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

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

LAKE ERIE NORTH SHORE

LAKE ERIE NORTH SHORE WATERSHED PLAN 3. South of Killaly Street to Lake Erie 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 upper east branches flow from 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 existing riparian should be maintained the main channel managed as municipal drain therefore establishment of riparian corridors should consider future maintenance activities (refer to engineers report and drainage BMP recommendations) a large portion of watercourse flows through wetland therefore focus should be on establishing riparian buffers south of wetland where there is little to none existing riparian should be maintained the main channel managed as municipal drain therefore establishment of riparian corridors should consider future maintenance activities (refer to engineers report and drainage BMP recommendations) agricultural activities and subdivision) wetland restoration suitability indicates very high suitability surrounding Beaver Dam Creek Pt. Colborne PSW and very high riparian-wetland suitability between wetland complexes focus should be on enhancement of existing PSW and filling in gaps and creating ecological linkages between fragmented wetland complexes facilitating in the movement of flora and fauna between natural areas 200 into adjacent subwatershed. A larger natural block could support a larger diversity of flora and fauna high suitability surrounding Beaver Dam Creek Pt. Colborne PSW, therefore focus should be on enhancement and filling in gaps creating a larger contiguous natural block opportunity for linkage creation between fragmented natural areas (e.g., golf course and adjacent natural areas) extending into adjacent subwatersheds 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 Recommended Action for Public and Private Lands NPCA Lake Erie North Shore Geomorphic 2. 1. Weaver Road (BDCMa): This section of watercourse is managed as a municipal drain; Beaver Dam Drain. It has been channelized and lacks any depositional features along the stream bed which indicate little flow diversity

LAKE ERIE NORTH SHORE WATERSHED PLAN Assessment Study (NPCA 2009b) within the channel. A bank protection structure, consisting of a concrete block wall, exists along the left bank of the channel adjacent to Weaver Road. . The riparian buffer along this reach is small and consists predominantly of herbaceous vegetation except in the wooded area. No pools exist but there is stagnant water present throughout the field site. A foot bridge that crosses the channel on private property is narrower than the channel width and may be considered a channel constriction. Algae, duckweed, and a brown film on the water surface were noted during a site visit in 2008. Slumping is occurring on private property on Weaver Road and fracture lines are present at the top of the bank. The asphalt driveway adjacent to the channel is cracking which further suggests bank instability. Bank failure is also present in the failing bank revetment adjacent to Weaver Road. Possible causes of instability include undercutting or pressure from in behind the wall. 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. Further assessment of the concrete block revetment should be done to determine the stability of the wall. If the foot bridge is found to be a channel constriction then it needs to be replaced with an appropriately sized bridge. Water quality should continue to be monitored within this watershed. Alternatives to traditional drainage design, such as wetland creation, floodplain development, and increasing channel curvature should also be considered. All recommendations should be discussed with the Drainage Superintendent. 2. Miller Road (BDCMb): This section of watercourse is managed as a municipal drain; Beaver Dam Drain. It has been channelized and lacks any depositional features along the stream bed which indicate little flow diversity within the channel. Bank instability is present on both sides of the channel in the form of bare soil extending up the bank; slumping; undercut banks; and fallen vegetation. For most of the field site there is no aquatic vegetation present within the channel. No pools exist but there is stagnant water present throughout the field site. Relatively deep unconsolidated sediment is deposited along the channel bed. Channel measurements indicate that the watercourse at this field site is entrenched to moderately entrenched 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. Alternatives to traditional drainage design, such as wetland creation, floodplain development, and increasing channel curvature) should also be considered. Water quality should continue to be monitored within this watershed. Monitoring the accumulation of sediment along the channel bed can be done by the use of sediment traps throughout the watercourse. All recommendations should be discussed with the Drainage Superintendent. 3. 3. Killaly Street (BDCMb-2): This section of watercourse is managed as a municipal drain; Beaver Dam Drain. It has been channelized and lacks any depositional features along the stream bed which indicates little flow diversity within the channel. Bank instability is present in the form of steep banks with bare soil extending up the bank. No pools exist along the bed but there is stagnant water present throughout the field site. Relatively deep unconsolidated sediment is deposited along the channel bed. At least 5 debris jams were present within the study site which is most likely due to over steepened banks that have become unstable. Channel measurements would indicate that the watercourse at this field site is entrenched to moderately entrenched 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. 201

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