ARCGIS Floodplain Mapping & Analysis

I need a GIS specialist to build a detailed topographic map of my project site and then delineate the 50-year and 100-year floodplain limits. The study area covers more than 5 square miles, so the workflow must handle a fairly large dataset without sacrificing accuracy... (Budget: $250 - $750 USD, Jobs: ArcGIS, ArcMap, Cartography & Maps, Data Visualization, Excel, Geolocation, Geospatial, Python)