Reservoir Limnology Supports Class A Beneficial and Designated Uses Sample Clauses

Reservoir Limnology Supports Class A Beneficial and Designated Uses. The water quality standards requirements for Class A waterbodies do not have specific numeric criteria regarding nutrients and other limnological characteristics. However, the limnology of the Reservoir is supportive of Class A beneficial and designated uses (clear and clean for recreation, trophic level consistent with cold water aquatic life uses). Parametrix and Xxxxxx (2001) reported that lake enrichment classifications suggest the Reservoir water column would be rated “lower mesotrophic” or on the low end of moderately enriched. The Trophic State Index (TSI) is an indication of the degree of enrichment of a lake using measurements of water transparency (Secchi disk depth), total phosphorus concentrations and chlorophyll-a concentrations during the summer (June to September) months. The TSI rating must be qualified, as the system is more suitable for lakes with longer retention times and turbidity due to plankton, not solids. There are no highly suitable rating systems for mid-Columbia River reservoirs. By TSI component, the Reservoir is oligotrophic with respect to water clarity but mesotrophic with respect to total phosphorus and chlorophyll-a concentrations. This trophic level is consistent with the limnological characteristics of other Columbia River reservoirs. Transparency averaged 6.4 meters (m) in the summer months, steadily increasing from June to September in a pattern seen in other mid-Columbia River reservoirs (Parametrix and Xxxxxx, 2001). Total phosphorus, a widely used indicator of trophic state, averaged 18.7 micrograms per liter (µg/L) at pelagic stations in the summer, and was positively correlated with hourly flow during sampling. Orthophosphate concentrations were minimal year-round, and during the summer averaged only 1.7 µg/L, similar to upstream conditions and below the detection limits of many laboratories. This measure is only a general indicator of trophic state, as phosphorus cycles quickly and true nutrient depletion for algal growth must be determined by other means. Ratios of dissolved inorganic nitrogen to orthophosphate were very high at all times, suggesting the possibility of summer phosphorus limitations to primary productivity and indicating that nitrogen concentrations were relatively high (Parametrix and Xxxxxx, 2001). Parametrix and Xxxxxx (2001) reported that biological productivity in the Reservoir was similar to other mid-Columbia River reservoirs. Chlorophyll-a concentrations ranged from relatively low to mode...
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