Browse Forums Building Standards; Getting It Right! Re: Poorly plumbed rainwater tank 2Dec 03, 2021 11:30 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: Poorly plumbed rainwater tank 4Dec 06, 2021 4:25 pm keyman I've read your reply a few times and if I'm understanding it correctly, I should be ok making the following changes:
keyman Unfortunately as you have correctly surmised, the documentation from the tank manufacturer is lacking. The lack of critical information is common place and a blight on the industry. keyman In regards to the build up of silt from slow flow - I've also seen a diagram on this forum of a DIY sediment trap. I'm assuming this is not possible for my current scenario as the concrete apron has already been installed? Unfortunately yes and a common problem. Roof drainage regulations end at the downpipe and stormwater pipe regulations do not apply to rainwater harvesting diversion pipes.between the downpipe and the tank, only from the overflow pipe to the LPOD. This is something that few understand. Having large pipes all along a wet system is crazy as they have no flushing velocity at the head of the system. The only time these pipes flush sediment is after the pipes have build up so much sediment that the flow restriction generates turbulence. If organic matter also accumulates, bacterial die off often combines with the sludge to create a resinous black gooey tar like substance that won't flush. This can take many years to build up though. keyman This is what I was afraid especially because I'm on reactive clay soil. Can this be remedied by creating another overflow outlet lower down and joining it with a T section to the existing overflow? I've also seen some of your previous posts recommeding using a bellmouth inside the tank but I'm not sure how this can be achieved... Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ I believe that the overflow is more efficient than normal by virtue of the nearby sealed inlet restrictting a vortex forming. I suggest as a first step you phone Yarra Plastics and ask what the tank's overflow capacity is with a meshed 100mm overflow and the nearest top inlet sealed. If they don't know and I would be more than shocked if they did, they should do a long overdue flow test and you should ask for this. It is important to have this information before planning the next step. Also ask where the best place to fit an additional overflow pipe is. These tanks often have different requirements and you don't want to risk voiding the warranty. Fitting an air gap to the vertical overflow pipe and removing the overflow outlet's mesh will increase the overflow capacity about 20%. A bellmouth fitted to a vertical drain pipe will dramatically improve the flow capacity but there has to be a suitable storage height above the pipe's crest. I get regular enquiries about tanks overtopping and some of those have had high level overflow elbows fitted inside the tank. It is becoming an increasingly common issue. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Building Standards; Getting It Right! Hi all, My neighbour has built his 15m long garage on our boundary. It was agreed as part of the planning permit that the wall must be in exposed recycled brick. For some… 0 10916 DIY, Home Maintenance & Repair But if it is a ground level open pit, then it is not a charged system. No surprises there. The pipes have obviously been altered and there would be a reason for this.… 3 31284 Grate, thank you! RexChan if thats the reason i could sleep well without thinking about additional cost. But 1st i'll need to read about NRV cleaning/replaing stuff. I… 7 31167 |