Browse Forums General Discussion Re: Drainage Point in a Charged System 2Jan 25, 2021 10:57 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: Drainage Point in a Charged System 4Jan 26, 2021 2:48 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: Drainage Point in a Charged System 6Jan 26, 2021 8:56 pm Lisa06 What do you mean by non-turbulent sections? Which sections of a wet system pipe are non-turbulent? Water flow is either laminar or turbulent. Water entering a wet system from a downpipe creates turbulence because of the two different flow paths colliding. An elbow creates turbulence due to induced boundary layer velocity variance causing eddies and vortices to form. It is best to fit a sediment trap 4-5 metres past the last area of turbulence. Lisa06 I read in one of your links that you can only reduce the pipe size if you have leaf diverters fitted. We don’t actually have them fitted (we are the second owners and they were never installed) and there is no room to actually fit them (not enough head). So does that mean we can’t fit a sediment trap? Just use a discharge pipe size that will pass an object that will fit down the downpipe. The object could be a kid's toy or anything. The pipe needn't be very long and there will be plenty of water in the downpipes and riser to provide an adequate flushing head. Lisa06 Also, what exactly is a purge valve? Is it different to a sliding gate valve? Any suitable outlet valve will do. Names vary throughout Australia. Lisa06 The sediment trap picture you shared doesn’t have a drainage pit, and I understand you said that it would flood quickly so it’s not the best idea. If that's the case, then how will it be possible to drain the charged system (if it's necessary)? It is buried. the valve is on the end of the pipe. Lisa06 … if the overflow mesh on a water tank is removed, can the overflow be connected directly to the LPOD without installation of an airgap? Is an airgap a regulatory requirement or just best practice? The overflow pipe should be meshed either at the outlet (inefficient) or with the air gap product or similar fitting. The mesh is to prevent pests like rats and frogs from entering the tank. Rainwater tank regulations have never been adequately written and there are also health regulations to abide by but which are inadequately publicised. Councils also put in their 2 cents at times and often they are not worth even that. The regulations are a hodgepodge of inadequacy, misinformation and localised variables of often questionable value. I think that QLD mandates the use of an air gap to protect the tank water from surcharge should the stormwater system become overloaded. I don't know offhand whether you would be required to have the overflow pipe meshed but I recommend that you do. 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: Drainage Point in a Charged System 7Jan 29, 2021 1:38 pm SaveH2O Lisa06 What do you mean by non-turbulent sections? Which sections of a wet system pipe are non-turbulent? Water flow is either laminar or turbulent. Water entering a wet system from a downpipe creates turbulence because of the two different flow paths colliding. An elbow creates turbulence due to induced boundary layer velocity variance causing eddies and vortices to form. It is best to fit a sediment trap 4-5 metres past the last area of turbulence. Lisa06 I read in one of your links that you can only reduce the pipe size if you have leaf diverters fitted. We don’t actually have them fitted (we are the second owners and they were never installed) and there is no room to actually fit them (not enough head). So does that mean we can’t fit a sediment trap? Just use a discharge pipe size that will pass an object that will fit down the downpipe. The object could be a kid's toy or anything. The pipe needn't be very long and there will be plenty of water in the downpipes and riser to provide an adequate flushing head. Lisa06 Also, what exactly is a purge valve? Is it different to a sliding gate valve? Any suitable outlet valve will do. Names vary throughout Australia. Lisa06 The sediment trap picture you shared doesn’t have a drainage pit, and I understand you said that it would flood quickly so it’s not the best idea. If that's the case, then how will it be possible to drain the charged system (if it's necessary)? It is buried. the valve is on the end of the pipe. Lisa06 … if the overflow mesh on a water tank is removed, can the overflow be connected directly to the LPOD without installation of an airgap? Is an airgap a regulatory requirement or just best practice? The overflow pipe should be meshed either at the outlet (inefficient) or with the air gap product or similar fitting. The mesh is to prevent pests like rats and frogs from entering the tank. Rainwater tank regulations have never been adequately written and there are also health regulations to abide by but which are inadequately publicised. Councils also put in their 2 cents at times and often they are not worth even that. The regulations are a hodgepodge of inadequacy, misinformation and localised variables of often questionable value. I think that QLD mandates the use of an air gap to protect the tank water from surcharge should the stormwater system become overloaded. I don't know offhand whether you would be required to have the overflow pipe meshed but I recommend that you do. Thank you for your very clear explanations. They make perfect sense and are very helpful. Re: Drainage Point in a Charged System 9Nov 07, 2021 1:02 pm Lisa06 @SaveH2O I have another question for you, please... The pipe from the tank overflow to the LPOD (which will be approx 30m in length) -does it need to have bedding (ie. crushed rock) underneath it like the stormwater pipes do? Thanks. Just saw this query. Better late than never to reply I guess. The pipe between the tank's overflow outlet and the LPOD is part of the stormwater system and those regulations apply. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Once you know the basics, the rest is easy. Read my post in the thread linked below. viewtopic.php?p=1919271#p1919271 2 19521 2 2531 Building Standards; Getting It Right! Hi All, We have a fall from road to garage front. But we cannot put a drain/grate because no discharge point put by the builder. Now they complain not enough space for… 0 9245 |