Browse Forums Building A New House Re: Stormwater drainage issue due to fall of land 3Nov 06, 2013 8:45 am 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: Stormwater drainage issue due to fall of land 5Nov 06, 2013 12:43 pm 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: Stormwater drainage issue due to fall of land 6Nov 06, 2013 12:46 pm ----------------------------------------------- http://pab34newdigs.blogspot.com.au/ ----------------------------------------------- Re: Stormwater drainage issue due to fall of land 8Nov 06, 2013 11:07 pm 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: Stormwater drainage issue due to fall of land 9Nov 09, 2013 1:46 pm 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: Stormwater drainage issue due to fall of land 10Nov 10, 2013 8:38 pm Hi building-expert, I am using an architect, however after the initial concept of the house, he passed on the work to his side-kick for finalisation of any minor changes. In regards to the fall, we raised the levels early, however we were informed to wait until the demolition and site-cut was complete to determine if the fall would be satisfactory for a gravity solution. Anyhow, I informed the plumber about a charged solution, however he is very reluctant to put one in. He even made a comment that if I insisted, that he wouldn't sign off on it. When I quized him as to why, he said he was worried that if the pipes cracked or leaked, that it may affect the foundations. Part of the stormwater runs beneath the garage slab as well. Secondly, if I had driveway grate and agi piping going into the stormwater, would this cause any issues on a sealed/charge stormwater solution. I am happy to consult a civil engineer / hydraulics engineer who would give him some further confidence on such systems. Any recommendations from anyone. Re: Stormwater drainage issue due to fall of land 11Nov 11, 2013 8:49 am [quote="Bazman"]Hi building-expert, In regards to the fall, we raised the levels early, however we were informed to wait until the demolition and site-cut was complete to determine if the fall would be satisfactory for a gravity solution. In my view this is entirely unsatisfactory, it's designer's art and skill to make sure it all fits together properly. I don't get the logic of waiting for site cut when the floor levels are set at the design stage and you can work out drainage from the design levels (or do something about it). Observing planning regulations, site boundaries, building envelope, regulations and attention to levels and services are the most basic design skills. Your architect has them, why are they not applied? In any case, if there is a problem requiring engineering of the levels and drainage then it's your designer's job to solve it by consulting with appropriate professionals. Why should that now be your job is that not what they are paid for? In my view recipe should be written before cooking starts or else you might not like the dish. 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: Stormwater drainage issue due to fall of land 12Nov 11, 2013 11:26 am Bazman I informed the plumber about a charged solution, however he is very reluctant to put one in. He even made a comment that if I insisted, that he wouldn't sign off on it. When I quized him as to why, he said he was worried that if the pipes cracked or leaked, that it may affect the foundations. Part of the stormwater runs beneath the garage slab as well. Many plumbers use flimsy (and cheap) 90 mm stormwater pipe that have walls less than 2 mm thick. PVC stormwater pipe is not pressure rated. It is also manufactured with a percentage of reground PVC. One problem that occurs with this pipe is when a plumber is over generous with the solvent cement. Solvent cement melts the pipe surface and melds the two surfaces together. If excess solvent pools on a PVC surface after the pipes and fittings are pushed together, it can eat into the pipe or fitting and weaken it. The two surfaces joined must also be pre wiped with primer to clean the surfaces and remove the glaze from the pipes and fittings before applying solvent cement to both surfaces. Even if the pipes are properly joined, I would never recommend running PVC stormwater pipe under a slab. It is simply not worth the risk. I also don't recommend using PVC stormwater pipe for rainwater tank wet systems. DWV (Drain Waste Vent) PVC pipe is thicker and uses a lower percentage of reground material. DWV fittings are also thicker and stronger. If DWV pipe is used, then there should be no issues with burying it under a slab. Many houses are built with DWV (and stormwater) pipes buried under the slab. I am wondering if the plumber was thinking of using stormwater pipe! A 1 metre head of water exerts a pressure of 9.8 kPa. Many people, including some plumbers, confuse the weight of water with the pressure exerted in a charged system. If you have a charged system, it will not be subject to much pressure. Maybe the plumber thinks that the downpipes will be full of water every time it rains! That just won't happen as a .5 metre head would be more than sufficient. A 100 mm PVC DWV pipe has an internal diameter (ID) of 104 mm. When doing pipe length friction loss calculations, the additional friction losses caused by the fittings must be added to the pipe length as an additional measure of pipe length. A (nominal ID) 100 mm DWV PVC pipe with a calculated friction loss length of 50 metres that is subjected to a .5 metre head will flow at over 500 lpm. As per my earlier reference to AS 2200 for surface drainage systems when laid at 1:100, PVC DN 100 shall not carry more than 450 L/min and PVC DN 90 shall not carry more than 360 L/min. Any possible leakage will not be a result of hydraulic pressure. If you don't have a charged system , then you are restricted to using a very expensive pumped system (that also necessitates having a detention system). This will use PVC pressure pipe. PVC pressure pipes and PVC DWV pipes are made from the same material except that pressure pipe does not have regrind added during manufacture. In Victoria, new homes are required to have either a solar HWS or a 2,000 litre RWT connected to sanitary flushing. Just about everyone gets ripped off with new home RWT installs but I can advise on the best and most cost effective way to have this done. You could satisfy both requirements by having a detention tank with a minimum 2,000 litres retention and this could be sited anywhere. Bazman Secondly, if I had driveway grate and agi piping going into the stormwater, would this cause any issues on a sealed/charge stormwater solution. SaveH2O Also note that charged drainage systems cannot facilitate surface drainage. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. 13 6602 Thank you Splashers. Tomorrow I might check if I can get a few packs of 300x300 in the same tile finish. It may be good to use these could in the shower recesses. I'm not… 4 4671 I've got a challenge here. Background is the builder has cut too deep for the slab and the slab is now below the very substantial retaining wall. It's failed occupancy… 0 18373 |