Posted: Wed Mar 16, 2005 6:13 pm
Firstly Hello.
Secondly a bit of backgound. I'm currently in the process of laying a 40m2 sandstone patio in my back garden. The patio will sit against the house and project into the garden about 5m where it reaches a retaining wall (about 400mm high) holding back my sloped (towards the house) garden. The house has been extended and the door in the new extension is about 50mm lower than the patio doors on the original house, I therefore plan to have the patio fall away from the house and down towards the extension side leaving me 150mm below both doors. So thats the background, now to my questions.
By running the fall in this direction I'm running away from the only access I can find to the surface water drainage, however by running this way I do end up very close to an existing foul manhole which is about 1.7m deep. My questions are:
1. Can I break into this foul manhole to drain the surface water from the patio even though I have a dual system? (BTW the rest of the drain is encased in concrete so I can't break into it at any other point other than the manhole)
2. If I can do the above, can I have the surface water enter the manhole significantly above the benching, say 1m down to just discharge into the sewer from above?
3. If I can't do 1 above do you have any other suggestions? There is a chance that the surface water drain is below the foul drain, but this would mean digging an exploratory trench about 2 m deep!
Thanks
Zebrano
Secondly a bit of backgound. I'm currently in the process of laying a 40m2 sandstone patio in my back garden. The patio will sit against the house and project into the garden about 5m where it reaches a retaining wall (about 400mm high) holding back my sloped (towards the house) garden. The house has been extended and the door in the new extension is about 50mm lower than the patio doors on the original house, I therefore plan to have the patio fall away from the house and down towards the extension side leaving me 150mm below both doors. So thats the background, now to my questions.
By running the fall in this direction I'm running away from the only access I can find to the surface water drainage, however by running this way I do end up very close to an existing foul manhole which is about 1.7m deep. My questions are:
1. Can I break into this foul manhole to drain the surface water from the patio even though I have a dual system? (BTW the rest of the drain is encased in concrete so I can't break into it at any other point other than the manhole)
2. If I can do the above, can I have the surface water enter the manhole significantly above the benching, say 1m down to just discharge into the sewer from above?
3. If I can't do 1 above do you have any other suggestions? There is a chance that the surface water drain is below the foul drain, but this would mean digging an exploratory trench about 2 m deep!
Thanks
Zebrano