The original data is 11.8 million gallons per year. Converting that into liters, then dividing by 365 * 24, and applying 3 sig figs to that result we get 5100

The original data is 11.8 million gallons per year. Converting that into liters, then dividing by 365 * 24, and applying 3 sig figs to that result we get 5100 liters / hour.