The findings of the department required by subsection (c) of Section 12867 or by subsections (a) to (e) of Section 12868 need be made only once, at the time the department first recommends an entire project or such portion or portions thereof as constitute complete and usable independent units to the Legislature, and need not be made again each year thereafter in which the department recommends an allocation of funds therefor. If conditions change so as in the judgment of the department to warrant new or different findings, the department may however make additional or contrary findings, and make recommendations thereon to the Legislature.