Pumps don't have wattage but the motors that drive them do. motors are rated in amps and volts. if you multiply amps times volts you get watts. Gallons per hour are listed on pumps or can be measured by running the pump for a calculated time and measuring the gallons. Run the pump 1 min and measure the water and multiply by 60 and you have gallons per hour.
A kilowatt/hour is the equivalent of using 1000 watts for one hour, 100 watts for 10 hours, or even one watt for 1000 hours. Any combination of watts times hours that equals 1000, is one kilowatt/hour's worth of power used. (Wiki)
calculate the following time it takes to pump 40 gallons of gasoline
About 171.6 gallons per hour.
Pump efficiency can not be taken as given.
heart pumps around 74 gallons in one hour and about 1800 gallons in a 24 hour period.
The amount of amperage needed for a 220V well will depend on the wattage of the well pump. To calculate the amperage, divide the wattage of the pump by the voltage (220V) to get the amperage required.
i would use a pump that pushes at least 350 gallons an hour
To calculate the amperage of a motor more information needs to be stated. The voltage, wattage or horsepower are needed and then use this equation I = W/E. Amps = Watts/Volts. For calculation purposes there are 746 watts in one Horsepower.
The amperage a 220 volt well pump will pull depends on the wattage of the pump. You can calculate it by dividing the wattage by the voltage (220V) to get the amperage. For example, a 1 HP well pump typically pulls around 8-10 amps at 220 volts.
To determine the size of the pump you need for your pool, calculate the volume of your pool in gallons and choose a pump that can circulate the entire volume in 8 hours.
1 inch every 20 minutes is 3 inches every hour. 3 inches * 1600 ft squared = 400 cubic feet of water per hour. 400 cubic feet * 7.480519481 = approximately 2992 gallons per hour. 2992 gallons per hour / 60 minutes per hour is approximately 60 gallons per minuted (49.8666 gallons per minute). You should probably get a pump that can handle a little more than that, just to take care of the surges.
3 to 6 gallons
The recommended well pump wattage for efficient water supply in a residential setting is typically between 1,000 to 2,000 watts.