Permeable asphalt/tarmac... on a slope?

1 Sep 2008
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United Kingdom
My front garden slopes gently away from the road toward my house. It's 28 feet / ~8m long and the drop is around 1 foot. It's currently gravel onto bare earth (no sub-base) so I've never had any issues with flooding.

I'd like to put in a new driveway. I do have some constraints though - due to site lay-out there isn't anywhere suitable for a proper Part H compliant soakaway. Also the downpipe for the gutters is on my neighbour's side (semi-detached) so I can't cut into that. As a result, any driveway I put down needs to be permeable, and able to cope with a slight slope.

How permeable is permeable asphalt/tarmac? On my slightly-sloping site would it be permeable to prevent run-off just pooling up against my house?

Are there any mitigations I can put in place to help (short of raising the driveway to remove the slope)?
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I think raising the driveway is out of the question if it is to run towards your house. Raising by 12" will probably bridge your damp course unless you stopped short of the house wall.

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