Browse Forums General Discussion 1 Jun 24, 2015 1:03 pm Hoping this is the right place to post. We spoke to council this morning about stormwater solutions. Our block runs away from the street- a 2m fall from front to back over 50m block (800mm over the build area, and roughly 1.2m from curb to back of house). We were considering charged lines to the street, however the Duty Officer suggested that they require ongoing maintenance, and that if anything goes wrong, they can back up and we can be left with water running from the street into our pipes. The other option for CDC is that we include some kind of pit/inter-allotment drainage system on the block. Our tender has allowed for a 6m x 1.2m pit. The hydraulics engineer is yet to view this however. Has anyone got any insight into charged systems and whether they are really problematic? M Y C U S T O M C O R A L B R O N T E 43 ...............Kitchen! 16 Nov 2016 https://forum.homeone.com.au/viewtopic.php?f=31&t=79581 Re: Stormwater and charged lines 2Jun 24, 2015 1:25 pm I've had a few clients like you over the years that had negative fall to the street and having a charged system was the only solution. Some councils like most of our local ones refuse to allow for any kind of electric pump-out system for various reasons mostly because they rightly say that the biggest problem is that in the heaviest of downpours is usually when the power goes off rendering an electric pump useless.
One thing I told the clients to do is make sure the plumbers had a few IO's ( inspection openings ) so if there were problems rodding access would be easy. As far as I know none of the ones I mention above has not had any issues. I guess like anything, a bit of regular maintenance goes a long way. In this case popping the IO covers and giving the pipes a good sluice out with a hose turned on full every 6 months or so would be a good idea. Stewie Re: Stormwater and charged lines 3Jun 24, 2015 1:25 pm The issue with charged lines is if they silt up. There are a couple of ways around keeping the sediment out of the line: 1, Take all the roof water into a rainwater collection and discharge to the street via the tank overflow. (all the sediments will settle out in the tank. 2. Use first flush diverters at downpipes to send the solids into the first flush point where it can be easily removed. 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: Stormwater and charged lines 4Jun 24, 2015 1:46 pm Stewie D and Bashworth- you are both amazing. Thanks so much. We should all start paying you for your help! M Y C U S T O M C O R A L B R O N T E 43 ...............Kitchen! 16 Nov 2016 https://forum.homeone.com.au/viewtopic.php?f=31&t=79581 Re: Stormwater and charged lines 5Jun 24, 2015 2:16 pm MrsJM Hoping this is the right place to post. The forum doesn't have a plumbing sub forum...or any plumbers for that matter! You should ask a moderator to move the thread to General Discussion. MrsJM Our block runs away from the street- a 2m fall from front to back over 50m block (800mm over the build area, and roughly 1.2m from curb to back of house). You have plenty of head to run charged. MrsJM We were considering charged lines to the street, however the Duty Officer suggested that they require ongoing maintenance, and that if anything goes wrong, they can back up and we can be left with water running from the street into our pipes. The uphill gradient will almost certainly mean that the flow of water will lack an adequate velocity to flush sediment from the pipe, however, there are some simple precautions that you can take. 1. Having surplus head allows you to fit leaf diverters to the downpipes at a height that will give easy maintenance access. Fitting leaf diverters will provide two benefits. a) There will be an air gap that allows the gutter to still drain in the event of a blockage in the charged pipe. If the charged pipe were to block for whatever reason, the house gutters would fill. b) They prevent larger debris from entering the charged pipe throughout the entire rain event. Most leaf diverters use .955 mm (955 micron) wire mesh. My company is prototyping a new type of leaf diverter that will have either 500 or 600 micron filtration but it won't be available for possibly another 6 months at this stage. The finer filtration provides more efficient flushing of smaller (and lighter) particulates in situations such as you will have. You should also fit an extended pipe at the charged system's lowest point that is fitted with a flush valve. This will allow the pipe to be flushed out periodically, you only need to determine beforehand where you want the water to drain to. If the pipes are not flushed, they will remain full of water to the level at the bottom of the outlet. This provides a seal of sorts...water from the street will not run into the pipes unless the pipes have been flushed and the pipe's outlet is very close to the bottom of the gutter. In any case, if there is a lot of water flowing down the gutter, there will also be water entering the charged pipe from your roof and discharging from the pipe to the gutter. It is more than possible that the council has a limit as to the permissible site discharge (PSD). You need to check this and if this is the case, then you should consider having a detention tank overflow system installed. This would, in most instances, be preferable to having a 6m x 1.2m pit. The detention tank also allows you to connect rainwater to the cisterns. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Stormwater and charged lines 6Jun 30, 2015 6:09 pm Hi Mrs jm. We had this exact system designed for our build recently. We have the charged line downpipes connected to the tank toward the front, along with surface drainage into an absorption trench. Either way, it's going to move water out to the street gutter or downhill into the pit (or out the lowest sq Concrete pit ) It's based on requirements with parramatta council and their flood plain management plan. We actually got out of it cheaply considered others in the area have had to also use OSD Systems. No caveats on the land title, and was only slightly over on our sewer and stormwater PA contract items. Check out the blog if you'd like to see our hydraulic plan Edge39.my-letter-box.com Re: Stormwater and charged lines 7Jun 30, 2015 9:27 pm Lucky you. We are in prelim with our hydraulics engineer for an OSD in Warringah council and it looks like if we have our OSD in our backyard we will have to go through two neighbouring properties, crossing Sydney Waters main sewer ( meaning concrete encase the sewer ) and three retaining walls to get the stormwater drains to discharge to the street gutter. $$$$$$$$$$ even if I do a lot of the work. Stewie Re: Stormwater and charged lines 8Jul 01, 2015 1:48 pm Holy crap stewie. That's insane. I guess that means negotiation on easement access through these neighbours. Huge delays I bet Re: Stormwater and charged lines 9Jul 01, 2015 2:20 pm Had a house I built in 1997 that required a pump and despite regular maintenance it failed a couple of times in heavy rain causing garage to flood, I ended up getting an emergency pump as a backup which solved my problems as both times pump failed despite power been ok, I had both connected so at least one could still work if one failed. Re: Stormwater and charged lines 10Apr 21, 2022 5:16 pm I've also got a situation where my property drops back from the street. The council issued a Point of Discharge (LPD) notice being the street kerb at the front of the house. I can add capacity to my rain tanks in the backyard using them for my Onsite Water Detention (OSD) and then run a charged line from the OSD to the street kerb LPD. It would be a simple system and the heights are adequate, however the council has stated they wont allow a charged line, they also wont allow the water to be pumped to the LPD. The alternative they suggested is for me to build a new storm water drainage system running down a lane at the back of my house connecting to the street behind. It would cost me about $50k and the asset once built would be theirs... Lets assume I dont have that much money available, if I were to use the charged line - it will be a private line, any maintenance will not be their issue. My council is Moreland, they have no guidance published on using charged lines, I've googled and noticed several other councils (including the City of Melbourne) have information sheets discussing the use of charged storm water lines. My question is, I'm aware the council sign off or approve the civil design but do they have the authority to stop me using a charged line? Once you know the basics, the rest is easy. Read my post in the thread linked below. viewtopic.php?p=1919271#p1919271 2 19497 Grab a hose, insert it at the top of the inlet/down pipe and turn the water on and see where the water is escaping from. Then you'll know. 3 8458 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 4846 |