bool add_cost;
	/* At this point we got a flat tile with water at the ground and no bridge over it. Check for ownership */
	if (IsWaterTile(tile) && IsCanal(tile)) {
		ret = EnsureNoVehicleOnGround(tile);
		if (ret.Failed()) return ret;
		if (o1 != OWNER_NONE) {
			ret = CheckTileOwnership(tile);
			if (ret.Failed() && !_settings_game.construction.build_on_competitor_canal) return ret;
		}
	} else {
		add_cost = !IsWaterTile(tile);
		ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
		if (ret.Failed()) return ret;
		if (add_cost) {
			cost.AddCost(ret);
		}
	}