Drainage parking spaces / sewer connection needed?!

  • Erstellt am 2021-07-23 17:25:14

HansiW.

2021-07-23 17:25:14
  • #1
Hello everyone,

we are planning a hinterland development in the garden of my parents-in-law.
After appointments with the office, the land division is already being initiated and is expected to be completed in September.

A key issue now is the (rain) drainage.
Attached is a (of course not to scale) drawing of the property.

We have two options here:
Option A: Connection to the sewer (red squares) on my parents-in-law’s property. Basically approved by the city, easement recorded in the land register agreed with my parents-in-law, the civil engineer was here this week and has already checked everything. The sewer is deep enough (2.83m), estimate is available, about 5,000 EUR, turnkey ---- Here we are of course very enthusiastic, because:

Option B: Connection to the next sewer in the south. This would mean we would have to lay about 25-30m of pipes through the property + about 25m through the street. Rough estimate by the civil engineering office: about 35,000-45,000 EUR for the public areas + probably another 3,000-4,000 EUR on the property. ---- Costs are unrealistic.

Since access to the property can only be realized from the south, the parking spaces (planned carport) are very far away and lower than the house.
Now the city reminded us during the planning with Option A that we also need a connection to the sewer for the drainage of the parking and walkways on the property.

Since the info only came by email and the colleagues were already out for the weekend, this statement is causing us quite some trouble now...
On the internet, you can find a lot of information about parking space drainage for campers ( ;-) ), but so far I haven’t really figured it out, so the question goes out to the group if anyone is familiar with this!?

My first research in the development plan says the following:
“Gm. §9 (1) No. 20 Building Code: For the undeveloped private property areas, impervious surfaces are not allowed. The paved parts of the property - e.g. parking spaces, garage access roads, paths - must be executed with, for example, grass grid stones, gravel lawn, jointed pavement or permeable paving, etc.”

===> This reads to me as if we could do without the sewer connection, if we, for example, forget the carport and plan uncovered parking spaces in a non-impervious, permeable execution (grass grid stones or “eco-paving” are an option for us). Correct!?

At the same time, there is a document on the wastewater office's website which promotes the advantages of a soakaway system made of rain barrels and soakaway basins for sealed areas without sewer connection and gives tips for planning.

===> This reads to me as if we could still realize a carport with this option, without a sewer connection. Correct!?

Thanks very much for your input, your knowledge and your advice :)
 

guckuck2

2021-07-23 17:37:35
  • #2
You understood that correctly twice. However, infiltration via [Mulde], [Rigole], [Sickerschacht] etc. must be possible (consult soil expert) and approved.
 

HansiW.

2021-07-23 18:15:49
  • #3
Super, thanks to you. You really lowered my blood pressure ;-) Regarding the soil condition, I had already read about a seepage box on how to quickly conduct a first rough test myself (dig a 50x50x50cm hole, put in a gravel layer, fill with water, measure infiltration time). I want to try that on Sunday, so I can then get back in touch with the city accordingly next week :-)
 

HansiW.

2021-07-28 13:44:34
  • #4

Hi guckuck2, reply from the building authority in essence: "I have to inquire myself with the civil engineering/drainage department, but to my knowledge, traffic areas must be compacted and therefore sealed, and thus drained into the sewer..."
We are now waiting to see what information he will get from his colleagues.
Our civil engineer who is laying the sewer to the house was also very surprised by the statement.
 

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