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
Oh, I see. It’s funny how experts often have differing opinions.
The demolition contractor currently working on our site (https://www.hausbau-forum.de/threads/lage-stadtvilla-oder-efh-auf-500-m2-rechteck.33505/post-440418) said that two parties sharing a service shaft is not done; my neighbor should have a separate service connection installed at the ground floor level.
The site manager, on the other hand, said that this is often done if one connection is at the front and the other at the back, and that it’s just a matter of agreeing on the costs.
(We would be digging a shared trench, so it would be 50:50. The neighbor will compensate for the 5m (16 feet) distance with more personal labor involvement on shared trades anyway.)
The site manager also said that a DN 150 (6 inches) pipe is more than sufficient; you could even use DN 100 (4 inches), but that wouldn’t be his recommendation.
The demolition contractor currently working on our site (https://www.hausbau-forum.de/threads/lage-stadtvilla-oder-efh-auf-500-m2-rechteck.33505/post-440418) said that two parties sharing a service shaft is not done; my neighbor should have a separate service connection installed at the ground floor level.
The site manager, on the other hand, said that this is often done if one connection is at the front and the other at the back, and that it’s just a matter of agreeing on the costs.
(We would be digging a shared trench, so it would be 50:50. The neighbor will compensate for the 5m (16 feet) distance with more personal labor involvement on shared trades anyway.)
The site manager also said that a DN 150 (6 inches) pipe is more than sufficient; you could even use DN 100 (4 inches), but that wouldn’t be his recommendation.
Tolentino schrieb:
My neighbor should have a separate handover point installed at the finished ground level (FGL).
The construction manager said that this is often done when one is at the front and the other at the back; you just have to agree on the costs.
(We would make a shared trench, so 50:50.) I would recommend formalizing this clarification of the FGL—allowing the neighbor to connect to your pipe line and agree on the cost sharing for maintenance and sewer cleaning—in a private legal agreement notarized between parties (an additional contract without registering it in the land register).
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Nida35a schrieb:
In our case, the civil engineer handled it. He measured and installed the slope using a leveling device. Don’t forget the access points.May I ask how much that cost you? At least the region would be comparable to yours.
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