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<blockquote data-quote="Umbran" data-source="post: 1292849" data-attributes="member: 177">The new tunnel has 3 times the cross sectional area of the old one.&nbsp; It therefore will move three times the amount of water...&nbsp;It will fill that 1 square mile lake in a day if the water is moving at a lazy 7 mph or so.Or, it can fill a 1 mile square, 10 foot deep lake in 8 hours, if the water is moving at the original 22 mph.&nbsp; It'll fill a square lake 1.7 miles on a side (or a circular lake of about a mile radius) in one day.&nbsp; That does *not* mean the lake wil be 2 miles in radius in two days.&nbsp; There's loads of ways to make the water move faster - I figure that you can have it move as fast or slow as you like - though making the water super-sonic would be stretching plausibility, I think.&nbsp; The other plausibility issue is that while you don't have &quot;air resistance&quot; you do get friction with the sides of the pipe.&nbsp; Again, you can set your water speed as you wish, but unless that pipe is really smooth sided and intended to carry water, you'll see lots and lots of erosion.&nbsp; Eventually, the thing will collapse itself.</blockquote>

[QUOTE="Umbran, post: 1292849, member: 177"] The new tunnel has 3 times the cross sectional area of the old one. It therefore will move three times the amount of water... It will fill that 1 square mile lake in a day if the water is moving at a lazy 7 mph or so. Or, it can fill a 1 mile square, 10 foot deep lake in 8 hours, if the water is moving at the original 22 mph. It'll fill a square lake 1.7 miles on a side (or a circular lake of about a mile radius) in one day. That does *not* mean the lake wil be 2 miles in radius in two days. There's loads of ways to make the water move faster - I figure that you can have it move as fast or slow as you like - though making the water super-sonic would be stretching plausibility, I think. The other plausibility issue is that while you don't have "air resistance" you do get friction with the sides of the pipe. Again, you can set your water speed as you wish, but unless that pipe is really smooth sided and intended to carry water, you'll see lots and lots of erosion. Eventually, the thing will collapse itself. [/QUOTE]

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