fiendishrabbit t1_jdunefw wrote
Reply to comment by JohnnyJordaan in ELI5: How is there enough water pressure to delivery water to every home and apartment in a city? by Maxweilla
There are a lot better reasons for a water storage tank on the roof than "to not require huge pumps to meet demand when everyone is taking a shower at the same time".
Pumping into a tank means that the pump does not experience any water hammer effects (which can ruin the pump) and it means that water pressure from the tap is even (since the pressure is determined by the height difference between the water surface and the tap) rather than fluctuating as it would if it was actively pressurized by a pump.
JohnnyJordaan t1_jdupfmm wrote
Those are indeed important advantages but not strict requirements for the system to function, I meant it in that regard.
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