in/h
inch per hour
Speedexact by definition
The inch per hour is exactly 0.0254/3600 metres per second, the American unit of rainfall intensity and of soil infiltration rate. Percolation tests for septic system design are reported in inches per hour, and NOAA rainfall frequency atlases tabulate design intensities in the same unit.
Watch out: One inch per hour is 25.4 mm/h, which is a heavy rain rather than a moderate one. American and metric intensity thresholds differ by a factor of 25 and are easily read across without noticing.
| 1 in/h | 0.0000070555556 m/s |
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