Closer to your home might be a water tower, which will always be built on high ground. But no matter where your water comes from, simple gravity is used to get it into your drinking glass at home. Water flows through water pipes from the reservoir or tank to your home. Gravity provides water pressure to send water on its way to you. The water pressure must be strong enough to sometimes go uphill to get to your house, and as the water flows in the pipes, friction between the water and the pipe walls reduces the water pressure.
Water pressure is kept up by gradually reducing the diameter of the pipe.
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