Lake Erie North Shore Watershed Plan - Niagara Peninsula ...

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LAKE ERIE NORTH SHORE WATERSHED PLAN Table 18: Wignell Drain Subwatershed Restoration Strategy Restoration Opportunities Recommended Restoration Strategies Riparian Wetland Upland and Ecological Linkages 1. North of Durham Street: headwaters region priority should be placed on establishing riparian buffer habitat; the headwaters run through agricultural lands with little to no buffer. riparian buffers will help to reduce sediment and contaminant loads from adjacent land uses, and cool the water to enhance water quality and fish habitat. the establishment of riparian habitat is ideal in this portion of the subwatershed for creating important linkages that will connect fragmented natural areas providing cover for wildlife watercourses are managed as municipal drains therefore establishment of riparian corridors (e.g. deep rooted grasses & shrubs)should consider future maintenance activities (refer to engineers report and drainage BMP practice recommendations) 2. South of Durham Street watercourses receive partial cover from adjacent natural areas; however there are large sections of watercourses with little to no riparian habitat; therefore focus should be on establishment of riparian buffers in areas with little to no existing riparian west branch flows along the roadway therefore measures to establish and enhance buffer wetland restoration suitability mapping indicates very high wetland restoration suitability for riparian-wetland along watercourses providing important linkages between fragmented natural areas suitability also high for wetland enhancement and creation surrounding Wignell Drain Wetland Complex potentially linking complexes by filling in gaps creating a larger contiguous wetland and providing a corridor to West Humberstone in adjacent subwatershed protect and enhance existing wetlands (e.g., create a buffer of trees and shrubs between the wetlands and the agricultural activities) high suitability for filling in gaps in and around Nickel Beach Marsh PSW creating a larger natural block which will increase the natural heritage areas‟ ability to support a larger diversity of flora and fauna protect existing wetlands (e.g., create a buffer of trees and shrubs between the wetlands and the agricultural activities and subdivision) 188 very high suitability for upland restoration adjacent to existing natural heritage areas; focus should be on increasing core natural heritage areas, filling in gaps between adjacent areas and creating ecological linkages between fragmented areas and adjacent subwatersheds high suitability for enhancement around Wignell Drain Wetland Complex providing a Critical Function Zone, increasing interior size and creating a larger contiguous natural area which would increase the area‟s ability to support a larger diversity of flora and fauna moderate to high upland suitability in this portion of the study area therefore focus should be on enhancement of existing wooded areas and enhancement of Nickel Beach Marsh providing a Critical Function Zone, increasing interior size and creating a larger contiguous natural area which would increase the area‟s ability to support a larger diversity of flora and fauna opportunity for linkage creation
LAKE ERIE NORTH SHORE WATERSHED PLAN should be implemented to reduce sediment and contaminant loads from adjacent land use (road and agriculture) east branch flows through agricultural fields and golf course with little to no buffer strip therefore measures to establish and enhance buffer should be implemented to reduce sediment and contaminant loads from adjacent land use (golf course and agriculture) existing riparian should be maintained watercourses are managed as municipal drains therefore establishment of riparian corridors should consider future maintenance activities (refer to engineers report and drainage BMP recommendations) All restoration measures should where possible, benefit Species at Risk and provincially rare species Carolinian and native species should be used for all projects Project Opportunities NPCA Lake Erie North Shore Geomorphic Assessment Study (NPCA 2009b) between fragmented natural areas (e.g., south subwatershed along Lakeshore Road extending into adjacent subwatershed) Recommended Action for Public and Private Lands 1. Lakeshore Road East (WDMa): This section of watercourse is managed as a municipal drain; Wignell Drain. It has been channelized and there are sediment bars present within the watercourse. Bank instability is present in the form of bare soil extending up the bank, as well as undercut banks. The bare soil may be due to the tree canopy over the channel preventing vegetation from growing. Concrete slabs were identified along the left bank indicating that some erosion protection measures have been implemented by landowners. Duckweed and an oily sheen on the water surface were identified during a site visit in 2008. There is a floodgate present at this location which would constrict the channel. Some sediment deposition is present upstream near the floodgate. Measurements taken at channel cross sections would indicate that the watercourse at this field site has moderate entrenchment which results in flood waters having limited to no access to the floodplain. Therefore, the energy within the flow is contained in the channel. Recommendations for this site include not grading the channel banks too steep during the dredging process so that deep rooted vegetation can become established along the banks and stabilize the soil. Water quality testing should continue to be completed in this watershed to determine any water quality issues. Monitoring the accumulation of sediment along the channel bed can be done by the use of sediment traps throughout the watercourse. should be installed along the left bank to ensure adequate stabilization. discussed with the Drainage Superintendent. Proper bank protection measures All recommendations should be 189
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