Index: src/water_cmd.cpp
===================================================================
--- src/water_cmd.cpp	(revision 10888)
+++ src/water_cmd.cpp	(working copy)
@@ -567,6 +567,11 @@
 						)) {
 					break;
 				}
+
+				_current_player = OWNER_WATER;
+
+				Vehicle *v = FindFloodableVehicleOnTile(target);
+				if (v != NULL) FloodVehicle(v);
 			}
 			/* FALLTHROUGH */