Duffins Creek - Toronto and Region Conservation Authority

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12Figure 7:TRCA Flood Vulnerable Areas – Stage 5. Current mapping reveals approximately 64 structures and 55 roadswhere flooding can still be anticipated.
SummaryThe Duffins Creek watershed has a healthy flow regime withrespect to flooding and water quantity. It is one of the lastwatersheds within the TRCA’s jurisdiction that exhibits typicalrural watershed characteristics. Factors that contribute to thiscondition include the small amount of urbanization, the largenumber of natural features, the predominance of sandy soils,and the extensive forest cover and wetlands. All of these featuresresult in the promotion of infiltration, and the reduction ofstormwater runoff.Historical accounts of flooding within Duffins Creek arescattered and rare. Flooding that has occurred has beenprincipally due to ice jams and large storm events. Currentmapping reveals that 64 structures and 55 roads are susceptibleto flooding. These flood-vulnerable areas will be evaluated withfuture growth scenarios.An extensive stream flow monitoring network has beenestablished in this watershed. This network, coupled with lowflow investigations and a detailed understanding of thehydrogeology, geology and geomorphology, provides anexcellent position from which to manage the water resources ofDuffins Creek.The Toronto and Region Conservation Authority has recentlyundertaken an update to the watershed hydrology model and isdeveloping a water budget model for the entire Duffins Creekwatershed. These studies, along with the monitoring data, willbe used to establish infiltration targets, flood and erosion controlcriteria as well as to design stormwater management systems.13
Page 1 and 2: Duffins CreekState of the Watershed
Page 3 and 4: Table of ContentsIntroduction to Su
Page 5 and 6: Figure 1:The Hydrologic Cycle. Adap
Page 8 and 9: 6East Duffins Creek• Mitchell Cre
Page 10 and 11: Figure 4(i):Duffins Creek Annual Fl
Page 12 and 13: 10Figure 6:Stream Gauge Locations -
Page 16: ReferencesAquafor Engineering Limit

Duffins Creek - Toronto and Region Conservation Authority

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