Drainage small garden 9.7mx9m for patio extension


Postby welshjim22 » Sat Feb 27, 2016 9:51 am

I don't know if anyone can help. We are due to have a patio extension and artificial grass installed this week. I agreed to dig the foundation for the patio but found half of the ground very spongy. We have ascertained that this is about a foot deep of soft clay where the garden previously had standing water. Below this we are on the hardcore from the house build, new build house. The builder came round and said that we could fit a soakaway in the centre of the garden which would allow for more water from extended patio without affecting the base of the grass.

The problem being there is only 9.7m between our house and our neighbours. The builder said the soak away shouldn't be closer than 5m to a building but the actual minimum is only 4m and as it won't be taking water from our house only the water already in the garden soil we would be compliant with guidelines.

Is this correct. Is the 5m rule only for building drainage soakaways as opposed to just patio. New patio would be 3x3.6m next to 40m2 of artificial grass on a compacted subbase.
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Postby diggerjones » Sat Feb 27, 2016 7:26 pm

If you are on clay a soakaway won't work. A soakaway in clay is a pond.
For the fake grass you will need good drainage too.
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Postby welshjim22 » Sat Feb 27, 2016 9:21 pm

The clay or clay like top soil is only a foot deep. It's really only the isolated spot of about 3m by 1m. The rest of the garden is hard.
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Postby diggerjones » Sun Feb 28, 2016 6:12 pm

The 5m rule would be for building regs I think you will be ok a bit nearer to the house
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Postby welshjim22 » Sun Feb 28, 2016 9:05 pm

Do building regs not apply in this case as it's purely garden related?
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