

Edited by jis, 02 April 2018 - 04:43 PM.
Posted 02 April 2018 - 01:09 PM
Edited by jis, 02 April 2018 - 04:43 PM.
Posted 02 April 2018 - 04:26 PM
Edited by Bob Dylan, 02 April 2018 - 04:30 PM.
Posted 02 April 2018 - 04:37 PM
Well, the New York East Side Access Project is a technically remarkable, and remarkably overpriced project. The San Francisco Bay Bridge replacement is a great one too, though not as hard to build as this one.
The Gateway Project if and when it happens will cost way way more than this bridge but won;t be anything as remarkable as it, unfortunately. Hudson is a very pretty but really tiny river.
Posted 05 April 2018 - 02:55 PM
NPR's Marketplace had a program (ok, well, ok, a piece about) about tunneling costs in Nu Yawk. Way higher than anywhere else.
So the bridge is basically between Dhaka and Faridpur, more or less, on the map?
SJ - Norra Stambanan, Nordvästra stambanan, Södra stambanan, Dalabanan
NSB- Bergensbanen, Kongsvingerbanen, Rørosbanen, Dovrebanen, Flåmsbana, Roa–Hønefossbanen
Amtrak - Floridian, San Francisco Zephyr, Southwest Limited, Illini, State House
Posted 05 April 2018 - 06:35 PM
The core bridge route is from Dhaka to where the green line ends south of Faridpur, that is Bhanga. The actual 6km bridge is across the stream that passes close to Faridpur but south of it, by Bhanga. The other stream closer to Dhaka (Burhiganga) used to be once upon a time, a major channel of the Ganga. It is not any more. The route will of course cross that too, but not on something considered a major bridge. Just around 1km or so, and pretty shallow flood stream mostly.
Major movement of streams and channels is a major headache in bridge building. They have to train the river to stay in its channel and not decamp somewhere else. To give you an example of huge channel movements, Bramhaputra which comes in from the north and joins the Padma a little north of Faridpur, Back in the mid 18th century it used to flow mostly through a channel flowing into the Meghna River which flows on the east side (right of Dhaka), and there was very little flow into the main Ganga channel Burhiganga nearer Dhaka, from Bramhaputra. The current Padma Channel was a lesser channel. All these flows got shuffled after a major earthquake in the late 18th century raised the Mymansingh Plateau slightly, causing the Bramhaputra to flow further west and join the Ganga where it does today, and convert Padma into this Godzilla channel that it is today.
Consequently, there is about a total of a hundred miles of river bank protection and training work involved to ensure that the darned river continues to flow under the bridge after it is built, rather than somewhere else.
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Edited by jis, 06 April 2018 - 05:12 PM.
Posted 10 April 2018 - 03:36 PM
Funny you should mention the shifting channels. I was trying to locate the bridge on google maps and on bing maps and the channel was totally different in each of them. Google maps showed the piers of the bridge construction. I was just reading about why the Amazon has no bridges - they would need to be 30 miles long for the high water periods to be able to make it across the flooded channels....
SJ - Norra Stambanan, Nordvästra stambanan, Södra stambanan, Dalabanan
NSB- Bergensbanen, Kongsvingerbanen, Rørosbanen, Dovrebanen, Flåmsbana, Roa–Hønefossbanen
Amtrak - Floridian, San Francisco Zephyr, Southwest Limited, Illini, State House
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