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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 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. 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). The failed culvert should be replaced with a properly sized culvert. All recommendations should be discussed with the Drainage Superintendent. 5. Sideroad 18 (CDTa): This section of watercourse is managed as a municipal drain; Casey Drain East Branch. It has been channelized and there are a few point bars and mid channel bars present within the channel. The presence of algae was noted throughout the field site during a site visit in 2008. Relatively deep unconsolidated sediment is deposited along the channel bed. Few to no pools are present along the bed but there is stagnant water throughout the field site. The buffer zone is predominantly shrubs and herbaceous vegetation therefore habitat and shading over the watercourse will be impacted. Small tributaries or possibly gullies/rills exist along the watercourse. Bank instability is present on both sides of the channel in the form of bare soil extending up the bank, and slumping. 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. 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 done by the use of sediment traps throughout the watercourse. All recommendations should be discussed with the Drainage Superintendent. 6. Burnaby Road (CDTa-2): This section of watercourse is managed as a municipal drain; Casey Drain East Branch. It has been channelized and lacks any depositional features along the stream bed which indicate little flow diversity within the channel. Large stones and concrete pieces are laid along a section of the left bank indicating that some erosion protection measures have been implemented by the landowner. The presence of algae was noted throughout the field site during a site visit in 2008. Relatively deep unconsolidated sediment is deposited along the channel bed. Few to no pools are present along the bed but there is stagnant water throughout the field site. Small tributaries or possibly gullies/rills exist along the watercourse. The small buffer and the lack of large woody vegetation adjacent to the channel results in little canopy cover and habitat. Bank instability is present on both sides of the channel in the form of slumping. 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 154

LAKE ERIE NORTH SHORE WATERSHED PLAN presence of bank slumping usually indicates that vegetative roots are too shallow to stabilize the bank. A vegetative buffer will also provide a filter for sediment and chemicals that may enter the channel from runoff of fields and roads. 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). Proper bank protection measures should be installed along the bank to ensure adequate stabilization. All recommendations should be discussed with the Drainage Superintendent. All of the field sites are within designated municipal drains (Casey Drain North Branch, Casey Drain, and Casey Drain East Branch). Bank instability and relatively deep unconsolidated sediment was identified at the majority of the field sites. The majority of the sites also have small tributaries or possibly gullies/rills along the watercourse. Rill prevention measures such as slope re-grading, erosion control blankets, and seeding should be implemented along the adjacent properties. 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 potential problems and can be done by the use of sediment traps. Water quality should continue to be monitored in this watershed. The degree of entrenchment varies at all of the field sites from minor to complete entrenchment. This means that flood waters will have little to no access to the floodplain. Confining the flood waters to the channel results in the loss of the adjacent floodplain, which impacts the hydraulic function of the watercourse (floodplains are storage areas for flood waters) and the physical habitat (loss of floodplain vegetation and the organisms that live there). It will also change the channel geometry overtime due to increased velocity, stream power, and channel slope. Alternatives to traditional drainage design, such as wetland creation, floodplain development, and increasing channel curvature should also be considered. 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. Three of the field sites along this watercourse potentially contain culverts that may constrict the channel. This can cause problems in the watercourse and therefore the culverts should be measured and replaced if necessary. All recommendations should be discussed with the Drainage Superintendent. Naturalizing Drains and Drain Best Management Practices Promote Good Shoreline Stewardship Integrated Roadside Vegetation Management In addition to having an impact on aquatic and riparian habitat, drain maintenance has the potential to become quite costly through repeated maintenance activities. Naturalizing drains can potentially lengthen the time between maintenance events by reducing the amount of sediment entering and remaining in the drain. Best Management Practices for drain maintenance should be developed in consultation with, but not limited to, the following agencies; OMAFRA, DFO, MNR, Conservation Ontario, OFA, DSAO, CFFO, and the agricultural community to reduce ecological impacts to aquatic systems and to prevent sediment from returning to the drain. Any future maintenance of this watercourse should be done in accordance with Best Management Practices for drains. To review examples of current BMP mitigation measures, refer to Appendix I. Work with partnering stakeholders to promote shoreline that have been maintained naturally or restored to find a balance between natural processes and shoreline protection measures. Niagara Region and municipalities should work together to expand Niagara Region‟s IRVM Program. IRVM integrates the use of native vegetation with appropriate management techniques to produce a cost-effective, 155

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