Browse Forums Building A New House 1 Oct 29, 2013 6:20 pm We've finally gotten our quote for our stormwater requirements and our sewerage connection from our builder and were bowled over with shock. $17,000 for storm water - on site detention $9,500 to connect our sewerage. The main line is on our side of the street. This seems phenomenally high to us! And has blown our budget out of the water to the point where we can't put what we want finish wise in the house. Are we being done on this? There's nothing special about our land except it being a knock down rebuild, less than a metre of fall, not difficult access and has already been cleared. Re: Sewerage and Stormwater Costs - too high? 2Oct 29, 2013 7:08 pm You need to post details to get a learned opinion. These 'extras' are gravy for the builders and others. The thread linked below should be of interest. viewtopic.php?p=1074030#p1074030 EDIT: The variation in the above link was $24,000. 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: Sewerage and Stormwater Costs - too high? 3Oct 29, 2013 7:56 pm As SaveH20 says its hard to comment without more details but as far as storm water detention systems go I have heard of costs of over $30,000. 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: Sewerage and Stormwater Costs - too high? 4Nov 28, 2013 10:09 pm Mmmmm... And i thought I was going mental. I also got a quote of $17.5k to connect to the storm water drain which is under the nature strip in front of our block. Knock down and rebuild as well. Surely this seems excessive..... Re: Sewerage and Stormwater Costs - too high? 5Nov 28, 2013 10:35 pm skm1 I also got a quote of $17.5k to connect to the storm water drain which is under the nature strip in front of our block. Knock down and rebuild as well. Surely this seems excessive..... I take it that you will have an onsite detention system for those $$$. It is impossible to comment further without knowing the details. Detention systems are either above or below ground. Above ground detention tanks are simple to hydraulically assess but most new home builders get gouged no matter what they have. You are at the builders mercy once your name is on the dotted line. 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: Sewerage and Stormwater Costs - too high? 6Nov 29, 2013 7:27 am bashworth As SaveH20 says its hard to comment without more details but as far as storm water detention systems go I have heard of costs of over $30,000. Yeah, this; a guy I know who's also in Ryde council (and who I think built under council rules rather than CDC) was made to put in a ~$30k stormwater detention system; and his is just a normal-sized higher-than-the-street-but-fairly-flat suburban block, not some sloping 1-acre rainwater-funnel or whatever. Now ours is going to be about $13k, but they've done something funky with the design so that the rainwater tank performs some of the function of the stormwater system. It overflows to a detention tank. It all made sense 6-odd months ago, and all I really remember from it was that they saved us some money by designing it all as part of one single system (ie. rather than having a rainwater tank AND a stormwater system being totally separate). Re: Sewerage and Stormwater Costs - too high? 7Nov 29, 2013 8:32 am Sorry haven't had time to dig up the variation and post details. Our on site detention is buried and we are also increasing the capacity of our rainwater tank which overflows into it. I'm more concerned about the sewerage connection cost being $9.5K. Our tender had an allowance of $2.5K and nothing has changed since then and they bumped the price up. It's not as if they have to dig up the road. Re: Sewerage and Stormwater Costs - too high? 8Nov 29, 2013 8:34 am Forg they've done something funky with the design so that the rainwater tank performs some of the function of the stormwater system. Detention tanks and the necessary hydraulic calculations are very, very simple. They have a limited sized overflow pipe maybe 2/3rds up the side of the tank, the pipe's size restricting the amount of water discharging to the stormwater. This small overflow pipe will discharge into a larger vertical pipe, typically via a 45 degree junction. Excess water entering the tank during heavy rain will slowly rise up the detention compartment. The tank's capacity between the small outlet and the top of the tank is called the detention capacity. The small pipe's maximum discharge rate is invariably mandated by council in litres per second and calculations made to determine the small pipe's size and the tank's required detention capacity are based on the roof harvest area (yield) and the maximum detention head. There will also be a larger safety overflow pipe at the top of the tank that flows into the larger vertical drainage pipe should the tank ever fill during a major storm. A failure in the system can happen when the mesh on the smaller outlet blocks up. When this happens, the top outlet will be expected to handle the entire roof flow on its own. Invariably, it will not have the capacity to do so and the tank will overtop. To eliminate this possibility, the smaller outlet should not have a meshed outlet and this can be substituted with a flap valve fitted on the end of the smaller pipe where it enters a branch on the larger vertical pipe. http://rainharvesting.com.au/products/t ... lap-valves As the smaller pipe will operate with a charged head, PVC DWV or pressure pipe should be used. DWV pipe is not compliant for pressure applications but there is no problem using it for this application. 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: Sewerage and Stormwater Costs - too high? 9Nov 30, 2013 10:30 am looked at Doc's earlier. building in metro melbourne. don't think we have a detention system quote is only for 1) Upgrade storm water to 100mm and extra work required within the site 2) Connection to Council's barrel drain 3) Road opening permits and inspection from Council 4) Removing excess spoil and making good 5) Re-instating the broken concrete pathway in front of the house to make connection to barrell drain. 6) Road opening permits and inspection from Council Re: Sewerage and Stormwater Costs - too high? 10Nov 30, 2013 1:55 pm $17.5 k sounds over the top but it's also a bad time of the year to be lining up work. You should always get 3 quotes. Try and get a drainer, they won't be hiring equipment for starters. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. It will be neat but you won't have much freeboard. At least they are not weep holes. Are you in a high intensity rainfall region? The regulatory slope is only required… 3 8264 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 8465 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 4858 |