Va. Const. art. XI, § 2

In the furtherance of such policy, the General Assembly may undertake the conservation, development, or utilization of lands or natural resources of the Commonwealth, the acquisition and protection of historical sites and buildings, and the protection of its atmosphere, lands, and waters from pollution, impairment, or destruction, by agencies of the Commonwealth or by the creation of public authorities, or by leases or other contracts with agencies of the United States, with other states, with units of government in the Commonwealth, or with private persons or corporations. Notwithstanding the time limitations of the provisions of Article X, Section 7, of this Constitution, the Commonwealth may participate for any period of years in the cost of projects which shall be the subject of a joint undertaking between the Commonwealth and any agency of the United States or of other states.