Browse Forums General Discussion Re: On Site Detention - Charged Line? 2Jan 21, 2019 7:39 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: On Site Detention - Charged Line? 4Jan 26, 2019 10:10 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: On Site Detention - Charged Line? 5Jan 27, 2019 9:28 am robw17 The hydraulic plan is at the preliminary stage and I'm being told that the tanks have to go on the opposite side of the house to what we wanted "because I need to drain the outlet/overflow somehow to the street via gravity fall (Can not achieve that on eastern side due to levels - I can not hide the outlet/overflow on eastern side with raised garden bed, due to overland flows in front of the property)". That's not very clear so I checked with the hydraulic engineer what that meant and he confirmed it meant the OSD couldn't drain via a charged line "because it wouldn't work". When I pressed him about why he said he couldn't explain it to me. I take it that all downpipes are diverted to the tanks. Aha, you have a control pit but it still doesn't make sense to me as to why a charged pipe with the correct minimum elevation at the tank's detention overflow cannot connect to the control pit from your preferred east side. What mitigation capacity does the control pit have and do you know your Permissible Site Discharge (PSD)? Discharge control pit – this is located at the lowest point on the site. All flows leave the site through this pit. The pit contains an orifice in a stainless steel plate fixed to the side wall. The orifice is sized to limit the discharge of water from the site to the maximum permissible rate. As you have stated, if there is positive head from the tank's detention outlet, it would drain charged. For a hydraulic engineer to say that he couldn't explain to you something that is so basic is just extraordinary. Re draining the tanks straight to the kerb, the site has a maximum Permissible Discharge Rate which includes any surface water as well as the stormwater. This is why you cannot have two separate pipes draining to the kerb. 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: On Site Detention - Charged Line? 6Nov 09, 2019 12:26 pm Hi Rob, how is your build going? We are building in Oatley and have run into problems with our stormwater. In the end, what stormwater plan did you go with and was it approved by Council? Once you know the basics, the rest is easy. Read my post in the thread linked below. viewtopic.php?p=1919271#p1919271 2 19497 4 10817 Hi everyone, Looking for some advise. We are about to build an above ground pool in our backyard. There is a private sewer line running under the pool at 1.6m… 0 11731 |