The proposed flow of 250,000 gallons/second represents a lot of water. Converting it into a more normal engineering unit, this would represent about 32,000 cubic feet/second (CFS). That happens to be about the same rate of flow as passes through the generating turbines at Hoover Dam at full capacity. In the original letter, this flow was correctly calculated as the amount of flow necessary to fill Lake Powell in one year. Even at today’s record low level, Lake Powell is not empty. Lesser flows could reduce the costs and difficulty of the project while still providing significant benefits.