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
But you would know where his sanitary fixtures are grouped together and whether he is building with a basement (which could mean a layout change) or without (where it would go through the slab at a rather specific point).
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I suspect that it will roughly follow the route you highlighted in green, but extending about 2 to 2.5 m (6.5 to 8 feet) beyond the "o" in "Residential Building II" from its base area, so approximately 2 to 2.5 m (6.5 to 8 feet) longer than in your drawing.
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If there are two separate wastewater pipes, the neighbor cannot lay a line through your property to the inspection chamber, as there is no ground-level access (GFL). And if his mother-in-law drops a rag in the toilet, you still end up having to dig up your garden to help him.
That's correct. Although the preliminary contract guarantees a branch line to the wastewater shaft, as far as I know, it is not registered in the land register, at least not as a building easement.
That almost argues in favor of installing a shaft directly in the finished ground level... although, that could also be done later...
That almost argues in favor of installing a shaft directly in the finished ground level... although, that could also be done later...
So, the construction manager agrees with my proposal. For wastewater, it is at least just as good, if not better.
He is not concerned about the elevation connection. We can stay at a depth of 1 meter (3.3 feet) even under the driveway, as long as the soil is well compacted.
He also mentioned that a pipe length of up to 75 meters (246 feet) is still acceptable, so with our maximum of 50 meters (164 feet), we are well within limits.
He believes it could be done as a self-installation, but his recommendation is to have it done by a civil contractor.
I am now gathering quotes, and then I will decide together with my neighbor how to proceed.
We still have a bit of time before the utility connection is required anyway.
He is not concerned about the elevation connection. We can stay at a depth of 1 meter (3.3 feet) even under the driveway, as long as the soil is well compacted.
He also mentioned that a pipe length of up to 75 meters (246 feet) is still acceptable, so with our maximum of 50 meters (164 feet), we are well within limits.
He believes it could be done as a self-installation, but his recommendation is to have it done by a civil contractor.
I am now gathering quotes, and then I will decide together with my neighbor how to proceed.
We still have a bit of time before the utility connection is required anyway.