Lake Pocotopaug Lake and Watershed Restoration Evaluation ...

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TABLE 21. MANAGEMENT OPTIONS FOR CONTROL OF ALGAEOPTION MODE OF ACTION ADVANTAGES DISADVANTAGESPhysical Controls1) Hypolimnetic aeration oroxygenation2) Circulation anddestratification♦♦♦♦♦♦Addition of air or oxygen atvarying depth provides oxicconditionsMay maintain or breakstratificationCan also withdraw water,oxygenate, then replaceUse of water or air to keepwater in motionIntended to prevent or breakstratificationGenerally driven bymechanical or pneumaticforce3) Dilution and flushing ♦ Addition of water of betterquality can dilute nutrients♦ Addition of water of similar orpoorer quality flushes systemto minimize algal build-up♦ May have continuous orperiodic additions♦ Oxic conditions promotebinding/sedimentation ofphosphorus♦ Counteraction of anoxiaimproves habitat forfish/invertebratesBuild-up of dissolved iron,manganese, ammonia andphosphorus reduced♦ Reduces surface build-up ofalgal scums♦ Promotes uniform appearance♦ Counteraction of anoxiaimproves habitat forfish/invertebrates♦ Can eliminate localizedproblems without obviousimpact on whole lake♦ Dilution reduces nutrientconcentrations without alteringload♦ Flushing minimizes detention;response to pollutants may bereduced♦♦♦♦♦♦♦♦♦May disrupt thermal layersimportant to fish communityMay promote supersaturationwith gases harmful to fishMay spread localized impactsMay increase oxygen demand atgreater depthsMay promote downstreamimpactsDiverts water from other usesFlushing may wash desirablezooplankton from lakeUse of poorer quality waterincreases loadsPossible downstream impactsLake Pocotopaug Restoration Evaluation 110May 2002
TABLE 21 continued. MANAGEMENT OPTIONS FOR CONTROL OF ALGAEOPTION MODE OF ACTION ADVANTAGES DISADVANTAGESPhysical Controls4) Drawdown ♦ Lowering of water overautumn period allowsoxidation, desiccation andcompaction of sediments♦ Duration of exposure anddegree of dewatering ofexposed areas are important♦ Algae are affected mainly byreduction in availablenutrients.5) Dredging ♦ Sediment is physicallyremoved by wet or dryexcavation, with deposition ina containment area fordewatering♦ Dredging can be applied on alimited basis, but is mostoften a major restructuring ofa severely impacted system♦ Nutrient reserves areremoved and algal growthcan be limited by nutrientavailability♦♦♦♦♦♦♦♦♦♦May reduce available nutrientsor nutrient ratios, affectingalgal biomass and compositionOpportunity for shorelineclean-up/structure repairFlood control utilityMay provide rooted plantcontrol as wellCan control algae if internalrecycling is main nutrientsourceIncreases water depthCan reduce pollutant reservesCan reduce sediment oxygendemandCan improve spawning habitatfor many fish speciesAllows complete renovation ofaquatic ecosystem♦♦♦♦♦♦♦♦♦♦♦♦♦Possible impacts on contiguousemergent wetlandsPossible effects on overwinteringreptiles or amphibiansPossible impairment of wellproductionReduction in potential watersupply and fire fighting capacityAlteration of downstream flowsPossible overwinter water levelvariationMay result in greater nutrientavailability if flushing inadequateTemporarily removes benthicinvertebratesMay create turbidityMay eliminate fish community(complete dry dredging only)Possible impacts fromcontainment area dischargePossible impacts from dredgedmaterial disposalInterference with recreation orother uses during dredgingLake Pocotopaug Restoration Evaluation 111May 2002
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LAKE POCOTOPAUGLAKE AND WATERSHEDRE
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11.3 Prevent algal blooms from occu
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LAYPERSON’S SYNOPSISLake Pocotopa
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The stocking of walleye in Lake Poc
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Lake Pocotopaug Restoration Evaluat
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Period Covered 1988• Pollution fr
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Recommendations included• Algacid
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Major EventDecember 1999 - Fish kil
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Table 5. Land Use from the CT DEP G
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Figure 4. Lake Pocotopaug Bathymetr
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Table 6. QA/QC on Water Quality Dat
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Soils - USDA at MAGIC UCONN Geograp
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Table 8. Water Quality Variables Me
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Phytoplankton samples were collecte
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where many measurements would have
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Figure 7. 2001 Temperature and Diss
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Table 10 continued. 2001 Lake Pocot
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phytoplankton biomass (Wetzel 1983)
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Figure 9. Annual June, July and Aug
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elow 7:1 occurred on September 22,
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Table 12. 2001 Dry and Wet Weather
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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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Page 66 and 67: Table 14 continued. 2001 Phytoplank
Page 68 and 69: Figure 10. 2001 Phytoplankton Bioma
Page 70 and 71: The late summer bloom of blue-green
Page 72 and 73: Table 15. 2001 Zooplankton DensityZ
Page 74 and 75: Table 16. 2001 Zooplankton BiomassZ
Page 76 and 77: 7.0 RELATIONSHIPS AND TRENDS7.1 Pre
Page 78 and 79: Figure 13. 1991-2001 Surface Water
Page 80 and 81: Figure 15. 2001 Surface and Mid-dep
Page 82 and 83: Figure 16. 1991-2001 Chlorophyll a
Page 84 and 85: Figure 18. 2001 Chlorophyll a vs. S
Page 86 and 87: Figure 20. 1991-2001 July and Augus
Page 88 and 89: Table 17. Empirical Model Calculati
Page 90 and 91: Table 18. Total Phosphorus Loading
Page 92 and 93: Table 19. Wet Weather Loading Summa
Page 94 and 95: With the best possible treatment of
Page 96 and 97: water quality should focus on input
Page 98 and 99: 10.0 MANAGEMENT NEEDS AND OBJECTIVE
Page 100 and 101: 11.2 Reducing Total Phosphorus and
Page 102 and 103: undeveloped forest land, an opportu
Page 104 and 105: Figure 22. Buffer Strips for Pollut
Page 106 and 107: Figure 23. Catch Basin with Sump an
Page 108 and 109: early spring to capture what appear
Page 110 and 111: Figure 26. Infiltration Systems.Lak
Page 112 and 113: Figure 27. Constructed Treatment We
Page 114 and 115: Chemical TreatmentIn-stream chemica
Page 118 and 119: TABLE 21 continued. MANAGEMENT OPTI
Page 130 and 131: 12.0 ADDITIONAL DATA NEEDSManagemen
Page 132 and 133: 13.0 RECOMMENDED MANAGEMENT PROGRAM
Page 134 and 135: this point, but as a rough guide, a
Page 136 and 137: 14.0 REFERENCESAd Hoc Lake Advisory
Page 138 and 139: Scheuler T.R., P.A. Kumble, & M.A.
Page 140 and 141: Appendix B:Supplemental Tables and
Page 142: Appendix D:Educational MaterialsLak
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Lake Pocotopaug Lake and Watershed Restoration Evaluation ...

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