Browse Forums General Discussion Re: Low head water tank 2Jul 16, 2023 11:32 pm 3in1 Supadiverta. Rainwater Harvesting Best Practice using siphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost, siphonic, eaves gutter overflow solution. Re: Low head water tank 4Jul 17, 2023 11:09 am 3in1 Supadiverta. Rainwater Harvesting Best Practice using siphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost, siphonic, eaves gutter overflow solution. Re: Low head water tank 6Jul 17, 2023 7:41 pm 3in1 Supadiverta. Rainwater Harvesting Best Practice using siphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost, siphonic, eaves gutter overflow solution. Re: Low head water tank 8Jul 18, 2023 9:24 pm 3in1 Supadiverta. Rainwater Harvesting Best Practice using siphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost, siphonic, eaves gutter overflow solution. Re: Low head water tank 10Jul 20, 2023 12:14 am 3in1 Supadiverta. Rainwater Harvesting Best Practice using siphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost, siphonic, eaves gutter overflow solution. Re: Low head water tank 12Jul 23, 2023 10:06 pm If you can calculate the reasonable head from let's say 100mm below the gutter to the top of where the vertical riser's horizontal discharge pipe will be, that would be good. Can you get hold of a laser level? Many tradies have them now as small ones are so cheap. Line of sight using a straight edge with a level works for me. You will most probably need to upsize the horizontal pipes to 150mm before the last one or even two downpipes on each run (depending on roof areas harvested and allowing for wind driven rain) even if you install some meshed side inlets on the tank because you really need to allow for that really big high intensity rain event that sooner or later you will have. Designing for a bare minimum 1:20 ARI just doesn't cut it. The overflow pipe also needs to be upgraded if you are planning on having just one. The immediate move would be to remove the flow restricting overflow mesh and fit an air gap on the outside vertical pipe. An air gap has two easily serviced mesh filters, see link below. There is a video at the bottom of the linked page. https://rainharvesting.com.au/products/ ... s/air-gap/ To increase the overflow outlet's overflow capacity, you can also securely solvent weld a pipe about 150mm long to the overflow fitting inside the tank but drill holes (about 32mm) all over the pipe (but not too close together) to increase the total weir wall length. This will substantially increase the discharge capacity. NOTE: This must never be done if using flimsy 90mm pvc stormwater pipe! I recommend you having two 100mm overflow pipes on the infeed (settling) tank. 150mm overflow outlets are also available. There is an online charged pipe flow calculator that you can consult re wet system pipe sizes and their lengths Vs different hydraulic heads. It also has a link to a You Tube instruction video on how to use the calculator. It would be very handy if you could calculate and write the volume of water flowing along each section of pipe during a 1:20 ARI but again, allow for a greater rain intensity event. https://www.roof-gutter-design.com.au/C ... dPipes.php The measures can all be done as a straight line with the calculator because a house corner is simply represented by a 90 degree elbow that is factored by the calculator as being an equivalent length of pipe added to the total length. 3in1 Supadiverta. Rainwater Harvesting Best Practice using siphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost, siphonic, eaves gutter overflow solution. 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 13678 Can a plumber put a tap on a rain water tank which is full? Tank is similar to one in photo. Cheers. 0 3578 You just need the gutter and downpipe sizes to be compliant with the NCC for the roof area harvested and have the downpipes connected to a LPOD. You need to ask your… 1 11858 |