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Extent:   468883.317687988, 5009136.91369629, 547787.401123047, 5054666.2769165

Display Name:   Floodplain Area

Description:   The Floodplain_Modeleddataset captures floodplains delineated in accordance with established criteria (i.e., Federal-Provincial Damage Reduction Program (FDRP), etc.) and derived using accepted engineering models for hydrologic and hydraulic computations (i.e., OTTHYMO, HEC ll, HEC-RAS, etc.). The Floodplain_Modeleddataset delineatesflood prone areas: The majority of the dataset delineates the 100-year flood extent, capturing the area where a flood has a 100-year recurrence interval. This means that there is a 1% chance that a flood of this magnitude occurs in any given year.In North Dundas, for an area south of Guy Road and Hogaboam Road, the dataset includes a spill area. This area is bounded by the North Branch of the South Nation River to the west, the South Nation River to the south and east, and approximately Guy Road and Hogaboam Road to the north. Most of this area will be inundated by the 100-year flood; however, additional study is necessary to determine the extent of flooding and mitigation requirements, should development be proposed. Application of the Data[f[fill in before sharing dataset] Data SourceThe dataset was derived from a series of engineering studies, covering stretches of the South Nation River and two of its major tributaries, the Castor River and Bear Brook. The studies were conducted in the 1980s and 1990s as part of the FDRP. Large scale maps (i.e., 1:5.000, 1:2000), generated as part of the engineering studies, delineate the 100-year floodplain extents. Data was updated for floodplain studies for the City of Ottawa from 2015 (John Boyce / Boundary Municipal Drain and for Osgoode Gardens Cedar Acres Municipal Drain),for 2016 (McCooeye Creek, Cassidy Creek, and Grey’s Creek), for 2018 (Devine MD, Marshall Seguin MD and Nelson Charlebois Creek), for 2019 (McKinnons Creek, East Savage, McFadden Creek, South Bearbrook, Ebbers, Middle Castor and Buckles Creek) and for 2020 (Shaws and South Castor).Data was updated for floodplain studies for the United Counties of Prescott and Russell from 2019 (York Creek) and 2020 (South Indian Creek). RevisionsCassidy Creek on May 25, 2018 based on permit number 2017-OSG-R005.McKinnon's Creek on August 14th, 2018 based on permit number 2018-CUM-R0O6AThe authors and dates of the supporting studies are available upon request. Capture MethodologyThe dataset was digitized into an ArcGIS geodatabase by scanning and georeferencing the maps and digitizing lines off the maps in ArcMap. The original maps were in either NAD27 or NAD83 datums, and a datum conversion was necessary to generate a single dataset in NAD83. Completeness and AccuracyThe scope of the original FDRP was to generate mapping for the South Nation River and its major tributaries. Consequently, the dataset does not provide complete floodplain mappingfor the entire township. It should be assumed that other areas that would be inundated by a 100-year flood are not included in the dataset. The source maps reflect the physiographic and hydrologic conditions at the time that the engineering studies were completed in the 1980s and 1990s. In most cases, the studies have not been updated to reflect changes in these conditions. The conversion from paper maps to a digital GIS format involved steps that may have altered the positional accuracy of the lines. The process of scanning, georeferencing and manually digitizing may have resulted in a loss of spatial precision. South Nation River Conservation Authority assumes no responsibility or liability for errors or omissions resulting from inaccuracies resulting from the mapping.

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Type:   FeatureLayer

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Primary Key Field:   OBJECTID_1

Show Map Tips:   False

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Feature Label:   Floodplain Area

Feature Description:   UCPR Official Plan 2022 - Schedule C1 Floodplain Area

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Parent Layer: UCPR 2022 Schedule C1 Public Health and Safety

Data Provider:   Default

Time Zone ID:   N/A

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Supported Interfaces:  REST