Browse Forums Building A New House Re: Drainage and water tank head of water 4Sep 15, 2012 1:26 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 and water tank head of water 7Sep 15, 2012 10:51 pm Your rainwater harvesting system is a typical install but it is also most probably not compliant. It will cause some serious issues down the track. Without knowing the total roof area harvested by the three downpipes, l can still make an educated guess and say that the overflow is unlikely to have the capacity to prevent the tank overflowing during medium-heavy rain. If so, the roof area harvested exceeds compliance for the overflow pipe size. There do not appear to be any mosquito proof leaf diverters fitted to the two wet downpipes as required. If the buried pipe is 90 mm UPVC, it should not have been buried. This is also typical. The buried horizontal pipe will eventually block and trapped debris could also cause stagnation. From the photos, l cannot see any IO's and this should be investigated. If there are not at least two, it is not compliant. From the photos, it appears that the height of the two 100 X 50 X 90 mm downpipe adaptors that convert the 100 X 50 mm rectangular downpipe to 90 mm round is not much higher than the infeed pipe that enters the tank. From this, l am assuming that the rectangular downpipe is either PVC or a metal downpipe that has been subjected to plenty of silicone. Nevertheless, the adaptor has probably been sealed so that the downpipe will still provide sufficient head when the tank is full without water spilling from the adaptor. If this is the case, then the downpipe could fill if the flow through the horizontal pipe became restricted. This would be a potential problem in that the water would then overflow from a fair height. It would be best to check and see if the adaptors have been sealed given the other concerns with the horizontal wet pipe. You will have to monitor the sediment build up in the tank. I cannot judge from the photos the height of the tank outlet that feeds the pump but if it is close to the bottom, it could draw sediment through the pump. This will not only block any filters you may later install, it can also damage the pump through a condition known as erosion corrosion. Note that a poorly positioned tank outlet is not a compliance issue but it is a common and amateurish mistake. I would also like to see a photo of the connection from the tank to where it connects to the pump. Have a read of this Vic. PIC Technical Solution Sheet. http://www.pic.vic.gov.au/resources/doc ... _tanks.pdf 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 and water tank head of water 8Sep 15, 2012 11:37 pm Thank-you so much for your advise. Seeing the builder left in dispute I now have to fix many things that the inspection report found defective. I live in Melb, Glen Eira if that helps. I will send better photos. I am so upset Collingwood won. I hate em! Re: Drainage and water tank head of water 9Sep 16, 2012 12:57 am He may not have fitted leaf diverters (also eroneously known as rain heads) due to aesthetic reasons but you really do need them. Apart from anything else, they stop mosquitoes accessing the water and breeding. For an easy fix, l think that l would fit a sediment trap to the buried horizontal pipe. I have described it in my second post on this linked thread... viewtopic.php?f=35&t=59393 The 90 mm pipe is easily adapted to 100 mm by using a 100 mm F + F coupling and a 100-90 mm reducer socket. You should really do away with the 90 mm UPVC pipe but it is there and you may as well continue to use it. IOs are mandatory but next to useless with buried pipes and l would rather have the sediment trap in any case. The third downpipe can be retained as it can be replumbed so that it has its own filter and overflow, that way the tank's overflow would only service the excess inflow from the other two downpipes. I cannot mention how this is done on the forum. By making some simple changes, the water would be very clean and potential overflow problems could possibly be eliminated. You are not far from me but l don't do plumbing, just advise. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. If you can calculate the reasonable charged head from let's say 100mm below the gutter to the top of where the vertical riser's horizontal discharge pipe will be, that… 11 17847 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 7152 Building Standards; Getting It Right! Thank you for the generous offer. I need to get the plumber out to give me an explanation. As mentioned I haven't seen any rain water discharge from pipes 1& 3. It… 7 11179 |