Convert US gallons per day to Acre-feet per hour
Convert US gallons per day (gpd) to Acre-feet per hour (ac-ft/h) instantly and accurately.
Conversion Formula
ac-ft/h = gpd × 1.278701366e-7
About US gallons per day
The US gallon per day (gpd) equals 3.785411784×10⁻³/86400 ≈ 4.381×10⁻⁸ m³/s, the standard unit in US water-utility regulation and residential water-well pump sizing. The US national average residential water use is about 80-100 gpd per person; a reverse-osmosis membrane module is rated in gpd (50-100 gpd for domestic units). 1 US gpd ≈ 4.381×10⁻⁸ m³/s.
About Acre-feet per hour
The acre-foot per hour (ac-ft/h) equals 1233.48183754752/3600 ≈ 0.34263 m³/s, standard for sizing irrigation district delivery canals, reservoir outflow scheduling, and aquifer recharge basin calculations in the western US. The US Bureau of Reclamation uses ac-ft/h for canal operational planning; a 1 000-acre farm irrigating with 0.5 in/h rain-equivalent receives ≈41 ac-ft/h. 1 ac-ft/h ≈ 0.34263 m³/s.
Quick Reference Table
| US gallons per day (gpd) | Acre-feet per hour (ac-ft/h) |
|---|---|
| 1 gpd | 1.279 × 10-7 ac-ft/h |
| 2 gpd | 2.557 × 10-7 ac-ft/h |
| 5 gpd | 6.394 × 10-7 ac-ft/h |
| 10 gpd | 1.279 × 10-6 ac-ft/h |
| 25 gpd | 3.197 × 10-6 ac-ft/h |
| 50 gpd | 6.394 × 10-6 ac-ft/h |
| 100 gpd | 1.279 × 10-5 ac-ft/h |