Browsing Technical Reports (Water Resources) by Subject "Seneca Lake"
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Water Quality of Seneca Lake 1991-1998The water quality of Seneca Lake has been studied since the early 1900's when secchi disk readings were first taken. At that time, the trophic state of Seneca Lake was classified as oligotrophic; that is, nutrient concentrations and primary production were low and transparency high. Water clarity remained approximately the same up through the early 1930s. In general, by the late 1970s water clarity had decreased, indicating the lake’s trophic status was mesotrophic. Total phosphorus concentrations from the 1970s were into the mesotrophic range. Chlolophyll-a concentrations also illustrate the trend toward more productive waters in Seneca Lake in the early to mid 1970s. Similarly in the early 1970s, the transparency of Seneca Lake had decreased to within the eutrophic range. These low transparency values were observed into the early 1990s. Based on the sampling done by the Seneca County Soil and Water Conservation District in the 1990s, an improvement in water quality of Seneca Lake is suggested – at least at the north end where the samples were taken. Summer total phosphorus levels have decreased and perhaps as a result, phytoplankton levels have decreased slightly as indicated by the decrease in chlorophyll levels. However, it should be noted that the increase in transparency and the decrease in phytoplankton levels may well be the result of the high filtering capacity of the invading zebra mussels into Seneca Lake. The monitoring data do not provide an answer to this question. The trophic status of Seneca Lake is currently best described as oligotrophic. In conclusion, water quality of Seneca Lake appears to have improved since the early 1970s and within the 1991-1998 period of monitoring by the Seneca County Soil and Water Conservation District.
Water Quality Study of the Finger Lakes: Part A: Synoptic Water Quality InvestigationThe purpose of the current study is to conduct such comparative investigations and to assess water quality conditions and trends within the Finger Lakes. The study is composed of two distinct components, Synoptic Water Quality Investigation and Sediment Core Investigation. The Synoptic Water Quality Investigation is designed to assess current limnological conditions, and to evaluate water quality trends within this important set of lakes. This portion of the Study was initiated in 1996 and is continuing at present. The Sediment Core Investigation is designed to assess chemical trends within the Finger Lakes over time. This portion of the Study is designed as a one-time effort, and sample collection occurred between 1997 and 1998.
Water Quality Study of the Finger Lakes: Part B: Sediment Core InvestigationThe purpose of the Sediment Core Investigation is to systematically assess chemical patterns within the Finger Lakes over time. Specific goals of the Study are as follows: 1. Assess spatial variations in chemical patterns between the Finger Lakes, 2. Assess temporal patterns of chemical inputs within each lake, 3. Evaluate chemical levels with respect to sediment quality assessment values, 4. Determine sediment accumulation rates. A second, related study, termed the Synoptic Water Quality Investigation, involves long term synoptic water quality monitoring on each of the lakes and is discussed above (see Part A)