Browse Forums Building Standards; Getting It Right! Re: Storm water 2Oct 17, 2018 6:08 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: Storm water 5Oct 27, 2018 11:37 am 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: Storm water 7Oct 27, 2018 12:24 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: Storm water 11Oct 27, 2018 4:00 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: Storm water 14Oct 27, 2018 6:45 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: Storm water 16Oct 27, 2018 8:04 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: Storm water 20Oct 28, 2018 3:38 pm They are clueless and this ain't rocket science. Does it say who did the stormwater plan? I have also assumed that the subsurface pipes are 90mm, I would have recommended 100mm DWV with regard to the pipe capacity and the soil classification. A 90mm pvc SN2 stormwater pipe has an internal diameter of 86.2 mm which gives a volume of 5.84 litres per metre and a velocity of 1 metre per second gives 350 litres per minute. If the pipes used are 90mm pvc stormwater, the velocity of water from your roof through a single pipe during a 1:20 ARI would exceed 3 metres per second!!! At this velocity, the pipe would be operating under sub atmospheric pressure. A 100mm DWV pvc pipe has an internal diameter of 104mm which gives a volume of 8.5 litres per metre and a flow rate of 510 litres per minute at a velocity of 1 metre per second. Draining your roof during a 1:20 ARI would require the velocity to exceed 2 metres per second. AS/NZS 3500.3 5.4.11.2 Design Procedure states..... "The general method for designing a pipe drain for a stormwater drain shall be as follows: (In part) ..."the full-pipe velocity in the outlet pipe is recommended not to exceed 1.5 m/s and shall not exceed 2.0 m/s." Regardless, it is a moot point because there is no way that a water tank's 90mm meshed overflow orifice will discharge at anywhere near the required volume which is nearly 18 litres per second to prevent the tank overtopping! 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Hello I am developing 2 side by side units. Wish someone can help me on the following questions 1) Which stage should be the storm water pipe installed during the new… 0 7834 If you need to be able to access these then you may need to dig them out and cut them so you can add a socket and a riser to the required height. We normally add a… 1 6857 Thanks for that, the PVC pipe is still about 40cm below ground level and it sticks out of the sand with no end cap or anything on it just open pipe, is this the finished… 2 10484 |