| 摘要 |
<p>The panel has top grooves bounding vertical panel sections, and a water permeable bottom area, parallel to the mounting surface. The vertical parts have continuous vertical cut-outs. The panel (1) is of regular material thickness. The depth of grooves (4,5) roughly equals overall panel thickness, reduced by its material thickness. The former is at least four times the latter, and pref. between twenty and a hundred times as great. The panel may be drawn from an originally flat panel made of deformable material. Grooves may be filled with gravel, or similar, to the level of the elevations, and soil for planting, with or without intervening filter layer, can be provided on top.</p> |
