| 摘要 |
<p>The paving system has a perforated pavement (1) covering a deep substrate of mainly hard nodules or shells, the whole being surrounded by impervious walls (5) to provide temporary storage in the interstices for chemical spillage or flood water, wherein liquids may be chemically treated or biologically decomposed, and whence the rate of outflow may be regulated. The pavement may consist of preformed pavings of brick, concrete or other material, laid edge to edge without mortar or cement. These pavings may be perforated or notched to allow liquids to run down into the substrate. The pavings are laid on a screen (2, 3) which filters out solid particles to stop the system clogging. This system allows biological substances to grow, or be introduced with or without additional nutrients, or chemical treatments to be introduced, from above, when needed. The whole pavement system can be lifted out for cleaning or substitution, and relaid as new.</p> |
