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Have you tried requesting data on caves from the TSS for that area? Might save
you some time and trouble. Then again .....
Jerry.
Sent from my iPhone
On Jun 1, 2017, at 7:24 AM, Geary Schindel via Texascavers
<texascavers@texascavers.com> wrote:
> Folks,
>
> I’ve been working on a tracer testing project near Rocksprings, Texas over
> the last couple of months. We’re partnered with UT-San Antonio, Devils
> Sinkhole State Natural Area, Nueces River Authority, Real Edwards
> Conservation District, TTU – Junction, and local landowners. Our interest is
> to test the groundwater boundaries between the Llano and Nueces River basins.
> The surface water basin is located on the ridgeline east of Rocksprings that
> generally follows highway 377 from Rocksprings east to the junction with
> Highway 41. The groundwater divide may be much further north and in the Llano
> River Watershed. It is not uncommon for groundwater and surface water
> boundaries to not agree. This may explain the presence and size of the Devils
> Sinkhole since it is relatively close to the surface water divide and also
> implies there is a large conduit and cave system at depth feeding the springs
> on the Llano and Nueces rivers. The identification of the groundwater
> boundary is important in calculating recharge contributions for the Trinity
> and Edwards Aquifer groundwater models to obtain an accurate water balance.
>
> We’ve had problems finding suitable injection points in the area for dye
> tracing. We have good coverage of the potential discharge points (springs and
> wells) but need to find some caves or sinkholes we can use for the injection
> of dye.
>
> We have started one tracer test from Devils Sinkhole but the results have
> been inconclusive as we probably didn’t use a sufficient quantity of dye. We
> plan on repeating the tracer test in Devils Sinkhole in the very near future.
> We also have access to a large ranch on Sunday to walk the drainages to the
> north of Route 377. The thought is that there may be some small sinkholes or
> caves on the property that would allow us to inject water for a dye trace.
> What I need is the critical eye of cavers to help identify said features.
>
> So, I’m looking for some help from cavers to come out on Sunday (June 4) and
> walk the property and evaluate karst features. While I can’t pay you or even
> cover your costs, I can offer an interesting opportunity and potential for
> new caves, participation in some interesting science, the undying gratitude
> of the citizens of the Nueces and Llano River basins, and the sense of
> accomplishment of a job well done (what more could you ask for).
>
> If you’re interested in helping, please send me an email at
> gschin...@edwardsaquifer.org<mailto:gschin...@edwardsaquifer.org> or call me
> at 210.326.1576 (cell) and I can fill you in on the details.
>
> Thanks,
>
> Geary
>
> [https://ucarecdn.com/cfe99bfa-9ee9-4330-862f-aee807af1b4c/-/resize/132x68/img.png]<http://www.edwardsaquifer.org/>
>
> Geary Schindel
>
> Chief Technical Officer
>
>
>
> www.edwardsaquifer.org<http://www.edwardsaquifer.org/>
>
>
>
> 210.222.2204 ext 346
>
>
> 900 E Quincy
> San Antonio, TX 78215
>
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