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Garden Hose Flow Rate and Time
The amount of water flow from a garden hose and minutes to supply that amount of water are determined below, based on the hose size and its supply pressure.
Garden Hose Flow Rate Calculator
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The Equations
These calculators use these formulas to determine the water flow rate and time to fill a container with a garden hose.
Water Flow Rate
Where:
= Water flow rate from the end of the hose (gpm)
= An arbitrary number derived from the hose size and supply pressure See Table.
= An arbitrary number to account for hose size See Table.
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Water Flow Time
Where:
= Time it will take to fill the specified volume (min)
= Volume needed (gal)
= Flow rate from the garden hose (gpm)
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To determine the value for , use this table.To determine the value for , use this table.
| Length (ft) | Value |
|---|---|
| 25 | 4 |
| 50 | 2 |
| 75 | 1.5 |
| 100 | 1 |
| 125 | .87 |
| 150 | .75 |
| 175 | .62 |
| 200 | .5 |
| Â | Â | Pressure (psi) | |||
|---|---|---|---|---|---|
| Â | Â | 40 | 45 | 50 | 60 |
| Size (in) | 1/2 | 6 | 6.5 | 7 | 7.5 |
| 5/8 | 11 | 12 | 12.5 | 14 | |
| 3/4 | 18 | 19 | 20 | 22 | |
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Reference: Washington State University
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