How Many GPM Is a Garden Hose?

Garden hoses, also known as water hoses, are essential tools in the garden. They provide a steady flow of water to plants, allowing them to stay healthy and hydrated. But how much water comes out of a garden hose in a given amount of time? Specifically, how many gallons per minute (GPM) is a garden hose's maximum flow rate?

Hose Flow Rates

The flow rate of a garden hose depends on its diameter, as well as its length and any type of nozzle attached to it. Generally speaking, the smaller the diameter, the lower the water capacity. The most common garden hose diameters are 1/2 inch, 5/8 inch, and 3/4 inch. A 1/2 inch hose, for example, flows at a rate of 4 GPM, and a 3/4 inch hose flows at about 23 GPM.

Hose Length

The length of the hose also affects the rate of water flow. Longer hoses can mean lower flow rates due to the pressure loss that occurs along the length of the hose. Short hoses are typically more efficient in terms of flow rate. For example, a 50-foot long hose with a 1/2 inch diameter can have a flow rate of less than 5 GPM, while a short hose with the same diameter can have a flow rate of up to 8 GPM.

Hose Pressure

The pressure coming from the tap will also have an effect on the flow rate. Normally, the more pressure, the higher the flow rate. If the pressure is too low, the flow rate will be significantly lower than expected. For example, a hose with a 1/2 inch diameter and a short length may flow at 8 GPM with a high pressure tap, but only 3 GPM with a low pressure tap.

Nozzle Pressure Loss

The nozzle attached to the garden hose can also have an effect on the flow rate. If the nozzle is narrow, it can cause a significant pressure loss. This means that the water pressure coming out of the nozzle will be much lower than that coming from the tap. As a result, the flow rate will be lower.

Garden Hose Flow Rate Chart

To help you figure out the flow rate of your garden hose, here is a chart showing the typical flow rate of garden hoses with different diameters (according to the length):

Conclusion

Figuring out the flow rate of your garden hose will depend on a number of factors including its diameter, length, the pressure of the tap, and any nozzle that is attached to it. A shorter hose with a large diameter will generally flow faster than a longer hose with a smaller diameter. Be sure to use the chart above as reference when selecting a hose or nozzle.

In Summary

The flow rate of a garden hose depends on its diameter, length, the pressure of the tap, and any nozzle attached to it. The shorter the hose and the larger the diameter, the greater the flow rate. Be sure to use the flow rate chart provided above as a reference when selecting a hose or nozzle to ensure you are getting the best performance for your needs.