Service Description: TRCA hydrogeology staff created the layer in Viewlog 4.0 by creating nodes at irregular intervals (perhaps 100 m intervals where the contours were tight and up to 1000 m where the break in slope was obvious and the surficial geology showed a till/sand contact). The interpretation largely relied upon Dr. Rick Gerber's rule of thumb of 135 m asl for the elevation of Lake Iroquois (established in the Duffins Watershed) but geological judgment was used where the OGS Surficial Geology and break in slope appeared to deviate from the rule of thumb. In addition, specific boreholes, such as the one installed by TRCA hydrogeology staff at West Deane Park along Mimico Creek where sands associated with the Iroquois shoreline were discovered, were relied upon to justify following the contours up river valley where erosion makes interpretation from surficial geology difficult. The layer was then exported as a shapefile.
Service ItemId: 68c862bb27a24c50995c5af77dc962b5
Has Versioned Data: false
Max Record Count: 2000
Supported query Formats: JSON
Supports applyEdits with GlobalIds: False
Supports Shared Templates: False
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Description: During the review of the Carruthers Watershed, it came to the attention of TRCA hydrogeology staff that the Iroquois Shoreline in the Geologic Folder of the TRCA corporate data layers did not follow the Physiography established by Chapman and Putnam 1984 (The Physiography of Southern Ontario). It was then noted that within the Duffins Watershed the shoreline did not extend north along the Duffins River nor turn south along the height of land at the hamlet of Greenwood - instead the shoreline appeared to offset by about 1 km. TRCA hydrogeology staff brought the issue forward with Dr. Rick Gerber of the YPDT-CAMC team who stated that he had noticed the same thing when he prepared the Duffins and Carruthers watershed report in the early 2000s. He believed the error to be a NAD 83 / 27 conversion error.
Creator: Kristina Anderson, Hydrogeologist Engineering Services / Restoration & Infrastructure Toronto and Region Conservation Authority 416.661.6600 x5732 kanderson@trca.on.ca Reviewer: Steve Holysh, Hydrogeologist Program Manager, Watershed Strategies YPDT-CAMC 416.661.6600 x5588 sholysh@trca.on.ca
Spatial Reference: 26917 (26917)
Initial Extent:
XMin: 669433.962276271
YMin: 4760312.10280522
XMax: 709897.41296787
YMax: 4944620.89743892
Spatial Reference: 26917 (26917)
Full Extent:
XMin: 591033.50012207
YMin: 4793010.50012207
XMax: 788297.87512207
YMax: 4911922.50012207
Spatial Reference: 26917 (26917)
Units: esriMeters
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