Browse Forums Eco Living Re: Rainwater tank connection conundrum 2May 26, 2013 4:43 pm The Harder You Try - the Luckier You Get ! Web site http://www.anewhouse.com.au Informative, Amusing, and Opinionated Blog - Over 600 posts on all aspects of building a new house. Re: Rainwater tank connection conundrum 4May 26, 2013 5:46 pm The Harder You Try - the Luckier You Get ! Web site http://www.anewhouse.com.au Informative, Amusing, and Opinionated Blog - Over 600 posts on all aspects of building a new house. Re: Rainwater tank connection conundrum 5May 26, 2013 6:19 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: Rainwater tank connection conundrum 7May 27, 2013 12:10 pm Thanks for the info. I had it picked as S.A. with W.A. the second choice. The 74 sq m roof area will collect 172 lpm during a 1:20 ARI. I always design for a 1:20 ARI plus an allowance but this is not regulated (although it should be). The (blue dot) spreader will divert a reasonable amount of additional water to the harvested roof area as it is between the roof valley and the (yellow dot) downpipe at the corner near where the tanks are going. The downpipe is the low point and the valley will (or should) be draining to the Gutter's high point. The water from the valley will drain freely to the patio roof spreader as the second (yellow) downpipe on the opposite side of the house is 9 metres away from the valley and there is also a corner that adds resistance to the flow. It’s a bit hard to work out just how much extra water it would divert to the patio roof during a 1:20 ARI but I am guesstimating about 30 lpm (202 lpm in total). However, other flow calculations show that the slotted gutter will overflow through the slots prior to a 1:20 ARI and so the flow to the tank(s) would be less than 202 lpm. The bottom of the 100 mm horizontal pipe running under the patio gutter appears to be about 2.2 metres high. Unfortunately, the 5,000 litre tank being considered is 2.16 m high and you need head pressure. This means one of two things... 1.) You need a shorter tank. 2.) You could partially bury a poly tank. I often part bury a poly tank in a compacted sand base but I generally only go down 80 mm because of the valves. You would need to go down more than this plus it also means having a submersible pump. You first need to work out the respective levels before you do anything else. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. 18 90413 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 31235 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 31111 |