4 ms·
EU mandates storm retention tanks, i.e. a buffer, to minimize this problem. For instance, Madrid has built a massive 400,000 m3 tank and the problem is now sol
by nextos 3y ago
EU mandates storm retention tanks, i.e. a buffer, to minimize this problem.
For instance, Madrid has built a massive 400,000 m3 tank and the problem is now solved. Lots of other main cities are doing / have done the same.
Without those, in the event of heavy rain, there is not only raw sewage but also lots of contaminants from e.g. traffic that leak into rivers and kill everything there periodically.
- teruakohatu 3y agoWow, I looked it up. I guesstimated it would have a cylinder diameter of 160m and depth of 20m and I was pretty close at ~22m x ~190m given (its an irregular polyhedron). Its an underground lake. I guess its a question of scale, I was referring to small rivers that meander through city suburbs and are part of the stormwater network and may have a few overflows on occasion, rather than a city of Madrid which has a population about 60% of my entire country. In New Zealand stormwater to my knowledge is not treated. If anyone else is interested: https://www.canaldeisabelsegunda.es/en/-/tanques-de-tormentas-protectores-de-los-rios https://www.canaldeisabelsegunda.es/en/-/tanques-de-tormenta...
- resolutebat 3y agoTokyo's G-CANS, whose main tank is 25x177x78m, also shows up on HN regularly. https://www.amusingplanet.com/2013/03/g-cans-tokyos-massive-underground-storm.html https://www.amusingplanet.com/2013/03/g-cans-tokyos-massive-...