Kernrechtsfrage
Whether the water connection fee could be calculated on the building insurance value including the single-object surcharge.
Extrahierter Entscheid
Yes. The tariff's reference to the insurance sum covers the insurance value as determined by the building insurer, including the single-object surcharge.
Extrahierte Begründung
The equivalence principle permits schematic criteria based on average experience. The insurance value is a widely accepted proxy for the benefit of the connection, and using it with the surcharge is not manifestly unreasonable or arbitrary, even for a group development.