Facts
The facts concern the Ferrages stream that crosses the adjacent parcels no. 8288 and 8294 in the municipality of Vully-les-Lacs (VD). The stream is currently underground and passes through a 600 mm diameter pipe, with insufficient hydraulic capacity resulting in frequent overflows. As part of the adoption of two partial zoning plans, the Vaud Cantonal Service for Water, Soil and Sanitation (SESA) issued the authorization for the daylighting of the downstream section of the stream. The owners of the parcels concerned, C., D. (later A. SA) and B., opposed this decision.Considerations
The Administrative and Public Law Court of the Vaud Cantonal Tribunal partially upheld the owners' appeal, adding the condition that access to the garage on parcel no. 8288 be guaranteed. For the rest, it confirmed the SESA decision and the partial zoning plans.
The Federal Tribunal dismissed the owners' appeal. It considered that Arts. 38 and 38a of the Federal Act on the Protection of Waters (WPA) as well as Arts. 3 and 4 para. 2 of the Federal Act on the Regulation of Watercourses (FRWA) provide a sufficient…