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 Imperial  Gallon of Water  1 gallon [UK] = 1.201 gallon [US, liquid]  One US gallon weighs 8.34 pounds, so an imperial gallon weighs  about 16.6 percent more, or â¦ almost exactly 10 pounds. . 21 people found this useful. The question and answer are locked and cannot be edited.