| 摘要 |
A roof gutter 2 comprises a collection channel 4, purification means 6, 8 and subsequent drainage means 10 to permit rainwater that has become contaminated after passing over a rooftop to be purified before entering a mains drainage system, or to be collected for re-use around a property. The purification means comprises a layer of particulate material 6 designed to slow the permeation of water through the roof gutter 2 prior to entering a suitable filter medium 8. This allows for efficient purification of the water. During heavy rainfall, excess water collecting in the collection channel is able to bypass the filter 6, 8 and pass directly into a mains drainage system to prevent flooding. Drainage apertures 20 in a barrier 18 positioned just prior to the entrance of the drainage means allow this to occur. |
