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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 and fish habitat before outletting to Lake Erie existing riparian should be maintained watercourses are in part managed as municipal drains therefore establishment of riparian corridors should consider future maintenance activities (refer to engineers report and drainage BMP recommendations) identifies numerous areas suitable for wetland creation: see map 152 opportunity for creation of ecological linkages between fragmented natural areas facilitating in the movement of flora and fauna between natural areas 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 1. Burnaby Road (CDHeadwaters): This section of watercourse is managed as a municipal drain; Casey Shore Geomorphic Drain North Branch. It has been channelized and lacks any depositional features along the bed which indicate Assessment Study (NPCA little flow diversity within the channel. At least 3 debris jams were present upstream of the culvert, which could 2009b) be due to an undersized culvert or bank instability. There is some bank instability present in the form of bare soil extending up the bank, as well as slumping. Small tributaries or possibly gullies/rills exist along the watercourse. No pools exist along the bed but there are areas of stagnant water throughout the field site. Dense vegetation within the channel was noted in certain locations during a site visit in 2008. Measurements taken at channel cross sections would indicate that the watercourse at this field site has moderate to minor 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. The presence of bank slumping usually indicates that vegetative roots are too shallow to stabilize the bank. It should be confirmed that the culvert is not constricting the channel and if it is then it should be rebuilt and adequately sized. Projects to prevent and limit further development of rills adjacent to the watercourse should be implemented. Some examples include grassed waterways, chute spillways, tile drainage outlets, and proper tillage and cropping practices (OMAFRA, 1997a, and OMAFRA, 1997b). All recommendations should be discussed with the Drainage Superintendent. 2. Lakeshore Road (CDMa): This section of watercourse is managed as a municipal drain; Casey Drain. It has been channelized and contains few depositional features along the stream bed which indicate little flow diversity within the channel. The width of the buffer zone is small due to residential properties and Sideroad 18 being adjacent to the watercourse. The stream banks are steep but there was little instability found during a site visit in 2008. Wire mesh and small stones were identified along the right bank indicating that some erosion protection measures have been implemented by landowners. Upstream of Lakeshore Road relatively deep unconsolidated sediment is deposited along the channel bed. There are a couple areas where vegetative debris is being thrown onto the bank. This debris will eventually end up in stream which can cause debris jams and impact water quality. Two culverts entering the channel from the roadside ditches are approximately 30cm from the streambed indicating that degradation may be occurring at this field site. The culvert at Lakeshore Road is

LAKE ERIE NORTH SHORE WATERSHED PLAN potentially constricting the channel. Measurements taken at channel cross sections would indicate that the watercourse at this field site is 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. It should be confirmed that the culvert is not constricting the channel and if it is then it needs to be rebuilt and adequately sized. Due to the impact on water quality it is advised that landowners stop throwing vegetated debris over the bank. Monitoring the accumulation of sediment along the channel bed can be done by the use of sediment traps throughout the watercourse. Proper bank protection measures should be installed along the right bank to ensure adequate stabilization. All recommendations should be discussed with the Drainage Superintendent. 3. Sideroad 18 (CDMa-2): This section of watercourse is managed as a municipal drain; Casey Drain. It has been channelized and there are a few point bars and side bars present within the channel. The near bank and riparian vegetation consists predominantly of herbaceous vegetation and therefore habitat and shading over the stream will be negatively impacted No pools exist but there is stagnant water present throughout the field site. Algae and an oily sheen on the water surface were identified throughout the watercourse during a site visit in 2008, as well as dense vegetation within the channel. Small tributaries or possibly gullies/rills exist along the watercourse. Relatively deep unconsolidated sediment is deposited along the channel bed. Bank instability is present in the form of bare soil extending up the bank, undercut banks, and possible slumping. This instability is occurring on both banks which can indicate that widening may be occurring at this field site. Measurements taken at channel cross sections would indicate that the watercourse at this field site is 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. The presence of bank slumping usually indicates that vegetative roots are too shallow to stabilize the bank. Water quality should continue to be monitored in this watershed. Monitoring the accumulation of sediment along the channel bed can be done by the use of sediment traps throughout the watercourse. Projects to prevent and limit further development of rills adjacent to the watercourse should be implemented. Some examples include grassed waterways, chute spillways, tile drainage outlets, and proper tillage and cropping practices (OMAFRA, 1997a, and OMAFRA, 1997b). All recommendations should be discussed with the Drainage Superintendent. 4. Sideroad 18 (CDMb): This section of watercourse is managed as a municipal drain; Casey Drain. It has been channelized and lacks any depositional features along the stream bed which indicate little flow diversity within the channel. The buffer zone is predominantly shrubs and herbaceous vegetation therefore habitat and shading over the watercourse will be impacted. 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. Algae and turbid water were noted during a site visit in 2008. Small tributaries or possibly gullies/rills exist along the watercourse. A failed culvert exists at the road allowance and a debris jam exists upstream of it. Bank erosion is evident along the steep banks of the channel. Bare soil extends up the bank, slumping is occurring, and fracture lines are present at the top of the banks. Measurements taken at channel cross sections would indicate that the watercourse at this field site is moderately entrenched which results in flood waters having limited to no 153

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