Eli5 where does water go in storm drains?
In: 1
Depending on the area:
Rural areas and most small towns. The water goes down the pipe under the street and joins other pipes with each join the pipe size gets bigger until it get to a outflow near a stream, large lakes or river. They once use to drain into smaller lakes but now do it up stream or down stream or into a swam from the rather then directly into them to reduce the direct pollution of lakes
In cities the water goes through the pipes getting larger with each additional drain junction. But in alot of cities the water will go to a pimping station that pumps the water to speed up the flow and increase capacity. It may also have some sections that skim off some of the trash and oils.
When low flows are present it may be diverted into the septic treatment.
Finally it gets pumped out to a large river, sedimint pond, lake or ocean. When very high flow is present it may divert away from any treatment centers and dump direct to the closest river, lake or ocean
Suburban areas can be a mix of rural and city systems, they may treat the drain water or they may just send it out to the environment.
In extremely flat land they will usually dump it out to the main land fall feature that is a river or stream during mild rain. It may have a run off or swamp planting.
Also for the amount of drain explorers out there the death toll is high. Don’t go in for a fun look. In major systems industry or distant rain may flow into a system or be drawn into a system from weather pressure difference and drown people on a seemingly sunny day. There are some sections where a person is unable to go backwards and leave themselves trapped or forced to continue into a joint septic flow to escape. There is also the risk of gas poisoning from composting material. Don’t go in them.
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