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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
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.
Water Flow Time
Where:
= Time it will take to fill the specified volume (min)
= Volume needed (gal)
= Flow rate from the garden hose (gpm)
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 |
| Pressure (psi) | |||||
|---|---|---|---|---|---|
| 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 | |
Reference: Washington State University
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