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How Do You Keep a Subway from Flooding in the Age of Rising Seas? (2019)

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11–20 of 53 posts

Re: How Do You Keep a Subway from Flooding in the Age of Rising Seas? (2019)

#11

> Sandy had made a mockery of the largest subway system in the world Is the New York subway really the largest subway in the world? I thought that trophy went to subways in Tokyo or Seoul.

It depends how you measure it.

NYC has the most stations, 424.

Shanghai has the most track, 743 km, and the most annual riders, 2834.69m.

Re: How Do You Keep a Subway from Flooding in the Age of Rising Seas? (2019)

#12

> Sandy had made a mockery of the largest subway system in the world Is the New York subway really the largest subway in the world? I thought that trophy went to subways in Tokyo or Seoul.

It depends how you measure it. NYC has the most stations, 424. Shanghai has the most track, 743 km, and the most annual riders, 2834.69m.

If I were to be the one deciding how to measure this, the “biggest” subway would be the one that moves the most people per day.

Re: How Do You Keep a Subway from Flooding in the Age of Rising Seas? (2019)

#13

Newer systems being built in Asia are avoiding subways/underground systems and preferring elevated systems. In fact during a major flood, the elevated railway was pretty much the only servicing transporting system in effect.

Which ones do you have in mind? All new lines in Shanghai are underground and so in a few other Chinese cities.

Re: How Do You Keep a Subway from Flooding in the Age of Rising Seas? (2019)

#14
post #13

Newer systems being built in Asia are avoiding subways/underground systems and preferring elevated systems. In fact during a major flood, the elevated railway was pretty much the only servicing transporting system in effect.

Which ones do you have in mind? All new lines in Shanghai are underground and so in a few other Chinese cities.

Bangcok?

Re: How Do You Keep a Subway from Flooding in the Age of Rising Seas? (2019)

#15

Newer systems being built in Asia are avoiding subways/underground systems and preferring elevated systems. In fact during a major flood, the elevated railway was pretty much the only servicing transporting system in effect.

Because they trade ugly surface volume occupation for being much cheaper. Flood resistance is a side-effect.

Re: How Do You Keep a Subway from Flooding in the Age of Rising Seas? (2019)

#16
The Zhengzhou metro, one which got flooded, has blast doors in, and in between stations like most metros in the Bloc.

The anger now is because despite millions spent on those blast doors, they were simply not activated. The shift chief of the metro was too afraid to stop the metro.

The same for its very powerful flood defence pumps.

Re: How Do You Keep a Subway from Flooding in the Age of Rising Seas? (2019)

#17

Earlier quoted context omitted.

It depends how you measure it. NYC has the most stations, 424. Shanghai has the most track, 743 km, and the most annual riders, 2834.69m.

If I were to be the one deciding how to measure this, the “biggest” subway would be the one that moves the most people per day.

Nah, breadth and depth

Re: How Do You Keep a Subway from Flooding in the Age of Rising Seas? (2019)

#18
post #16

The Zhengzhou metro, one which got flooded, has blast doors in, and in between stations like most metros in the Bloc. The anger now is because despite millions spent on those blast doors, they were simply not activated. The shift chief of the metro was too afraid to stop the metro. The same for its very powerful flood defence pumps.

Reminds me of a documentary on the flood gates at the Port of Rotterdam. They are operated automatically, humans cannot trigger them (if memory serves well). Reasoning was, that operators live nearby and might tend to close them too soon and too often. Now you have to trust the system to have a proper balance between keeping the port open and protecting communities. Up to now the Rotterdam system seems to work reasonably well so.

Re: How Do You Keep a Subway from Flooding in the Age of Rising Seas? (2019)

#19

How will this hold up in 12 years? https://www.nasa.gov/feature/jpl/study-projects-a-surge-in-c...

https://tidesandcurrents.noaa.gov/sltrends/sltrends_station....

110 years of 2.5mm per year. Something tells me the study you're referring to is wrong.

Re: How Do You Keep a Subway from Flooding in the Age of Rising Seas? (2019)

#20

> Sandy had made a mockery of the largest subway system in the world Is the New York subway really the largest subway in the world? I thought that trophy went to subways in Tokyo or Seoul.

It depends how you measure it. NYC has the most stations, 424. Shanghai has the most track, 743 km, and the most annual riders, 2834.69m.

A quick Google says the Tokyo metro moves over 3.3 billion a year.
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