Natural Resources Canada (NRCan) is seeking proposals (bids) from bidders for creating, validating, and correcting geospatial hydrographic network inferred waterbody flowlines (IWFs). In addition, validation and correction of existing flowlines and waterbody polygons will be required for certain cases. All creation, validation, correction, deletion, and adjustments are to be done following one work instruction document, with references to certain sections of an acquisition specification document. The data is for the Canadian Hydrospatial Network (CHN).