Browse Forums Landscape & Garden Design 1 Apr 04, 2011 9:34 pm We have a side of house where the neighbour's land level is higher than ours (I know, this happens a LOT). We wanted to concrete all the way to the fence, however we became aware of some "issues" they are creating on the other side, essentially causing water to flow underground onto our side and saturate around the house slab if it's really bad. So, we need some subsoil drain along the fence - and the only thing that is there really is the ag pipe. Now, should we just burry it and concrete over it, or should we leave a pocket of say 30cm from the concrete to the fence, for the ag pipe and some gravel all around it? If there are ever any blockage issues, we could get to the pipe much easier than if it was concreted over. What would you do? My signature is distracting people from my wise posts ... Re: Compact solution for subsoil drainage 4Apr 06, 2011 12:22 am You could have a layer of geotextile under paving or gravel or concrete that falls away from the house. A layer of gravel, then the paving material. At the base of the drop or slope, dig a trench which has a shallow fall, some gravel into that, then ag pipe and the rest gravel. Then everything leaches down into that and out to storm water. Better still is the panel drain that Geofabrics Australia do. Re: Compact solution for subsoil drainage 5Apr 06, 2011 8:15 am Fu Manchu You could have a layer of geotextile under paving or gravel or concrete that falls away from the house. A layer of gravel, then the paving material. At the base of the drop or slope, dig a trench which has a shallow fall, some gravel into that, then ag pipe and the rest gravel. Then everything leaches down into that and out to storm water. Better still is the panel drain that Geofabrics Australia do. Thanks Fu! I'm just not clear why should I have a layer of geotextile under the concrete path? I thought that we should just concrete "as per usual" and then insert the ag drain along the pathway/concrete (and slope it to stormwater outlet). So, you reckon that we shouldn't really burry the pipe under the concrete path, just in case?? My signature is distracting people from my wise posts ... Re: Compact solution for subsoil drainage 6May 13, 2011 3:55 pm Hey, look at this old thread!! Anyways, if anyone's still reading, we decided not to concrete over. Some sources are saying that ag pipes can become blocked, and if you don't really have to concrete over it, then don't. So, we'll have access to fix/clean/replace if ever needed. Also, heard from a reputable business that it's not good to use socked ag pipes in clay - because (allegedly) clay, when wet, dissolves into fine particles which block something ... I guess the sock ... so water just bypasses the ag pipe - supposedly! So, that's our latest worry - to sock or not to sock ... My signature is distracting people from my wise posts ... Re: Compact solution for subsoil drainage 7May 13, 2011 7:53 pm Lex, I would leave the 300mm gap (more if possible) between path and fence and excavate a trench say 600mm deep in this space. Line the excavation with geo fabric and then lay ag drain in the bottom of the trench. Backfill with clean 20mm rock (bluemetal) to 100m from surface. Wrap the geofabric over the top of the gravel to make a 'parcel' of gravel. Backfill over the cloth with decorative gravel of your choice. You have created a large drainage void which should be pretty stable and should remain serviceable for quite a few years. Can acces it too. Now run your ag drain to a collection point or if unable to, that structure should function OK as a french drain type soakaway arangement despite the clay. Not much else you can do in such a narrow space with clay, which is a real PITA. Looking at some of the designs on websites, they are all selling very similar products. I get that you want something stylish. It's worth looking for search terms like SaveH2O… 2 7009 Hi We are building in the Hunter Valley, our soil test is H1, our builder has advised us they need to have a letter signed for Fair Trading as the new drainage standard… 0 3552 Sorry! I'm new to this forum and have made a mistake in my posting! I'm looking for a structural solution to a stand alone wooden pickets fence with no structural rail… 1 3298 |