Within 30 days after November 1, 1985, there shall be established in the Treasury of the United States a working capital fund to assist in the management of certain support activities of the Bureau of Reclamation (hereafter referred to as the “Bureau”), Department of the Interior. The fund shall be available without fiscal year limitation for expenses necessary for furnishing materials, supplies, equipment, work, and services in support of Bureau programs, and, as authorized by law, to agencies of the Federal Government and others. Such expenses may include the acquisition, replacement, and operation of a central computer and related automatic data processing equipment; engineering services; payroll and other management services; acquisition and replacement of equipment and facilities, including the purchase, lease, or rent of motor vehicles and aircraft within any limitations set forth in appropriations made to carry out the functions of the Bureau and such other activities as may be approved by the Director, Office of Management and Budget.