An
article yesterday from Reuters describes flooding on Wednesday in the NY subway system.
For those interested in a more technical discussion of NYC subway waterproofing, or waterproofing tunnels in general,
Tunnels and Tunnelling International has recently had a few good articles that just *might* tickle your fancy!! The May 2007 issue discussed in brief a few complications with the water table for the construction of the 2nd Avenue cavern in NYC (see pp 21-22). Here they explain that they will not block inflowing groundwater completely for the project but rather slow it and pump the rest. We will see whether or not, given these recent floods, this strategy remains the same.
If you just have to know more about waterproofing tunnels than this small quip provides, then the April 2007 issue may sate your edgy tastes (pp 50-52). This article covers the topic in question from grouting and temporary control to high quality concrete and sprayed membranes. I won't even go into the
microbial method (
but you sure can!).
I'll post up some links to these articles if I can find them, otherwise the items can just be found in the library.
According to Reuters, Kystverket, the Norwegian Coastal Administration has approved plans for the world's first shipping tunnel. Likely to cost around $310 million, the tunnel would span 1,700 metres (5,577 feet) across the base of the Stad peninsula. The tunnel is to be located well inland where the openings would be sheltered from the raging storms of the North Sea.
