Convert Cubic kilometres per year to Acre-feet per minute
Convert Cubic kilometres per year (km³/yr) to Acre-feet per minute (ac-ft/min) instantly and accurately.
Conversion Formula
ac-ft/min = km³/yr × 1.541397053
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.
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.
Quick Reference Table
| Cubic kilometres per year (km³/yr) | Acre-feet per minute (ac-ft/min) |
|---|---|
| 1 km³/yr | 1.5414 ac-ft/min |
| 2 km³/yr | 3.08279 ac-ft/min |
| 5 km³/yr | 7.70699 ac-ft/min |
| 10 km³/yr | 15.414 ac-ft/min |
| 25 km³/yr | 38.5349 ac-ft/min |
| 50 km³/yr | 77.0699 ac-ft/min |
| 100 km³/yr | 154.14 ac-ft/min |