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headwaters means non-tidal rivers, streams, and their lakes and impoundments, including adjacent wetlands, that are part of a surface tributary system to an interstate or navigable water of the U.S. Upstream of the point on the river or stream at which the average annual flow is less than five cubic feet per second. The Corps of Engineers may estimate this point from available data by using the mean annual area precipitation, area drainage basin maps, and the average runoff coefficient, or by similar means. For streams that are dry for long periods of the year, the Corps may establish the point where headwaters begin as that point on the stream where a flow of five cubic feet per second is equaled or exceeded 50% of the time.

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Watershed Study

I am a high school Biology teacher trying to do a watershed study of a large natural lake. Our students will take a canoe trip from the headwaters to the lake, make a relief map, study weeds along the way (invasive and native), do a water depth study at the deepest spot on the natural lake, ...

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by pamschumm
Thu Aug 11, 2011 12:53 pm
Forum: Ecology
Topic: Watershed Study
Replies: 1
Views: 2413

A Monkey's Uncle

... another reply somewhere else on this page. I find it incomprehensible that these fish face the rigours of the upstream journey and arrive at the headwaters, exhausted. Then, with the last few scraps of what energy they have left, they are forced to make massive morphological changes, pass on ...

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by JDavidE
Sat Mar 17, 2007 11:00 pm
Forum: Evolution
Topic: A Monkey's Uncle
Replies: 26
Views: 62881

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