Falls River Project Water Use Plan Falls River Fish ... - BC Hydro

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Falls River WUP Monitoring 2008/2009 3.2 Intragravel Physicochemical Parameters Groundwater/stream-water exchanges in gravel and cobble beds have been found to relate to the selection of fish spawning habitat (Geist and Dauble 1998; Baxter and McPhail 1999; Baxter and Hauer 2000; Geist 2000; Geist et al. 2002; Baxter et al. 2002; and Douglas, 2006). The zone of interaction between to the two water sources forms a volume of saturated sediment called the hyporheic zone (Edwards 1998), which varies between systems dependent upon the extent of groundwater and surface water in the system. In this study, water from the hyporheic zone was sampled from 9 sample sites (marked with installed piezometers) located within two potential incubation areas and one control area. Figure 10 displays the incubation areas and location of the sample sites/piezometer markers. A metal sampling syringe was used in place of sampling from the piezometers (as discussed in methods) and was utilized throughout the sampling period at all sample sites. Water depth, average velocity, tidal information, and sample time (gathered during the sampling period September 23 rd , 2008 to May 15 th , 2009) are presented in table 5. Physicochemical parameters (dissolved oxygen, temperature, pH, conductivity) measured at all sample site locations are presented in Table 6. Due to the proximity of site H to site G, physicochemical data sampled from G were used for H. Table 5: Water depth (m) and velocity (m/s) at each sample site location. 27-Oct-08 (time =18:30) Tide range (m) : 1.8 – 3.0 19-Feb-09 (time = 14:30) Tide range (m): 2.5 – 3.0 12-May-09 (time = 14:15) Tide range (m): 2.7 – 3.0 Site Depth (m) Avg. velocity Depth (m) Avg. velocity Depth (m) Avg. velocity 1 A 0.65 0.113 0.52 0.094 0.92 0.344 1 B 0.63 0.129 0.48 0.113 0.90 0.393 1 C 0.57 0.133 0.43 0.109 0.85 0.389 2 D 0.41 0.299 0.21 0.218 0.67 0.381 2 E 0.36 0.189 0.17 0.156 0.66 0.431 2 F 0.40 0.164 0.22 0.125 0.69 0.381 2 G 0.41 0.163 0.21 0.148 0.70 0.419 2 H 0.41 0.166 n/a n/a n/a n/a Control X 0.35 0.096 n/a n/a n/a n/a Cambria Gordon and Metlakata Fisheries 19
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Falls River Project Water Use Plan Falls River Fish ... - BC Hydro

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