Browse Forums Building Standards; Getting It Right! Re: Correct Roof Drainage Design Issues AS3500 vs HB35 2Sep 22, 2016 2:57 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: Correct Roof Drainage Design Issues AS3500 vs HB35 4Sep 24, 2016 3:23 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: Correct Roof Drainage Design Issues AS3500 vs HB35 6Sep 27, 2016 2:59 am 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: Correct Roof Drainage Design Issues AS3500 vs HB35 8Sep 28, 2016 2:03 am 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: Correct Roof Drainage Design Issues AS3500 vs HB35 10Sep 28, 2016 11:38 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: Correct Roof Drainage Design Issues AS3500 vs HB35 11Sep 29, 2016 8:21 am Thank you H20, you have cleared up alot of confusion and saved me and my family alot of heart ache. If I understand correctly regarding your comments on weir flow, you do not think it is worth spending the extra for the Tornado rain head? Should we just run with standard connection detail between the half round gutter and the downpipe ? Re: Correct Roof Drainage Design Issues AS3500 vs HB35 12Sep 29, 2016 4:17 pm jarunit If I understand correctly regarding your comments on weir flow, you do not think it is worth spending the extra for the Tornado rain head? Should we just run with standard connection detail between the half round gutter and the downpipe ? The Tornado rain head is manufactured in Australia by an Australian company, I also manufacture in Australia and I support other Australian companies who also manufacturer quality products in Australia. When I offer advice on forums, I don't recommend against a product that I might think is not needed for a particular situation in case a recommendation is interpreted as a criticism of the product itself, what I try to do is give information that will allow the reader to understand the dynamics so they can make an informed decision. I don't think that the Tornado rain head can be fitted to a half round gutter but you are best to contact the manufacturer and ask them for that information. I have checked and confirmed that half round gutters can be fitted with 100mm downpipes. The flow characteristics of a half round gutter combined with a 100mm downpipe will give superb flushing and a more than adequate drainage capacity for your straight gutters. It must be remembered that the 100mm downpipe's pop/outlet services the half round gutter's entire sole and extends up the walls. The half round gutter flows with a greater velocity in comparison to other gutters. The greater velocity and the outlet/pop's characteristics also increases the downpipe's drainage capacity due to the generated turbulence entraining air at the top of the downpipe. The Tornado rain head's larger surface interface increases the initial drainage capacity but it also significantly increases the smaller downpipe's flow capacity due to the turbulence also entraining air which induces bubble flow as previously explained. The vortex does not cause the gutter to drain faster, the gutter drains by a combination of design, slope and the size of the gutter's outlet/pop/rainhead. Reducing the vortex significantly increases the downpipe's flow capacity by allowing the downpipe to fill with more water which also flows with greater velocity due to minor head pressure being generated during bubble flow. You will see this in the Tornado rain head video. The 100mm downpipe for your gutter will also be subjected to some turbulence during heavy rain but it won't need this 'assistance' to cope. The downpipe outlet/pop should be fitted to the gutter's underside so as to eliminate the ridge that is made when the pop is fitted inside the gutter. Decaying organic matter is negatively charged and this will rust metal gutters, it is best to eliminate any possibility of sediments accumulating. Rain Harvesting Pty Lty is an Australian company that makes a 100mm uPVC outlet/pop for half round gutters and it is widely available. The part number is GSG006. A little off topic but for some other applications, the vortex can be eliminated by fitting an anti vortex baffle above the pipe to block the vortex once the water level rises above the baffle. Once the vortex is eliminated and the pipe purged of air, the water will flow vertically (not spiral) under head pressure at high velocities that generate sub atmospheric pressures. The negative pressures are greatest at the top of the pipe and the negative pressure literally sucks water into the pipe. Negative pressures can however cause pipes to buckle asymmetrically and so fit for purpose pipes must be used. The method is called syphonic (also siphonic) drainage and it is used on virtually all large roofs world wide. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Need more photos from around the house including your gutters. We have had 3 of the wettest years in a row for some time so that wouldn't be helping 3 6946 Hi there everyone i was hoping to get some details and some clarification on some potential defects that may have occurred our recent bathroom renovation. 1. There seems… 0 6968 Building Standards; Getting It Right! It's all good. You can get both wye piece and the coupling with or without thread. The cost difference is negligible and means the plumber only has to carry the single… 1 4916 |