Laserfiche WebLink
i I i <br /> Ms. Shelly St. Pierre -7- June 17,2013 <br /> Deliverables: <br /> None. Included in Task 5. <br /> Task 4—Flood Inundation Mapping <br /> Objectives: Utilize routed flood discharges from Task 3 to develop downstream flood <br /> inundation mapping. <br /> • <br /> Subtasks: <br /> • Hydraulic Model Development: A steady state HEC-RAS hydraulic model will be <br /> developed to simulate hydraulic conditions along the flood path. The model will <br /> • utilize peak discharges from the HEC-HMS flood routing analysis of Task 3 and <br /> cross sections of the floodplain at representative and selected critical locations. <br /> • Downstream Inundation Mapping: Dam breach inundation maps will be developed <br /> utilizing USGS DEM data, 2008 City mapping and 2011 or later aerial photography. <br /> The maps will highlight roads,highways, and critical impacted infrastructure(water <br /> treatment facilities, schools,hospitals,fire stations, etc.). Tabular hydraulic <br /> information will be provided on the maps at critical locations and will consist of peak <br /> discharge,flood depth,flood elevation, flow velocity and floodwave arrival time. <br /> Inundation limits will be prepared in ESRI shapefile format in UTM coordinates <br /> (NAD 83,Zone 13 meters). Inundation maps will be provided on 11 by 17 inch <br /> sheets. <br /> Deliverables: <br /> None. Included in Task 5. <br /> Task 5—Draft Report Submittal <br /> Objectives: Develop a draft Flood Inundation Report and submit for review to the SEO and <br /> Town. <br /> • <br /> Subtasks: <br /> • Communication: RJH will communicate with the SEO and the Town on any <br /> significant technical concerns that arise at the earliest possible time. This will avoid <br /> major revision requests by SEO during review of the draft report submittal. <br /> • Draft Report: RJH will develop and submit a draft Flood Inundation Mapping Report <br /> to the SEO and City for review. The report will document all data,analyses and <br /> results including flood inundation mapping. Full supporting documentation for all <br /> analyses will be provided in appendices including calculations, electronic copies of <br /> models, spreadsheets and all data utilized. <br /> Proposal_Fish and Long Lakes.don <br />