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T.F. Green Airport Improvement Program Environmental Impact Statement and Final Section 4(f) Evaluation
Appendix K
Water Quality
T.F. Green Airport Warwick, Rhode Island
Prepared for Federal Aviation Administration
Prepared by
July 2011
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T.F. Green Airport Improvement Program Environmental Impact Statement and Final Section 4(f) Evaluation
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T.F. Green Airport Improvement Program Environmental Impact Statement and Final Section 4(f) Evaluation
T.F. Green Airport Improvement Program FEIS Appendix
Appendix K, Water Quality, of this Final Environmental Impact Statement (FEIS) provides updated and new technical information since the publication of the Draft Environmental Impact Statement (DEIS) in July 2010. The DEIS, provided on the enclosed DVD, contained a corresponding technical report, Water Quality Technical Report, describing significant technical information pertaining to the water quality analysis. It is intended that this FEIS appendix provide an update to the DEIS technical report. Reviewers should consult both the DEIS and FEIS for full documentation.
Table of Contents
K.1 HydroCAD Calculations ......................................................................... K-1
K.2 Pond Sizing Analysis .......................................................................... K-15
K.3 Water Quality Monitoring Data ............................................................. K-21
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T.F. Green Airport Improvement Program Environmental Impact Statement and Final Section 4(f) Evaluation
K.1 HydroCAD Calculations
The following sections provide the results of the HydroCAD Calculations for the 2004 Baseline Condition and the proposed T.F. Green Airport Improvement Program Preferred Alternative (Alternative B4).
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EX1BBN DP1
BuckeyeBrookNorth ToBuckeyeBrookNorth
EX2WP DP2
WarwickPond ToWarwickPond
EX3BBS DP3
BuckeyeBrookSouth ToBuckeyeBrookSouth
EX4TB DP4
TuscatucketBrook ToTuscatucketBrook
EX5CB DP5
CallahanBrook ToCallahanBrook
DrainageDiagramfor0922806ExistingConditionsSubcat Reach Pond Link PreparedbyVanasseHangenBrustlin,Inc., Printed2/2/2011
HydroCAD9.00 s/n01237 2009HydroCADSoftwareSolutionsLLC
K-3
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0922806ExistingConditions TypeIII24hr100Year Rainfall=8.70" PreparedbyVanasseHangenBrustlin,Inc. Printed 2/2/2011 HydroCAD9.00 s/n01237 2009HydroCADSoftwareSolutionsLLC Page2
Timespan=5.0020.00hrs,dt=0.05hrs,301points RunoffbySCSTR20method,UH=SCS
ReachroutingbyStorInd+Transmethod PondroutingbyStorIndmethod
SubcatchmentEX1BBN:BuckeyeBrookRunoffArea=598.000ac 39.98%Impervious RunoffDepth>4.21"FlowLength=8,175' Tc=47.8min CN=66 Runoff=1,436.88cfs 209.596af
SubcatchmentEX2WP:WarwickPond RunoffArea=23.900ac 48.95%Impervious RunoffDepth>4.48"FlowLength=1,213' Tc=23.8min CN=68 Runoff=84.51cfs 8.916af
SubcatchmentEX3BBS:BuckeyeBrookRunoffArea=458.500ac 33.13%Impervious RunoffDepth>3.75"FlowLength=4,962' Tc=44.1min CN=62 Runoff=1,025.46cfs 143.269af
SubcatchmentEX4TB:Tuscatucket RunoffArea=145.600ac 24.04%Impervious RunoffDepth>2.73"FlowLength=2,031' Tc=44.7min CN=53 Runoff=230.28cfs 33.143af
SubcatchmentEX5CB:CallahanBrook RunoffArea=132.900ac 19.49%Impervious RunoffDepth>2.87"FlowLength=1,566' Tc=26.6min CN=54 Runoff=281.90cfs 31.738af
LinkDP1:ToBuckeyeBrookNorth Inflow=1,436.88cfs 209.596af Primary=1,436.88cfs 209.596af
LinkDP2:ToWarwickPond Inflow=84.51cfs 8.916af Primary=84.51cfs 8.916af
LinkDP3:ToBuckeyeBrookSouth Inflow=1,025.46cfs 143.269af Primary=1,025.46cfs 143.269af
LinkDP4:ToTuscatucketBrook Inflow=230.28cfs 33.143af Primary=230.28cfs 33.143af
LinkDP5:ToCallahanBrook Inflow=281.90cfs 31.738af Primary=281.90cfs 31.738af
TotalRunoffArea=1,358.900ac RunoffVolume=426.662af AverageRunoffDepth=3.77" 65.88%Pervious=895.300ac 34.12%Impervious=463.600ac
K-4
http:Primary=281.90http:Inflow=281.90http:Primary=230.28http:Inflow=230.28http:Primary=1,025.46http:Inflow=1,025.46http:Primary=84.51http:Inflow=84.51http:Primary=1,436.88http:Inflow=1,436.88http:Runoff=281.90http:Depth>2.87http:Runoff=230.28http:Depth>2.73http:Runoff=1,025.46http:Depth>3.75http:Runoff=84.51http:Depth>4.48http:Runoff=1,436.88http:Depth>4.21http:span=5.0020.00http:Rainfall=8.70
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0922806ExistingConditions TypeIII24hr100Year Rainfall=8.70" PreparedbyVanasseHangenBrustlin,Inc. Printed 2/2/2011 HydroCAD9.00 s/n01237 2009HydroCADSoftwareSolutionsLLC Page3
SummaryforSubcatchmentEX1BBN:BuckeyeBrookNorth
Runoff = 1,436.88cfs@ 12.67hrs,Volume= 209.596af,Depth> 4.21"
RunoffbySCSTR20method,UH=SCS,TimeSpan=5.0020.00hrs,dt=0.05hrs TypeIII24hr100Year Rainfall=8.70"
Area(ac) CN Description 239.100 98 Pavedparking,HSGA 180.600 43 Woods/grasscomb.,Fair,HSGA
8.500 76 Woods/grasscomb.,Fair,HSGC 11.500 82 Woods/grasscomb.,Fair,HSGD
158.300 43 Woods/grasscomb.,Fair,HSGA 598.000 66 WeightedAverage 358.900 60.02%PerviousArea 239.100 39.98%ImperviousArea
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs)
9.6 50 0.0050 0.09 SheetFlow,
Grass:Short n=0.150 P2=3.30"
1.5 194 0.0110 2.13 ShallowConcentratedFlow,
Paved Kv=20.3fps
36.7 7,931 0.0025 3.60 11.31 PipeChannel,
24.0" Round Area=3.1sf Perim=6.3' r=0.50' n=0.013 Concretepipe,bends&connections
47.8 8,175 Total
SummaryforSubcatchmentEX2WP:WarwickPond
Runoff = 84.51cfs@ 12.33hrs,Volume= 8.916af,Depth> 4.48"
RunoffbySCSTR20method,UH=SCS,TimeSpan=5.0020.00hrs,dt=0.05hrs TypeIII24hr100Year Rainfall=8.70"
Area(ac) CN Description 11.700 98 Pavedparking,HSGA
0.400 39 >75%Grasscover,Good,HSGA * 11.800 39 >75%Grasscover,Good,HSGA(assumed)
23.900 68 WeightedAverage 12.200 51.05%PerviousArea 11.700 48.95%ImperviousArea
K-5
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0922806ExistingConditions TypeIII24hr100Year Rainfall=8.70" PreparedbyVanasseHangenBrustlin,Inc. Printed 2/2/2011 HydroCAD9.00 s/n01237 2009HydroCADSoftwareSolutionsLLC Page4
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.6 100 0.0030 0.08 SheetFlow,
Grass:Short n=0.150 P2=3.30" 0.3 50 0.0340 2.97 ShallowConcentratedFlow,
Unpaved Kv=16.1fps 2.9 1,063 0.0070 6.02 18.93 PipeChannel,
24.0" Round Area=3.1sf Perim=6.3' r=0.50' n=0.013 Concretepipe,bends&connections
23.8 1,213 Total
SummaryforSubcatchmentEX3BBS:BuckeyeBrookSouth
Runoff = 1,025.46cfs@ 12.62hrs,Volume= 143.269af,Depth> 3.75"
RunoffbySCSTR20method,UH=SCS,TimeSpan=5.0020.00hrs,dt=0.05hrs TypeIII24hr100Year Rainfall=8.70"
Area(ac) CN Description 151.900 98 Pavedparking,HSGA
47.000 39 >75%Grasscover,Good,HSGA 9.200 61 >75%Grasscover,Good,HSGB
35.800 74 >75%Grasscover,Good,HSGC 5.400 80 >75%Grasscover,Good,HSGD
209.200 39 >75%Grasscover,Good,HSGA 458.500 62 WeightedAverage 306.600 66.87%PerviousArea 151.900 33.13%ImperviousArea
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.1 100 0.0140 0.15 SheetFlow,
Grass:Short n=0.150 P2=3.30" 15.7 1,126 0.0055 1.19 ShallowConcentratedFlow,
Unpaved Kv=16.1fps 17.3 3,736 0.0025 3.60 11.31 PipeChannel,
24.0" Round Area=3.1sf Perim=6.3' r=0.50' n=0.013 Concretepipe,bends&connections
44.1 4,962 Total
SummaryforSubcatchmentEX4TB:TuscatucketBrook
Runoff = 230.28cfs@ 12.66hrs,Volume= 33.143af,Depth> 2.73"
RunoffbySCSTR20method,UH=SCS,TimeSpan=5.0020.00hrs,dt=0.05hrs TypeIII24hr100Year Rainfall=8.70"
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0922806ExistingConditions TypeIII24hr100Year Rainfall=8.70" PreparedbyVanasseHangenBrustlin,Inc. Printed 2/2/2011 HydroCAD9.00 s/n01237 2009HydroCADSoftwareSolutionsLLC Page5
Area(ac) CN Description 35.000 98 Pavedparking,HSGA 29.300 39 >75%Grasscover,Good,HSGA 81.300 39 >75%Grasscover,Good,HSGA
145.600 53 WeightedAverage 110.600 75.96%PerviousArea
35.000 24.04%ImperviousArea
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.6 100 0.0030 0.08 SheetFlow,
Grass:Short n=0.150 P2=3.30" 22.9 1,498 0.0046 1.09 ShallowConcentratedFlow,
Unpaved Kv=16.1fps 1.2 433 0.0067 5.89 18.52 PipeChannel,
24.0" Round Area=3.1sf Perim=6.3' r=0.50' n=0.013 Concretepipe,bends&connections
44.7 2,031 Total
SummaryforSubcatchmentEX5CB:CallahanBrook
Runoff = 281.90cfs@ 12.40hrs,Volume= 31.738af,Depth> 2.87"
RunoffbySCSTR20method,UH=SCS,TimeSpan=5.0020.00hrs,dt=0.05hrs TypeIII24hr100Year Rainfall=8.70"
Area(ac) CN Description 25.900 98 Pavedparking,HSGA 91.100 43 Woods/grasscomb.,Fair,HSGA
0.800 65 Woods/grasscomb.,Fair,HSGB 15.100 43 Woods/grasscomb.,Fair,HSGA
132.900 54 WeightedAverage 107.000 80.51%PerviousArea
25.900 19.49%ImperviousArea
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.6 100 0.0060 0.11 SheetFlow,
Grass:Short n=0.150 P2=3.30" 7.8 585 0.0038 1.25 ShallowConcentratedFlow,
Paved Kv=20.3fps 3.2 881 0.0040 4.55 14.31 PipeChannel,
24.0" Round Area=3.1sf Perim=6.3' r=0.50' n=0.013 Concretepipe,bends&connections
26.6 1,566 Total
K-7
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0922806ExistingConditions TypeIII24hr100Year Rainfall=8.70" PreparedbyVanasseHangenBrustlin,Inc. Printed 2/2/2011 HydroCAD9.00 s/n01237 2009HydroCADSoftwareSolutionsLLC Page6
SummaryforLinkDP1:ToBuckeyeBrookNorth
InflowArea= 598.000ac, 39.98%Impervious,InflowDepth> 4.21" for 100Yearevent Inflow = 1,436.88cfs@ 12.67hrs,Volume= 209.596af Primary = 1,436.88cfs@ 12.67hrs,Volume= 209.596af,Atten=0%,Lag=0.0min
Primaryoutflow=Inflow,TimeSpan=5.0020.00hrs,dt=0.05hrs
SummaryforLinkDP2:ToWarwickPond
InflowArea= 23.900ac, 48.95%Impervious,InflowDepth> 4.48" for 100Yearevent Inflow = 84.51cfs@ 12.33hrs,Volume= 8.916af Primary = 84.51cfs@ 12.33hrs,Volume= 8.916af,Atten=0%,Lag=0.0min
Primaryoutflow=Inflow,TimeSpan=5.0020.00hrs,dt=0.05hrs
SummaryforLinkDP3:ToBuckeyeBrookSouth
InflowArea= 458.500ac, 33.13%Impervious,InflowDepth> 3.75" for 100Yearevent Inflow = 1,025.46cfs@ 12.62hrs,Volume= 143.269af Primary = 1,025.46cfs@ 12.62hrs,Volume= 143.269af,Atten=0%,Lag=0.0min
Primaryoutflow=Inflow,TimeSpan=5.0020.00hrs,dt=0.05hrs
SummaryforLinkDP4:ToTuscatucketBrook
InflowArea= 145.600ac, 24.04%Impervious,InflowDepth> 2.73" for 100Yearevent Inflow = 230.28cfs@ 12.66hrs,Volume= 33.143af Primary = 230.28cfs@ 12.66hrs,Volume= 33.143af,Atten=0%,Lag=0.0min
Primaryoutflow=Inflow,TimeSpan=5.0020.00hrs,dt=0.05hrs
SummaryforLinkDP5:ToCallahanBrook
InflowArea= 132.900ac, 19.49%Impervious,InflowDepth> 2.87" for 100Yearevent Inflow = 281.90cfs@ 12.40hrs,Volume= 31.738af Primary = 281.90cfs@ 12.40hrs,Volume= 31.738af,Atten=0%,Lag=0.0min
Primaryoutflow=Inflow,TimeSpan=5.0020.00hrs,dt=0.05hrs
K-8
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1BBN
BuckeyeBrookNorth
3BBS
BuckeyeBrookSouth
4TB
TuscatucketBrook
5CB
CallahanBrook
DP1
ToBuckeyeBrookNorth
2WP
WarwickPond
DP2
ToWarwickPond
DP3
ToBuckeyeBrook
South
DP4
ToTuscatucketBrook
DP5
ToCallahanBrook
DrainageDiagramfor0922806ProposedConditionsALTB4Subcat Reach Pond Link PreparedbyVanasseHangenBrustlin,Inc., Printed2/2/2011 HydroCAD9.00 s/n01237 2009HydroCADSoftwareSolutionsLLC
K-9
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0922806ProposedConditionsALTB4 TypeIII24hr100Year Rainfall=8.70" PreparedbyVanasseHangenBrustlin,Inc. Printed 2/2/2011 HydroCAD9.00 s/n01237 2009HydroCADSoftwareSolutionsLLC Page2
Timespan=5.0020.00hrs,dt=0.05hrs,301points RunoffbySCSTR20method,UH=SCS
ReachroutingbyStorInd+Transmethod PondroutingbyStorIndmethod
Subcatchment1BBN:BuckeyeBrook RunoffArea=597.900ac 43.30%Impervious RunoffDepth>4.44"FlowLength=8,175' Tc=47.8min CN=68 Runoff=1,514.28cfs 221.151af
Subcatchment2WP:WarwickPond RunoffArea=27.200ac 47.43%Impervious RunoffDepth>4.36"FlowLength=1,213' Tc=23.8min CN=67 Runoff=93.73cfs 9.882af
Subcatchment3BBS:BuckeyeBrook RunoffArea=458.200ac 42.89%Impervious RunoffDepth>4.44"FlowLength=4,962' Tc=44.1min CN=68 Runoff=1,214.47cfs 169.708af
Subcatchment4TB:TuscatucketBrook RunoffArea=160.500ac 30.90%Impervious RunoffDepth>3.18"FlowLength=2,031' Tc=44.7min CN=57 Runoff=299.58cfs 42.520af
Subcatchment5CB:CallahanBrook RunoffArea=115.600ac 18.94%Impervious RunoffDepth>2.87"FlowLength=1,566' Tc=26.6min CN=54 Runoff=245.21cfs 27.607af
LinkDP1:ToBuckeyeBrookNorth Inflow=1,514.28cfs 221.151af Primary=1,514.28cfs 221.151af
LinkDP2:ToWarwickPond Inflow=93.73cfs 9.882af Primary=93.73cfs 9.882af
LinkDP3:ToBuckeyeBrookSouth Inflow=1,214.47cfs 169.708af Primary=1,214.47cfs 169.708af
LinkDP4:ToTuscatucketBrook Inflow=299.58cfs 42.520af Primary=299.58cfs 42.520af
LinkDP5:ToCallahanBrook Inflow=245.21cfs 27.607af Primary=245.21cfs 27.607af
TotalRunoffArea=1,359.400ac RunoffVolume=470.869af AverageRunoffDepth=4.16" 60.29%Pervious=819.600ac 39.71%Impervious=539.800ac
K-10
http:Primary=245.21http:Inflow=245.21http:Primary=299.58http:Inflow=299.58http:Primary=1,214.47http:Inflow=1,214.47http:Primary=93.73http:Inflow=93.73http:Primary=1,514.28http:Inflow=1,514.28http:Runoff=245.21http:Depth>2.87http:Runoff=299.58http:Depth>3.18http:Runoff=1,214.47http:Depth>4.44http:Runoff=93.73http:Depth>4.36http:Runoff=1,514.28http:Depth>4.44http:span=5.0020.00http:Rainfall=8.70
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0922806ProposedConditionsALTB4 TypeIII24hr100Year Rainfall=8.70" PreparedbyVanasseHangenBrustlin,Inc. Printed 2/2/2011 HydroCAD9.00 s/n01237 2009HydroCADSoftwareSolutionsLLC Page3
SummaryforSubcatchment1BBN:BuckeyeBrookNorth
Runoff = 1,514.28cfs@ 12.66hrs,Volume= 221.151af,Depth> 4.44"
RunoffbySCSTR20method,UH=SCS,TimeSpan=5.0020.00hrs,dt=0.05hrs TypeIII24hr100Year Rainfall=8.70"
Area(ac) CN Description 258.900 98 Pavedparking,HSGA 182.200 43 Woods/grasscomb.,Fair,HSGA 8.500 76 Woods/grasscomb.,Fair,HSGC 11.500 82 Woods/grasscomb.,Fair,HSGD 136.800 43 Woods/grasscomb.,Fair,HSGA 597.900 68 WeightedAverage 339.000 56.70%PerviousArea 258.900 43.30%ImperviousArea
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.6 50 0.0050 0.09 SheetFlow,
Grass:Short n=0.150 P2=3.30" 1.5 194 0.0110 2.13 ShallowConcentratedFlow,
Paved Kv=20.3fps 36.7 7,931 0.0025 3.60 11.31 PipeChannel,
24.0" Round Area=3.1sf Perim=6.3' r=0.50' n=0.013 Concretepipe,bends&connections
47.8 8,175 Total
SummaryforSubcatchment2WP:WarwickPond
Runoff = 93.73cfs@ 12.33hrs,Volume= 9.882af,Depth> 4.36"
RunoffbySCSTR20method,UH=SCS,TimeSpan=5.0020.00hrs,dt=0.05hrs TypeIII24hr100Year Rainfall=8.70"
Area(ac) CN Description 12.900 98 Pavedparking,HSGA 0.400 39 >75%Grasscover,Good,HSGA
* 13.900 39 >75%Grasscover,Good,HSGA(assumed) 27.200 67 WeightedAverage 14.300 52.57%PerviousArea 12.900 47.43%ImperviousArea
K-11
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0922806ProposedConditionsALTB4 TypeIII24hr100Year Rainfall=8.70" PreparedbyVanasseHangenBrustlin,Inc. Printed 2/2/2011 HydroCAD9.00 s/n01237 2009HydroCADSoftwareSolutionsLLC Page4
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.6 100 0.0030 0.08 SheetFlow,
Grass:Short n=0.150 P2=3.30" 0.3 50 0.0340 2.97 ShallowConcentratedFlow,
Unpaved Kv=16.1fps 2.9 1,063 0.0070 6.02 18.93 PipeChannel,
24.0" Round Area=3.1sf Perim=6.3' r=0.50' n=0.013 Concretepipe,bends&connections
23.8 1,213 Total
SummaryforSubcatchment3BBS:BuckeyeBrookSouth
Runoff = 1,214.47cfs@ 12.61hrs,Volume= 169.708af,Depth> 4.44"
RunoffbySCSTR20method,UH=SCS,TimeSpan=5.0020.00hrs,dt=0.05hrs TypeIII24hr100Year Rainfall=8.70"
Area(ac) CN Description 196.500 98 Pavedparking,HSGA 41.900 39 >75%Grasscover,Good,HSGA 8.500 61 >75%Grasscover,Good,HSGB 33.900 74 >75%Grasscover,Good,HSGC 5.400 80 >75%Grasscover,Good,HSGD
172.000 39 >75%Grasscover,Good,HSGA 458.200 68 WeightedAverage 261.700 57.11%PerviousArea 196.500 42.89%ImperviousArea
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.1 100 0.0140 0.15 SheetFlow,
Grass:Short n=0.150 P2=3.30" 15.7 1,126 0.0055 1.19 ShallowConcentratedFlow,
Unpaved Kv=16.1fps 17.3 3,736 0.0025 3.60 11.31 PipeChannel,
24.0" Round Area=3.1sf Perim=6.3' r=0.50' n=0.013 Concretepipe,bends&connections
44.1 4,962 Total
SummaryforSubcatchment4TB:TuscatucketBrook
Runoff = 299.58cfs@ 12.64hrs,Volume= 42.520af,Depth> 3.18"
RunoffbySCSTR20method,UH=SCS,TimeSpan=5.0020.00hrs,dt=0.05hrs TypeIII24hr100Year Rainfall=8.70"
K-12
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0922806ProposedConditionsALTB4 TypeIII24hr100Year Rainfall=8.70" PreparedbyVanasseHangenBrustlin,Inc. Printed 2/2/2011 HydroCAD9.00 s/n01237 2009HydroCADSoftwareSolutionsLLC Page5
Area(ac) CN Description 49.600 98 Pavedparking,HSGA 34.600 39 >75%Grasscover,Good,HSGA 0.100 61 >75%Grasscover,Good,HSGB
* 76.200 39 >75%Grasscover,Good,HSGA(assumed) 160.500 57 WeightedAverage 110.900 69.10%PerviousArea 49.600 30.90%ImperviousArea
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.6 100 0.0030 0.08 SheetFlow,
Grass:Short n=0.150 P2=3.30" 22.9 1,498 0.0046 1.09 ShallowConcentratedFlow,
Unpaved Kv=16.1fps 1.2 433 0.0067 5.89 18.52 PipeChannel,
24.0" Round Area=3.1sf Perim=6.3' r=0.50' n=0.013 Concretepipe,bends&connections
44.7 2,031 Total
SummaryforSubcatchment5CB:CallahanBrook
Runoff = 245.21cfs@ 12.40hrs,Volume= 27.607af,Depth> 2.87"
RunoffbySCSTR20method,UH=SCS,TimeSpan=5.0020.00hrs,dt=0.05hrs TypeIII24hr100Year Rainfall=8.70"
Area(ac) CN Description 21.900 98 Pavedparking,HSGA 88.200 43 Woods/grasscomb.,Fair,HSGA 0.800 65 Woods/grasscomb.,Fair,HSGB 4.700 43 Woods/grasscomb.,Fair,HSGA
115.600 54 WeightedAverage 93.700 81.06%PerviousArea 21.900 18.94%ImperviousArea
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.6 100 0.0060 0.11 SheetFlow,
Grass:Short n=0.150 P2=3.30" 7.8 585 0.0038 1.25 ShallowConcentratedFlow,
Paved Kv=20.3fps 3.2 881 0.0040 4.55 14.31 PipeChannel,
24.0" Round Area=3.1sf Perim=6.3' r=0.50' n=0.013 Concretepipe,bends&connections
26.6 1,566 Total
K-13
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0922806ProposedConditionsALTB4 TypeIII24hr100Year Rainfall=8.70" PreparedbyVanasseHangenBrustlin,Inc. Printed 2/2/2011 HydroCAD9.00 s/n01237 2009HydroCADSoftwareSolutionsLLC Page6
SummaryforLinkDP1:ToBuckeyeBrookNorth
InflowArea= 597.900ac, 43.30%Impervious,InflowDepth> 4.44" for 100Yearevent Inflow = 1,514.28cfs@ 12.66hrs,Volume= 221.151af Primary = 1,514.28cfs@ 12.66hrs,Volume= 221.151af,Atten=0%,Lag=0.0min
Primaryoutflow=Inflow,TimeSpan=5.0020.00hrs,dt=0.05hrs
SummaryforLinkDP2:ToWarwickPond
InflowArea= 27.200ac, 47.43%Impervious,InflowDepth> 4.36" for 100Yearevent Inflow = 93.73cfs@ 12.33hrs,Volume= 9.882af Primary = 93.73cfs@ 12.33hrs,Volume= 9.882af,Atten=0%,Lag=0.0min
Primaryoutflow=Inflow,TimeSpan=5.0020.00hrs,dt=0.05hrs
SummaryforLinkDP3:ToBuckeyeBrookSouth
InflowArea= 458.200ac, 42.89%Impervious,InflowDepth> 4.44" for 100Yearevent Inflow = 1,214.47cfs@ 12.61hrs,Volume= 169.708af Primary = 1,214.47cfs@ 12.61hrs,Volume= 169.708af,Atten=0%,Lag=0.0min
Primaryoutflow=Inflow,TimeSpan=5.0020.00hrs,dt=0.05hrs
SummaryforLinkDP4:ToTuscatucketBrook
InflowArea= 160.500ac, 30.90%Impervious,InflowDepth> 3.18" for 100Yearevent Inflow = 299.58cfs@ 12.64hrs,Volume= 42.520af Primary = 299.58cfs@ 12.64hrs,Volume= 42.520af,Atten=0%,Lag=0.0min
Primaryoutflow=Inflow,TimeSpan=5.0020.00hrs,dt=0.05hrs
SummaryforLinkDP5:ToCallahanBrook
InflowArea= 115.600ac, 18.94%Impervious,InflowDepth> 2.87" for 100Yearevent Inflow = 245.21cfs@ 12.40hrs,Volume= 27.607af Primary = 245.21cfs@ 12.40hrs,Volume= 27.607af,Atten=0%,Lag=0.0min
Primaryoutflow=Inflow,TimeSpan=5.0020.00hrs,dt=0.05hrs
K-14
http:5.0020.00http:5.0020.00http:5.0020.00http:1,214.47http:1,214.47http:5.0020.00http:5.0020.00http:1,514.28http:1,514.28http:Rainfall=8.70
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T.F. Green Airport Improvement Program Environmental Impact Statement and Final Section 4(f) Evaluation
K.2 Pond Sizing Analysis
The following graphs provide the pond sizing analysis for the Preferred Alternative (Alternative B4). Included are the Buckeye Brook North drainage area, the Buckeye Brook South drainage area, the Warwick Pond drainage area, and the Tuscatucket Brook drainage area.
Appendix K Water Quality K-15 July 2011 \\Mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_App_K_WQ\PVD_Appendix_K_WQ_JUL_2011.doc
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T.F. Green Airport Improvement Program Environmental Impact Statement and Final Section 4(f) Evaluation
Buckeye Brook North Drainage Area - Pond Sizing
Source: HydroCAD TR-20 Pond Sizing Analysis
Appendix K Water Quality K-16 July 2011 \\Mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_App_K_WQ\PVD_Appendix_K_WQ_JUL_2011.doc
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T.F. Green Airport Improvement Program Environmental Impact Statement and Final Section 4(f) Evaluation
Buckeye Brook South Drainage Area Pond Sizing
Source: HydroCAD TR-20 Pond Sizing Analysis
Appendix K Water Quality K-17 July 2011 \\Mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_App_K_WQ\PVD_Appendix_K_WQ_JUL_2011.doc
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T.F. Green Airport Improvement Program Environmental Impact Statement and Final Section 4(f) Evaluation
Warwick Pond Drainage Area Pond Sizing
Source: HydroCAD TR-20 Pond Sizing Analysis
Appendix K Water Quality K-18 July 2011 \\Mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_App_K_WQ\PVD_Appendix_K_WQ_JUL_2011.doc
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T.F. Green Airport Improvement Program Environmental Impact Statement and Final Section 4(f) Evaluation
Tuscatucket Brook Drainage Area Pond Sizing
Source: HydroCAD TR-20 Pond Sizing Analysis
Appendix K Water Quality K-19 July 2011 \\Mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_App_K_WQ\PVD_Appendix_K_WQ_JUL_2011.doc
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T.F. Green Airport Improvement Program Environmental Impact Statement and Final Section 4(f) Evaluation
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T.F. Green Airport Improvement Program Environmental Impact Statement and Final Section 4(f) Evaluation
K.3 Water Quality Monitoring Data
The following tables provide water quality monitoring data for Outfalls 10A and 11A/12A from 2006 to 2010. According to RIAC, data from 2004 and 2005 are not available for these outfalls. Dissolved oxygen (DO) is also not available during this time period.
Appendix K Water Quality K-21 July 2011 \\Mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_App_K_WQ\PVD_Appendix_K_WQ_JUL_2011.doc
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T.F. Green Airport Improvement Program Environmental Impact Statement and Final Section 4(f) Evaluation
Table K.3-1 Water Quality at T.F. Green Airport Outfall 10A1,2,3
Oil & Propylene TSS2 BOD2 COD2 Grease glycol Iron
Date1 (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) VOCs (g/L) (mg/L) 9/14/2006 59
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T.F. Green Airport Improvement Program Environmental Impact Statement and Final Section 4(f) Evaluation
Table K.3-2 Water Quality at T.F. Green Airport Outfall 11A/12A1,2,3
Oil & Propylene TSS2 BOD2 COD2 Grease glycol Iron
Date1 (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) VOCs (g/L) (mg/L) 9/14/2006
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T.F. Green Airport Improvement Program Environmental Impact Statement and Final Section 4(f) Evaluation
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Appendix K: Water QualityTable of ContentsK.1 HydroCAD CalculationsK.2 Pond Sizing AnalysisK.3 Water Quality Monitoring Data