Convert Cubic kilometres per year to US gallons per day
Convert Cubic kilometres per year (km³/yr) to US gallons per day (gpd) instantly and accurately.
Conversion Formula
gpd = km³/yr × 723263661.5
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 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.
Quick Reference Table
| Cubic kilometres per year (km³/yr) | US gallons per day (gpd) |
|---|---|
| 1 km³/yr | 723264000 gpd |
| 2 km³/yr | 1.447 × 109 gpd |
| 5 km³/yr | 3.616 × 109 gpd |
| 10 km³/yr | 7.233 × 109 gpd |
| 25 km³/yr | 1.808 × 1010 gpd |
| 50 km³/yr | 3.616 × 1010 gpd |
| 100 km³/yr | 7.233 × 1010 gpd |