Browse Forums General Discussion 1 May 16, 2022 9:04 pm Hi all, We are in the last couple of weeks of our build and today the drains were connected to stormwater. Before today we had noticed that the grate/pipes drains in the ground we’re slightly misaligned with the square drainpipes. We assumed some sort of S bend connector would be used to connect the drains and pipes. However, the stormwater guys have been today and all they have done is just pop these grates on the pipes in the ground- I assume to help direct the flow of the water. It looks to us like if there was a heavy down pour, half would go into the drain and half would just rush out onto the ground behind the pipes. I just wanted to know if what they have done is standard practice? Do these photos look ok? Thanks Kelsey [img:13lxfkvq]https://forum.homeone.com.au/u/96056_1652699834.jpeg[/img:13lxfkvq] Re: Down pipe connection to storm water? Is this correct? 2May 17, 2022 12:14 am No! The BCA requires the first 1000mm to fall out from the slab, to prevent ponding next to the slab creating abnormal moisture conditions. For drainage to work you install the inlet/s at the lowest point. The drain inlet gullies have actually been installed at the highest point, this means water will grade away from the slab to sit (no drain) 1m away from the slab. The more rain the more water will collect 1m away but it will slowly increase in depth flooding back up toward the slab, it wont react the slab as it will most likely drain into the trench and act like a moot around your house causing big abnormal moisture movement causing localised heave, stressing the slab. The height above the ground is to allow you to be able to lay turf and cut the drains to suit the finished ground level. Only problem is the rain between now and when you cut the drains to the final finish height means you don't actually have any drainage. Right now it is non compliant with the BCA as drainage is not effective, its badly designed as the inlets are on the highest section of the slope, (they should be in the hollow) and if the builder hands over the site like that (your image) you haven't addressed the stormwater surface water drainage which means you as well as the build are equally responsible for slab movement. They need to relocate the inlets to actually work and adjust them to work now. We are Expert Consultant's, and we are here to help. Re: Down pipe connection to storm water? Is this correct? 3May 17, 2022 12:51 am WA is a whole different world where things are done differently plus they are on sandy soil. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Down pipe connection to storm water? Is this correct? 4May 17, 2022 1:24 am yeh, I noticed the WA on kelsey's profile after posting We are Expert Consultant's, and we are here to help. Hello I am developing 2 side by side units. Wish someone can help me on the following questions 1) Which stage should be the storm water pipe installed during the new… 0 7939 If you need to be able to access these then you may need to dig them out and cut them so you can add a socket and a riser to the required height. We normally add a… 1 6926 Thanks for that, the PVC pipe is still about 40cm below ground level and it sticks out of the sand with no end cap or anything on it just open pipe, is this the finished… 2 10661 |