Download - Predicting Effects of Point Source Controls on Escambia Bay using CMAQ and Watershed Models
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Predicting Effects of Point Source Controls on Escambia Bayusing CMAQ and Watershed ModelsbyJo Ellen Brandmeyer, Steve Beaulieu, Randy Dodd, and Michele CutrofelloRTI International, Research Triangle Park, NC, USAJustin T. Walters and John J. JansenSouthern Company, Birmingham, AL, USA Krish VijayaraghavanAtmospheric & Environmental Research, Inc., San Ramon, CA, USA
Presented at the 6th Annual CMAS ConferenceChapel Hill, NC, October 1-3, 2007
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OverviewBackground of the studyDescription of modeling domainsDescription of modelsChallenges of multimedia modeling studiesResults and conclusions
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Background of the StudyCrist Power Plant located on Escambia River, which flows into Escambia BayBay has ecological problems, including eutrophicationAdditional emission controls are planned for power plantExpects to reduce emissions by 8,600 tpy NOx and 37,000 tpy SO2What is potential reduction in nitrogen load to Escambia Bay from these additional controls?
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Multimedia Modeling RequiredNeed to calculate a change in nitrogen loading to Escambia Bay due to a change in emissions from one facilityEmissions are in airEffects of interest are in surface waterNitrogen chemistry is nonlinear in both air and surface water MM5 CMAQ ???
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Air Quality Modeling DomainSubdomain of the 1212-km Visibility Improvement State and Tribal Association of the Southeast (VISTAS) modeling domain for the southeast US centered on Alabama and Georgia (i.e., the ALGA domain) Calendar year 2002
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Watershed Modeling DomainBased on 8-digit hydrologic unitsEight HUCs in modeling domainFive completely in Escambia Bay drainage areaTwo completely in non-Escambia Bay drainage areaOne split between drainage areasEach HUC simulated independentlyWater exiting one HUC routed through downstream HUCs to Bay
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Air Quality Model ConfigurationsCMAQ-VISTASBased on CMAQ v4.5.1 with VISTAS-developed modifications to the secondary aerosol module. Does not include coarse sea-salt/HNO3 chemistryCMAQ-MADRIDBased on CMAQ v4.5.1 with EPRI-sponsored improvements including an improved aerosol module, organic chemistry, and sea-salt/HNO3 chemistryCMAQ-MADRID-APTBased on CMAQ-MADRID including advanced plume treatment (plume-in-grid).Included about 40 large power plants, including Crist, as PinG sources.
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Additional PresentationsSession 5, Tuesday 11:30 A.M. Modeling of Atmospheric Nitrogen Deposition to the Escambia Bay and Watershed in the Southeastern United StatesKrish Vijayaraghavan, Rochelle T. Balmori, Shu-Yun Chen, Prakash Karamchandani and Christian SeigneurAtmospheric & Environmental Research, Inc.Justin T. Walters and John J. JansenSouthern CompanyEladio M. KnippingElectric Power Research InstituteSession 8, Wednesday 2:30 P.M. Comparative Model Performance Evaluation of CMAQ-VISTAS, CMAQ-MADRID, and CMAQ-MADRID-APT for a Nitrogen Deposition Assessment of the Escambia Bay, Florida WatershedJay L. Haney, Sharon G. Douglas, Tom C. MyersICF InternationalJustin T. Walters, John J. JansenSouthern CompanyKrish VijayaraghavanAtmospheric & Environmental Research, Inc.
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Watershed Model ConfigurationsParameters based on land useScreening-level modelExport Coefficient Method (ECM) based on EPAs Pollutant Loading Model (PLOAD)Annual time stepIntermediate-level modelRegional Nutrient Management (ReNuMa) from Cornell UniversityModified for daily depositionRequires calibration
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Watershed Model CalibrationAdjusts model parameters to fit model output to monitoring data Fine tune model to study areaEnsure that the model reacts as expected to watershed characteristicsFit hydrology (flow) and nitrogen output2002 Flow from National Water Information System (NWIS) and local precipitation data (MM5 output was inadequate)Adjust flow-related parameters in the model (e.g., recession coefficient, seepage coefficient, land use curve numbers)Water quality data from STORET (EPA and FL-DEP)FLUX model from U.S. Army Corps of Engineers for in-stream flux from sample data and flow records
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Other Input DataLand use from National Land Cover Dataset (NLCD) grouped from 29 categories to 13 general categoriesExport coefficients by land use category from literature reviewMany more parameters including:Septic systemsPoint sources (direct discharge to surface water) from National Pollutant Discharge Elimination System (NPDES) permitsSoil characteristics by land use and watershedRate of nitrogen from fertilizer applicationErosivity coefficientsRecession coefficient (proportion of groundwater added to stream within a watershed)
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Challenges of Multimedia Modeling StudiesSpatial representationGrid cells vs. land use and watershed combinationCreated spatial factorsPrecipitation data for watershed model calibrationTemporal scaleHourly vs. daily or annualGMT vs. local timeChemical speciesChemical mechanism vs. total nitrogenCommunicating results
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Sample of Study Results
Total NitrogenCMAQ-VISTASReNuMa watershed modelwith additional controls
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Contributions of Source Types by Watershed
ReNuMa Results
HUCyearcalendar yearTotal Dry Atmos DepoTotal Wet Atmos DepoTotal Atmos DepoTotal Atmos Depo FluxPoint SourcesOther Nitrogen InputsTotal NitrogenTotal Atmos DepoTotal Nonpoint SourceTotal Point SourceSeptember Particle Nitrogen LoadDecember Particulate Load
(at start)(kg)(kg)(kg)(kg/ha)(kg)(kg)(kg)(kg)(kg)(kg)
0314010312002149591982880323247226.6082115441170440113721918937411310094204137516
031401041200295189052681914787106.69620490189376925958631615213086144
03140105_PB120023563881495725059596.43060153907502943531663124320175824
03140105_EB_RO120026194429153910976.7411041763918931070152507022959
0314030112002100806760788616159537.56350112280372126815998751865351027267
031403021200275065045238912030407.7753096618811314000720111123500024139
0314030312002121666573027219469377.17901357617414837601138311195344056245232483
0314030412002110974370252518122696.9401796561096709512020961560148862915769749336
031403051200289355255344014469917.1428670685682104133313110612091028249689164183
Direct Deposition:CQSOA_C
Escambia Bay6.2074946207
Other Bays5.2634553704
Escambia WS
Watershed Characteristics (Table X)
HUCWatershed Area (m2)Modeled Atmospheric Deposition Flux (kg/ha/yr)Modeled Atmospheric Deposition Mass (kg/yr)Average Flow 2002 (m3/s) at Outlet of HUCLong Term Mean Annaul Flow (m3/s) at Outlet of HUCDecay Coefficient (day-1)Distance to outlet (km) [from NHDPlus]Velocity Estimate Based on Jobson Method (m/s)Overall Time of Travel (d)
0314030121365089757.56161595340.6656.40.118156.80.424.4
0314030215472617597.78120304017.2824.30.118212.20.356.9
0314030327119987017.18194693736.648.00.118156.80.424.3
0314030426112998066.941812269111.3154.20.11883.30.501.9
No instream loss:
0314030520258147947.141446991141.4190.70.11800.520.0
03140105_EB_RO1351367396.7491097
Direct Deposition736184516.2145699
ReNuMa - Atmospheric Deposition
HUCTotal Export - Atmospheric Deposition (kg N/yr)Instream Loss 1Instream Loss 2Instream Loss 3Final N Mass per HUC (kg/yr)Final Flux from HUC (kg/ha/yr)Total N Mass to Bay (kg/yr)Total Flux to Bay (kg/ha/yr)Transfer Rate (%)Percent of HUC Contributions to Total Bay LoadTotal Load to Bay - Export Coeff
03140301998757843062358623580.294118950.4515.11227015
0314030272011600174713137473374730.249.1622111
031403031138318955071199711990.2617.3818867
031403041560141240431240430.4830.1874589
No instream loss:
031403051061201061200.5225.81066091
03140105_EB_RO10701107010.792.663208
ReNuMa - Non-Point Source Runoff
HUCTotal Export - NPS (kg N/yr)Instream Loss 1Instream Loss 2Instream Loss 3Final N Mass per HUC (kg/yr)Final Flux from HUC (kg/ha/yr)Total N Mass to Bay (kg/yr)Total Flux to Bay (kg/ha/yr)Transfer Rate (%)Percent of HUC Contributions to Total Bay Load
0314030118653511464830116465611646565.4541644233.75128.0
0314030211235009363767353215846395846393.7814.0
0314030311953449403697476687476682.7618.0
031403048862917046727046722.7016.9
No instream loss:
031403059102829102824.4921.9
03140105_EB_RO52507525073.891.3
ReNuMa - Point SourceSee "PCS_Processed_Data.xls"
HUCTotal Export - Point Discharge (kg N/yr)Instream Loss 1Instream Loss 2Instream Loss 3Final N Mass per HUC (kg/yr)Final Flux from HUC (kg/ha/yr)Total N Mass to Bay (kg/yr)
0314030100000.0095563
03140302000000.00
0314030300000.00
031403045769745874458740.18
No instream loss:
0314030549689496890.25
03140105_EB_RO000.00
Direct Discharge EB24339243393.31
do not change DD EBRO Point Source
Non-Escambia WS
Watershed Characteristics (Table X)
HUCWatershed Area (m2)Modeled Atmospheric Deposition Flux (kg/ha/yr)Modeled Atmospheric Deposition Mass (kg/yr)Average Flow 2002 (m3/s) at Outlet of HUCLong Term Mean Annaul Flow (m3/s) at Outlet of HUCDecay Coefficient (day-1)Distance to outlet (km) [from NHDPlus]Velocity Estimate Based on Jobson Method (m/s)Overall Time of Travel (d)
0314010335179175306.6232472281.375.89.30.540.2
0314010422082835526.7147871049.748.22.20.490.1
03140105_PB7867949126.4505959
Direct Deposition3860403935.3203191
ReNuMa - Atmospheric
HUCTotal Export - Atmospheric Deposition (kg N/yr)Final N Mass per HUC (kg/yr)Final Flux from HUC (kg/ha/yr)Total N Mass to Bay (kg/yr)Total Flux to Bay (kg/ha/yr)Transfer Rate (%)Percent of HUC Contributions to Total Bay LoadTotal Load to Bay - Export Coeff
0314010389374893740.252011710.3544.41224587
0314010458631586310.2729.1673844
03140105_PB53166531660.6826.4365598
ReNuMa - NPS
HUCTotal Export - NPS (kg N/yr)Final N Mass per HUC (kg/yr)Final Flux from HUC (kg/ha/yr)Total N Mass to Bay (kg/yr)Total Flux to Bay (kg/ha/yr)Transfer Rate (%)Percent of HUC Contributions to Total Bay Load
03140103113100911310093.2120586543.24854.9
031401046152136152132.7929.9
03140105_PB3124323124323.9715.2
ReNuMa - Point SourcesSee "PCS_Processed_Data.xls"
HUCTotal Export - Point Discharge (kg N/yr)Final N Mass per HUC (kg/yr)Final Flux from HUC (kg/ha/yr)Total N Mass to Bay (kg/yr)
03140103420442040.014204
03140104000.00
03140105_PB000.00
Direct - Other2414142414146.25
Do Not Change PB Direct Point Source
Entire WS
HUCWatershed Area (m2)Modeled Atmospheric Deposition Flux (kg/ha/yr)Modeled Atmospheric Deposition Mass (kg/yr)
0314030121365089757.561615953
0314030215472617597.781203040
0314030327119987017.181946937
0314030426112998066.941812269
No instream loss:
0314030520258147947.141446991
03140105_EB_RO1351367396.7491097
0314010335179175306.612324722
0314010422082835526.701478710
03140105_PB7867949126.43505959
Direct Deposition4596588445.41248889
Export Coefficient Method
HUCFinal N Mass per HUC - AD (kg/yr)Final N Mass per HUC - NPS (kg/yr)Final N Mass per HUC - Point Discharge (kg/yr)Final N Mass per HUC (kg/yr)Final Flux from HUC (kg/ha/yr)Total N Mass to Bay (kg/yr)Total Flux to Bay (kg/ha/yr)Transfer Rate (%)Percent of HUC Contributions to Total Bay Load
03140301623581164656012270155.7470059474.05617.5
031403023747358463906221114.028.9
031403037119974766808188673.0211.7
03140304124043704672458748745893.3512.5
031403051061209102824968910660915.2615.2
03140105_EB_RO10701525070632084.680.9
Direct Discharges EB456992433970038
4.18avg. land flux
03140103893741131009420412245873.4817.5
031401045863161521306738443.059.6
03140105_PB5316631243203655984.655.2
Direct Discharges Other203190.637972302241414444605
3.48avg. land flux
Totals861955622307736552074505523.96
EB Only45759341644231199024741918
PB Only404361.63797230220586542456182708633.6379723
Entire WS (tons)
HUCWatershed Area (acres)Modeled Atmospheric Deposition Flux (tons/acre/yr)Modeled Atmospheric Deposition Mass (tons/yr)
031403015279310.00341781
031403023823280.00351326
031403036701350.00322146
031403046452520.00311997
No instream loss:
031403055005790.00321595
03140105_EB_RO333920.0030100
031401038692770.00292562
031401045456670.00301630
03140105_PB1944170.0029558
Direct Deposition1135820.0024274
Export Coefficient Method
HUCFinal N Mass per HUC - AD (tons/yr)Final N Mass per HUC - Other (tons/yr)Final N Mass per HUC - Point Loads (tons/yr)Final N Mass per HUC (tons/yr)Final Flux from HUC (tons/acre/yr)Total N Mass to Bay (tons/yr)Total Flux to Bay (tons/acre/yr)Transfer Rate (%)Percent of HUC Contributions to Total Bay Load
03140301691283013520.002677210.00185617.5
031403024164406860.00188.9
031403037882409020.001311.7
03140304137777519640.001512.5
0314030511710035511750.002315.2
03140105_EB_RO12580700.00210.9
Direct Discharges EB50027770.0000
0.0019
03140103981246513490.001617.5
031401046567807430.00149.6
03140105_PB5934404030.00215.2
Direct Discharges Other224266490
0.0016
Totals9506858403821117.67
No Direct Depo67668581107643
No Direct Depo - EB45445891055148
No Direct Depo - PB222226952495
Atmospheric Results
Atmospheric Deposition Flux (kg/ha/yr)1Atmospheric Deposition Rate (kg/yr)Mass Transport from the Watershed (kg/yr)2Instream Mass Losses (kg/yr)Mass Load to the Bay (kg/yr)3Percent Reaching the Bay (transfer rate)Mass Retained by the WatershedMass Load to the Bay - no Direct DepositionIndirect Atmospheric DepositionPercent Exported From the Watershedcheck
Escambia Bay Watershedscheck
HUC 031403017.561,615,95399,87537,51762,3583.86623581,516,0781,615,9536.214.3
HUC 031403027.781,203,04072,01134,53837,4733.11374731,131,0291,203,0406.013.7
HUC 031403037.181,946,937113,83142,63271,1993.66711991,833,1061,946,9375.813.1
HUC 031403046.941,812,269156,01431,971124,0436.841240431,656,2551,812,2698.613.7
HUC 031403057.141,446,991106,1200106,1207.331061201,340,8711,446,9917.317.4
HUC 03140105_EB_RO6.7491,09710,701010,70111.751070180,39691,09711.727.1
Escambia Bay Waterbody6.2145,699NANA45,699100.00
Totals for Escambia BayNA8,161,986558,552146,657457,5935.614575937,603,434411,8958,116,287
Non-Escambia Bay Watersheds
HUC 031401036.62,324,72289,374089,3743.842,235,3482,324,7223.814.9
HUC 031401046.71,478,71058,631058,6313.971,420,0791,478,7104.014.6
HUC 03140105_PB6.4505,95953,166053,16610.51452,793505,95910.523.5
Other Bay Waterbodies45.3203,191NANA203,191100.00
Totals for Non-Escambia BayNA4,512,582201,1710404,3628.964,311,411201,1714,309,391
Totals for All of Pensacola BayNA12,674,567759,723146,657861,9556.8011,914,844613,06612,425,678
1. Based on modeled deposition flux predicted by CMAQ 4.5.1 with SOA modifications
2. Calculated by ReNuMa
3. Calculated after accounting for first order losses instream (from USGS SPARROW model) using time-of-travel stream characteristics from 2002
flow data and NHDPlus
4. Other Bay Waterbodies include East Bay, Blackwater Bay, Pensacola Bay, and Santa Rosa Sound
Totals for the bays include direct deposition loads to the water surface as well as indirect loads from the watersheds.
Conversions0.001102 tons/kg
2.471 acres/ha
Atmospheric Deposition Flux (tons/acre/yr)1Atmospheric Deposition Rate (tons/yr)Mass Transport from the Watershed (tons/yr)2Instream Mass Losses (tons/yr)Mass Load to the Bay (tons/yr)3Percent Reaching the Bay (transfer rate)Mass Retained by the WatershedMass Load to the Bay - no Direct DepositionIndirect Atmospheric DepositonPercent Exported From the Watershed
Escambia Bay Watersheds
HUC 031403010.00341,78111041693.871,6711,7816.2
HUC 031403020.00351,3267938413.091,2471,3266.0
HUC 031403030.00322,14612547783.632,0212,1465.8
HUC 031403040.00311,997172351376.861,8251,9978.6
HUC 031403050.00321,59511701177.341,4781,5957.3
HUC 03140105_EB_RO0.00301001201212.008810011.7
Escambia Bay Waterbody0.002850NANA50100
Totals for Escambia BayNA8,9956151615045.604548,3304548,944
Non-Escambia Bay Watersheds
HUC 031401030.00292,562980983.832,4642,5623.8
HUC 031401040.00301,630650653.991,5651,6304.0
HUC 03140105_PB0.00295585905910.5749955810.5
Other Bay Waterbodies40.0023224NANA224100
Totals for Non-Escambia BayNA4,97422204468.972224,5282224,749
Totals for All of Pensacola BayNA13,9698371619506.8012,85867613,693
1. Based on modeled deposition flux predicted by CMAQ 4.5.1 with SOA modifications
2. Calculated by ReNuMa
3. Calculated after accounting for first order losses instream (from USGS SPARROW model) using time-of-travel stream characteristics from 2002
flow data and NHDPlus
4. Other Bay Waterbodies include East Bay, Blackwater Bay, Pensacola Bay, and Santa Rosa Sound
Totals for the bays include direct deposition loads to the water surface as well as indirect loads from the watersheds.
"Other" Results
Non-Point SourcesPoint Discharges
Mass Transport from the Watershed (kg/yr)1Instream Mass Losses (kg/yr)Mass Load to the Bay (kg/yr)2Point Discharge Rate (kg/yr)3Point Discharge After Denitrification Losses (kg/yr)Instream Mass Losses (kg/yr)Mass Load to the Bay (kg/yr)2
Escambia Bay Watersheds
HUC 031403011,865,351700,6951,164,6560000
HUC 031403021,123,500538,861584,6390000
HUC 031403031,195,344447,676747,6680000
HUC 03140304886,291181,619704,67279,65657,69711,82345,874
HUC 03140305910,2820910,28267,06849,689049,689
HUC 03140105_EB_RO52,507052,5070000
Escambia Bay Waterbody4NANANA24,33924,339024,339
Totals for Escambia Bay6,033,2751,868,8524,164,423171,063131,72511,823119,902
Non-Escambia Bay Watersheds
HUC 031401031,131,00901,131,00911,5444,20404,204
HUC 03140104615,2130615,2130000
HUC 03140105_PB312,4320312,4320000
Other Bay Waterbodies5NANANA241,414241,4140241,414
Totals for Non-Escambia Bay2,058,65402,058,654252,958245,6180245,618
Totals for All of Pensacola Bay8,091,9291,868,8526,223,077424,021377,34311,823365,520
1. Calculated by ReNuMa
2. Calculated after accounting for first order losses instream using time-of-travel stream characteristics from 2002 flow data and
the NHDPlus; Does not include direct deposition to the bay
3. Calculated using data mined from EPA's Permit Compliance System; Nitrogen and flow measurements recorded for 2002 were used.
4. Point discharges that flow directly into Escambia Bay are included as direct sources. Non-point sources from the lands
surrounding the bay are included in HUC 03140105_EB_RO totals.
5. Other Bay Waterbodies include East Bay, Blackwater Bay, Pensacola Bay, and Santa Rosa Sound. Point discharges that flow directly into these
bay waters are included as direct sources.
Non-Point SourcesPoint Discharges
Mass Transport from the Watershed (tons/yr)1Instream Mass Losses (tons/yr)Mass Load to the Bay (tons/yr)2Discharge Rate (tons/yr)3Point Discharge After Denitrification Losses (tons/yr)Instream Mass Losses (tons/yr)Mass Load to the Bay (tons/yr)2
Escambia Bay Watersheds
HUC 031403012,0567721,2830000
HUC 031403021,2385946440000
HUC 031403031,3174938240000
HUC 0314030497720077788641351Total Load Checks
HUC 031403051,00301,0037455055
HUC 03140105_EB_RO580580000NPS & PD:w/ Atmos
Escambia Bay Waterbody4NANANA2727027allno directallno direct
Totals for Escambia Bay6,6492,0594,589189146131334,7224,6955,2265,149
Non-Escambia Bay Watershedscheck5,226
HUC 031401031,24601,24613505
HUC 0314010467806780000
HUC 03140105_PB34403440000NPS & PD:w/ Atmos
Other Bay Waterbodies5NANANA2662660266allno directallno direct
Totals for Non-Escambia Bay2,26802,26827927102712,5392,2732,9852,495
Totals for All of Pensacola Bay8,9172,0596,85746841713404
1. Calculated by ReNuMasum8,2117,644
2. Calculated after accounting for first order losses instream using time-of-travel stream characteristics from 2002 flow data andcheck8,211
the NHDPlus; Does not include direct deposition to the bay
3. Calculated using data mined from EPA's Permit Compliance System; Nitrogen and flow measurements recorded for 2002 were used.
4. Point discharges that flow directly into Escambia Bay are included as direct sources. Non-point sources from the lands
surrounding the bay are included in HUC 03140105_EB_RO totals.
5. Other Bay Waterbodies include East Bay, Blackwater Bay, Pensacola Bay, and Santa Rosa Sound. Point discharges that flow directly into these
bay waters are included as direct sources.
Combined Results
Percent Atmospheric DepositionPercent Non-Point SourcesPercent Point DischargesTotal Load From All Sources Reaching the Bay (kg/yr)Check
Escambia Bay Watersheds
HUC 031403015.194.901,227,015100.0
HUC 031403026.094.00622,111100.0
HUC 031403038.791.30818,867100.0
HUC 0314030414.280.65.2874,589100.0
HUC 0314030510.085.44.71,066,091100.0
HUC 03140105_EB_RO16.983.10.063,208100.0
Escambia Bay Waterbody65.2NA34.870,038100.0
Totals for Escambia Bay9.687.82.54,741,918100.0
Non-Escambia Bay Watersheds
HUC 031401037.392.40.31,224,587100.0
HUC 031401048.791.30673,844100.0
HUC 03140105_PB14.585.50365,598100.0
Other Bay Waterbodies45.7NA54.3444,605100.0
Totals for Non-Escambia Bay14.976.09.12,708,634100.0
Totals for All of Pensacola Bay11.683.54.97,450,552100.0
Percent Atmospheric DepositionPercent Non-Point SourcesPercent Point DischargesTotal Load From All Sources Reaching the Bay (tons/yr)
Escambia Bay Watersheds
HUC 031403015.194.90.01,352
HUC 031403026.094.00.0686
HUC 031403038.791.30.0902
HUC 0314030414.280.65.2964
HUC 0314030510.085.44.71,175
HUC 03140105_EB_RO16.983.10.070
Escambia Bay Waterbody65.2NA34.877
Totals for Escambia Bay9.687.82.55,226
Non-Escambia Bay Watersheds
HUC 031401037.392.40.31,349
HUC 031401048.791.30.0743
HUC 03140105_PB14.585.50.0403
Other Bay Waterbodies45.7NA54.3490
Totals for Non-Escambia Bay14.976.09.12,985
Totals for All of Pensacola Bay11.683.54.98,211
Majority NPS
September Non-Point Source Transport from Watershed (kg/month)Percent of Total Non-Point Load Transport
Escambia Bay WatershedsThis worksheet tracks the loads from September 2002.
HUC 0314030127,2671During this month there was record precipitation according
HUC 0314030224,1392to the NCDC gages used as weather inputs to the ReNuMa
HUC 0314030356,2455model.
HUC 0314030449,3366
HUC 03140305164,18318Because of this record rainfall and the way ReNuMa uses
HUC 03140105_EB_RO22,95944weather input, there are very high non-point source runoff in
Non-Escambia Bay Watershedsthe form of particulate nitrogen during this month. Often, the
HUC 03140103137,51612runoff in this month plays a significant role in the non-point
HUC 0314010486,14414source totals for nitrogen for the year for the watershed.
HUC 03140105_PB175,82456
This table was made for this reason. It highlights the fact
that the much higher non-point source loads are due to storm
September Non-Point Source Transport from Watershed (tons/month)Percent of Total Non-Point Load Transportrunoff from a specific storm (Hurricane Isidore).
Escambia Bay Watersheds
HUC 03140301301
HUC 03140302272
HUC 03140303625
HUC 03140304546
HUC 0314030518118
HUC 03140105_EB_RO2544
Non-Escambia Bay Watersheds
HUC 0314010315212
HUC 031401049514
HUC 03140105_PB19456
Mass Tracking
8944.1482748330615161504
4748.94888245282220446
13693.09715612858837161950
Indirect Atmospheric Deposition
Retained by Watershed
Transport from Watershed
Instream Losses
Net Load to Bay (Direct + Indirect)
Mass Rate (tons/yr)
Contributions_EB
68.71880703141283.45126823280
41.2947656504644.2719752290
78.4617286823.92983028880
136.6959314842776.548090626950.5528039717
116.944241003.13076454.757278
11.79250257.8627140
50.35987247026.821578
Atmospheric Deposition
Non-Point Sources
Point Discharges
Mass Loading Rate (tons/yr)
Contributions_Other
98.4901481246.3719184.632808
64.611362677.9647260
58.588932344.3000640
223.9160830455Direct Discharges Other266.038228
Atmospheric Deposition
Non-Point Sources
Point Discharges
Mass Loading Rate (tons/yr)
LandUsePercents
LULand Use DescriptionPercentage of Land Area Per Land Use by HUC
031401030314010403140105_PB03140105_EB_RO0314030103140302031403030314030403140305PassThrough
11Open Water1.00.71.32.31.20.60.40.60.80.9
21Developed, Open Space6.16.215.522.64.23.93.73.05.50.2
22Developed, Low Intensity0.90.711.411.10.60.30.40.51.40.3
23Developed, Medium Intensity0.20.24.42.50.20.10.10.10.30.4
24Developed, High Intensity0.10.12.00.90.10.00.00.00.10.5
30Barren0.30.25.43.70.00.00.10.40.50.8
40Forest51.356.725.019.560.258.463.562.735.90.1
52Scrub/Shrub11.58.47.22.511.312.211.111.510.50.15
71Grassland/Herbaceous3.44.66.04.50.10.10.11.03.80.15
81Pasture/Hay10.72.90.73.59.910.810.17.46.20.2
82Crop4.99.60.40.64.94.82.84.717.50.3
90Woody Wetlands9.39.517.615.97.38.87.57.716.50.1
95Emergent Herbaceous Wetland0.40.33.110.40.20.20.20.31.10.7
Forest + Woody Wetland + Grassland + Scrub/Shrub75.579.155.842.478.879.482.282.966.7
Approximate Pass Through Rate14.914.623.527.114.313.713.113.717.4
nhd Parameters
HUCCOMIDGRID_CODESTREAMLEVESTREAMORDEFROMNODETONODEHYDROSEQLEVELPATHIPATHLENGTHTERMINALPACUMDRAINAGMAFLOWUMAFLOWVMAVELUMAVELVINCRFLOWUMAXELEVRAWMINELEVRAWMAXELEVSMOMINELEVSMOSLOPE
0314010389799916020431681262016708126201783812620006981262000049.31481262000043485.42676.32265.81.71.74.9-9998.00.20.20.20.00000
0314010479399615999331681268009738126800975812680000981268000012.18781268000012234.81700.31588.71.61.66.8-9998.00.01.20.00.00038
0314030123787611638871158475501252847470070484755000018290200031156.78482902000313683.71992.52006.01.61.61.9-9998.025.926.625.90.00023
0314030223788751638928248475501320847550132684755002428475500240212.23882902000311554.4858.2855.71.41.40.8-9998.051.251.851.80.00000
0314030324027071640323258475101375847470070484751000018475100001156.78482902000312713.91693.71594.51.51.52.2-9998.025.826.525.90.00023
031403042418508164224616847470181284747018168474700010829020003183.32182902000319008.65446.65241.42.02.00.1-9998.011.016.716.70.00000
03140305448560159808916829020089282902008228290200094829020003119.221829020003110761.36732.76377.82.12.11.2-9998.03.35.55.50.00000
m3/s flow
0314010375.7914322848
0314010448.1521507792
0314030156.4284201472
0314030224.3030807216
0314030347.9666570448
03140304154.2463036464
03140305190.6690051152
HUCCOMIDDistance to outlet (km) [from NHDPlus]Velocity Estimate Based on Jobson Method (m/s)Overall Time of Travel (d)
031403012378761156.80.41534.4
031403022378875212.20.35476.9
031403032402707156.80.63072.9
03140304241850883.30.49611.9
0314030544856019.20.51850.4
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Overall Loadings to Escambia Bay
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Nitrogen Deposited, Retained, and Transferred Within the System
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Sample of Study Results
CMAQ-VISTASReNuMa watershed modelDifference due to additional controls
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Results of Implementing ControlsReNuMa predicts a smaller decrease in load due to controls compared to the ECM Reductions for the Escambia Bay WS and Non-Escambia Bay WS similar between the models Higher transfer rate for Non-Escambia Bay system (~18%) compared to Escambia Bay system (~13%)* Change in Mass to Bay is due only to change in Atmospheric Deposition load to the bay for the ECM but due to both Atmospheric Deposition and Non-Point Source load changes for ReNuMa
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Transfer Rates Due to Controls
As you add text, the rectangle's height increases. Vary the width by stretching a side.
Transfer Rates for Change in Atmospheric LoadEscambia Bay12%Non-Escambia Bay17%Pensacola Bay14%
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Conclusions and RecommendationsThis study demonstrated how cross-media modeling can simulate impacts from air emission changes on water quality. By using the one-atmosphere approach of CMAQ combined with watershed models and routing between watersheds, fate and transport across media can be examined.The methods developed here are transferable to other locations, but the results are not directly applicable. The study was constrained by using a single year of meteorology. Abnormal precipitation (e.g., tropical systems) can have significant effects on watershed modeling results. All efforts such as this project will benefit greatly from additional, site-specific data, both atmospheric and watershed.
we had a different set of species for MADRID (and MADRID-APT) than for the VISTAS configurations of CMAQ Reductions for the Escambia Bay WS and Non-Escambia Bay WS similar between the models ~15-16 tpy with ECM; ~11.5 tpy with ReNuMaSimilar decrease in both systems, yet input to Escambia Bay almost double the input to Non-Escambia Bay system