To calculate the number of cubic feet of water per gallon, divide the number of cubic feet by 7.48. One gallon of water is 0.137 cubic feet. Check out Sam Houston State?s hydrology lab at http://www.shsu.edu/~geo_mrl/HydLab1.html. Find other useful conversion tools at http://www.onlineconversion.com. The weight of a cubic foot of water depends on what solubles the water contains such as salt.
