Specifications include, but are not limited to: Task 1 & 2: Inventory Mapping Project The Consultant will populate an empty file geodatabase schema provided by the City with storm structure and conduit data. • The Consultant shall collect inventory of the City’s drainage system as defined by the City’s file geodatabase schema. A sample geodatabase schema file may be obtained from Kelly Fleming at kfleming@wichita.gov • The stormwater geodatabase may be revised during the project with additional fields or feature names as required to maintain compliance with the City’s asset management application. • The City will provide the Consultant with an electronic report and plans of the storm assets when available for collection. • The collection payment will be based on a unit of effort and is defined by acquiring all the necessary attribute information for the storm asset as defined in the geodatabase. The storm asset is a drainage structure in which one or more storm conduits are connected and surface runoff flows into or out of. Examples are manhole, catch basin, drop inlet, junction box, pipe end, headwall, bridge, weir, and other stream obstructions. A drainage system (pipe, box, open drainage ways, etc.) from drainage structure to a drainage structure is not considered a unit of effort. Information to be included in the geodatabase for a bridge asset will include the location, center deck elevation, and upstream and downstream bridge images. • The Consultant shall use a sub-centimeter GPS Unit with post processing and a rover pole/antenna for each unit of effort, unless unattainable due to site conditions. • All storm assets that do not comply with the specified horizontal and vertical controls using the GPS method, shall be flagged and collected with a Total Station. A separate unit of effort fee shall be charged to the City in the event a Total Station is required to accurately locate a storm structure within the tolerances specified in this task. • All storm conduit with diameters of 8” and larger shall be collected. (For the purposes of this proposal effort will include gathering of the “x”, “y”, and “z” State Plane Coordinates, through GPS methods. The inventory includes both public and private systems. • Import inventory data for drainage structure assets into the geodatabase. • Adhere to the projection and coordinate system as specified by City staff. (See Attachment A for Coordinate system specifications) • Include the following assigned attribute data information as specified by City staff. (See Attachment B for Database Entries List) • Associate a digital image of each storm structure to the geodatabase by naming the image file by the same naming convection used for the storm Structure #. • Meet with City staff on a quarterly basis to review the Consultant’s quality-control reporting. • The City will verify quality assurance on all deliverables prior to City acceptance and payment. • The Northing and Easting Coordinates of each structure shall have a horizontal control to within +/-1’ in the State Plane Coordinate System. • The storm structure top and the invert of all conduits (at structures) shall have vertical control to within 0.10’to NAVD88 Datum. • The storm inventory project may be extended annually for a period not to exceed five years, if mutually agreeable between the City and Consultant. • Storm structures with manhole lids shall be collected on the northern most point of the rim. If more than one manhole lid is on the storm structure, collect the lid on the left side of the structure, as viewed from the street. • Type 2 storm inlets shall be collected on the left rim closest to the curb, as viewed from the street. • Drop area inlets shall be collected on the northern most point of the outside frame. • Headwalls shall be collected in the center of the headwall. If there are multiple boxes with the same headwall, they will be shot separately at the center of each box on the headwall. • Pipe ends shall be collected at the flowline of the pipe end, not the top of the pipe. • End sections shall be collected at the flowline at the end of the end section • Beehive covers shall be collected following the same method as a manhole cover, use the northern most point of the rim. • 2x5 curb Inlets shall be collected on the left side top of curb, as viewed from the street. • 2x2 curb Inlets shall be collected on the left side top of curb, same as the 2x5, unless the cover is a manhole cover, which shall be collected at the northern most point of the rim. • Collect the rim elevation on all manholes and any other storm structure located within a project area. • The City will provide the Consultant with the most current storm structure and conduit GIS layers each quarter to assist the Consultant with assigning new Structure and Conduit #’s. • The Consultant shall deliver a separate geodatabase of all abandoned storm assets found through the review of the construction plans and field inspection with a report that lists the Structure # and Conduit Rec # that were removed or abandoned. Task 3: Inventory Virtual Drainage Network • The Consultant shall complete the mapping of a previously started virtual network of the City’s drainage system as defined in Task 1 & 2 using the same stormwater file geodatabase. • All stream or open channel networks shall be joined to form one common drainage network that incorporates each storm structure outfall. Storm structures shall be joined to a virtual storm structure to complete the drainage network. • The open channel drainage network or virtual conduits shall be drawn to relate to the physical length and slope of the channel, pond, lake, or stream using LiDAR and current aerial imagery supplied by the City. • Virtual storm structures shall be named using the first four digits of the aerial code followed by a hyphen and a numeric numbering sequence beginning at 3000. • The City has more than 1,000 virtual storm structures that may be reviewed as a guide to complete or update the virtual network. • The purpose of associating the physical storm assets to the virtual network is to be able to trace the flow path of runoff through multiple watersheds.
