Convert Cubic feet per second to Cubic kilometres per year
Convert Cubic feet per second (ft³/s) to Cubic kilometres per year (km³/yr) instantly and accurately.
Conversion Formula
km³/yr = ft³/s × 0.000893611718
About Cubic feet per second
The cubic foot per second (ft³/s or cfs) equals 0.028316846592 m³/s, the primary unit for measuring river discharge and open-channel flow in the United States. The US Geological Survey publishes all streamflow data in cfs; irrigation water rights, flood-control gates, and dam spillway capacities are specified in cfs. The Colorado River at full natural flow is ≈22 000 cfs. 1 cfs = 0.028316846592 m³/s ≈ 28.317 L/s ≈ 448.8 US gpm.
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
| Cubic feet per second (ft³/s) | Cubic kilometres per year (km³/yr) |
|---|---|
| 1 ft³/s | 0.000893612 km³/yr |
| 2 ft³/s | 0.00178722 km³/yr |
| 5 ft³/s | 0.00446806 km³/yr |
| 10 ft³/s | 0.00893612 km³/yr |
| 25 ft³/s | 0.0223403 km³/yr |
| 50 ft³/s | 0.0446806 km³/yr |
| 100 ft³/s | 0.0893612 km³/yr |