litres per minute to stere/minute WebLow-flow emitters are often used in vegetable gardens, with flow rates varying between 1 and 4 gallons per hour. Conversion Gallon per hour (US) to Gallon per minute (US) A gallon per hour (us gallon, gal/h) is unit of volume flow rate equal to a gallon flow per hour. This tool converts gallons per hour to gallons per minute (gal/h to gal/m) and vice versa. 1 gallon per hour (US) 0.01667 gallons per minute. //