Loading...
HomeMy WebLinkAboutMassachusetts Estuaries Project August 10, 2011 Presentation_20140123091640401211Massachusetts Estuaries ProjectMassachusetts Estuaries Project Estuarine Restoration and ManagementEstuarine Restoration and ManagementOverview:Overview:Nitrogen Loading & Nitrogen Loading & Management Thresholds Management Thresholds Madaket & Nantucket Harbors Madaket & Nantucket Harbors MEP Technical Team: MEP Technical Team: B.L. B.L. Howes, E.M. Eichner, R.I. Samimy, Howes, E.M. Eichner, R.I. Samimy, D.R. Schlezinger, S. Kelley, R. Acker, J. S. RamseyD.R. Schlezinger, S. Kelley, R. Acker, J. S. RamseyTown of NantucketTown of NantucketBoard of Selectmen WorkshopBoard of Selectmen WorkshopAugust 10, 2011August 10, 2011 22Town of Nantucket Town of Nantucket partnership with partnership with Massachusetts Estuaries Project Massachusetts Estuaries Project •• Nantucket Harbor: N Threshold Nantucket Harbor: N Threshold –– CompleteComplete•• Madaket Harbor: N Threshold Madaket Harbor: N Threshold –– CompleteComplete•• Long Pond: N Threshold Long Pond: N Threshold -- Complete Complete •• SesachachaSesachacha Pond: N Threshold Pond: N Threshold –– CompleteComplete•• Hummock Pond: N Threshold Hummock Pond: N Threshold -- ????•• Nantucket Harbor: Bacterial AssessmentNantucket Harbor: Bacterial Assessment•• Sesachacha Sesachacha Pond: Bacterial AssessmentPond: Bacterial Assessment 33Linked WatershedLinked Watershed--Embayment Management Embayment Management Modeling Approach used for MEPModeling Approach used for MEPManagement AspectsManagement Aspects:: Supports refined nitrogen management Supports refined nitrogen management targets, to restore estuary without targets, to restore estuary without ““excessexcess”” management action ($ savings).management action ($ savings). As Town develops restoration plan, modelAs Town develops restoration plan, model can be run for can be run for ““what ifwhat if”” scenarios (through scenarios (through SMAST Municipal Service Center).SMAST Municipal Service Center). 44Town of Nantucket Town of Nantucket Madaket Madaket -- Long Pond Estuarine System Long Pond Estuarine System N. Head Long PondNantucket SoundAtlantic OceanMadaket HarborLong PondHither CreekMadaket DitchEel PointLandfill 55Madaket Harbor / Long Pond System Madaket Harbor / Long Pond System Total Watershed N LoadTotal Watershed N Load58%24%8%10%24%10%3%4%54%5%WastewaterLandfillFertilizersImperviousSurfacesWater BodySurface Area"Natural"Surfaces58% Septic 24% Septic Overall LoadLocal Controllable LoadLF 66Tidally Averaged TN (mg/L) Tidally Averaged TN (mg/L) Total Nitrogen Gradient Present N LoadingTotal Nitrogen Gradient Present N Loading 777777Status: Status: Significantly Significantly ImpairedImpairedPrimary Restoration Primary Restoration GoalGoal: Eelgrass Habitat in : Eelgrass Habitat in region of Hither Creekregion of Hither CreekSecondary Restoration Secondary Restoration GoalGoal: Animal Habitat in : Animal Habitat in Long PondLong PondStatus: Madaket Harbor/Long Pond EstuaryStatus: Madaket Harbor/Long Pond Estuary 880.45 mg/L TN0.45 mg/L TNMEP TN Thresholds to Achieve RestorationMEP TN Thresholds to Achieve Restoration0.80 mg/L TN0.80 mg/L TNSentinel Station (M11) Threshold targets Sentinel Station (M11) Threshold targets eelgrass habitat restoration in Hither Creek eelgrass habitat restoration in Hither Creek and benthic animal habitat in Long Pondand benthic animal habitat in Long Pond 99Madaket / Long Pond System: Threshold AnalysisMadaket / Long Pond System: Threshold AnalysisMarsh/sandbarsMEP Example Threshold Scenario:MEP Example Threshold Scenario:Reduction in Existing Total Watershed LoadReduction in Existing Total Watershed Load72% 72% (100%)(100%)Total Watershed N Total Watershed N Load Reduction Load Reduction -- 47%47%0% 0% (0%)(0%)0% 0% (0%)(0%)0% 0% (0%)(0%)0% 0% (0%)(0%)66% 66% (0%)(0%) (LF 100%)(LF 100%)Watershed Reduction% Watershed Reduction% (Septic Reduction%)(Septic Reduction%) 1010Harbor Watershed: Parcel by Parcel LandHarbor Watershed: Parcel by Parcel Land--UseUse 1111Tidally Averaged Total N Tidally Averaged Total N Present N LoadingPresent N Loading 1212No EelgrassNo EelgrassNo EelgrassNo EelgrassNo EelgrassNo EelgrassEelgrass Distribution (1951, 1995, 2001)By MassDEPRecent LossAlso loss of beds from Polpis HarborEelgrass CoverageEelgrass Coverage 1313Massachusetts Estuaries Project: Massachusetts Estuaries Project: Assessment of Habitat HealthAssessment of Habitat HealthTable VIII-1. Summary of Nutrient Related Habitat Health within the Nantucket Harbor Estuarine System on Nantucket Island within the Town of Nantucket, MA., based upon assessment data presented in Chapter VII. The bilobate Polpis Harbor is an enclosed sub-system tributary to the Quaise basin. Nantucket Harbor Estuarine System Polpis Harbor Health Indicator Head of Harbor Quaise Town BasinEast West Dissolved Oxygen H2/MI1 H2/MI1 H2 H/MI3 H/MI3 Chlorophyll H6,7 H6,7 H6,7 H6,7 H6,7 Macroalgae --4 --4 --4 --4 --4 Eelgrass MI13 H H SI12 --11 Infaunal Animals H8/MI9 H8/MI9 H5 H/MI10 H/MI10 Overall: H8/MI9 H H MI14 H/MI 1414Threshold Loading APresent LoadingThreshold TN for Restoration of Eelgrass & Infauna: 0.349 mg/L at Sentinel Station 2.1 (HOH Lower), 0.356 mg/L at Sentinel Station 4 (Polpis)RestorationRestoration GoalsGoalsEelgrass Habitat 151515151515Nitrogen Management Options Nitrogen Management Options Generally via CWMP and TMDL Processes: Generally via CWMP and TMDL Processes:  Hydrodynamic optionsHydrodynamic options•• Tidal flushing/circulation enhancement & managementTidal flushing/circulation enhancement & management Natural attenuation optionsNatural attenuation options•• Nitrogen source location to maximize natural attenuationNitrogen source location to maximize natural attenuation•• Wetland/riparian zone restoration to increase attenuationWetland/riparian zone restoration to increase attenuation•• Pond restoration to create zones of natural attenuationPond restoration to create zones of natural attenuation Nitrogen source reductionsNitrogen source reductions•• Fertilizer education, Landfill ManagementFertilizer education, Landfill Management Wastewater options (what, where, how much)Wastewater options (what, where, how much)•• Centralized and decentralized systemsCentralized and decentralized systems 1616Questions & DiscussionQuestions & DiscussionSMASTPhil Detjens Tom CambareriBrian Howes Roland Samimy David Schlezinger David White Dale TonerJohn Ramsey Sean Kelley Trey Ruthven Bob Acker Liz HuntSMASTEd Eichner Sara Sampieri Jen Benson Mike Bartlett Interns TNCMassachusetts Estuaries Project Massachusetts Estuaries Project for Estuarine Restorationfor Estuarine Restoration 17178%6%9%6%71%29%20%31%20%SepticFertilizerImperviousNaturalAtmospheric8%3%19%32%38%Overall N LoadLocal N Load12%5%30%53%Polpis HarborTotal System 1818Linked WatershedLinked Watershed--Embayment ApproachEmbayment ApproachThresholds Thresholds DevelopmentDevelopment(N Target)(N Target)D.O., Eelgrass D.O., Eelgrass Infauna SurveysInfauna SurveysWatershed N Loading ModelStream Flow - N Load Total Nitrogen ModelHydrodynamic ModelTide ElevationBathymetryCurrents Watershed Delineation Model Recycled NWatercolumn NTMDL (DEP)TMDL (DEP) Clean Water ActClean Water ActN Management N Management ScenariosScenarios (MEP Tech Team)(MEP Tech Team) 19192001 2001 -- field verifiedfield verified1995 1995 -- field verifiedfield verifiedHistoric Eelgrass DistributionHistoric Eelgrass DistributionNo Record of No Record of Eelgrass Eelgrass Habitat Habitat within the Long within the Long Pond Basin or Pond Basin or Long Pond Long Pond HeadHead2003 2003 -- field verifiedfield verified2006 2006 -- photoanalysisphotoanalysis1951 1951 -- photoanalysisphotoanalysis 2020048121620242832368/5/03 8/10/03 8/15/03 8/20/03 8/25/03 8/30/03 9/4/03Dissolved Oxygen (mg/L)024681012148/5/03 8/10/03 8/15/03 8/20/03 8/25/03 8/30/03 9/4/03Dissolved Oxygen (mg/L)Dissolved Oxygen (bottom water)Stress to Infaunal AnimalsStress to Infaunal AnimalsStress to Infaunal AnimalsStress to Infaunal AnimalsHither CreekLong Pond Middle 2121 Total Total Species WeinerBasin Actual Actual Calculated DiversityEvenness StationsSpecies Individuals @75 Indiv. (H') (E)MAD & LPN3Madaket Harbor - Long Pond EstuaryMadaket Harbor--1Mean = 8 6668 2.23 0.72 MAD:3-5,7,14,15S.E. = 1 1451 0.29 0.07N = 66666Hither CreekMean = 4 1235 1.36 0.69 MAD:9,11,12S.E. = 1821 0.46 0.17N = 33333North Head Long PondMean = 5 1815 1.59 0.68 LPN: 1S.E. = ----------N = 11111 Long PondMean = 5 9476 1.19 0.60 LPN:4,5,7,8S.E. = 2 5831 0.47 0.10N = 44444Massachusetts Estuaries Project: Assessment Massachusetts Estuaries Project: Assessment of Benthic Animal Habitat Qualityof Benthic Animal Habitat Quality 2222Massachusetts Estuaries Project: Massachusetts Estuaries Project: Assessment of Habitat HealthAssessment of Habitat HealthMadaket Harbor - Long Pond Embayment System Long Pond Health Indicator Madaket Harbor Hither Creek Mid Lower North Head Long Pond Dissolved Oxygen H1 SI2 MI-SI3 MI4 H5 Chlorophyll H6 MI/SI7 SI8 MI/SI9 H/MI10 Macroalgae H11 SI12 --13 --13 --14 Eelgrass H15 SI16 --17 --17 --17 Infaunal Animals H18 SI19 MI20 MI20 H-MI21 Overall: H22SI23MI24H/MI25