+(isDone, ClosedFreeBoundary, OpenFreeBoundary) = geompy.GetFreeBoundary(HYDRO_garonne_1)
+geompy.addToStudyInFather(HYDRO_garonne_1, ClosedFreeBoundary[0], "ClosedFreeBoundary")
+
+freeBoundary = geompy.ExtractShapes(ClosedFreeBoundary[0], geompy.ShapeType["EDGE"], True)
+freeBoundaryIds = [ geompy.GetSubShapeID(HYDRO_garonne_1, freeBoundary[i]) for i in range(len(freeBoundary)) ]
+print "freeBoundaryIds", freeBoundaryIds
+
+[litMineur_droite] = geompy.GetSharedShapesMulti([garonne_riveDroite, garonne_litMineur], geompy.ShapeType["EDGE"], True)
+[litMineur_gauche] = geompy.GetSharedShapesMulti([garonne_riveGauche, garonne_litMineur], geompy.ShapeType["EDGE"], True)
+geompy.addToStudyInFather(HYDRO_garonne_1, litMineur_droite, "litMineur_droite")
+geompy.addToStudyInFather(HYDRO_garonne_1, litMineur_gauche, "litMineur_gauche")
+rives = [litMineur_droite, litMineur_gauche]
+rivesIds = [ geompy.GetSubShapeID(HYDRO_garonne_1, rives[i]) for i in range(len(rives)) ]
+print "rivesIds", rivesIds
+
+edges_litMineur = geompy.GetSharedShapesMulti([HYDRO_garonne_1, garonne_litMineur], geompy.ShapeType["EDGE"], True)
+edges_riveGauche = geompy.GetSharedShapesMulti([HYDRO_garonne_1, garonne_riveGauche], geompy.ShapeType["EDGE"], True)
+edges_riveDroite = geompy.GetSharedShapesMulti([HYDRO_garonne_1, garonne_riveDroite], geompy.ShapeType["EDGE"], True)
+edges_litMineurIds = [ geompy.GetSubShapeID(HYDRO_garonne_1, edges_litMineur[i]) for i in range(len(edges_litMineur)) ]
+edges_riveGaucheIds = [ geompy.GetSubShapeID(HYDRO_garonne_1, edges_riveGauche[i]) for i in range(len(edges_riveGauche)) ]
+edges_riveDroiteIds = [ geompy.GetSubShapeID(HYDRO_garonne_1, edges_riveDroite[i]) for i in range(len(edges_riveDroite)) ]
+
+print "edges_litMineurIds", edges_litMineurIds
+print "edges_riveGaucheIds", edges_riveGaucheIds
+print "edges_riveDroiteIds", edges_riveDroiteIds
+
+sectionsIds = [Id for Id in edges_litMineurIds if Id not in rivesIds]
+print "sectionsIds", sectionsIds