James B. Hays used the findings in Lowdermilk as a basis for the Hays Plan in which the Yarmouk River was to be diverted into Lake Tiberias to compensate for the waters lost in the diversion of the Jordan River for agricultural purposes.