How Many GPM Does a Garden Hose Deliver?

The gallons per minute (GPM) that a garden hose delivers can vary depending on the hose size, water pressure, and length. However, most standard garden hoses will deliver anywhere from 9 to 17 GPM under typical household water pressure.

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Here’s a breakdown of the factors that affect how much water flows through your garden hose:


1. Hose Diameter

The diameter of the garden hose plays a key role in determining the water flow rate:

  • 5/8-inch Hose (most common): This hose typically delivers about 13 to 15 GPM at standard household water pressure (usually around 40-60 PSI).
  • 1/2-inch Hose: A smaller diameter hose delivers less water, generally around 9 to 10 GPM.
  • 3/4-inch Hose: A larger hose can deliver more water, approximately 15 to 17 GPM.

2. Water Pressure (PSI)

Water pressure, measured in pounds per square inch (PSI), significantly impacts GPM. The typical household water pressure is around 40 to 60 PSI.

  • Higher Pressure: If your home has higher water pressure (closer to 60 PSI), you’ll get more GPM.
  • Lower Pressure: Homes with lower water pressure (below 40 PSI) will see reduced GPM.

3. Hose Length

The longer the hose, the more resistance the water will encounter as it travels through it, resulting in a lower GPM.

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  • 50-foot Hose: Delivers more water than a longer hose.
  • 100-foot Hose: Typically delivers slightly less GPM compared to a shorter hose due to increased friction, with a reduction of about 1-2 GPM.

4. Type of Nozzle or Attachments

If you use a nozzle, sprinkler, or other attachments, these can restrict water flow, reducing the overall GPM coming out of the hose.


Typical GPM for Common Hose Sizes:

Hose Diameter GPM (at 40-60 PSI)
1/2 inch 9 – 10 GPM
5/8 inch 13 – 15 GPM
3/4 inch 15 – 17 GPM

How to Measure Your Garden Hose’s GPM

  1. Grab a 5-gallon bucket.
  2. Turn on the water and time how long it takes to fill the bucket.
  3. Calculate the GPM: If it takes 30 seconds to fill a 5-gallon bucket, the flow rate is 10 GPM (5 gallons ÷ 0.5 minutes = 10 GPM).

Conclusion

A standard 5/8-inch garden hose typically delivers 13 to 15 GPM, while a 1/2-inch hose delivers about 9 to 10 GPM. The exact GPM depends on your water pressure, hose length, and diameter. If you need higher water flow, consider using a 3/4-inch hose or increasing your water pressure.

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