Thompson Creek Flood Study Report - City of Peterborough

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.
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