Posted: Sat Aug 20, 2016 8:26 am
I have just had installed a land drainage network but having read the webpage on this website I am now very concerned about the problems I think might happen. My garden has a natural fall of over 1m from the house to the bottom of garden. It has a ditch on one side (right) that is 1.5m lower than the lowest point which is on the opposite side. The soil is heavy clay. The landscape gardener has dug a trench from the lowest point (32.26) to the ditch floor (31.04) and laid in 21m of plastic land drainage pipe 160mm diam., on top of bed of 40/60m stone. This runs across the bottom of the garden. He did not compact the stone before laying the pipe on top. He then laid on top of that more 40/60m stone and laid on top a strip of weed surpressing fabric and back filled without compaction with the clay he dug out.
This pipe is to take all the surface water from house and garden (1 acre) into the ditch.
He then dug out 4 trenches at right angles to this pipe and laid in 100mm pipe. He did not use any connectors to join the 100mm to the 160mm. He did the same as he did for the 160mm using the same material etc.,
He has also dug a trench and laid in Osmo pipe for the surface water from the house and conservatory which he has run to the end of the 160mm pipe and again has not used any connectors. He has also not used any end caps on any of the pipes.
He has also dug herring bone trenches for more 100mm pipe which in places is less than 1 ft from the surface and again no connectors used.
To cap it all whilst digging trenches for water and power he cut through the land drainage pipes he installed and fixed using OSMO and mastic. He has also driven cement lorry, dumper trucks and diggers over the whole area so I can now see by the drop in soil level where the ditches are. I intend to grow trees and shrubs in areas that have piping and I am very concerned that the right materials have not been used, no compaction has been done and no Geo textile envelops the stones in the trenchs, no concrete apron has been built at the outfall and it looks like the size of the stone used will cause sinkages in the level of the land. Am I right to be concerned ?
This pipe is to take all the surface water from house and garden (1 acre) into the ditch.
He then dug out 4 trenches at right angles to this pipe and laid in 100mm pipe. He did not use any connectors to join the 100mm to the 160mm. He did the same as he did for the 160mm using the same material etc.,
He has also dug a trench and laid in Osmo pipe for the surface water from the house and conservatory which he has run to the end of the 160mm pipe and again has not used any connectors. He has also not used any end caps on any of the pipes.
He has also dug herring bone trenches for more 100mm pipe which in places is less than 1 ft from the surface and again no connectors used.
To cap it all whilst digging trenches for water and power he cut through the land drainage pipes he installed and fixed using OSMO and mastic. He has also driven cement lorry, dumper trucks and diggers over the whole area so I can now see by the drop in soil level where the ditches are. I intend to grow trees and shrubs in areas that have piping and I am very concerned that the right materials have not been used, no compaction has been done and no Geo textile envelops the stones in the trenchs, no concrete apron has been built at the outfall and it looks like the size of the stone used will cause sinkages in the level of the land. Am I right to be concerned ?
