Online tools for design or material acquisition are never absolute. They are only to give an idea of how to select an erosion control blanket or space geogrids in a retaining wall and so forth. Still, they are welcomed and useful in building an understanding of what your project may need. BTL offers pond owners and developers liner estimation tools for full (go to the “continued” link below) and empty ponds (cut and paste the following URL into your browser: http://www.btlliners.com/calculator.php?prod=002a).

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