Description: WatercourseOttawa feature set explain the connectivity of the surface flow through Ottawa and contiguous watershed areas. The major river systems found throughout Ottawa are the Rideau, South Nation, Mississippi, and Ottawa Rivers, and the four major tributaries are the Carp, Jock and Castor Rivers and the Bear Brook. WatercourseOttawa feature set is a consolidation of the two data sources. The first data source is the municipal drains records kept by Ontario Ministry of Agriculture, Food, and Rural Affairs (OMAFRA) available through Land Information Ontario (LIO) as the Constructed_Drain feature set, and the second is the watercourse mapping maintained by the Minitry of Natural Resources and Forest Ontario Hydrology Network (OHN) OHN_Watercourse feature set. The origin of of the OHN_Watercourse is the 1988 Ontario Base mapping and available through LIO’. WatercourseOttawa has been reviewed and updated based modelled flow paths created from high resolution (LiDAR derived) Digital Elevation Model (which was generated from 2012 to 2015), structures (culverts and bridge) information, and aerial images ranging from 1991 to 2014.WatercourseOttawa features are also categorized intro 11 segment types:1 – Natural2 – Modified3 - Passage through structure4 – Piped5 – Presence not apparent – previously mapped and not longer evident6 – Swale7 - Ditch8 – Waterbody flow path – estlimated flow path through a water body9 – Wetland flow path – a general direction of flow based on surface analysis10 – Creek to river connector – a link providing connection from a stream to the centrline of a river.99 – UnclassifiedNote that a ditch is stream order 0 and is defined as not being a self-creating feature - i.e. would not exist if not dug. Typically < 500 m from catchment edge.All attributes from the Constructed Drain features have been incorporated into the new watercourse features. The original watercourse-drain features may have been edited based on the new LiDAR and aerialinterpretations preserved while updating the feature data set.