Cal. Wat. Code § 135
The Water Resources Revolving Fund in the State Treasury is continued in existence. With the approval of the Department of Finance, there shall be transferred to, or deposited in, the fund all money appropriated, contributed, or made available from any source, including sources other than state appropriations, for expenditure on work within the powers and duties of the Department of Water Resources, including but not limited to services, new construction, major construction and equipment, minor construction, maintenance, improvements and equipment, hydraulic or other improvement projects, investigations, surveys, experiments, and reports, as authorized by the state agency for which such an appropriation is made or, as to funds from sources other than state appropriations, as may be authorized by written agreement between the contributor or contributors of such funds and the Department of Water Resources (or any predecessor), when approved by the Department of Finance.
Money so transferred or deposited is available for expenditure by the Department of Water Resources, for the purposes for which appropriated, contributed, or made available, without regard to fiscal years and irrespective of the provisions of Section 16304 of the Government Code. The Department of Water Resources may withdraw from the fund for use in work for other public agencies, local, state, or federal, such sums as may be necessary for such work where the money to be paid by such other agencies is not deposited in said fund in advance of the work being done.
Ca. Water Code § 135