CC - Agendas - City Council - REGULAR - 10/23/2012

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I1 . 3: COUNCIL AGENDA MEMO — October 23, 2012 DEPARTMENT: Pubic Works AGENDA ITEM: Approval of a professional services agreement with JE Fuller Hydrology & Geomorphology, Inc., to update Willow Creek and Willow Creek Tributary FEMA floodplain delineations and design water utility scour protection in an amount not to exceed $135,257.00 Approved By: Date: Department Head: Mark Nietupski 10/10/2012 Finance Director: Mark Woodfill City Manager: Craig McConnell ij � .� Item Summary This item is to approve a professional services agreement with JE Fuller Hydrology & Geomorphology, Inc., for the engineering analysis, preparation and submittal of an updated FEMA floodplain delineation for Willow Creek upstream of Willow Creek Road to downstream of Jack Drive, and the Willow Creek Tributary from its confluence with Willow Creek to approximately 1000' upstream of Clearwater Drive. In addition this engineering services agreement includes the production of engineering design plans for construction of scour protection for three existing water transmission mains crossing Willow Creek. On October 11, 2011, City Council approved an Intergovernmental Agreement (Resolution No. 4103-1213) with the Yavapai County Flood Control District which provides funding for Willow Creek and Tributaries Drainage Projects. Background In FY11 the City completed initial study of Willow Creek from the Willow Creek Road Bridge upstream to Williamson Valley Road. This reach of Willow Creek contains a channel segment that includes approximately 2500' of a levee embankment intended to protect adjacent properties from flooding. The levee was constructed in the mid-1980s and originally approved by the Federal Emergency Management Agency (FEMA). Since that time, FEMA's levee certification criteria and their Levee Analysis Mapping Program (LAMP) applied new structural and floodplain modeling guidelines that resulted in the aforementioned being within the 100 year regulatory floodplain. More recently, FEMA has revised the LAMP guidelines to be less restrictive which may result in reducing the floodplain for levee protected landside properties. JE Fuller will coordinate with FEMA officials in the analysis and review to provide an accurate representation of the 100 and 500 year floodplains and clarify the status of these properties. 1