The rate of flow of water from a garden hose depends on the diameter of the hose, length of the hose and pounds per square inch (psi) of pressure when the water is on. Additionally, hose heads and sprayers that adjust the amount of output can also be purchased.
For example, a 1/2 inch hose that is 100 feet long and has a pressure of 40 psi has a water flow of about 6 gallons per minute. Some hose manufacturers create hoses out of special materials or with special nozzles that increase the flow rate of water and can achieve a flow rate of as many as 4 1/2 gallons of water per minute.
