Lake Pocotopaug Lake and Watershed Restoration Evaluation ...

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Period Covered 1988• Pollution from the sub-division continued, although an abatement order was issued• A reported “oil slick” on the lake was determined to be a diatom bloom of Asterionellaand TabellariaPeriod Covered 1989• Pollution from Baker Hill sub-division continued to be documentedPeriod Covered 1990• A severe algal bloom occurred in late summer and fall (SDT
Period Covered 1992-1993Fugro-McClelland, Inc (Fugro) prepared a Diagnostic and Management Study (D/M) forLake Pocotopaug. The results of seven sampling events from December 1992 untilSeptember 1993 were summarized, and management recommendations were provided.The report compared 1992-1993 sampling results to previous studies. Water clarity wasgreater in 1993 in comparison to 1991-1992. An algal bloom in July did not occur.However, an algal bloom did occur in September. Dominant algae were Staurastrumand Anabaena. It was hypothesized that September blooms were the result of increasephosphorus released from the sediment during periods of anoxia. Differences in meanphosphorus concentrations from 1993 to 1991-1992 could not be made due to aquestionable laboratory measurement reported in 1993. Median surface values forammonium nitrogen and nitrate nitrogen were comparable to 1991-1992 values. Mediansurface organic nitrogen concentrations were higher in 1992-1993 than in 1991-1992.Median SDT was lower in 1991-1992. Median turbidity values were higher in 1991-1992than in 1992-1993. A hydrologic budget was prepared and is provided in Table 3.A phosphorus loading analysis was performed based previous values presented in anunpublished work titled “Land Use and Phosphorus Input to Lake Pocotopaug” by theAHLAC, Land Use Subcommittee. This report was later published in 1995. Resultsfrom the Fugro analysis are provided below.Areal Phosphorus Loading 1263 lbs/yr (0.277 g/m 2 yr) 53% of totalIncludes watershed, waterfowl, and atmosphereInternal Loading 1099 lbs/yr (0.518 g/m 2 yr) 47% of totalTable 3. Diagnostic and Management Study Hydrologic Budget (Adapted fromFugro 1993).Inputsa) Watershed runoff 6.63 x 10 6 m 3b) Direct Precipitation 2.489 x 10 6 m 3Lossesa) Outlet 7.647 x 10 6 m 3b) Evaporation 1.472 x 10 6 m 3Residence TimeFlushing Rate0.78 years1.3 volumes/year(Assumed no negligible inputs or losses of groundwater and no change in storage volume)Information from this study was used for portions of the ENSR phosphorus loadinganalysis.Lake Pocotopaug Restoration Evaluation 7May 2002
Page 2 and 3: LAKE POCOTOPAUGLAKE AND WATERSHEDRE
Page 4 and 5: 11.3 Prevent algal blooms from occu
Page 6 and 7: LAYPERSON’S SYNOPSISLake Pocotopa
Page 8 and 9: The stocking of walleye in Lake Poc
Page 10 and 11: Lake Pocotopaug Restoration Evaluat
Page 14 and 15: Recommendations included• Algacid
Page 16 and 17: Major EventDecember 1999 - Fish kil
Page 18 and 19: Table 5. Land Use from the CT DEP G
Page 22 and 23: Figure 4. Lake Pocotopaug Bathymetr
Page 24 and 25: Table 6. QA/QC on Water Quality Dat
Page 26 and 27: Soils - USDA at MAGIC UCONN Geograp
Page 28 and 29: Table 8. Water Quality Variables Me
Page 32 and 33: Phytoplankton samples were collecte
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Page 36 and 37: Figure 7. 2001 Temperature and Diss
Page 38 and 39: Table 10 continued. 2001 Lake Pocot
Page 40 and 41: phytoplankton biomass (Wetzel 1983)
Page 42 and 43: Figure 9. Annual June, July and Aug
Page 44 and 45: elow 7:1 occurred on September 22,
Page 46 and 47: Table 12. 2001 Dry and Wet Weather
Page 48 and 49: Table 12 continued. 2001 Dry and We
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Page 58 and 59: Table 13 continued. 2001 Phytoplank
Page 60 and 61: Table 13 continued. 2001 Phytoplank
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Table 13 continued. 2001 Phytoplank
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Figure 10. 2001 Phytoplankton Bioma
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The late summer bloom of blue-green
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Table 15. 2001 Zooplankton DensityZ
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Table 16. 2001 Zooplankton BiomassZ
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7.0 RELATIONSHIPS AND TRENDS7.1 Pre
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Figure 13. 1991-2001 Surface Water
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Figure 15. 2001 Surface and Mid-dep
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Figure 16. 1991-2001 Chlorophyll a
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Figure 18. 2001 Chlorophyll a vs. S
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Figure 20. 1991-2001 July and Augus
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Table 17. Empirical Model Calculati
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Table 18. Total Phosphorus Loading
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Table 19. Wet Weather Loading Summa
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With the best possible treatment of
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water quality should focus on input
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10.0 MANAGEMENT NEEDS AND OBJECTIVE
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11.2 Reducing Total Phosphorus and
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undeveloped forest land, an opportu
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Figure 22. Buffer Strips for Pollut
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Figure 23. Catch Basin with Sump an
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early spring to capture what appear
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Figure 26. Infiltration Systems.Lak
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Figure 27. Constructed Treatment We
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Chemical TreatmentIn-stream chemica
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TABLE 21. MANAGEMENT OPTIONS FOR CO
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TABLE 21 continued. MANAGEMENT OPTI
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12.0 ADDITIONAL DATA NEEDSManagemen
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13.0 RECOMMENDED MANAGEMENT PROGRAM
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this point, but as a rough guide, a
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14.0 REFERENCESAd Hoc Lake Advisory
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Scheuler T.R., P.A. Kumble, & M.A.
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Appendix B:Supplemental Tables and
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Appendix D:Educational MaterialsLak
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