Foot per Day (ft/day)
Feet per day are the US unit of hydraulic conductivity in USGS reports and groundwater models such as MODFLOW run in US units.
Symbol: ft/day
Quantity: hydraulic conductivity (coefficient of permeability k)
SI relation: 1 ft/day = 0.000003527777777778 m/s (exact)
Derivation: 1 ft/day = 0.3048/86,400 m/s.
Exact: yes, by definition
Typical uses
- USGS aquifer reports
- US groundwater modelling
- Well-field design in the US
Convert feet per day to other units
| Conversion | 1 ft/day equals | Reverse |
|---|---|---|
| foot per day to metre per second | 0.000003527777778 m/s | metre per second to foot per day |
| foot per day to centimetre per second | 0.0003527777778 cm/s | centimetre per second to foot per day |
| foot per day to metre per day | 0.3048 m/day | metre per day to foot per day |
| foot per day to centimetre per hour | 1.27 cm/h | centimetre per hour to foot per day |
| foot per day to millimetre per hour | 12.7 mm/h | millimetre per hour to foot per day |
| foot per day to inch per hour | 0.5 in/h | inch per hour to foot per day |
| foot per day to gpd/ft² | 7.480519481 gpd/ft² | gpd/ft² to foot per day |
Open the Hydraulic Conductivity Converter (cm/s, m/day) to convert any value between all units.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "foot".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Foot per Day (ft/day). Retrieved October 29, 2026, from https://scientificconverters.com/units/foot-per-day/
IEEE
Scientific Converters, "Foot per Day (ft/day)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/units/foot-per-day/