Water Pump

Almost every house has water pump. The water pump pumps water from ground to water tank, which is usually located at high place.
Then the water is distributed to water pipes.
By storing water at water tank, the system has some advantage.
First, the water always stand by and ready to use even if water from the ground is dry.
Second, the pressure of the water is higher than directly from water pump. Some water usage such as shower need this kind of high pressure.