Browse Forums General Discussion Re: Wet/Charged Stormwater 2Feb 05, 2021 11:14 pm Most councils don't allow charged pipes to flow to the kerb, so you'd require a pit at your boundary, and then a pipe at 1% to the kerb. You will have the charged line running to this pit. Which council do you fall under ? Speaking for NSW. Need 500-600mm of head for adequate pressure above the outlet of charged line. This can be checked by deducting IL of charged line at pit from Eaves/ceiling RL. If you have a survey/site plan or other plans I can check if this will work for you. Re: Wet/Charged Stormwater 3Feb 06, 2021 6:47 am Hi moudzj, Thanks for the rely. I am in the Moreton Bay region in Queensland. I don’t have a site survey or plan with contours on it unfortunately. The plans I have do not have country markings. I wonder about going charged into a water tank then if the tank was towards the front of the property, it would not require a charged overflow from the tank to the street as it would be a dry line. Lindsay Re: Wet/Charged Stormwater 4Feb 06, 2021 8:56 am moudzj Most councils don't allow charged pipes to flow to the kerb, so you'd require a pit at your boundary, and then a pipe at 1% to the kerb. You will have the charged line running to this pit. This is assuming that the outlet at the bottom of the pit is higher than the kerb. If it isn't, then the pit will retain water which will reduce both it's effective storage and drainage capacity. The pit would need to be large to handle charged water coming off an entire house roof and the roof area hasn't even been stated. moudzj Need 500-600mm of head for adequate pressure above the outlet of charged line. This can be checked by deducting IL of charged line at pit from Eaves/ceiling RL. Calculations are made once the rainwater volume, the pipe size and pipe length are known but 500-600mm head is an excessive requirement. A suitable pit at the front of the property as described may not attain critical submergence to generate full flow. 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: Wet/Charged Stormwater 5Feb 06, 2021 9:33 am lindsayr I am in the Moreton Bay region in Queensland. What is the roof area? lindsayr I wonder about going charged into a water tank then if the tank was towards the front of the property, it would not require a charged overflow from the tank to the street as it would be a dry line. Either a detention or a retention/detention tank is your best solution. The first thing you need to do is check the council policy and make sure you also know the Permissible Site Discharge (PSD) if applicable. The PSD is the tank's maximum allowed discharge flow rate, the whole point of using a detention tank. A detention/retention tank has a small overflow outlet about half way up the side of the tank but also a larger outlet at the top in case the tank should fill. A detention tank has the small outlet closer to the bottom, this allows the tank to be smaller than a retention/detention tank and may be more suited to your location. Of course, if you have the space to fit a large tank and you can use the harvested water, the retention/detention option may be more suited to your needs. The tank below shows a southern State retention/detention tank. The detention compartment would be too small for your location unless you had a very small roof area but the overflow plumbing visuals the concept. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ 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: Wet/Charged Stormwater 6Feb 06, 2021 10:01 am Thanks SaveH2O. I think it will take most of around a 50sqm roof area. It is for an extension in the front of an existing house. The existing roof goes into 2 tanks and overflows to an old rubble pit. I was hoping to avoid building a new rubble pit but it might be the best option. I had thought about a tank in the front but unfortunately we do not have the space to keep the front setback. Lindsay Re: Wet/Charged Stormwater 7Feb 06, 2021 11:16 am I had assumed a larger roof area which is why one needs to always check. A lot of councils are now against having rubble pits, have you checked your council's current policy? 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: Wet/Charged Stormwater 8Feb 06, 2021 11:17 am It appears to suggest rubble pit for our situation... https://www.moretonbay.qld.gov.au/files ... -sheet.pdf Lindsay Re: Wet/Charged Stormwater 9Feb 06, 2021 11:21 am Yes, I agree. 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: Wet/Charged Stormwater 11Feb 06, 2021 1:37 pm First thing to do is to find out whether you can submit a plan for a detention tank system. Given the small roof area, you could be lucky. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Once you know the basics, the rest is easy. Read my post in the thread linked below. viewtopic.php?p=1919271#p1919271 2 19496 All sorted guys. Just needed to buy a blade with the correct bush. Dunno how to delete this post, can't find any help file. Cheers. 1 3657 Plumbers 'can be' plumbers, made all the worse by self certification which the building surveyor invariably accepts as proof of compliance! The good thing is that you know know. 3 4835 |