Dick,
Sorry to butt in, but a drop of 1 foot in 176 feet is an appreciable
gradient as far as water flow is concerned. This corresponds to a head of
30 cm or a pressure differential of ~0.5 psi over only 176 feet. To give
you some idea of a typical gradient, the headwaters of the Mississippi are
at an elevation of 450 m (1475 feet) and the river itself is about 3780 km
(2348 miles) long. This gives a gradient of 1: 3780/0.450 or 1:8400,
compared with 1:176 in your example. Try rowing up the mighty Mississippi
some time!
Chuck Vandergraaf
-----Original Message-----
From: Dick Fischer [mailto:dickfischer@earthlink.net]
Sent: Tuesday January 23, 2001 8:39 PM
To: asa@calvin.edu
Subject: RE: verification of flood issues
Steve Smith wrote:
Dick Fischer wrote:
>Yet two rainy Spring seasons with a period of relatively
>dry weather in between would leave ample time for Noah
>and his crew to pole up the Tigris. Anyway, 3000 feet
>of elevation in about one hundred miles doesn't strike
>me as a very steep grade.
I had to wince when I read this line. I have "floated" 100
miles down a river that dropped 3000 feet. It was a 7-day
whitewater rafting trip at mid-water levels. I wouldn't
want to try and go up river in high water in a wooden boat
loaded with animals.
Since I have never heard of white water rafting on the Tigris,
my guess is that the inclination is not as severe as has been
indicated. Even 3,000 feet of elevation in 100 miles works out
to about 1 foot per every 176 feet. That doesn't sound severe
to me. Personally my vote goes for a crew of either Sumerians
or Australopithicines. They don't count either.
Dick Fischer - The Origins Solution - <http://www.orisol.com/>
www.orisol.com
"The answer we should have known about 150 years ago."
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