Convert Cubic kilometres per year to Cubic metres per second
Convert Cubic kilometres per year (km³/yr) to Cubic metres per second (m³/s) instantly and accurately.
Conversion Formula
m³/s = km³/yr × 31.68808781
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 Cubic metres per second
The cubic metre per second (m³/s) is the SI coherent unit of volumetric flow rate. It is used for large river discharges, turbine inlet flows, and major pipeline capacities. The Amazon River at its mouth averages ≈200 000 m³/s; a large hydroelectric turbine passes 400-800 m³/s; a major municipal water-main carries 5-20 m³/s. 1 m³/s = 1 000 L/s ≈ 15 850 US gal/min = 35.315 ft³/s.
Quick Reference Table
| Cubic kilometres per year (km³/yr) | Cubic metres per second (m³/s) |
|---|---|
| 1 km³/yr | 31.6881 m³/s |
| 2 km³/yr | 63.3762 m³/s |
| 5 km³/yr | 158.44 m³/s |
| 10 km³/yr | 316.881 m³/s |
| 25 km³/yr | 792.202 m³/s |
| 50 km³/yr | 1584.4 m³/s |
| 100 km³/yr | 3168.81 m³/s |