Thompson Creek Flood Study Report - City of Peterborough

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Thompson Creek Detailed Flood Reduction Study City of Peterborough under the road via a concrete box culvert. Reach 3 originates at Armour Road and flows in a southwesterly direction eventually discharging into the Otonabee River 300 m west of Armour Road. Fish community investigations resulted in the capture of a warmwater fish community consisting of 11 species including seven baitfish species, two panfish species and two game fish species. Aquatic habitat in the creek consists of a combination of beaver ponds and natural channel that flows through a combination of forested and open field habitats. A large beaver pond is located approximately 250 m downstream of the Trent Canal dam that consists of a combination of lentic and shallow littoral habitats. 3.3.1.1 Data Collection Methodology Prior to conducting fish community investigations in Thompson Creek, a Licence to Collect Fish for Scientific Purposes (Licence No.1032442) was obtained from the Ministry of Natural Resources (MNR). Fish community investigations were conducted in Thompson Creek during June and July 2006 using a combination of minnow traps, pot traps and a backpack electrofisher. As per the conditions set forth in the Licence to Collect Fish for Scientific Purposes minnow traps were used to sample the fish community during June 2006 to minimize impacts to spawning fish. A backpack electrofisher (Smith-Root model 15D set to 400 volts, 60-80 Hz) was used in July to sample four locations that consisted of a 40 m length of stream using a single pass method. All available habitats within the 40 m reach were sampled to obtain an accurate representation of the fish community at each station. Minnow and pot traps were also used during the July investigations to sample deeper habitats in the large beaver pond and smaller beaver ponds located downstream. Traps were set in the vicinity of cover (aquatic vegetation, woody debris) and/or at the boundary between two vegetation communities (i.e. floating aquatic vegetation and submergent vegetation communities) for a period of 24 hours. All fish captured were recorded on field collection data sheets and released unharmed into the watercourse. A general inventory of the habitat attributes along the entire length of Thompson Creek was completed during the June field investigations. Attributes including general habitat features and average channel width were recorded during the investigations. A detailed inventory of the aquatic habitat conditions was conducted at each of the stations sampled using a backpack electrofisher during the July investigations. Water quality parameters including water temperature, total dissolved solids (TDS), conductivity, pH and dissolved oxygen (DO) were recorded at each station. Water temperature, TDS, conductivity and pH were measured using a Hanna Instruments HI98129 multimeter and DO was measured using an Extech Instruments Waterproof Exstik II Dissolved Oxygen Meter. Physical habitat features including channel morphology (percent pools, 14-06605-01-W01 City of Peterborough 16
Thompson Creek Detailed Flood Reduction Study City of Peterborough riffles, runs), substrate composition, presence of barriers, percent canopy cover, riparian vegetation community, water clarity, and presence of aquatic vegetation was recorded for each station. The 40 m sample reaches were then divided into 5 transects, each 10 m apart and then subdivided into 5 points equally spaced across the channel based upon bankfull width at the transect. Data recorded at each transect includes bankfull width, wetted width, water depth measured at each point and dominant substrate. 3.3.1.2 Summary and Conclusions re. Fisheries A detailed description of the fish communities and fish habitat by Reach is presented in Appendix D. These should be considered in the impact assessment of any flood protection alternatives that directly affect the creek. The following provides a summary of the findings. The fish community captured in Thompson Creek indicates that the creek functions as warmwater habitat. Although coolwater species are present, these species are tolerant of a wide thermal range and are commonly captured in warmwater habitats. The presence of blackchin shiner indicates that the creek has clear water and good water quality as it is intolerant to turbidity and pollution. Top predator species including largemouth bass, rock bass and smallmouth bass were captured at many of the sampling stations indicating that Thompson Creek can support these species. The presence of YOY rock bass and largemouth bass indicates that the slow moving, well vegetated areas are functioning as nursery habitat for these species. There is likely a reproducing population of these species in the creek as the dense submergent vegetation and coarse substrate provides suitable spawning habitat for these fish. Furthermore, adult Centrarchid species were observed in suitable spawning habitat during June investigations suggesting they were spawning. Upstream of Armour Road, in-water cover is abundant providing refuge areas and potential nursery habitat for the fish community captured during investigations. Downstream of Armour Road, in-water cover is reduced and the lack of submergent vegetation is likely the result of canopy cover increasing in density along this reach. Although in-water cover in Reach 3 is not as dense as the remainder of the creek, a similar fish community was captured in the reach. The presence of a similar fish community within Thompson Creek suggests that water quality and habitat conditions are similar throughout the creek. 14-06605-01-W01 City of Peterborough 17
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LEGEND EXISTING CATCHBASIN LOCATION
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Thompson Creek Flood Study Report - City of Peterborough

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