5 ms·
Rivers (e.g. Mississipi) work with much smaller gradient of just 0.01% [1], while with your assumption it would be 0.25%, so 25x. Maybe instead it needs to pas
by nuccy 9mo ago
Rivers (e.g. Mississipi) work with much smaller gradient of just 0.01% [1], while with your assumption it would be 0.25%, so 25x.
Maybe instead it needs to pass under the rivers [2: cross-section] surrounding New-York, which may be much deeper, especially when it comes closer to the bay passing Queens and Brooklyn [2: map]
1. https://en.wikipedia.org/wiki/Mississippi_River https://en.wikipedia.org/wiki/Mississippi_River
2. https://gordonsurbanmorphology.wordpress.com/2014/10/26/waterworks-manhattan/ https://gordonsurbanmorphology.wordpress.com/2014/10/26/wate...
- woodruffw 9mo agoThis piqued my interest, so I checked: Tunnel #3 passes under the Harlem River and then the East River, but the Harlem River is less than 30 feet deep for the most part and the East River is around 40 feet deep at the most. (The Army Corps of Engineers has great detailed depth surveys for most of NY's waterways[1].) Edit: There's also a higher-resolution render of the tunnel layout here[2]. [1]: https://www.nan.usace.army.mil/Missions/Navigation/Controlling-Depth-Reports/ https://www.nan.usace.army.mil/Missions/Navigation/Controlli... [2]: https://extapps.dec.ny.gov/docs/water_pdf/nycsystem.pdf https://extapps.dec.ny.gov/docs/water_pdf/nycsystem.pdf