Lake Pocotopaug Lake and Watershed Restoration Evaluation ...

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TABLE 21 continued. MANAGEMENT OPTIONS FOR CONTROL OF ALGAEOPTION MODE OF ACTION ADVANTAGES DISADVANTAGESPhysical Controls5.a) “Dry” excavation ♦ Lake drained or lowered tomaximum extent practical♦ Target material dried tomaximum extent possible♦ Conventional excavationequipment used to removesediments5.b) “Wet” excavation ♦ Lake level may be lowered,but sediments notsubstantially exposed♦ Draglines, bucket dredges, orlong-reach backhoes used toremove sediment5.c) Hydraulic removal ♦ Lake level not reduced♦ Suction or cutterheaddredges create slurry which ishydraulically pumped tocontainment area♦ Slurry is dewatered; sedimentretained, water discharged♦♦♦♦♦♦♦♦♦Tends to facilitate a verythorough effortMay allow drying of sedimentsprior to removalAllows use of less specializedequipmentRequires least preparationtime or effort, tends to be leastcost dredging approachMay allow use of easilyacquired equipmentMay preserve aquatic biotaCreates minimal turbidity andimpact on biotaCan allow some lake usesduring dredgingAllows removal with limitedaccess or shorelinedisturbance♦♦♦♦♦♦♦♦♦♦♦Eliminates most aquatic biotaunless a portion left undrainedEliminates lake use duringdredgingUsually creates extreme turbidityTends to result in sedimentdeposition in surrounding areaNormally requires intermediatecontainment area to drysediments prior to haulingMay cause severe disruption ofecological functionUsually eliminates most lakeuses during dredgingOften leaves some sedimentbehindCannot handle coarse or debrisladenmaterialsRequires sophisticated and moreexpensive containment areaRequires overflow dischargefrom containment areaLake Pocotopaug Restoration Evaluation 112May 2002
TABLE 21 continued. MANAGEMENT OPTIONS FOR CONTROL OF ALGAEOPTION MODE OF ACTION ADVANTAGES DISADVANTAGESPhysical Controls6) Light-limiting dyes andsurface covers♦ Creates light limitation ♦ Creates light limit on algalgrowth without high turbidity orgreat depth♦ May achieve some control ofrooted plants as well6.a) Dyes ♦ Water-soluble dye is mixedwith lake water, therebylimiting light penetration andinhibiting algal growth♦ Dyes remain in solution untilwashed out of system.6.b) Surface covers ♦ Opaque sheet materialapplied to water surface7) Mechanical removal ♦ Filtering of pumped water forwater supply purposes♦ Collection of floating scumsor mats with booms, nets, orother devices♦ Continuous or multipleapplications per year usuallyneeded♦♦♦♦♦♦♦Produces appealing colorCreates illusion of greaterdepthMinimizes atmospheric andwildlife pollutant inputsAlgae and associated nutrientscan be removed from systemSurface collection can applyon an “as needed” basisMay remove floating debrisCollected algae dry to minimalvolume♦♦♦♦♦♦♦♦♦♦May cause thermal stratificationin shallow pondsMay facilitate anoxia at sedimentinterface with waterMay not control surface bloomformingspeciesMay not control growth ofshallow water algal matsMinimizes atmospheric gasexchangeLimits recreational useFiltration requires high backwashand sludge handling capabilityfor use with high algal densitiesLabor intensive unless amechanized system applied, inwhich case it is capital intensiveMany algal forms not amenableto collection by net or boomPossible impacts on nontargetedaquatic lifeLake Pocotopaug Restoration Evaluation 113May 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 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 116 and 117: TABLE 21. MANAGEMENT OPTIONS FOR CO
Page 120 and 121: 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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