A little help with a Scottish accent:)

[Jeroen1000]

Hi guys,

This is nothing but a call for help. I'm translating Nicholas Crane's documentary to my native language for a school project. The good news is that I'm almost done but there are some words/fragments I really don't understand:

1. The Scottish person talks about putting up something where they redirect the river towards (he says the word 3 times...)
2. Then he says something like 'of what you call the r...'
3. All he says after 'and obviously' (I think this is the last sentence he says).

There is about 30 seconds of audio and I don't get a few words and one sentence or so:). The file can be downloaded 10 times so give me a shout If it's not available any longer.
I must have listened 100 times now but I just can't make anything out of it.

http://rapidshare.com/files/232869461/Britannia1_chunk.wmv.html

Any help is much appreciated!