Lake Pocotopaug Lake and Watershed Restoration Evaluation ...

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11.3 Prevent algal blooms from occurring and maximize water clarity.................................108TABLE OF CONTENTS CONTINUED12.0 ADDITIONAL DATA NEEDS ............................................................................................12412.1 In-Lake Monitoring........................................................................................................12412.2 Watershed Input Monitoring .........................................................................................12412.3 Additional Algal Monitoring...........................................................................................12412.4 Additional Investigative Sampling.................................................................................12512.5 Algal Assays.................................................................................................................12512.6 Fish Assays ..................................................................................................................12513.0 RECOMMENDED MANAGEMENT PROGRAM..............................................................12613.1 Source Controls.............................................................................................................12613.2 Transport Mitigation.......................................................................................................12713.3 In-Lake Actions..............................................................................................................12814.0 REFERENCES ................................................................................................................130LIST OF TABLESTable 1. Mean Lake Pocotopaug Water Quality in 1973, 1974, 1979, and 1980................ 5Table 2. Median Lake Pocotopaug Water Quality 1973, 1974, 1979, and 1980................. 6Table 3. Diagnostic and Management Assessment Hydrologic Budget.............................. 7Table 4. Summary of Volunteer Lake Study Group Data. ................................................. 11Table 5 Land Use from the CT DEP GIS and VLSG........................................................ 12Table 6. QA/QC on Water Quality Data............................................................................. 18Table 7. Laboratory Percent Error during the 2001 Lake Pocotopaug Investigation......... 18Table 8. Water Quality Variables Measured in Lake Pocotopaug..................................... 22Table 9. ENSR and VLSG Tributary and Storm Drain Sampling Station Identifier,Description and Drainage Areas. ........................................................................ 25Table 10. 2001 Lake Pocotopaug In-lake Data Summary................................................... 31Table 11. Lake Pocotopaug July and August Range of Annual Means and Water QualityStandards for Mesotrophic Lakes in Connecticut................................................ 38Table 12. 2001 Dry and Wet Weather Tributary and Storm Drain Data. ............................. 40Table 13. 2001 Phytoplankton Density................................................................................ 51Table 14. 2001 Phytoplankton Biomass.............................................................................. 59Table 15. 2001 Zooplankton Density................................................................................... 66Table 16. 2001 Zooplankton Biomass................................................................................. 68Table 17. Empirical Model Calculations using Lake Pocotopaug TP Range....................... 82Table 18. Total Phosphorus Loading Estimates.................................................................. 84Table 19. Wet Weather Loading Summary for 2001 Data................................................... 86Table 20. Relative Wet Weather Total Phosphorus Loading............................................... 87Table 21. Management Options for Control of Algae. ....................................................... 110
TABLE OF CONTENTS CONTINUEDLIST OF FIGURESFigure 1. Lake Pocotopaug Watershed ................................................................................ 4Figure 2. Lake Pocotopaug Watershed Land Use.............................................................. 13Figure 3. Lake Pocotopaug Watershed Soils. ................................................................... 14Figure 4. Lake Pocotopaug Bathymetry (Frink and Norvell 1984)...................................... 16Figure 5. Illustration of a Passive Surface Water Sampler for sampling the “First Flush” ofStorm-related Flow. ............................................................................................. 20Figure 6. Lake Pocotopaug Watershed 2001 Sampling Locations..................................... 24Figure 7. 2001 Temperature and Dissolved Oxygen Profiles............................................. 30Figure 8. Annual Total Phosphorus from 1991-2001.......................................................... 35Figure 9. Annual June, July and August Total Phosphorus................................................ 36Figure 10. 2001 Phytoplankton Biomass for LP-1. ............................................................... 62Figure 11. 2001 Phytoplankton Biomass for LP-2. ............................................................... 63Figure 12. Average Surface July and August Chlorophyll a vs. 30 Days of Precipitation..... 71Figure 13. 1991-2001 Surface Water Phosphorus vs. Secchi Disk Transparency............... 72Figure 14. 2001 Surface Water Phosphorus vs. Secchi Disk Transparency........................ 73Figure 15. 2001 Surface and Mid-depth Phosphorus vs. Secchi Disk Transparency........... 74Figure 16. 1991-2001 Chlorophyll a vs. Secchi Disk Transparency..................................... 76Figure 17. 1991-2001 July and August Chlorophyll a vs. Secchi Disk Transparency. ......... 77Figure 18. 2001 Chlorophyll a vs. Secchi Disk Transparency. ............................................. 78Figure 19. 1991-2001 Surface Total Phosphorus vs. Chlorophyll a. ....................................79Figure 20. 1991-2001 July and August Surface Total Phosphorus vs. Chlorophyll a.......... 80Figure 21. 2001 Surface Total Phosphorus vs. Chlorophyll a. ............................................. 81Figure 22. Buffer Strips for Pollutant Transport Mitigation.................................................... 98Figure 23. Catch Basin with Sump and Hood..................................................................... 100Figure 24. Oil and Grit Traps. ............................................................................................. 101Figure 25. Detention Systems. ........................................................................................... 103Figure 26. Infiltration Systems. ........................................................................................... 104Figure 27. Constructed Treatment Wetlands...................................................................... 106Figure 28. Water Quality Improvement Swales .................................................................. 107APPENDICESAppendix A: Analysis of Phosphorus InactivationAppendix B: Supplemental Tables and Figures.Appendix C: WMC 1995 Stormwater Renovation and Management PlanAppendix D: Educational Materials
Page 2 and 3: LAKE POCOTOPAUGLAKE AND WATERSHEDRE
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 12 and 13: Period Covered 1988• Pollution fr
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
Page 34 and 35: where many measurements would have
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
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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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Table 12 continued. 2001 Dry and We
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were identified to genus and enumer
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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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