TN visual sinkholes < 3m quads/3x3 (original) (raw)
We substract out the digital sinkholes (3m+) from the visual count, and what remains are visual sinkholes with depth less than 3m. Click on cell for quadname and sinkhole count. Based on 3x3 cells over a topo quad. TN topo is about 60 sq miles, so each cell is about 6.7 sq miles.
100+ 50-100 10-50 1-10 |
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See TN sinkholes