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    Re: An essay about maps
    From: Fred Hebard
    Date: 2010 Nov 15, 08:36 -0500

    Looks like I underestimated the size of the catchement area.  It
    seems closer to 5000 than 1000 acres guessing roughly from topo maps.
    
    On Nov 15, 2010, at 7:06 AM, Fred Hebard wrote:
    
    > I'll ask a friend who works at TVA and try to get back to you all.
    > I doubt the official TVA story, since the catchement area behind
    > the dam is only 1000 acres or so.  My bet is that the TVA story
    > glosses over a plain, ordinary screw up.
    >
    >
    > On Nov 15, 2010, at 12:39 AM, Frank Reed wrote:
    >
    >> Fred Hebard, you wrote:
    >> "I live near Bristol, VA/TN. A dam was built on the Virginia side
    >> (just northwest of Exit 7 on I-81) but the lake never filled; I'm
    >> not sure why, have heard that the ground leaked (limestone soils/
    >> karst topography). Regardless, the Google map depicts the lake
    >> that's never been there!"
    >>
    >> Fred, I LOVE that one. The trails run right through the middle of
    >> the phantom reservoir. And apparently you can play soccer
    >> underwater. Here's the coordinates of the reservoir if anyone
    >> wants to visit: 36.6467,-82.1091.
    >>
    >> The TVA, which built the dam, states on their web site that the
    >> Beaver Creek Dam is "a flood detention dam with no permanent
    >> reservoir pool." It seems that it was designed only for emergency
    >> flood control. But somehow, decades ago, the USGS mapped it as a
    >> filled reservoir (Google gets their basic data in the US from the
    >> USGS). I wonder if the TVA ever let it fill up just to test its
    >> integrity... Probably more likely that boundary just represents
    >> the potential size if a flood ever requires closing the dam. By
    >> the way, I could find no references to geological or soil issues.
    >> The TVA counts it as an active flood-control structure, and it
    >> will probably work just fine if Bristol ever needs it.
    >>
    >> -FER
    >>
    >>
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