A 50-foot hose with a 7/16-inch diameter holds about 3.25 pounds of water. Increasing the diameter of the hose to 1/2-inch or 5/8-inch adds 73 to 104 percent more water capacity, respectively.

The three common sizes of garden hose are 1/2-, 5/8-, and 3/4-inch, referencing the inside diameter (ID) of the hose. The outside diameter (OD) is typically 1/8-inch larger than the ID ...