How Many Gallons Per Hour Can a Garden Hose Spray?

Flow Rates and Garden Hose Sizes

The size of a garden hose determines the flow rate, which is the amount of water that passes through it. Standard sizes are 3/8 inch, 1/2 inch, 5/8 inch, and 3/4 inch diameters. Each size has a different flow rate associated with it, with 3/8 inch hoses generally boasting the highest volumes. The maximum flow rate for a garden hose is determined by the inside diameter of the hose, measured in inches. The larger the diameter, the more water that can be transported.

Pressure Effects

In addition to size, the pressure of the water coming out of the faucet also affects the flow rate. Generally, water pressure between 40 and 100 pounds per square inch (PSI) is suitable for most garden hoses. The pressure acts as a force to push water through the hose. The faster the pressure, the more water is pushed through the hose in a shorter amount of time. Increasing water pressure can result in higher flow rates.

Calculating Water Pressure

Flow rate is measured in gallons per minute (GPM) or gallons per hour (GPH). GPM is calculated by multiplying the hose's diameter by the pressure of the water in PSI. To convert GPM to GPH, the formula is GPM multiplied by 60. If the pressure of the water is unknown, you can use the Water Flow Rate Calculator to estimate the pressure of the water.

Garden Hose Maintenance

The most common cause of low flow rate in a garden hose is kinks. Not only does this reduce water pressure but it can also introduce air into the hose. Air in the hose reduces the output of the stream and increases the back pressure, reducing the flow rate. To prevent this, check your hoses periodically for kinks and store them in a location that won't expose them to extreme microclimates or temperatures.

Changing Attachments

The size and shape of the attachments on the end of the hose, such as nozzles, sprinklers, and wands, can also reduce flow rate. These attachments can greatly reduce the diameter of the hose, reducing the amount of water that can pass through. To increase the flow rate, consider using a higher quality attachment or switch to a nozzle that doesn't reduce the size of the hose.

Nozzles

The type of nozzle you use will also affect the flow rate of your hose. Some nozzles are more efficient than others and can deliver higher volumes of water. For a higher rate of flow, consider a nozzle with adjustable flow rates. These allow you to adjust the amount of water coming out of the hose depending on the task at hand.

Insights

Knowing the size of your garden hose and the pressure of the water coming out of the faucet can help you calculate the flow rate of your garden hose. Also, periodically check your hose for kinks or other obstructions, as these can reduce the flow rate. Finally, the type of attachments you use, such as nozzles or sprinkler attachments, can also reduce the flow rate. If you need a higher water flow rate, consider switching to a nozzle that doesn't reduce the size of the hose, or switching to a higher quality attachment.