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Pastimes : Canoes, Hiking, the Great Outdoors

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To: Biker who wrote (172)	7/21/1999 2:17:00 AM
From: Dayuhan	Read Replies (1) of 325

I'm curious: how do you estimate mph in moving water? It's always been hard to come up with comparison scales, and that sounds like an interesting one. A lot of river comparisons are so subjective, even the ones that sound scientific. CFS (cubic feet per second) sounds real exact, but I haven't the foggiest idea how to measure it. The drop per mile or km is usually a good indicator, and can be easily calculated from topographic maps, but how do you know the drop isn't all in one spot? Even the usual grading scale depends a lot on who is doing the grading and what the water conditions are at the time. A lot of paddlers tend to grade low to show how skilled they are; the danger there is that somebody who hears that a river is grade 3 when it could be graded 4 might go out and get in well over their head. We have lots of rivers here that are normally easy 3s with a few portagable grade 4 stretches that can turn into grade 5 monsters after a typhoon. I guess the moral of the story is to look yourself, be careful, and don't run any horizon lines, but I'm still curious about how you estimate water speed.

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