Res-2018-166 task order 7 - Laserfiche WebLink

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WATERSHED SC I ENCE & E N GI NEERING October 9, 2018 Scope of Work Reecer Creek FEMA Flood Hazard Analysis and Mapping Kittitas County, WA Watershed Science & Engineering (WSE) will conduct detailed hydraulic modeling and analysis to evaluate current flood risk along approximately 5.5 miles of Reecer Creek between the Town Ditch and KRD Canal, and along approximately 1.5 miles between University Way and the Reecer Creek Confluence with the Yakima River near Highway 97 . The purpose is to develop new flood hazard mapping to update the FEMA Digital Flood Insurance Rate Map (DFIRM) for Kittitas County. WSE will follow FEMA technical guidelines to complete the hydraulic analysis, then will submit the new flood map and supporting technical documentation to the County. The County will submit the documents to FEMA for review and incorporation into the DFIRM. FEMA will be responsible for refining the map to meet FEMA's detailed DFIRM cartographic standards, and for incorporating the new flood hazard data into the county-wide DFIRM and Flood Insurance Study report. The following tasks will be completed by WSE . Task 1. Data Collection and Review WSE will collect and review existing data needed to conduct the study. Data will include but not be limited to: • effective Flood Insurance Study (FIS) • preliminary FEMA DFIRM materials created by the STARR team • stream flow discharge records including those for neighboring gaged streams • historical high water mark locations and elevations • current and historical aerial photographs • topographic data including recent LiDAR • bridge and culvert plan and or survey • anecdotal information and photographs of past flood events on Reecer Creek Task 2. Field Reconnaissance WSE will conduct a one-day field reconnaissance of the study reach to: • document channel and floodplain conditions • examine road crossings • examine historical high water mark locations and elevations • refine locations where stream channel cross sections will be surveyed (see next task) WSE will also meet with County staff to discuss historical flood observations and survey needs. Task 3. Survey --Stream Cross Sections, Road Crossings WSE will create a map showing required survey locations including; stream channel cross sections and road crossing data. The County will use in-house survey staff or an on-call survey consultant to complete the survey. WSE staff will meet with the survey team to discuss the survey. Upon completion of the survey, the surveyor will provide WSE with the following: • original survey data -(FEMA requirement. It will be included in the project archive)