Of course, the main influence on streamflow is precipitation runoff in the watershed. Rainfall causes rivers to rise, and a river can even rise if it only rains very far up in the watershed-remember that water that falls in a watershed will eventually drain by the outflow point.
One US gallon of water weighs 133.526464 ounces. The calculations for that answer are below: 1 gallon = 8.345404 pounds 1 pound = 16 ounces 8.345404 X 16 = 133.526464.
Weight of Water per Gallon. The most widely accepted simple scientific answer to this question is that a gallon of room temperature water weighs 8.33 pounds. Whatâs more, if water is heated from room temperature, 70Â°F to its boiling point of 212Â°F, it will weigh 7.996 pounds, losing .333 pounds. [1]