Lake Pocotopaug Lake and Watershed Restoration Evaluation ...

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Recommendations included• Algacide treatment for short-term relief• Phosphorus inactivation treatment of alum (aluminum sulfate)• Aeration• Biomanipulation to supplement other techniques• Watershed Management – specifically altering the small pool in Hales Brookto function as a sediment basin and follow through with the recommendationsset forth by the Land Use Subcommittee of the Lake Advisory Committee.The AHLAC document was still in preparation at the time of the Diagnosticand Management Study completion.Publication: WMC Consulting Engineers (1995)Period Covered 1995A Stormwater Renovation and Management Study was conducted to• Document existing conditions of the stormwater drainage system around LakePocotopaug,• Review current regulations and ordinances, and• Recommend improvements and control measures to reduce sediment, nutrientand pollutant loading.The Stormwater Renovation and Management Study provides an inventory of theexisting drainage systems and a list of areas requiring improvement. ENSR agrees withtheir recommendation although the recommendations are focused more on sedimentremoval and flood control than phosphorus. The same principles for sediment removal,however, often apply to phosphorus reduction. Specific recommendations regardingphosphorus removal are provided in Section 11 of this report.Publication: Ad Hoc Lake Advisory Committee (1995)Period Covered –multiple years (phosphorus data from 1991-1992, zoning data from1989, etc.)Three reports were published in 1995 by the Ad Hoc Lake Advisory Committee1. Land Use and Phosphorus Input to Lake Pocotopaug2. Taxes and Water Quality3. Lake Pocotopaug Management RecommendationsLand Use and Phosphorus Input to Lake PocotopaugThe land use and phosphorus report:• uses simple phosphorus loading and transparency models to demonstrateanthropogenic impacts to the lake,• uses the models to predict trends in relation to changing land use, and• suggests land use changes to reduce watershed impacts to the lakeLake Pocotopaug Restoration Evaluation 8May 2002
The estimated phosphorus loading was as follows:61% from the watershed (791 lbs/yr)35% from the atmosphere (455 lbs/yr)4 % from waterfowl (43 lbs/yr)The phosphorus export value predicted for the future was 1,817 lbs/yr, resulting in aspring in-lake mean TP concentration of 31 ug/L. Predicted water transparency was 0.6meters. Values in this report were used in ENSR calculations and for comparisonpurposes.Taxes and Water QualityThe “Taxes and Water Quality” report pointed out that taxpayers with large quantities ofundeveloped land (> 15 ac) were paying substantially more (72% more) in taxes thanprior to 1991. The concern is that this increase would promote the development of openspace land. Potential future development will substantially increase phosphorus loadingto Lake Pocotopaug. An assessment of the applicability of the Open Space Provision ofthe Public Act 490 was made. The Open Space Provision, which is an optionalcomponent of the Public Act 490, would provide tax relief to open space landowners asdefined in a the planning commissions “Plan of Development”. Modification of thecurrent “Plan of Development” to include additional open space in Lake Pocotopaug’swatershed to be eligible for tax relief was recommended by the AHLAC, with hopes thatthis would discourage the development of open space.Lake Pocotopaug Management RecommendationsThe Lake Pocotopaug Management Recommendation report was prepared to “1),reduce current inputs of eutrophication causing material to the lake, and 2), minimizefuture increases from future land use changes in the lake basin.” Three basicrecommendations were outlined:1. Develop a Lake Advisory Committee devoted to develop and implementwater quality improvement programs,2. Reduce nutrient and sediment inputs from the watershed through bestmanagement practices and reduce internal nutrient recycling, and3. Develop and implement land use controls to reduce nutrient and sedimentinputsEach of these recommendations was described in detail within the report. ENSR agreeswith their recommendations.Lake Pocotopaug Restoration Evaluation 9May 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 12 and 13: Period Covered 1988• Pollution fr
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
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
Page 56 and 57: were identified to genus and enumer
Page 58 and 59: Table 13 continued. 2001 Phytoplank
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Table 13 continued. 2001 Phytoplank
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Table 14 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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