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F-2. IGA WITH THE UNITED STATES GEOLOGICAL SURVEY FOR WATER RESOURCES INVESTIGATIONS Approve Intergovernmental Agreement (IGA) FCD 2014A012, between the United States Geological Survey [Agreement #015WSAZ00200 (USGS)] and the Flood Control District of Maricopa County (District), for the period of October 1, 2014 to September 30, 2015, to continue collecting data on local watersheds. The total cost of the IGA is $263,980. The District’s costs under this Agreement will be $138,950, with the USGS contributing the remaining $125,030. Payments from the District are to be made quarterly. This Agreement will develop and evaluate long term flood histories on watercourses in Maricopa County, and provide information critical to the determination of the risk of flooding in these and similar watercourses. The information generated by the USGS’s ongoing work is vital to the safety of Maricopa County residents, and to the continuing hydrologic studies performed by the District. This agenda item impacts Supervisorial Districts 1, 2, 3, 4, and 5. (C-69-15-010-3-00)

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F-1. AMENDMENT TO IGA WITH THE UNITED STATES GEOLOGICAL SURVEY FOR WATER RESOURCES INVESTIGATIONS Approve amendment to Intergovernmental Agreement (IGA) FCD 2014A012, between the United States Geological Survey [Agreement #14WSAZ00200 (USGS)] and the Flood Control District of Maricopa County (District), for the period of October 1, 2014 to September 30, 2015. The amendment adds a new scope of work item to physically measure Manning’s n-value roughness coefficients (n) in order to calibrate hydraulic model roughness. The original total cost of the IGA is $263,980. The new total cost including this amendment is $338,980. The District’s costs under this Agreement will be $188,950, with the USGS contributing the remaining $150,030. Payments from the District are to be made quarterly. This Agreement will develop and evaluate long term flood histories on watercourses in Maricopa County, and provide information critical to the determination of the risk of flooding in these watercourses. This amendment covers a pilot study in 2 streams in Maricopa County, the Gila River and Lower Indian Bend Wash. The study will be used to test and develop new methods for quantifying n over a range of flows during a single event, and to enable better prediction of vegetation response to flows. The new technology and methods that will be incorporated into the study will allow physical determination of n over a range of flows and a variety of streams with greater accuracy than was previously possible. The information generated by the USGS’s ongoing work is vital to the safety of Maricopa County residents, and to the continuing hydrologic studies performed by the District. This agenda item impacts Supervisorial Districts 1, 4, and 5) (C-69-15-010-3-01)