Basic line planning property slight slope

Hello, we are currently planning the main pipelines for our single-family house. Primarily for the wastewater pipe and the drinking water supply on the property we have two different recommendations from our architect and the earthworks contractor for the pipeline route. For the wastewater, our architect recommends the shortest way out of the floor slab, which has the disadvantage that we get relatively many 90° bends and a longer pipeline route. Our earthworks contractor recommends going under the floor slab to avoid these bends and shorten the pipeline route, disadvantage being that you cannot access it anymore if something happens.

Does anyone have a recommendation, or is there a third way that would be better?

The property has a slight slope towards the transfer shafts (see elevation marks sketch in the attachment).

If anyone wants to write something about it: Please insert images via file, then as JPG or PNG I personally say that with this information you can hardly do anything. Probably ;) good drainage planning already starts with the floor plan design!

The architect is right, you always take the shortest route, although it probably wouldn’t matter if it was one meter more or less. The problem with accessibility is actually much more serious than the other one. The earthworks contractor only knows that he needs to work more precisely if necessary. It is important not to make direction changes at 90°, but rather to implement them as 2x45°, or even better 3x30°. And then ideally plan inspection openings before/after direction changes so that any blockages can be more easily cleared without having to dig up all the time. Through the inspection openings, it is also easier to check where a possible blockage might actually be.

Draw the two solutions in. For me, the line is the shortest connection between two points. Why so many bends are necessary there is not clear from your drawing.

: Architect means the path under the slab. It should be as short as possible due to accessibility. So in order of importance: shortest distance under inaccessible surface > few direction changes > short distance overall

good drainage planning already starts with the floor plan design! [ATTACH alt="Bildschirmfoto 2021-03-11 um 10.41.52.png"]58658[/ATTACH]

You are absolutely right. Unfortunately, this is seen far too seldom. The planner does not pay the additional costs anyway.