Stave River Water Use Plan - BC Hydro

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Stave River Water Use Plan Monitoring Terms of Reference June 13, 2005 2.7 References Carlson, R. E. 1980. More implications in the chlorophyll-Secchi disk relationship. Limnol. Oceanogr. 25:378-382. (Cited in Wetzel 2001) Failing, L. 1999. Stave River Water Use Plan: Report of the consultative committee. Prepared by Compass Resource Management Ltd for BC Hydro. October 1999. 44 p + App. McCauley, E. 1984. The estimation of the abundance and biomass of zooplankton in samples. In: Downing, J.D. and F. H. Rigler (eds). 1984. A Manual on Methods for the Assessment of Secondary Productivity in Fresh Waters – 2nd ed., Blackwell Scientific Publications. Strickland, J. D. H. 1960. Measuring the Production of marine phytoplankton. Bull. J. Fish. Res. Baord Can. 122, 172 p. Stockner, J. G. and J. Beer. 2004. The limnology of Stave/Hayward reservoirs: with a perspective on carbon production. Prepared for BC Hydro Water Use Plans by Eco-logic Ltd. and University of British Columbia, Institute For Resources, Environment and Sustainability, Vancouver. 33 p. + App. Utermohl, H. 1958. Zur Vervollkommnung der quantitativen Phytoplankton methodik. Int. Verein. Limnol. Mitteilungen No. 9. (Cited in Stockner and Beer 2004) Vollenweider, R, A. 1975. Input-outout models, with special refernce to the phosphorus loading concept in limnology. Schweiz. Z. Hydrol. 37:53-84. (Cited in Wetzel 2001) Wetzel, R. G. 2001. Limnology: Lake and River Ecosystems 3 rd Edition. Academic Press. New York. 1006 p. BC Hydro Page 22
Stave River Water Use Plan Monitoring Terms of Reference June 13, 2005 1.0 Program Rationale 1.1 Background 2. Littoral Productivity Assessment During the Stave River Water Use Plan process, the consultative committee (CC) identified the need to study the effects of water level fluctuation on the littoral zone productivity of Hayward and Stave reservoirs. This requirement arose largely from concerns raised by fisheries interests that the littoral zone in Stave reservoir may have been seriously damaged by water level fluctuations. It was further hypothesised that the loss of a fully functional littoral zone could have significantly impacted the overall biological (carbon) production of the ecosystem. These concerns however, were not based on actual measures of impact. From site visits and comparisons to unaltered lake systems, it was clear that the water level fluctuations in Stave Reservoir have had a serious impact on littoral productivity. However, the full extent and nature of the impact remains to be quantified. Also uncertain was how this loss/gain relates to productivity levels of the system as a whole (i.e., to what extent does littoral productive contribute to overall system productivity?). In an attempt to account for this potential loss in system productivity for trade-off analysis purposes, a performance measure was developed that estimates the areal extent of ‘potentially productive’ littoral habitat. The measure, termed the ‘Effective Littoral Zone’ or ELZ, quantifies the area of aquatic shoreline habitat that receives adequate light to promote photosynthetic activity and remains wetted for specified occurrence frequencies. A description of how the measure is calculated can be found in Appendix 2 of the consultative committee report (Failing 1999). Although the ELZ performance measure was used during the development of the WUP, its accuracy as a measure of productive littoral habitat remains untested. The Stave River generation complex provides a unique opportunity to test the utility of ELZ measure. The complex consists of three reservoirs, two of which have highly variable water levels, while the other is kept relatively stable. The contrast in operation between reservoirs allows one to compare ELZ predictions with empirical data collected under differing degrees of reservoir stability. The loss of the littoral zone was deemed to be an extremely important issue by the CC. However, decisions made about reservoir operations in the WUP were based on an untested measure of this loss. As a result, a comprehensive study of littoral zone impacts, and the ELZ measure used to quantify it, was deemed an essential component of the WUP. The results of the study would be used in future Stave River WUPs to clarify the issues surrounding this loss of littoral zone productivity. It may also lead to the development of a littoral zone productivity performance measure that could be transferable to other BCH facility WUPs. At the conclusion of the WUP process, the CC reached a consensus to adopt the Combo 6 operating strategy as the preferred alternative for the next ten years (Failing 1999). One of the reasons the alternative was chosen was because of the expected BC Hydro Page 23
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Stave River Water Use Plan - BC Hydro

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