ᐅ Main Pipeline Layout – Wastewater Drainage and Elevation Planning
Created on: 24 Sep 2020 19:39
T
Tolentino
Hello dear forum members,
I have now received a preliminary draft of the detailed construction plan. This will be adjusted again after the structural engineering calculations are completed, if necessary, and then finalized. Until then, I have time to consider whether everything makes sense as it is.
Below you can see first a site plan (from the building permit / planning permission) and a section from the draft ground drainage plan by the construction manager. Please note that the plans have different orientations, but I have added the north arrows anew in each case. In the ground drainage plan, I have marked the natural ground level (GFL) as an orange rectangle.
As you can see, the draft proposes that the wastewater pipes be combined and routed downward on the plan — that is, towards the neighboring property at the back, away from the street. This would require me to make one more directional change. The construction manager’s reasoning was that pipes should always be routed under the foundation slab on the shortest possible path because they are inaccessible afterward. That makes sense. However, looking at where the pipes come down elsewhere, is this really the average shortest route? There are more drainage pipes lying closer to the GFL strip; only the kitchen drain would be further away. Considering the longer pipe run for the main line and the additional required direction change, wouldn’t it be more sensible to route it to the right side of the plan (in the ground drainage plan) or upwards in the site plan?
The second topic is the height of the wastewater pipe. Here, the outlet height from the foundation slab is set at approximately 70 cm (28 inches) — I still need to confirm with respect to which height this refers; I assume the foundation slab’s top or underside. This is generally a standard height for wastewater pipes, but since the intended pipe route runs along the GFL, which also serves as the shared driveway for my neighbor and me, meaning it is a trafficked area, it is recommended to place the pipe deeper — from what I gather, about 150 cm (59 inches). Should I inform the general contractor about this now, or is it possible to add another step before the GFL? Especially because the existing wastewater shaft (see the west corner on the site plan) is to be used, and the pipe will have to cover a good distance of about 40 m (130 feet) to get there, the question about the actually necessary minimum height is important. The wastewater shaft is roughly 1.8 m (71 inches) deep. So, this roughly matches, but only if I can start on my preferred side of the house. If I have to go around the house, I would reach the shaft too low.
Do you have any ideas, suggestions, or remarks?
Thanks and best regards
Tolentino
I have now received a preliminary draft of the detailed construction plan. This will be adjusted again after the structural engineering calculations are completed, if necessary, and then finalized. Until then, I have time to consider whether everything makes sense as it is.
Below you can see first a site plan (from the building permit / planning permission) and a section from the draft ground drainage plan by the construction manager. Please note that the plans have different orientations, but I have added the north arrows anew in each case. In the ground drainage plan, I have marked the natural ground level (GFL) as an orange rectangle.
As you can see, the draft proposes that the wastewater pipes be combined and routed downward on the plan — that is, towards the neighboring property at the back, away from the street. This would require me to make one more directional change. The construction manager’s reasoning was that pipes should always be routed under the foundation slab on the shortest possible path because they are inaccessible afterward. That makes sense. However, looking at where the pipes come down elsewhere, is this really the average shortest route? There are more drainage pipes lying closer to the GFL strip; only the kitchen drain would be further away. Considering the longer pipe run for the main line and the additional required direction change, wouldn’t it be more sensible to route it to the right side of the plan (in the ground drainage plan) or upwards in the site plan?
The second topic is the height of the wastewater pipe. Here, the outlet height from the foundation slab is set at approximately 70 cm (28 inches) — I still need to confirm with respect to which height this refers; I assume the foundation slab’s top or underside. This is generally a standard height for wastewater pipes, but since the intended pipe route runs along the GFL, which also serves as the shared driveway for my neighbor and me, meaning it is a trafficked area, it is recommended to place the pipe deeper — from what I gather, about 150 cm (59 inches). Should I inform the general contractor about this now, or is it possible to add another step before the GFL? Especially because the existing wastewater shaft (see the west corner on the site plan) is to be used, and the pipe will have to cover a good distance of about 40 m (130 feet) to get there, the question about the actually necessary minimum height is important. The wastewater shaft is roughly 1.8 m (71 inches) deep. So, this roughly matches, but only if I can start on my preferred side of the house. If I have to go around the house, I would reach the shaft too low.
Do you have any ideas, suggestions, or remarks?
Thanks and best regards
Tolentino
It is all the more important that this is well planned and makes sense. An outlet through the floor is not necessarily required. If I understand correctly, the connection is supposed to be made to the wastewater shaft located 15m (50 feet) away at the upper left, right?
It makes sense to keep the pipes under the floor slab as short as possible. However, considering the position of the shaft, it might be a reasonable compromise to route the pipes out to the left side of the building. But there is no information yet on whether the pipe can even be run outside at that point.
Routing downward naturally results in the longest pipe run. Whether this is possible depends on the connection elevation at the sewer.
I also don’t see any issue with running the pipe directly under the floor slab and then upwards towards the street. That would be the shortest route.
It makes sense to keep the pipes under the floor slab as short as possible. However, considering the position of the shaft, it might be a reasonable compromise to route the pipes out to the left side of the building. But there is no information yet on whether the pipe can even be run outside at that point.
Routing downward naturally results in the longest pipe run. Whether this is possible depends on the connection elevation at the sewer.
I also don’t see any issue with running the pipe directly under the floor slab and then upwards towards the street. That would be the shortest route.
matte1987 schrieb:
It’s all the more important that this is well thought out and makes sense. A downward outlet from the building is not strictly necessary. If I understand correctly, the connection is supposed to go to the wastewater shaft on the upper left, about 15m (50 feet) away, right?
It makes sense to keep the pipes under the slab as short as possible. However, considering the location of the shaft, it might be a compromise to run the pipes out to the left side of the building. But there’s no information yet on whether it’s even possible to install the pipe on the outside in that area.
Going downward naturally results in the longest pipe run. Whether that’s feasible depends on the connection height at the sewer.
I don’t see a problem routing the pipe directly under the slab upwards towards the street either. That would be the shortest route. Yes, I am also rather apprehensive about this.
Yes, there is an existing wastewater shaft that is supposed to be used. Theoretically, pipes could be routed leftwards (through the garden).
But I don’t want to go left; I want to go right, because that’s where the utility corridor (GFL) is, and the neighbor behind will have to run their pipes through there anyway. The corridor will always remain free and must not be built over, so I will always have access to my pipes. Plus, it’s 5-6m (16-20 feet) shorter than on the plan. For the earthworks, there are synergies or shared costs if we both go through the utility corridor.
I’m also considering whether it might ultimately be better to simply commission a new shaft in the utility corridor…
Knöpfchen schrieb:
I would follow the given plan and add a flushing connection (Finor) leading outside at the last point (at the very top in the plan). I don’t quite understand. What does that mean?
Nida35a schrieb:
If drainage from the utility corridor goes upwards on the plan, the alternative is better because it’s estimated to be 6m (20 feet) shorter and 6cm (2.4 inches) higher. That’s how I see it so far as well. But the site manager argues there will be longer pipe runs under the slab. I don’t fully get that, but maybe I’m missing something?
At first glance, the pipe lengths are the same. I assume he wants to have all the pipes (water, wastewater, electricity, heating, etc.) in one trench. We have placed this trench directly next to the ground floor level (GFL) and have connected everything from there. We also have a flush connection for wastewater there. Every autumn, water runs for an hour from the cistern, and from there it is 60m (200 feet) to the sewer. I’m only helping Berlin by flushing the pipes free of leaves.
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