Skeletank Drainage Attenuation
Posted 04 April 2016 - 10:24 PM
I have seen online the Skeletank use and procedures but at a stated cost of £250 per 300l capacity crate where probably 5 crates per house is needed it is expensive.
Skeletank does seem to be user friendly with no major skill set needed for its installation and a minimum ground cover of 150mm.
I welcome any advice or knowledge on Skeletank or alternatives for this controlled discharge rate drainage need.
Posted 05 April 2016 - 07:21 AM
Worth hunting around, as they often seem to be left over ones from bigger projects (ours came from a big civils job going on just down the road).
Search for "soakaway crates" on places like ebay and gumtree and see if you can find any nearby bargains.
Edited by jsharris, 05 April 2016 - 07:26 AM.
Posted 05 April 2016 - 08:39 AM
What a price...well done.
I will keep a look on ebay etc.
I will research but did you find them easy to install.
Posted 05 April 2016 - 09:01 AM
There are several makes of soakaway crate now and the only thing to watch is the load rating, if you're doing as I did and putting them underneath a drive. If they are going under a lawn or garden then the light duty ones are fine.
They are easy to install. Just dig a hole big enough to take the size of crate array you need, lay terram membrane in the hole, stack the crates in and fit the locking clips/tubes in place to hold them together, and knock out where any drainage pipes are going to fit. Then pull the membrane up the sides and fold it over the top, like wrapping a parcel. Cut two slits in the membrane over the place where drainage pipes are going to fit (if you're connecting them to rainwater drainage) and push the pipes in. Backfill around the crates with shingle or free draining stone and you're done.
We fitted 16 crates under the main part of the drive and another 4 under the drive just in front of the garage, so we have in total around 3,920 litres of surge rain water storage capacity.
Posted 05 April 2016 - 11:01 AM
Posted 17 April 2016 - 09:57 AM
I am now more aware of the need for the specialist skeletank system; my levels are rather critical and the SuDS system has to work within close parameters i.e. I cannot dig a deep hole for either a soak away or conventional crates on parts of my site.
I am still investigating SuDS requirement/s and any alternative to Skeletank crates.
Again thank you for your input.
Posted 17 April 2016 - 10:16 AM
We did have to lay things out very carefully under the drive, making sure that the crates were at just the right level so that they didn't end up sitting in the clay. We made the hole a fair bit larger than the crates all around, and backfilled with hardcore, in the hope that we could improve the soakaway performance a bit, by allowing drainage around all sides of the crates to the corner where the permeable soil is.
I tested ours when clearing out our borehole, by pumping around 1500 litres per hour of water into it for whole days at a time. One day I pumped around 20,000 litres of water into the soakaway and the only indication was that the pavers at the very bottom of the drive started to get a bit damp, as we'd clearly waterlogged the whole of the drive permeable sub-base and filled the crates, but I was surprised that we managed to drain water away at a rate that must have been a fair proportion of the pump capacity - I'm guessing that we were draining around 1000 to 1200 litres per hour from the crates, pretty impressive for such a modest area of permeable drainage available.
Edited by jsharris, 17 April 2016 - 10:17 AM.