You are reading a single comment by @mespilus and its replies.
Click here to read the full conversation.
-
Yes, it would be helpful if the concept of SuDS actually incorporated minimum permeability figures. Round here, outer north west London, flooding in June 2016, Nov 2019, the best pavers offer is a thin line of Aco-Drain at the threshhold to the pavement.
The local authority, who uses a term contractor to 'do' all the dropped kerbs,
routinely just 'tarmacs' the driveway across the pavement.
Its all an uphill struggle.
Many more people now wished they lived uphill.
mespilus
Fascinating stuff, I am probably the only person who will actually read it. I can see the sense in urban areas which are pretty much all impervious surfaces. In my mainly rural area 99% of anything I pave drains into a surrounding garden of which the paving forms less than, say, 5%. In the few cases where drainage is needed I either use soakaways or fanned permeable pipes into surrounding woodland or fields. In one case where flooding was an issue around a house built on clay in a valley bottom I constructed an automatically pumped system into a series of reed ponds. In 20 years I have only twice sent water into the main groundwater drains. I do have my doubts about the permeable membrane/ resin and gravel joints system as surely this would be overwhelmed by any heavy or persistent rain, but I suppose something is better than nothing.