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F-4. IGA WITH ARIZONA DEPARTMENT OF WATER RESOURCES FOR ARIZONA PROBABLE MAXIMUM PRECIPITATION STUDY Approve Intergovernmental Agreement (IGA) FCD 2009A010 between the Arizona Department of Water Resources (ADWR) and the Flood Control District of Maricopa County (District) for the Arizona Probable Maximum Precipitation (PMP) Study. This IGA is for cost sharing of the Study. The estimated total Study cost is $850,000 and will be shared by ADWR and the District with the District’s share not-to-exceed $200,000. The IGA shall become effective upon the date it is executed by both parties and shall expire on December 31, 2011. ADWR is leading an effort to update PMP values for the various climatic and topographic regions of Arizona, including Maricopa County and those watersheds that affect it. PMP is used to evaluate the safety of high and significant hazard potential dams. The District operates and maintains 20 high and 2 significant hazard potential dams in Maricopa and Pinal Counties. The updated PMP values will significantly reduce dam rehabilitation costs and allow for increased level of flood protection provided to residents of Maricopa County. This Agenda Item impacts all Supervisor Districts. (C-69-09-076-3-00)