Eli5: If a town in the UK gets flooded by local rivers due to storms, does some of the flood water end up going to sewer, and if so does the sewerage plant cope?

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Title, a bit in depth – would preferably like someone who works at one, thanks in advance

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15 Answers

Anonymous 0 Comments

From what I’ve seen, In some cities, the sewer is huge, it can hold alot of rain water, so when you see water in the street it means its full, and draining as best as it can

Anonymous 0 Comments

From what I’ve seen, In some cities, the sewer is huge, it can hold alot of rain water, so when you see water in the street it means its full, and draining as best as it can

Anonymous 0 Comments

From what I’ve seen, In some cities, the sewer is huge, it can hold alot of rain water, so when you see water in the street it means its full, and draining as best as it can

Anonymous 0 Comments

> does some of the flood water end up going to sewer,

Yes

> and if so does the sewerage plant cope?

No

There are storage tanks and once they overflow Thames water dumps the dirty water in the local river, which is a precious ecological resource. An extremely rare ecosystem in a world wide context.

Thames Water have had since 1989 to get this sorted.

Source: I live in a place where this happens and we are mighty pissed off about it.

Anonymous 0 Comments

I also work at a water company funnily enough but I don’t work in waste water. Overflowing on a clean water site can result in fines from Environmental agency, I presume the same kinda thing could happen with rainwater? I’m not sure

Anonymous 0 Comments

> does some of the flood water end up going to sewer,

Yes

> and if so does the sewerage plant cope?

No

There are storage tanks and once they overflow Thames water dumps the dirty water in the local river, which is a precious ecological resource. An extremely rare ecosystem in a world wide context.

Thames Water have had since 1989 to get this sorted.

Source: I live in a place where this happens and we are mighty pissed off about it.

Anonymous 0 Comments

> does some of the flood water end up going to sewer,

Yes

> and if so does the sewerage plant cope?

No

There are storage tanks and once they overflow Thames water dumps the dirty water in the local river, which is a precious ecological resource. An extremely rare ecosystem in a world wide context.

Thames Water have had since 1989 to get this sorted.

Source: I live in a place where this happens and we are mighty pissed off about it.

Anonymous 0 Comments

I also work at a water company funnily enough but I don’t work in waste water. Overflowing on a clean water site can result in fines from Environmental agency, I presume the same kinda thing could happen with rainwater? I’m not sure

Anonymous 0 Comments

I also work at a water company funnily enough but I don’t work in waste water. Overflowing on a clean water site can result in fines from Environmental agency, I presume the same kinda thing could happen with rainwater? I’m not sure

Anonymous 0 Comments

Most municipalities would have two completely separate sewer systems

* a *storm sewer* system, which collects rainwater from streets and other property. These drain down the catch basin (also called storm drains) grates that you would see along the curb on a street. That water flows pretty much untreated back to waterways like lakes or rivers. More stringent standards will now sometimes require some treatment on the property to settle out silt, sand and solids before the water enters the storm drains.
* a *sanitary sewer* system, which takes grey water (sinks, tubs, floor drains and showers) and black water (toilets) and transports it to a sewage treatment plant. In that plant, it is purified and eventually released into a natural waterway.

Generally, a storm sewer system would carry most of the flood water to where it needs to be disposed of. Some will definitely get into the sanitary sewer system, particularly in bad flooding and that excess could certainly overwhelm a sewage treatment plant. If that is the case, then the plant deals with it by releasing it untreated to the waterway. There is little option in this regard – sewage treatment plants aren’t designed to “stockpile” additional volumes. However, in the case of flooding that water is basically rainwater anyway.