ᐅ Pressure wastewater drainage in challenging locations

Created on: 18 Feb 2024 11:27
M
Messerjoe
M
Messerjoe
18 Feb 2024 11:27
I would be very grateful for any tips regarding the drainage system of my old house.

I have outlined the current situation and two possible solutions.

Current situation:


Technical sectional drawing: inspection shaft on the left, basement and ground floor with pipes.


The house was previously drained via a soakaway pit.
Now it must be connected to an inspection shaft located 40m (130 feet) away, which is also much too high due to the hilly terrain.
A lifting station in the basement would unfortunately not help either, since the ground floor extends far above ground level.

Solution 1:


Sectional view: inspection shaft on the left, pressure water pump shaft on the right; ground floor and basement


I have now learned that the best option is a pumping station with a pressure pump on the property.
This would involve building a new shaft with one or two pumps in front of the house. Wastewater would be collected there, macerated, and pumped through a frost-proof 40m (130 feet) pressure pipe to the inspection shaft. In my opinion, no “loop” is needed to lift the water over a backflow level, since the inspection shaft itself is already quite high (above the site level at the house). Hopefully, this would work, but it is also a very costly solution (material costs alone around 10,000€).

Solution 2:


Section through basement with inspection shaft, pressure water pump in basement and ground floor


I am wondering whether a pressure pump could also be installed in the basement of the house. This would be a considerably cheaper solution, but I am not sure if it is allowed to pump directly from the basement through a long pressure pipe underground to the inspection shaft. Suitable pumps with maceration and sufficient capacity do exist, but they are typically used only as lifting stations to pump wastewater upwards to a gravity drainage system. Does anyone have more detailed knowledge about this?

Best regards and thanks,
Wolfgang