Browse Forums Landscape & Garden Design Re: Retaining wall drainage, plumbing concerns. 2Aug 21, 2017 9:03 pm Hey there. Why are you putting drainage in front of the wall? That's the absolute opposite of what you should be doing. The back part of your wall should drain any excessive water soaking within the garden bed to alleviate any load or pressure due to the pooling of water. You have mentioned that you are putting a few toe drains through the wall but isnt this also pointless as the wall will now weep water, and also stain your future concrete path? If you have access behind the wall, do both; waterproof the back install one or two ag-pipes, backfill with aggregate and top with some soil. I just posted an update on my thread with detail on the required drainage for my engineered retaining walls if you need further information. Just make sure your ag lines go somewhere, ie plumb them into one of the pits your planning to use for surface runoff on the concrete path. Re: Retaining wall drainage, plumbing concerns. 3Aug 22, 2017 6:52 am Just back to the basics AGI pipes are for sub soil drainage and you should have them behind the wall, your pit should be at the lowest point and if you are getting flooding then you need surface spoon drains. It is unlikely you will get a lot of water in the sub soil drains but more likely you will get a lot of surface water run off. Pay particular attention to gettingg rid of surface water fast. Foremost Building Expert in Australia,assisting with building problems/disputes, building stage inspections,pre-contract review advice for peace of mind 200 blogs http://www.buildingexpert.net.au/blog Re: Retaining wall drainage, plumbing concerns. 5Aug 22, 2017 7:10 am building-expert Just back to the basics AGI pipes are for sub soil drainage and you should have them behind the wall, your pit should be at the lowest point and if you are getting flooding then you need surface spoon drains. It is unlikely you will get a lot of water in the sub soil drains but more likely you will get a lot of surface water run off. Pay particular attention to gettingg rid of surface water fast. Appreciate your response this is all good feedback for me. Definitely i'm putting drainage behind not in front . When you say the pit at the lowest point, i'm installing the pits close to the retainer wall to ease the pressure a bit on my storm water drains, the agi pipe behind the wall will tee connect to three pits in front of the retainer wall which will also act as a good surface drain, do you think its not a good idea, you think i should be putting the pit further away the retainer wall, because the lowest point would be in the corner where the garage door is? The surface water yes indeed i will be putting drain channels where the concrete path meets the retainer wall, that way if get a heap load will be less chance of the fall from the new concrete path flooding into my pergola. Unless i change the fall of of the concrete path, Cheers Re: Retaining wall drainage, plumbing concerns. 6Aug 22, 2017 7:11 am SteveMc Hey there. Why are you putting drainage in front of the wall? That's the absolute opposite of what you should be doing. The back part of your wall should drain any excessive water soaking within the garden bed to alleviate any load or pressure due to the pooling of water. You have mentioned that you are putting a few toe drains through the wall but isnt this also pointless as the wall will now weep water, and also stain your future concrete path? If you have access behind the wall, do both; waterproof the back install one or two ag-pipes, backfill with aggregate and top with some soil. I just posted an update on my thread with detail on the required drainage for my engineered retaining walls if you need further information. Just make sure your ag lines go somewhere, ie plumb them into one of the pits your planning to use for surface runoff on the concrete path. Sorry if i did not make it clear, I have dug up behind the retainer wall not in front to put agi drainage, the dirt dug up in front is for my concrete path. I'm not sure where i mentioned this but i am definitely putting agi behind mate. Thanks for your response i appreciate it. "You have mentioned that you are putting a few toe drains through the wall but isnt this also pointless as the wall will now weep water, and also stain your future concrete path?" Sorry im not familiar with the "toe drain" term? what part of the post you referring to? Re: Retaining wall drainage, plumbing concerns. 7Aug 22, 2017 9:31 am aspire029 "You have mentioned that you are putting a few toe drains through the wall but isnt this also pointless as the wall will now weep water, and also stain your future concrete path?" Sorry im not familiar with the "toe drain" term? what part of the post you referring to? The core drilled sections through the wall will act like toe-drain. A toe-drain is a simple exposed drainage line to allow water to drain away and weep. Unless you plan on sealing these up after putting your PVC in, they will be areas that will weep water into the surrounding ground (ie. around the path/wall area of the slab). You only need one drain and then only connect it to the lowest point in your yard. Re: Retaining wall drainage, plumbing concerns. 8Aug 22, 2017 1:33 pm SteveMc aspire029 "You have mentioned that you are putting a few toe drains through the wall but isnt this also pointless as the wall will now weep water, and also stain your future concrete path?" Sorry im not familiar with the "toe drain" term? what part of the post you referring to? The core drilled sections through the wall will act like toe-drain. A toe-drain is a simple exposed drainage line to allow water to drain away and weep. Unless you plan on sealing these up after putting your PVC in, they will be areas that will weep water into the surrounding ground (ie. around the path/wall area of the slab). You only need one drain and then only connect it to the lowest point in your yard. These core drilled holes are core drilled to where ever the agi pipes will Tee off into which is pretty much close to the footing. Behind that area will be water proofed, i see what your saying though ill make sure its waterproofed and sealed around the pipes entering the holes from the back as well ill put one of those flanges or seals to seal any gaps around the pipes and then water proof it. I need this otherwise i wont have an exit point for my agi and water just fills up and sits there with no where to go. So i have made three exit points that will exit out . I have already drilled out 3 points, will it matter that ill have 3 drain pits on that footpath they wont be overly huge? then ill connect it to the lowest point in the yard. I know it might be overkill but ive already drilled them out. Thanks again Thanks for all replies. I just noticed now the pictures I added to post right on top of page were wrong. I attached pictures showing "current" and my "suggested" floor… 9 14609 Regardless of wall hung toilet or floor pan toilet your feet will be right on drain, seems to me the waste should not be in that location given the design. Also are you… 6 7026 Thank you again Simeon.. I will call my certifier for that. Have a good day 4 5113 |