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        "description": "<p>Dams don't always hold water back; sometimes they have to let it through. A number of thrill seekers are requesting the release of water so they can enjoy a day of white-water rafting!</p>", 
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        "title": "I Didn't Know That: Dam-Release Rafting", 
        "url": "http://video.nationalgeographic.com/video/science/weird-science-sci/idkt-dam-release-rafting/", 
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                    "url": "http://adventure.nationalgeographic.com/adventure/trips/ultimate-adventure-bucket-list/#/nextbest/18", 
                    "name": "Raft the Grand Canyon"
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        "credit": "National Geographic", 
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        "transcript": "<p>JONNY PHILLIPS: Dams don't always hold water back, sometimes they have to let it through.\u00a0 For example, if there's a threat to the dam's integrity, or they need to increase supply downriver, then they'll open the valves.</p><p>RICHARD AMBROSE: Go on Jonny, really let it rip!</p><p>JONNY PHILLIPS: Right.</p><p>RICHARD AMBROSE: Go on!\u00a0 [Laughs] - look at that!\u00a0 Jonny, you've broken it!</p><p>NARRATOR: This valve alone can release over 8000 litres of water a minute.</p><p>RICHARD AMBROSE: Now that is a lot of water!\u00a0 Turn it off!\u00a0 Turn it off!</p><p>RICHARD AMBROSE: Now there are a few dams in the country where a release of water can be requested by anyone.</p><p>JONNY PHILLIPS: You might be a farmer downriver who just needs a bit more water released to irrigate their land.</p><p>RICHARD AMBROSE: Or an environmental group concerned that lower water levels downriver are compounding the effects of pollution.</p><p>JONNY PHILLIPS: But you do have to pay.\u00a0 For water to be released for a whole day it can cost 1500 pounds.</p><p>NARRATOR: But despite the cost, an increasing number of people are requesting the release of water so they can enjoy thrill seeking recreational pursuits!</p><p>JONNY PHILLIPS: And one of the most popular of those activities on this river is whitewater rafting.\u00a0 But just how much difference can a release of water from a dam upriver make?</p><p>RICHARD AMBROSE: Well we're not moving at all at the moment and the river is just flowing gently, but we've been told they're gonna release a load of water from the dam up above and this river is gonna turn into a monster.</p><p>NARRATOR: With the dam open, the amount of water flowing down this river increases to a massive 900 million litres, that's 50 times the normal amount, which means the boys will be travelling down it 10 times faster than normal!</p><p>JONNY PHILLIPS: This is the biggest drop of the river.</p><p>RICHARD AMBROSE: That's a big one!\u00a0 Oh my word!</p><p>JONNY PHILLIPS: Oh my word!</p><p>RICHARD AMBROSE: Here's the biggun!</p><p>RICHARD AMBROSE: Without that dam up there we couldn't do this today.\u00a0 And more and more places across the UK are taking advantage of dams to have fun! Let's do it again, come on.</p><p>JONNY PHILLIPS: Sounds like a damn good idea to me!</p><p>RICHARD AMBROSE: For that you're carrying the raft, mate.</p>", 
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