Background Report - Town of Georgina

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Sutton Secondary Plan Review Study May 2008 Existing Environmental Conditions and Opportunities/Constraints Analysis Project No. TA4468 • Off-line ponds draining into river; • Obstructions to fish passage; • Water taking; • Reduction in groundwater recharge; • Increased water temperature; and, • Nutrient loading (nitrogen, phosphorous) from agricultural practices and urban stormwater runoff (LSRCA 2002). 3.6 Fisheries Discussion The Black River is a productive system that provides habitat for coldwater, coolwater and warmwater fish species along with an extensive natural corridor system with a direct connection to Lake Simcoe. However, anthropogenic induced degradation has limited the potential of this system. Direct examples of this within the study area, as previously mentioned, include in-stream barriers, nutrient loading, and bank/channel alteration. As a result, there are numerous restoration opportunities associated with the Black River within the study area. The river could improve through implementation of the following restoration activities: • Removal of barriers; • Treatment of urban stormwater runoff; • Groundwater recharge; • Bank/floodplain restoration; and, • Riparian plantings to increase shading. In brief, removal of in-stream barriers or installation of fish ladders may increase fish production through migration, re-establish of natural sediment transport processes, and reducing thermal loading. Riparian plantings would help to rehabilitate and stabilize altered stream banks and floodplain areas. Benefits associated with this activity include, increased bank stability, stream shading, food inputs and shore cover for both aquatic and terrestrial organisms. LGL Limited environmental research associates Page 8
Sutton Secondary Plan Review Study May 2008 Existing Environmental Conditions and Opportunities/Constraints Analysis Project No. TA4468 3.7 Corridors/Linkages The Black River provides an important north-south riparian corridor function that provides a linkage between the Oak Ridges Moraine to the south and the Lake Simcoe shoreline to the north. The riparian corridor also provides a connection to the large forest blocks within the study area that provide an eastwest connection between natural areas beyond the study area. The large, contiguous forest block in the northwest corner of the study area provides an important connection with the Maskinonge River to the west. The Maskinonge River corridor provides a southerly connection to the Holland River watershed. Combined, these large forest/wetland blocks and corridors comprise a key component of the Greenbelt Plan Natural Heritage System within the Town of Georgina and the Region of York. 3.8 Environmental Policy Areas From an environmental policy perspective, the Black River corridor and the large forest/wetland blocks within the study area are identified as key components of the Town of Georgina and Region of York Greenlands System. The study area supports a number of evaluated wetlands including: • Willow Beach Swamp Provincially Significant Wetland (PSW) Complex located in the northwest portion of the study area; • Vachell Swamp PSW Complex located in the southeast corner of the study area; • Mossington Park PSW Complex associated with the Black River; and, • Sibbald Point Wetland Complex (Locally Significant Wetland - LSW) located in the northeast corner of the study area. Environmentally Significant Area’s (ESA) within or adjacent to the study area include Mossington Park and two shoals along the Lake Simcoe shoreline (Mossington Point, Townline shoals). 3.9 LSRCA Regulation Area The LSRCA previously regulated watercourses and flood/fill areas under the Fill, Construction and Alteration to Waterways Regulation. Subsequent to May 8, 2006, this regulation has been superseded by a new regulation, referred to as the Development, Interference with Wetlands and Alterations to Shorelines and Watercourses, Ontario Regulation 179/06. Regulated areas within the study area are mapped on Figure 2. LGL Limited environmental research associates Page 9
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Background Report - Town of Georgina

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