Subject: thames headstream choice still hanging<br/>
Date: Jun 03, 2004 @ 21:44<br/>
Author: m donner (&quot;m donner&quot; &lt;maxivan82@...&gt;)<br/>
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<div id="ygrps-yiv-723862692">returning yesterday to state line pond<br/>
i failed again to reach the elusive mouth of sawmill brook<br/>
as the neighborhood was too swampy to just slog on over to it<br/>
& no flotation was readily available to put to the task either<br/>
while the available time was too short to improvise further<br/>
<br/>
but i was struck again by how much more water seemed to be exiting the pond <br/>
over the dam than i could confirm was entering it from the east by the <br/>
unnamed stream & approaching it from the lowest bridge on sawmill brook<br/>
<br/>
clearly the other feeder streams<br/>
particularly some coming in from the northwest & west side<br/>
must contribute a substantial proportion of the water too<br/>
<br/>
& there will in fact be no simple formula available to lean on<br/>
like<br/>
inflows a plus b nearly equal outflow c<br/>
as i had hoped<br/>
<br/>
instead it turns out there are at least 4 major inflows plus several minor <br/>
ones contributing to the outflow<br/>
& while none of the other inflows can compete with the 2 biggest ones i have <br/>
been trying to compare<br/>
nevertheless taken all together they do throw my approximations for a loop<br/>
& set me back to either importing a canoe or comparing watershed areas as <br/>
shown on the topos<br/>
<br/>
or in other words i took a few pix but made no real progress to speak of<br/>
<br/>
<br/>
today<br/>
still scratching my head over this temporary show stopper<br/>
& realizing all 3 of my free travel opportunities had already slipped away<br/>
i experimented a little with printing topozone topos at my local library<br/>
just to see if i could distinguish & compare watersheds well enough using <br/>
such a low tech means<br/>
& thus improve upon or cut corners from my remaining options<br/>
<br/>
& directly i began trying to surround my shed puzzle by printing a patchwork <br/>
of maps in this way<br/>
when either the library computer or the topozone site quit on me<br/>
<br/>
but i did determine the method should be doable in principle<br/>
provided the margin of difference isnt so thin as to throw the result back <br/>
into the range of pure guesswork<br/>
<br/>
& i also guessed that the procedure<br/>
however elaborate & drawn out it might become<br/>
could be preferable to either slinging a canoe or ordering usgs topo sheets <br/>
& waiting for them to arrive<br/>
<br/>
so<br/>
to be continued as early as tomorrow<br/>
<br/>
<br/>
<br/>
but in the meantime<br/>
a question for truth seekers<br/>
<br/>
when a dam causes several confluences in the stream above it to all rise <br/>
together to the level of the resulting pond<br/>
as has actually occurred in the case of state line pond<br/>
should all the confluences still be analyzed in the original but now <br/>
submerged ascending sequence of the natural thalweg<br/>
so as to assess at every ghost fork in succession which contributary would <br/>
be channeling more water<br/>
<br/>
or should the pond as a whole be considered a single multiple confluence of <br/>
all its feeders at once<br/>
& the single biggest one of them declared the main headstream outright<br/>
somewhat like a candidate winning a single election by a mere plurality over <br/>
all others<br/>
rather than winning a series of primaries &or runoffs by clear majorities in <br/>
every case<br/>
<br/>
in other words does the presence of the artificial dam alter the natural <br/>
principle of the sawanabori<br/>
<br/>
<br/>
i can foresee 2 different outcomes depending on how this question is <br/>
answered<br/>
<br/>
& i have already satisfied myself as to how i would answer it<br/>
but still wonder what anyone else thinks<br/>
<br/>
_________________________________________________________________<br/>
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