Grafius Run

As of September 22, 2022, a design engineer has been selected. *The previous solicitation is listed below for reference Grafius Run is a perennial stream that runs under the city from its north end, and outlets to the Susquehanna River. At the north end of the City, Grafius has an east branch and a west branch. The drainage area of each branch is approximately 1.5 square miles. Over the years, through upstream development and the after-effects of confining an open stream (in a long culvert system), Grafius Run has become problematic to the City of Williamsport for two main reasons: The large volume of water that enters the inlet structures on the north end of the city during storm events cannot be successfully contained within the underground culvert system. It appears that the culvert system(s) do not have the capacity to convey these peak storms. The overtopping flood waters at the inlets travels at least 1/2 mile into the City, over roads. The preferred solution to these problems (and possible framework for a Scope of Services proposal) to these problems above is as follows: 1) Perform a detailed hydrologic and hydraulic evaluation of the site, developing peak flood water volumes for the 100 and 500 year storm events. 2) Preliminarily size two flood control basins, based on these water volumes, to contain peak floods, and allow lesser flows to exit. 3) Evaluate the existing site layout, topography, and existing land use to determine best location, and layout of the basins. Positioning the basins (and any subsequent back-water) within the confines of the City would be preferred, as opposed to allowing these elements to extend into neighboring Loyalsock Township. Note that the Selection of the Awarded Firm by the City of Williamsport will be based on Cost AND Qualifications, and a weighted scoring method likely be used to select the winning proposal. Therefore, selection will be based on: Total anticipated cost for design services Qualifications of the A/E firm to perform their work The City is Requesting a Full Scope of Services from interested firms, along with any legal agreements/details required for a successful, executable contract between the firm and the City. There is no formal standalone RFP document(s). This write-up serves as that document. The City reserves the right to reject any and all proposals. The method of Contractor Selection has not been Determined at this time.

Division 31 -	Earthwork, Erosion and Sedimentation Controls.
Division 33 -	Utilities, Storm Drainage Utilities, Ponds and Reservoirs.
Division 35 -	Waterway and Marine Construction, Shoreline Protection, Waterway Construction and Equipment.