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 Concentration increases are often seasonally distributed but can be a function of extreme high flow
events when reservoir retention times are greatly reduced. Temporal distribution of nutrients in
tailwaters may be described with observations of total nitrogen and total phosphorus. Total nitrogen
concentrations remain relatively constant (Figure 1.3.19), however the contribution of ammonia and
nitrate concentrations to the total would vary seasonally. During anoxia in the upstream impoundment,
higher ammonia concentrations would
40
30
20
10
0
2.0
1.5
1.0
0.5
0.0
2.0
1.5
1.0
0.5
0.0
1988
1989
1990
1991
1992
Figure 1.3.16 Temporal patterns in total iron and manganese concentrations in a
reservoir tailwater (East Sidney Lake, NY). (Hydrograph provided for reference.)
1.3-20
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