3 ms·

Reminds me of the Chicago Deep Tunnel project, expected to fully operational around 2029 https://en.wikipedia.org/wiki/Tunnel_and_Reservoir_Plan https://en.wik

• jauntywundrkind 3y ago
  DC just wrapped up our North East Boundary Tunnel project. 23 foot diameter pipe connecting combined runoff system to existing water treatment system. https://www.dcwater.com/projects/northeast-boundary-tunnel-project-0 https://www.dcwater.com/projects/northeast-boundary-tunnel-p... Next up the Potomac River Tunnel in the northwest, a 19 foot 6.5 mile pipe. https://www.dcwater.com/projects/potomac-river-tunnel-project https://www.dcwater.com/projects/potomac-river-tunnel-projec... I forget the exact backstory but the EPA got some kind of judgement I guess in 2005 that we couldn't let the combined sewer run off overflow run into the river. This has been our response to that. Work was underway in NEbut took till 2016 to figure out the whole plan, https://www.dcwater.com/about-dc-water/media/news/dc-agreement-implement-green-infrastructure-control-combined-sewer https://www.dcwater.com/about-dc-water/media/news/dc-agreeme... DC's tunnels are "only" 100ft down. These Chicago tunnels seem much deeper! We also don't seem to have the vast reservoirs Chicago is adding; our tunnels are our storage.