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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 enhance water quality and fish habitat before outletting to Lake Erie watercourses are in part 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 recommendations) areas where the wetness index and soil drainage permit; wetland restoration suitability mapping identifies numerous areas suitable for wetland creation: see map 214 into adjacent subwatershed) 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. Lake Erie Shoreline (BDMa): This section of watercourse is managed as a municipal drain; Bearss Shore Geomorphic Drain. It has been channelized and lacks any depositional features along the bed which indicate little flow Assessment Study (NPCA diversity within the channel. A bank protection structure exists along both sides of the channel near the outlet 2009b) into Lake Erie. Bank instability is present in the form of undercut banks. No pools exist but there is stagnant water present throughout the field site. Algae, a brown film and an oily sheen on the water surface were noted during a site visit in 2008. Measurements taken at channel cross sections 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. Water quality testing should be completed in this watershed to determine any water quality issues. Native vegetation that can stabilize sandy banks should be planted at this field site. Increasing the variety and diversity of native plant species within the buffer zone will provide cover and habitat for fish, insects, and invertebrate along the watercourse. All recommendations should be discussed with the Drainage Superintendent. 2. Wyldewood Road (BDMb): This section of watercourse is managed as a municipal drain; Bearss Drain. It has been channelized but there are some bar formations and small bends throughout the study site. This site is also the only study site that contains riffles along the bed. Relatively deep unconsolidated sediment is deposited along the channel bed. Bank instability is present in the form of bare soil extending up the bank, and undercut banks. The buffer width is small but relatively dense in some areas. A number of small tributaries and possibly rills exist along the watercourse. The culvert at the Friendship Trail may be considered a channel constriction. Measurements taken at channel cross sections 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. This can change the channel geometry overtime due to increased velocity, stream power, and channel slope. Increasing the variety and diversity of native plant species within the buffer zone will provide more stability for the channel banks. 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). Monitoring the accumulation of sediment along the channel bed can be

LAKE ERIE NORTH SHORE WATERSHED PLAN done by the use of sediment traps throughout the watercourse. It should be determined whether the culvert at the Friendship Trail is properly sized. All recommendations should be discussed with the Drainage Superintendent. 3. Firelane Seventeen (BDTa): This section of watercourse is managed as a municipal drain; William- Michael 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 in the form of bare soil extending up the bank and slumping. Relatively deep unconsolidated sediment is deposited along the channel bed. A small crossing over the channel has a blocked culvert on both the upstream and downstream sides which will cause flow problems and deposition upstream. For most of the field site there is no aquatic vegetation present within the channel. A large number of debris jams are present throughout the study site. An oily sheen on the water surface was identified throughout the watercourse during a site visit in 2008. Upstream of the blocked culvert there was also an orangey red mass present within the watercourse. Water quality testing should 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. Debris and rocks should be removed from the culvert so that water can flow through the channel. The crossing should also be properly built and the culvert adequately sized. The presence of bank slumping usually indicates that vegetative roots are too shallow to stabilize the bank. All recommendations should be discussed with the Drainage Superintendent. 4. Highway 3 (BDTb): This section of the watercourse has been channelized and lacks any depositional features along the stream bed which indicate little flow diversity within the channel. The watercourse along this field site is not managed as a municipal drain. There is some bank instability in the form of slumping, undercut banks, and bare soil extending up the bank. The riparian buffer along this site is non-existent along the left bank and therefore habitat and shading over the stream will be impacted. There was a complaint by a landowner due to flooding on adjacent residential property. Dense vegetation exists within the channel, which includes long grasses and cattails. There is also a crossing that contains 3 culverts that may be constricting the flow of water through the channel. The main branch of Bearss Drain is close to this field site and when the channel is flooding there will be flow back-up as the tributary water is entering the main channel. All of these factors are going to influence the flow of water through the channel at this field site. It should be confirmed that the crossing is not constricting the channel and if it is then the crossing should be rebuilt and the culvert adequately sized. Another possibility is to increase the canopy cover over the channel and prevent excessive in-stream vegetation growth. The presence of bank slumping usually indicates that vegetative roots are too shallow to stabilize the bank. Two of the four sites are within the designated municipal drain Bearss Drain and a third site is within the William- Michael Drain. Bank instability is present at all of the field sites and two of the four sites have relatively deep unconsolidated sediment deposited along the channel bed. The possibility of rills/gullies adjacent to the channel was only identified at one field site. Rill prevention measures such as slope re-grading, erosion control blankets, and seeding should be implemented along the adjacent property. Excessive sediment deposition can cause problems in the watercourse, such as lateral channel adjustments, increased turbidity, filling in of pools, and impacting fish habitat. Long term monitoring of sediment accumulation should be completed to avoid any 215

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