Reservoirs will be of between 200Mm3 and 12.5Bm3 capacity, while their associated dams will be of 40-140m in height. Work on the Cua Dai reservoir, including a 100m high dam, will start in September in Thanh Hoa province. The reservoir will have a capacity of 1.5Mm3, which will irrigate 80,000ha of land.