Browse Forums Landscape & Garden Design Re: Using tank overflow for drip irrigation 8Aug 07, 2012 7:47 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: Using tank overflow for drip irrigation 10Aug 07, 2012 8:03 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: Using tank overflow for drip irrigation 12Aug 07, 2012 8:29 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: Using tank overflow for drip irrigation 14Aug 07, 2012 9:31 pm That is an interesting situation. I assume the gutter's roof harvest area is not big, otherwise a 50 mm overflow would not cope during heavy rain. Have you got a downpipe that you could divert the overflow back to? Downpipes have a lot of capacity to take additional water fed in at the bottom as downpipes carry a lot more air than water. A 50 mm charged pipe can generate a high flow rate and diverting the overflow even 30 metres with a 1 metre head will provide an unneeded potential flow rate of around 200 lpm. You could use 32 mm LDPE, depending on the required maximum flow rate. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Using tank overflow for drip irrigation 15Aug 07, 2012 10:52 pm That's the main issue in that I don't have a downpipe nearby. I'll divert it to one further away but it's just a logistical problem. By the way the roof area is 25m^2 and it collects via a 65mm pipe into a tank with a 50mm overflow that goes nowhere. Kind of strange but that's the way it was when we moved in. Re: Using tank overflow for drip irrigation 16Aug 08, 2012 12:08 am It would take 160 mm of rain on the roof to fill all 4 tanks and this leads me to ask what you use the harvested water for. If the tanks over filling in winter is a problem, maybe just slowly drain some off during dry periods for mitigation as it sounds like playing around with an overflow pipe will be messy. Melbourne has been wet until last month and La Nina officially finished a couple of months ago. The prediction for a return to El Nino is about 70%. 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: Using tank overflow for drip irrigation 17Aug 08, 2012 1:16 pm I'll be running irrigation for new buffalo turf that will be installed in spring and have a reasonably large veggie area. Of course over the last couple of years even a 1000 litre thank would have been enough. Re: Using tank overflow for drip irrigation 18Aug 16, 2012 11:34 pm The last couple of years have been La Niña years. When the dry El Niño returns it will bring the dry again and that means available tank water maybe compromised in summer. Re: Using tank overflow for drip irrigation 19Jun 21, 2023 9:20 am SaveH2O The drip line would need to have the same discharge capacity as the overflow pipe's maximum flow during heavy rain. At all other times, the discharge would not be evenly distributed. There are devices available that substitute as the tank's overflow when the tank fills, eliminating the need for a tank overflow. Hi SaveH2O, I realise this is an old thread but I have a related question please. We purchased a small water tank (2500L) for our animal barn (roof = 26m2). Water from the roof enters the tank via a 90mm pvc pipe. It currently has no overflow pipe and I need to remedy that asap as the overflowing water is ruining the tank foundation. The overflow outlet is 90mm but I was thinking of reducing that to a 50mm pipe and then running the pipe into a hedge 6m away. We’re actually thinking we’ll use about 6m of 50mm pvc and then connect it to a smaller poly pipe with holes in it. We’re not fussed if the water doesn’t travel far, we just don’t want it to fall around the tank. Do you think a 50mm overflow pipe would be sufficient in size to prevent the tank overflowing from the inlet? I would prefer to use a 50mm pipe (as opposed to a 90mm pipe) if possible as we’d like to partially bury the pipe, which will be easier to do with a small pipe. We can’t fully bury it unfortunately as there isn’t fall to the hedge. TIA Re: Using tank overflow for drip irrigation 20Jun 21, 2023 12:46 pm You would need to convert the 90mm pvc stormwater pipe to pvc DWV pipe because (DN) 90mm pvc stormwater pipe is the smallest size. Doing this is easy as you only need to buy a 100x90mm stormwater adapter and a 100 x 50mm DWV invert taper. 1. Buy and fit a meshed 90mm overflow outlet. 2. Buy and fit a 90mm pvc stormwater 90 degree M + F elbow. Fit the M end into the meshed outlet's socket. 3. Fit a short 90mm pvc stormwater pipe (sleeve) between the elbow's female end and the stormwater adapter's female end. 4. Fit the invert taper's largest end over the stormwater adapter. 5. Fit a 50mm DWV pipe to the invert taper. Disregard the above advice, Lisa06 has found a simple fitting that I was unaware of. See her next post. The DWV pipe is much stronger than a 90mm pvc stormwater pipe.and it won't have any problems with the flow due to the vertical riser providing head pressure should water in the pipe ever back up. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Much a do about nothing. You can see the fall heading to the actual drains. 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