Convert Acre-feet per minute to Cubic kilometres per year
Convert Acre-feet per minute (ac-ft/min) to Cubic kilometres per year (km³/yr) instantly and accurately.
Conversion Formula
km³/yr = ac-ft/min × 0.6487621073
About Acre-feet per minute
The acre-foot per minute (ac-ft/min) equals 1233.48183754752/60 ≈ 20.558 m³/s, encountered in large irrigation canal capacity descriptions and reservoir emergency spillway sizing in the US West. A major canal gate releasing 1 ac-ft/min drains a 1-acre field 1 foot deep every minute - a substantial agricultural flow. 1 ac-ft/min ≈ 20.558 m³/s ≈ 726.0 ft³/s.
About Cubic kilometres per year
The cubic kilometre per year (km³/yr) equals 10⁹/(365.25×86400) ≈ 31.688 m³/s, the unit used in global hydrology, glaciology, and climate science for river basin runoff, ice-sheet mass balance, and groundwater storage change. Total global freshwater river runoff is ≈37 000 km³/yr; the Amazon alone contributes ≈6 600 km³/yr; the Greenland ice sheet loses ≈280 km³/yr to melt and calving. 1 km³/yr ≈ 31.69 m³/s.
Quick Reference Table
| Acre-feet per minute (ac-ft/min) | Cubic kilometres per year (km³/yr) |
|---|---|
| 1 ac-ft/min | 0.648762 km³/yr |
| 2 ac-ft/min | 1.29752 km³/yr |
| 5 ac-ft/min | 3.24381 km³/yr |
| 10 ac-ft/min | 6.48762 km³/yr |
| 25 ac-ft/min | 16.2191 km³/yr |
| 50 ac-ft/min | 32.4381 km³/yr |
| 100 ac-ft/min | 64.8762 km³/yr |