Question juridique clé
Whether the cantonal decision violated the coordination principle for procedures requiring both a building permit and a forest-distance derogation.
Solution extraite
Yes. The access road was inseparable from the retention basin project, so the permit and special authorization could not be confirmed without coordinating the required forest derogation procedure.
Motifs extraits
Art. 25a LAT and the cantonal coordination rules require simultaneous publication and coherent, non-contradictory decisions when several approvals are needed. The cantonal court wrongly treated the forest derogation as unnecessary and should at least have suspended the permit until the derogation issue was decided.