Thompson Creek Flood Study Report - City of Peterborough

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Thompson Creek Detailed Flood Reduction Study City of Peterborough minimizing the impact of proposed development on the natural state of the Thompson Creek corridor while allowing the development to proceed. The study provides a number of recommendations on SWM strategy, natural environment and recreational potential of the Thompson Creek. 3.2.2 Available Data and Data Gaps The purpose of the current study was to develop a Detailed Flood Reduction Plan for the Thompson Creek study area based upon a technical analysis of flood vulnerability and potential remedial measures in an environmental assessment framework. The data required to do this study must be consistent with that purpose. A key question to be answered before proceeding with the analysis phase of the study was whether there were any critical data gaps which would prevent the completion of the required analyses. The approach used in the study was to develop an understanding of existing conditions (as a basis for environmental assessment and identification of specific flood problems) and then to develop and use various models/tools to test whether potential remedial options would be successful in addressing the flooding issues identified. Hence the assessment of data gaps was based upon whether there was sufficient information to characterize and understand existing conditions and to develop the necessary tools/models to assess remedial options. The types of data required included: Physiographic Data Topographic data (contour mapping) Land use data Drainage network information (plan and database of drainage infrastructure) Soils and/or surficial geology mapping Geomorphological data Hydrometeorogical Data Flow data for Thompson Creek Flow data for local drainage areas (i.e. storm sewer flows) Meteorological data (precipitation) Water level data for flood prone areas Water Quality Data Measurements for a range of parameters for surface water to characterize general conditions 14-06605-01-W01 City of Peterborough 13
Thompson Creek Detailed Flood Reduction Study City of Peterborough Biological Data Fish community data for Thompson Creek Fish habitat data for Thompson Creek Vegetation mapping (Ecological land classification) Wildlife, bird, herptofauna sighting data Wildlife, bird, herptofauna habitat data ESA, ANSI mapping VTE and species at risk data Reviewing these requirements in relation to the available data, indicated the following: All required physiographic data with the exception of geomorphic data was available in suitable form from either the City of Peterborough or ORCA. Part of the proposed work program included the completion of a Rapid Geomorphic Assessment for the Thompson Creek to fill this potential data gap. Topographic mapping was provided in the form of an AutoCad file with a contour interval of 0.5m. This was sufficiently accurate for mapping of flood lines and is consistent with the requirements of Ontario’s Technical Guidelines for Flood Plain Mapping. Sewer infrastructure data was provided as ARCVIEW .shp files with an associated database. There was some uncertainty regarding the accuracy of some components of the this database. Hence field surveys were completed to verify or modify those elements. Approximately 50% of sewer manholes were surveyed to obtain the ground elevation and pipe inverts. They were then compared to the information in the database. If necessary, the database was modified. In some cases, invert/ground surface elevations were not available and were obtained directly from the field surveys. The data was used to construct computer models of the storm sewer system. Using the combination of the sewer database and surveyed data, the models were sufficiently accurate for the purposes of the present study. Hydrometeorological data is generally available but the following data gaps were identified: • There is no flow data on Thompson Creek or on any of the local drainage storm sewers. This would have limited the ability to verify that the hydrologic models of the watershed were representative of its characteristics. Hence a short term flow monitoring program was initiated to address this data gap. 14-06605-01-W01 City of Peterborough 14
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Thompson Creek Flood Study Report - City of Peterborough

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