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Home My WebLink AboutResolutiontoApproveTO7WSEKITTITAS COUNTY DEPARTMENT OF PUBLIC WORKS AGENDA STAFF REPORT AGENDA DATE: October 16, 2018 ACTION REQUESTED: Request to Approve a Resolution to Authorize the Chair's Signature on Watershed Science and Engineering Task Order No. 7; Reecer Creek FEMA Flood Hazard Analysis and Mapping BACKGROUND: In mid-August 2018, Public Works received notification from the Federal Emergency Management Agency (FEMA) of Cooperative Technical Partnership grant award of $50,000 towards creating a two dimensional flow model for approximately seven (7) miles of Reecer Creek. The Flood Control Zone District is providing $50,000 in grant match. Watershed Science and Engineering (WSE) is the District's flow model developer and the attached Task Order exceeds the Public Work's Director signatory authority. INTERACTION: Public Works RECOMMENDATION: Authorize the Chair's signature on WSE Task Order No. 7. HANDLING: Return one original to Public Works ATTACHMENTS: Resolution; Task Order No. 7 LEAD STAFF: Mark R. Cook, Director BOARD OF COUNTY COMMISSIONERS COUNTY OF KITTITAS STATE OF WASHINGTON RESOLUTION NO. 2018 - AUTHORIZING THE CHAIR'S SIGNATURE ON WATERSHED SCIENCE AND ENGINEERING TASK ORDER NO. 7 — REECER CREEK FEMA FLOOD HAZARD ANALYSIS AND MAPPING WHEREAS: Public Works has received a grant from the Federal Emergency Management Agency supporting flood hazard analysis and mapping for approximately seven (7) miles of Reecer Creek; and WHEREAS: Watershed Science and Engineering (WSE) is an approved professional service provider selected from an open solicitation and master contract award process in 2017; and WHEREAS: WSE has a Task Order requested by Public Works supporting the FEMA grant award; and NOW, THEREFORE BE IT RESOLVED that the Board of County Commissioners, in the best interest of the public, does hereby authorize the Chair's signature on WSE Task Order No. 7; Reecer Creek FEMA Flood Hazard Analysis and Mapping. DATED this 16th day of October, 2018, at Ellensburg, Washington. BOARD OF COUNTY COMMISSIONERS KITTITAS COUNTY, WASHINGTON Laura Osiadacz, Chairman Attest: ❑ Clerk of the Board- Julie Kjorsvik Obie O'Brien, Vice -Chairman ❑ Deputy Clerk of the Board- Mandy Buchholz Cory Wright, Commissioner �Dll 10 „. KITLR.45 COUNT\' KITTITAS COVNTY DEPARTMENT OF PUBLIC WORKS Formal Task Order Document WATERSHED Science & Engineering Task Order Number Maximum Amount Payable $54,980 _ Completion Date _12/31/2019 The general provisions and clauses of Local Agency Agreement Number KCPW2017- 19HYD2 shall be in full force and effect for this Task Order. Location of Project: Kittitas County Project Title: Reecer Creek FEMA Flood Hazard Analysis and Mapping Description of Work: See attached Scope of Work Cost Breakdown: See attached Scope of Work Completion Date: 12/31/2019 Agency Signature: Date: Consultant Signature: Date: 10/9/2018 vii WATERSHED �` SCIENCE & ENewr_RIN G 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) �A► WATERSHED SCIENCE & ENGINEERING October 9, 2018 • AutoCAD file showing location and elevation of each surveyed point • ASCII file of survey points (PNEZD) Task 4. Hydrologic Analysis — Flood Discharges WSE will estimate the magnitude of the 10-, 50-, 100-, and 500 -year annual instantaneous peak flood discharges using regional relationships and will develop flood inflow hydrographs for Reecer Creek. Task 5. Hydraulic Modeling WSE will create two separate two-dimensional (2D) hydraulic models to cover the two Reecer Creek study reaches: One model will cover Reecer Creek from the EWC Canal to the KRD canal (approximately 5.5 miles), and the second will cover Reecer Creek between University Way and Interstate 90 (approximately 1.5 miles). Both models will be completed using the U.S. Army Corps of Engineer's Hydraulic Engineering Center - River Analysis System (HEC -RAS). The 2D models will be used to estimate flood inundation limits, flow paths and FEMA specific data including floodplain boundaries. The models will depict channel and floodplain geometry using field surveys and 2011 LiDAR. The geometry of road crossings will be coded using surveys, as -built plan sets, and/or dimensions collected by WSE during the field reconnaissance. Required model variables including Manning's roughness values and culvert entrance and exit loss coefficients will be determined through model calibration or estimated using engineering judgement. Downstream boundary conditions will be established using normal depth method internal to the model. If reliable high water mark and discharge data can be collected, WSE will calibrate the model to reproduce the event(s). If data is not available, WSE will use engineering judgement to refine the model to generally reproduce flood characteristics observed by County staff and floodplain residents. Once the model is complete, it will be run for the 10-, 50-, 100-, and 500 -year events. 100 -year results will be used to generate the flood inundation boundaries and base flood elevations necessary to update FEMA mapping. Task 6. Field Verification of Hydraulic Modeling WSE will conduct a one -day field reconnaissance of the study reach to verify initial modeling results and assumptions. This will include collection of additional field measurements as necessary to update the model to accurately reflect observed conditions. Task 7. Flood Hazard Work Map WSE will use the 2011 LiDAR, field survey data, and County GIS layers to create the base map upon which the flood data will be added. WSE will map 100 -year flood inundation boundaries and base flood elevations (100 -year flood water surface elevations) based upon the hydraulic modeling completed in Task 5. WSE will meet with the County to present and discuss the preliminary maps. WSE will refine the maps upon receipt of County comments. Assumptions: Study maps will be submitted as "Approximate Zone A" mapping with base flood elevations. v� WATERSHED SCIENCE & ENGINEERING Task S. Study Report October 9, 2018 WSE will prepare a technical report to document study methods, assumptions, and results. The report will include all materials required by FEMA including flood profiles, data tables and the flood hazard work map. The report will be submitted to the County for review and comment. WSE will finalize the report upon receipt of comments and will then prepare the FEMA submittal package. Time has also been included under this task to allow for WSE's senior engineer to participate in a community meeting in Kittitas to present and discuss study results. Task 9. FEMA Submittal and Coordination The County will submit the study to FEMA. WSE will support the County through the FEMA review. Note — it will be the responsibility of FEMA or their study contractor to refine the flood hazard work map to meet required detailed DFIRM cartographic standards, and for incorporating the new flood hazard data into the county -wide DFIRM and Flood Insurance Study report. Task 10. Project Administration WSE will conduct general project administration activities including keeping the County's project manager informed of all significant project related news, preparation of monthly invoices and general contract management. WSE will provide information needed by the County's project manager to upload progress reports and study materials to the MIP. WSE will upload certain materials when required. Cost See attached spreadsheet. Schedule fi b 1- WATERSHED SCIENCE k ENGINEERING 110 Prefontalne Place South, Suite 508 Seattle, WA 98104 Tel. (206) 521-5000 Estimate of Professional Services Prepared for: Kittitae County Project: Reecer Creek Hours Sr.Scien. FEMA Flood Hazard Analysis and Mapping Date: October 9, 2018 Prepared By: Chris Frei TASK DESCRIPTION Prin Sr.Eng.l Sr.Eng.11 Hours Sr.Scien. Jr.Eng. GISSpecialis Contract Admin Totals 1. Data Collection and Review 10 10 $2,555 2. Field Reconnaissance 4 13 13 $4,1]8 3. Survey Coordination-- Stream Cross Sections. Road Crossings 05 6 t IM25 4. Hydrologic Analysis— Flocd Discharges 2 6 2 $1,549 . Hydraulic Modeling 8 2 40 122 $20,752 6. Field Verificationo y rau Ic Modeling 12 15 3,375 T Flood Haddard WorkMap 2 16 25 ,443 8. Study Report 6 30 24 ,$8.330 9. FEMA Submittal and Coordination 2 22 10 $4,813 10, Administration 4 8 4 $2,301 Total Hours and Direct Labor Cost (OL) Labor Rate($/M) TOTAL LABOR COST 240 $213.59 1 $5,126 20 $189.19 1 $378 134.0 1 $15257 1 $20,444 0.0 1 $12520 1 $0 198.0 $10297 $20.388 1 $104,16 1 $0 $56.53 $226 $54,420 Direct Expense Detail Units Rate Cost Travel to Project Site 936 $0.545 $510 Reproduction and Communication $50 Gage Materials Total $560 Labor Direct Expenses Total