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</html><description>DRENING &#x2013; Basin calculationSizing of a draining basin&#xA0;For the basin calculation &#xA0;it necessary to insert the size of the area that was made impermeable, the thickness of the gravel above the chambers (15 cm recommended) and the thickness of the gravel under the chambers (10 cm recommended). See the table [&hellip;]</description><thumbnail_url>https://www.geoplastglobal.com/wp-content/uploads/2021/07/Geoplast-Facebook.jpg</thumbnail_url><thumbnail_width>1240</thumbnail_width><thumbnail_height>500</thumbnail_height></oembed>
