The legislature finds that the lack of certainty regarding water rights within a water resource basin may impede management and planning for water resources. The legislature further finds that planning units conducting water resource planning under chapter 90.82 RCW may find that the certainty provided by a general adjudication of water rights under this chapter is required for water planning or water management in a water resource inventory area or in a portion of the area. Therefore, such planning units may petition the department to conduct such a general adjudication and the department shall give high priority to such a request in initiating any such general adjudications under this chapter.