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.
How much does a gallon of water weigh? 1 gallon of regular water weighs about 8 1/3 pounds (8.345 pounds) This is about 3.785 kilograms. gallons of lead weighs a lot more than 5 gallons of helium. 5 gallons of water weighs a bit over 40 pounds. 4 people found this useful. Edit.