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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
Appendix K – Water Quality K-i July 2011 \\Mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_App_K_WQ\PVD_Appendix_K_WQ_JUL_2011.doc
eheacockSticky NoteMarked set by eheacock
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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 Quality K-ii 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
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).
Appendix K – Water Quality K-1 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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Appendix K – Water Quality K-2 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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EX1BBN DP1
Buckeye Brook North To Buckeye Brook North
EX2WP DP2
Warwick Pond To Warwick Pond
EX3BBS DP3
Buckeye Brook South To Buckeye Brook South
EX4TB DP4
Tuscatucket Brook To Tuscatucket Brook
EX5CB DP5
Callahan Brook To Callahan Brook
Drainage Diagram for 0922806 Existing ConditionsSubcat Reach Pond Link Prepared by Vanasse Hangen Brustlin, Inc., Printed 2/2/2011
HydroCAD® 9.00 s/n 01237 © 2009 HydroCAD Software Solutions LLC
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0922806 Existing Conditions Type III 24hr 100 Year Rainfall=8.70" Prepared by Vanasse Hangen Brustlin, Inc. Printed 2/2/2011 HydroCAD® 9.00 s/n 01237 © 2009 HydroCAD Software Solutions LLC Page 2
Time span=5.0020.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR20 method, UH=SCS
Reach routing by StorInd+Trans method Pond routing by StorInd method
Subcatchment EX1BBN: Buckeye Brook Runoff Area=598.000 ac 39.98% Impervious Runoff Depth>4.21" Flow Length=8,175' Tc=47.8 min CN=66 Runoff=1,436.88 cfs 209.596 af
Subcatchment EX2WP: Warwick Pond Runoff Area=23.900 ac 48.95% Impervious Runoff Depth>4.48" Flow Length=1,213' Tc=23.8 min CN=68 Runoff=84.51 cfs 8.916 af
Subcatchment EX3BBS: Buckeye Brook Runoff Area=458.500 ac 33.13% Impervious Runoff Depth>3.75" Flow Length=4,962' Tc=44.1 min CN=62 Runoff=1,025.46 cfs 143.269 af
Subcatchment EX4TB: Tuscatucket Runoff Area=145.600 ac 24.04% Impervious Runoff Depth>2.73" Flow Length=2,031' Tc=44.7 min CN=53 Runoff=230.28 cfs 33.143 af
Subcatchment EX5CB: Callahan Brook Runoff Area=132.900 ac 19.49% Impervious Runoff Depth>2.87" Flow Length=1,566' Tc=26.6 min CN=54 Runoff=281.90 cfs 31.738 af
Link DP1: To Buckeye Brook North Inflow=1,436.88 cfs 209.596 af Primary=1,436.88 cfs 209.596 af
Link DP2: To Warwick Pond Inflow=84.51 cfs 8.916 af Primary=84.51 cfs 8.916 af
Link DP3: To Buckeye Brook South Inflow=1,025.46 cfs 143.269 af Primary=1,025.46 cfs 143.269 af
Link DP4: To Tuscatucket Brook Inflow=230.28 cfs 33.143 af Primary=230.28 cfs 33.143 af
Link DP5: To Callahan Brook Inflow=281.90 cfs 31.738 af Primary=281.90 cfs 31.738 af
Total Runoff Area = 1,358.900 ac Runoff Volume = 426.662 af Average Runoff Depth = 3.77" 65.88% Pervious = 895.300 ac 34.12% Impervious = 463.600 ac
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0922806 Existing Conditions Type III 24hr 100 Year Rainfall=8.70" Prepared by Vanasse Hangen Brustlin, Inc. Printed 2/2/2011 HydroCAD® 9.00 s/n 01237 © 2009 HydroCAD Software Solutions LLC Page 3
Summary for Subcatchment EX1BBN: Buckeye Brook North
Runoff = 1,436.88 cfs @ 12.67 hrs, Volume= 209.596 af, Depth> 4.21"
Runoff by SCS TR20 method, UH=SCS, Time Span= 5.0020.00 hrs, dt= 0.05 hrs Type III 24hr 100 Year Rainfall=8.70"
Area (ac) CN Description 239.100 98 Paved parking, HSG A 180.600 43 Woods/grass comb., Fair, HSG A
8.500 76 Woods/grass comb., Fair, HSG C 11.500 82 Woods/grass comb., Fair, HSG D
158.300 43 Woods/grass comb., Fair, HSG A 598.000 66 Weighted Average 358.900 60.02% Pervious Area 239.100 39.98% Impervious Area
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs)
9.6 50 0.0050 0.09 Sheet Flow,
Grass: Short n= 0.150 P2= 3.30"
1.5 194 0.0110 2.13 Shallow Concentrated Flow,
Paved Kv= 20.3 fps
36.7 7,931 0.0025 3.60 11.31 Pipe Channel,
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.013 Concrete pipe, bends & connections
47.8 8,175 Total
Summary for Subcatchment EX2WP: Warwick Pond
Runoff = 84.51 cfs @ 12.33 hrs, Volume= 8.916 af, Depth> 4.48"
Runoff by SCS TR20 method, UH=SCS, Time Span= 5.0020.00 hrs, dt= 0.05 hrs Type III 24hr 100 Year Rainfall=8.70"
Area (ac) CN Description 11.700 98 Paved parking, HSG A
0.400 39 >75% Grass cover, Good, HSG A * 11.800 39 >75% Grass cover, Good, HSG A (assumed)
23.900 68 Weighted Average 12.200 51.05% Pervious Area 11.700 48.95% Impervious Area
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0922806 Existing Conditions Type III 24hr 100 Year Rainfall=8.70" Prepared by Vanasse Hangen Brustlin, Inc. Printed 2/2/2011 HydroCAD® 9.00 s/n 01237 © 2009 HydroCAD Software Solutions LLC Page 4
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.6 100 0.0030 0.08 Sheet Flow,
Grass: Short n= 0.150 P2= 3.30" 0.3 50 0.0340 2.97 Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps 2.9 1,063 0.0070 6.02 18.93 Pipe Channel,
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.013 Concrete pipe, bends & connections
23.8 1,213 Total
Summary for Subcatchment EX3BBS: Buckeye Brook South
Runoff = 1,025.46 cfs @ 12.62 hrs, Volume= 143.269 af, Depth> 3.75"
Runoff by SCS TR20 method, UH=SCS, Time Span= 5.0020.00 hrs, dt= 0.05 hrs Type III 24hr 100 Year Rainfall=8.70"
Area (ac) CN Description 151.900 98 Paved parking, HSG A
47.000 39 >75% Grass cover, Good, HSG A 9.200 61 >75% Grass cover, Good, HSG B
35.800 74 >75% Grass cover, Good, HSG C 5.400 80 >75% Grass cover, Good, HSG D
209.200 39 >75% Grass cover, Good, HSG A 458.500 62 Weighted Average 306.600 66.87% Pervious Area 151.900 33.13% Impervious Area
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.1 100 0.0140 0.15 Sheet Flow,
Grass: Short n= 0.150 P2= 3.30" 15.7 1,126 0.0055 1.19 Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps 17.3 3,736 0.0025 3.60 11.31 Pipe Channel,
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.013 Concrete pipe, bends & connections
44.1 4,962 Total
Summary for Subcatchment EX4TB: Tuscatucket Brook
Runoff = 230.28 cfs @ 12.66 hrs, Volume= 33.143 af, Depth> 2.73"
Runoff by SCS TR20 method, UH=SCS, Time Span= 5.0020.00 hrs, dt= 0.05 hrs Type III 24hr 100 Year Rainfall=8.70"
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0922806 Existing Conditions Type III 24hr 100 Year Rainfall=8.70" Prepared by Vanasse Hangen Brustlin, Inc. Printed 2/2/2011 HydroCAD® 9.00 s/n 01237 © 2009 HydroCAD Software Solutions LLC Page 5
Area (ac) CN Description 35.000 98 Paved parking, HSG A 29.300 39 >75% Grass cover, Good, HSG A 81.300 39 >75% Grass cover, Good, HSG A
145.600 53 Weighted Average 110.600 75.96% Pervious Area
35.000 24.04% Impervious Area
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.6 100 0.0030 0.08 Sheet Flow,
Grass: Short n= 0.150 P2= 3.30" 22.9 1,498 0.0046 1.09 Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps 1.2 433 0.0067 5.89 18.52 Pipe Channel,
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.013 Concrete pipe, bends & connections
44.7 2,031 Total
Summary for Subcatchment EX5CB: Callahan Brook
Runoff = 281.90 cfs @ 12.40 hrs, Volume= 31.738 af, Depth> 2.87"
Runoff by SCS TR20 method, UH=SCS, Time Span= 5.0020.00 hrs, dt= 0.05 hrs Type III 24hr 100 Year Rainfall=8.70"
Area (ac) CN Description 25.900 98 Paved parking, HSG A 91.100 43 Woods/grass comb., Fair, HSG A
0.800 65 Woods/grass comb., Fair, HSG B 15.100 43 Woods/grass comb., Fair, HSG A
132.900 54 Weighted Average 107.000 80.51% Pervious Area
25.900 19.49% Impervious Area
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.6 100 0.0060 0.11 Sheet Flow,
Grass: Short n= 0.150 P2= 3.30" 7.8 585 0.0038 1.25 Shallow Concentrated Flow,
Paved Kv= 20.3 fps 3.2 881 0.0040 4.55 14.31 Pipe Channel,
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.013 Concrete pipe, bends & connections
26.6 1,566 Total
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0922806 Existing Conditions Type III 24hr 100 Year Rainfall=8.70" Prepared by Vanasse Hangen Brustlin, Inc. Printed 2/2/2011 HydroCAD® 9.00 s/n 01237 © 2009 HydroCAD Software Solutions LLC Page 6
Summary for Link DP1: To Buckeye Brook North
Inflow Area = 598.000 ac, 39.98% Impervious, Inflow Depth > 4.21" for 100 Year event Inflow = 1,436.88 cfs @ 12.67 hrs, Volume= 209.596 af Primary = 1,436.88 cfs @ 12.67 hrs, Volume= 209.596 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 5.0020.00 hrs, dt= 0.05 hrs
Summary for Link DP2: To Warwick Pond
Inflow Area = 23.900 ac, 48.95% Impervious, Inflow Depth > 4.48" for 100 Year event Inflow = 84.51 cfs @ 12.33 hrs, Volume= 8.916 af Primary = 84.51 cfs @ 12.33 hrs, Volume= 8.916 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 5.0020.00 hrs, dt= 0.05 hrs
Summary for Link DP3: To Buckeye Brook South
Inflow Area = 458.500 ac, 33.13% Impervious, Inflow Depth > 3.75" for 100 Year event Inflow = 1,025.46 cfs @ 12.62 hrs, Volume= 143.269 af Primary = 1,025.46 cfs @ 12.62 hrs, Volume= 143.269 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 5.0020.00 hrs, dt= 0.05 hrs
Summary for Link DP4: To Tuscatucket Brook
Inflow Area = 145.600 ac, 24.04% Impervious, Inflow Depth > 2.73" for 100 Year event Inflow = 230.28 cfs @ 12.66 hrs, Volume= 33.143 af Primary = 230.28 cfs @ 12.66 hrs, Volume= 33.143 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 5.0020.00 hrs, dt= 0.05 hrs
Summary for Link DP5: To Callahan Brook
Inflow Area = 132.900 ac, 19.49% Impervious, Inflow Depth > 2.87" for 100 Year event Inflow = 281.90 cfs @ 12.40 hrs, Volume= 31.738 af Primary = 281.90 cfs @ 12.40 hrs, Volume= 31.738 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 5.0020.00 hrs, dt= 0.05 hrs
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1BBN
Buckeye Brook North
3BBS
Buckeye Brook South
4TB
Tuscatucket Brook
5CB
Callahan Brook
DP1
To Buckeye Brook North
2WP
Warwick Pond
DP2
To Warwick Pond
DP3
To Buckeye Brook
South
DP4
To Tuscatucket Brook
DP5
To Callahan Brook
Drainage Diagram for 0922806 Proposed Conditions ALT B4Subcat Reach Pond Link Prepared by Vanasse Hangen Brustlin, Inc., Printed 2/2/2011 HydroCAD® 9.00 s/n 01237 © 2009 HydroCAD Software Solutions LLC
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0922806 Proposed Conditions ALT B4 Type III 24hr 100 Year Rainfall=8.70" Prepared by Vanasse Hangen Brustlin, Inc. Printed 2/2/2011 HydroCAD® 9.00 s/n 01237 © 2009 HydroCAD Software Solutions LLC Page 2
Time span=5.0020.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR20 method, UH=SCS
Reach routing by StorInd+Trans method Pond routing by StorInd method
Subcatchment 1BBN: Buckeye Brook Runoff Area=597.900 ac 43.30% Impervious Runoff Depth>4.44" Flow Length=8,175' Tc=47.8 min CN=68 Runoff=1,514.28 cfs 221.151 af
Subcatchment 2WP: Warwick Pond Runoff Area=27.200 ac 47.43% Impervious Runoff Depth>4.36" Flow Length=1,213' Tc=23.8 min CN=67 Runoff=93.73 cfs 9.882 af
Subcatchment 3BBS: Buckeye Brook Runoff Area=458.200 ac 42.89% Impervious Runoff Depth>4.44" Flow Length=4,962' Tc=44.1 min CN=68 Runoff=1,214.47 cfs 169.708 af
Subcatchment 4TB: Tuscatucket Brook Runoff Area=160.500 ac 30.90% Impervious Runoff Depth>3.18" Flow Length=2,031' Tc=44.7 min CN=57 Runoff=299.58 cfs 42.520 af
Subcatchment 5CB: Callahan Brook Runoff Area=115.600 ac 18.94% Impervious Runoff Depth>2.87" Flow Length=1,566' Tc=26.6 min CN=54 Runoff=245.21 cfs 27.607 af
Link DP1: To Buckeye Brook North Inflow=1,514.28 cfs 221.151 af Primary=1,514.28 cfs 221.151 af
Link DP2: To Warwick Pond Inflow=93.73 cfs 9.882 af Primary=93.73 cfs 9.882 af
Link DP3: To Buckeye Brook South Inflow=1,214.47 cfs 169.708 af Primary=1,214.47 cfs 169.708 af
Link DP4: To Tuscatucket Brook Inflow=299.58 cfs 42.520 af Primary=299.58 cfs 42.520 af
Link DP5: To Callahan Brook Inflow=245.21 cfs 27.607 af Primary=245.21 cfs 27.607 af
Total Runoff Area = 1,359.400 ac Runoff Volume = 470.869 af Average Runoff Depth = 4.16" 60.29% Pervious = 819.600 ac 39.71% Impervious = 539.800 ac
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0922806 Proposed Conditions ALT B4 Type III 24hr 100 Year Rainfall=8.70" Prepared by Vanasse Hangen Brustlin, Inc. Printed 2/2/2011 HydroCAD® 9.00 s/n 01237 © 2009 HydroCAD Software Solutions LLC Page 3
Summary for Subcatchment 1BBN: Buckeye Brook North
Runoff = 1,514.28 cfs @ 12.66 hrs, Volume= 221.151 af, Depth> 4.44"
Runoff by SCS TR20 method, UH=SCS, Time Span= 5.0020.00 hrs, dt= 0.05 hrs Type III 24hr 100 Year Rainfall=8.70"
Area (ac) CN Description 258.900 98 Paved parking, HSG A 182.200 43 Woods/grass comb., Fair, HSG A 8.500 76 Woods/grass comb., Fair, HSG C 11.500 82 Woods/grass comb., Fair, HSG D 136.800 43 Woods/grass comb., Fair, HSG A 597.900 68 Weighted Average 339.000 56.70% Pervious Area 258.900 43.30% Impervious Area
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.6 50 0.0050 0.09 Sheet Flow,
Grass: Short n= 0.150 P2= 3.30" 1.5 194 0.0110 2.13 Shallow Concentrated Flow,
Paved Kv= 20.3 fps 36.7 7,931 0.0025 3.60 11.31 Pipe Channel,
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.013 Concrete pipe, bends & connections
47.8 8,175 Total
Summary for Subcatchment 2WP: Warwick Pond
Runoff = 93.73 cfs @ 12.33 hrs, Volume= 9.882 af, Depth> 4.36"
Runoff by SCS TR20 method, UH=SCS, Time Span= 5.0020.00 hrs, dt= 0.05 hrs Type III 24hr 100 Year Rainfall=8.70"
Area (ac) CN Description 12.900 98 Paved parking, HSG A 0.400 39 >75% Grass cover, Good, HSG A
* 13.900 39 >75% Grass cover, Good, HSG A (assumed) 27.200 67 Weighted Average 14.300 52.57% Pervious Area 12.900 47.43% Impervious Area
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0922806 Proposed Conditions ALT B4 Type III 24hr 100 Year Rainfall=8.70" Prepared by Vanasse Hangen Brustlin, Inc. Printed 2/2/2011 HydroCAD® 9.00 s/n 01237 © 2009 HydroCAD Software Solutions LLC Page 4
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.6 100 0.0030 0.08 Sheet Flow,
Grass: Short n= 0.150 P2= 3.30" 0.3 50 0.0340 2.97 Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps 2.9 1,063 0.0070 6.02 18.93 Pipe Channel,
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.013 Concrete pipe, bends & connections
23.8 1,213 Total
Summary for Subcatchment 3BBS: Buckeye Brook South
Runoff = 1,214.47 cfs @ 12.61 hrs, Volume= 169.708 af, Depth> 4.44"
Runoff by SCS TR20 method, UH=SCS, Time Span= 5.0020.00 hrs, dt= 0.05 hrs Type III 24hr 100 Year Rainfall=8.70"
Area (ac) CN Description 196.500 98 Paved parking, HSG A 41.900 39 >75% Grass cover, Good, HSG A 8.500 61 >75% Grass cover, Good, HSG B 33.900 74 >75% Grass cover, Good, HSG C 5.400 80 >75% Grass cover, Good, HSG D
172.000 39 >75% Grass cover, Good, HSG A 458.200 68 Weighted Average 261.700 57.11% Pervious Area 196.500 42.89% Impervious Area
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.1 100 0.0140 0.15 Sheet Flow,
Grass: Short n= 0.150 P2= 3.30" 15.7 1,126 0.0055 1.19 Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps 17.3 3,736 0.0025 3.60 11.31 Pipe Channel,
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.013 Concrete pipe, bends & connections
44.1 4,962 Total
Summary for Subcatchment 4TB: Tuscatucket Brook
Runoff = 299.58 cfs @ 12.64 hrs, Volume= 42.520 af, Depth> 3.18"
Runoff by SCS TR20 method, UH=SCS, Time Span= 5.0020.00 hrs, dt= 0.05 hrs Type III 24hr 100 Year Rainfall=8.70"
K-12
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0922806 Proposed Conditions ALT B4 Type III 24hr 100 Year Rainfall=8.70" Prepared by Vanasse Hangen Brustlin, Inc. Printed 2/2/2011 HydroCAD® 9.00 s/n 01237 © 2009 HydroCAD Software Solutions LLC Page 5
Area (ac) CN Description 49.600 98 Paved parking, HSG A 34.600 39 >75% Grass cover, Good, HSG A 0.100 61 >75% Grass cover, Good, HSG B
* 76.200 39 >75% Grass cover, Good, HSG A (assumed) 160.500 57 Weighted Average 110.900 69.10% Pervious Area 49.600 30.90% Impervious Area
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.6 100 0.0030 0.08 Sheet Flow,
Grass: Short n= 0.150 P2= 3.30" 22.9 1,498 0.0046 1.09 Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps 1.2 433 0.0067 5.89 18.52 Pipe Channel,
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.013 Concrete pipe, bends & connections
44.7 2,031 Total
Summary for Subcatchment 5CB: Callahan Brook
Runoff = 245.21 cfs @ 12.40 hrs, Volume= 27.607 af, Depth> 2.87"
Runoff by SCS TR20 method, UH=SCS, Time Span= 5.0020.00 hrs, dt= 0.05 hrs Type III 24hr 100 Year Rainfall=8.70"
Area (ac) CN Description 21.900 98 Paved parking, HSG A 88.200 43 Woods/grass comb., Fair, HSG A 0.800 65 Woods/grass comb., Fair, HSG B 4.700 43 Woods/grass comb., Fair, HSG A
115.600 54 Weighted Average 93.700 81.06% Pervious Area 21.900 18.94% Impervious Area
Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.6 100 0.0060 0.11 Sheet Flow,
Grass: Short n= 0.150 P2= 3.30" 7.8 585 0.0038 1.25 Shallow Concentrated Flow,
Paved Kv= 20.3 fps 3.2 881 0.0040 4.55 14.31 Pipe Channel,
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.013 Concrete pipe, bends & connections
26.6 1,566 Total
K-13
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0922806 Proposed Conditions ALT B4 Type III 24hr 100 Year Rainfall=8.70" Prepared by Vanasse Hangen Brustlin, Inc. Printed 2/2/2011 HydroCAD® 9.00 s/n 01237 © 2009 HydroCAD Software Solutions LLC Page 6
Summary for Link DP1: To Buckeye Brook North
Inflow Area = 597.900 ac, 43.30% Impervious, Inflow Depth > 4.44" for 100 Year event Inflow = 1,514.28 cfs @ 12.66 hrs, Volume= 221.151 af Primary = 1,514.28 cfs @ 12.66 hrs, Volume= 221.151 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 5.0020.00 hrs, dt= 0.05 hrs
Summary for Link DP2: To Warwick Pond
Inflow Area = 27.200 ac, 47.43% Impervious, Inflow Depth > 4.36" for 100 Year event Inflow = 93.73 cfs @ 12.33 hrs, Volume= 9.882 af Primary = 93.73 cfs @ 12.33 hrs, Volume= 9.882 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 5.0020.00 hrs, dt= 0.05 hrs
Summary for Link DP3: To Buckeye Brook South
Inflow Area = 458.200 ac, 42.89% Impervious, Inflow Depth > 4.44" for 100 Year event Inflow = 1,214.47 cfs @ 12.61 hrs, Volume= 169.708 af Primary = 1,214.47 cfs @ 12.61 hrs, Volume= 169.708 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 5.0020.00 hrs, dt= 0.05 hrs
Summary for Link DP4: To Tuscatucket Brook
Inflow Area = 160.500 ac, 30.90% Impervious, Inflow Depth > 3.18" for 100 Year event Inflow = 299.58 cfs @ 12.64 hrs, Volume= 42.520 af Primary = 299.58 cfs @ 12.64 hrs, Volume= 42.520 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 5.0020.00 hrs, dt= 0.05 hrs
Summary for Link DP5: To Callahan Brook
Inflow Area = 115.600 ac, 18.94% Impervious, Inflow Depth > 2.87" for 100 Year event Inflow = 245.21 cfs @ 12.40 hrs, Volume= 27.607 af Primary = 245.21 cfs @ 12.40 hrs, Volume= 27.607 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 5.0020.00 hrs, dt= 0.05 hrs
K-14
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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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Appendix K – Water Quality K-20 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
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 (µg/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 (µg/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 Quality K-24 July 2011 \\Mawatr\ev\09228.00\reports\FEIS_Final_July_2011\PVD_App_K_WQ\PVD_Appendix_K_WQ_JUL_2011.doc
Appendix K: Water QualityTable of ContentsK.1 HydroCAD CalculationsK.2 Pond Sizing AnalysisK.3 Water Quality Monitoring Data
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