system
Given the following post, respond as if you're commenting on Reddit:
human
How does water reach every house in a city in roughly the same conditions? shouldnt a house interrupt the system?

just wondering about this when i was taking a bath. if i open the faucet water comes out at a given pressure, this seems to be the same base pressure on every house and building. but if all that water is running under the city at a base pressure wouldnt a house opening the faucet decrease the pressure of the overall system? how can every house recieve the same water pressure at the same time (7am for example when everyone is getting ready). how are some parts of the system not more pressurised than other by use/un-use.

and how can a valve be closed without increasing the pressure of the system? i know this is wrong because if it was true then water pipes could explode but im having trouble imagining exactly how its handled.
gpt
Pressure is largely static because the discrepancy between the volume of the source versus the volume of the house supply.  1,000,000:1.   When you do see the changes is when there are too many houses (overdevelopment) or is a few users pull water at a higher pressure (extract with a pump) a significant volume.  Example is a fire pumper truck which will drop the pressure in a neighborhood when fighting a fire.