20230818_HydraulicReport_BigSandy.pdf

PROJECT FW-TENN 12(1) -

Rehabilitation of Big Sandy Road (Route 012)

Final Hydraulic Report Revision 3

August 18, 2023

Project FW-TENN 12(1) Rehabilitation of Big Sandy Road (Route 012)

Eastern Federal Lands Highway Division Tennessee National Wildlife Refuge

AECOM ii

Quality information

Prepared by Checked by Approved by

Brandi Jackson, EI Meme Buscemi, PE Brian Anderson, PE

Revision History

Revision Revision date Details Authorized Name Position

0 10/11/2021 Draft

1 01/20/2022 Revised Pipe Sizes

2 07/21/2023 Revised Revetment & Culvert 7

3 08/18/2023 Revised Revetment & Culvert 13

Distribution List

# Hard Copies PDF Required Association / Company Name

N/A X EFLHD, FHWA

AECOM iii

Prepared for:

Sterling, Virginia

Prepared by:

AECOM

1000 Corporate Centre Drive

Suite 250

Franklin, TN 37067 aecom.com

615-771-2480

AECOM iv

Table of Contents

1. Introduction

2. General Site Conditions

3. Design Considerations

3.1 Culvert Design

3.2 Revetment Design

4. Stormwater Management

5. Utility Status

Appendix A – Culvert Watersheds .............................................................................................................................. A-1

Appendix B – Hydraulic Calculations ......................................................................................................................... B-1

Appendix C – Revetment Calculations ....................................................................................................................... C-1

Appendix D – Correspondence .................................................................................................................................. D-1

Appendix E – 25-YR Capacity Culvert Calculations ................................................................................................... E-1

Figures

1. Project Map…………………………………..…………………………………………………….……………………6

AECOM 5

1. Introduction

Federal Highway Administration (FHWA) is working on drainage and roadway improvements to 6.87-mile Big Sandy Road (Route 012) and six parking areas with aggregate surface course within Big Sandy Tennessee National Wildlife Refuge. The work includes slope grading, ditch reconditioning, removal and replacement of several pipe culverts, installation of one concrete box culvert, replacement of one water control structure, roadway resurfacing design, parking lot rehabilitation and installation, and erosion and sedimentation control. Figure 1 below shows the plan view of the roadway limits involved in this project.

AECOM 6

2. General Site Conditions

The site conditions change throughout the extent of the project limits. The four main site conditions encountered throughout the length of Big Sandy Road are mild slopes along farmland, through woods, and along water bodies, and steep slopes through woods.

There are over 30 water crossings throughout the project limits with multiple scenic stops along the way, including cemeteries, an overlook, hiking trails, and a lakeshore pull-off. A small portion of the roadway towards the end of the project limits runs in proximity to existing TVA powerlines.

AECOM 7

3. Design Considerations

3.1 Culvert Design

Most of the roadway is situated between a hillslope on one side and mildly sloping farmland on the other. This project consists of resizing and replacing 21 existing structures at stream crossings, as well as installing a newly proposed culvert at M.P. 5.96 to properly convey drainage from the hillside to Kentucky Lake and tributaries.

None of the culverts to be replaced in this project are located on FEMA studied streams.

Multiple culverts are located within the 100-year flood zone of Kentucky Lake, but there is not a defined floodway, so there are not any required No-Rise studies.

All structures are sized as directed by EFLHD and USFWS and are not designed according to guidelines presented in Chapter 7 of the Project Development and Design Manual. On June 30, 2021 AECOM received guidance from EFLHD Hydraulic Engineer Wendy Hiciano to replace all structures 24” or larger in-kind and upsize all structures less than 24” to 24” structures and include design exceptions.

The time of concentration for each drainage area was calculated using the NRCS TR-55 method. The provided culvert sizes were analyzed within HY-8 Version 6.70 to determine the capacity of each structure. The design flow rate of each predetermined structure size was determined to be the flow rate with headwater elevation no greater than the bottom of the aggregate base layer for the gravel roadway structure. As requested in the 30% design plans, Culvert 10 at the Farmer’s Pond along with the stand pipe will be replaced in-kind due to the age and condition of the structure. All pipes require an 18” minimum cover between top of pipe and top of roadway surface. The box culvert (Culvert 21) was designed to 25-YR capacity. Per guidance from EFLHD and USFWS, the top of the culvert was designed as the riding surface.

Culvert 4 has a concrete headwall at the outlet designed according to standard detail 601- 4.

Riprap aprons for all pipe culverts were designed according to standard detail C251-50 per direction from Hiciano on August 19, 2021. The geometry of the riprap apron at the outlet of Culvert 21 was designed according to HEC-14 and class 4 rip rap per EFLHD guidance.

EFLHD and USFWS directed AECOM on September 27, 2021 to design roadside ditches to match the design flow rate of the structure each ditch drains to, with a maximum design capacity of a 10-year storm. Ditches were designed to contain the calculated flow depth of the design storm with 0.5’ of freeboard. All ditches were designed as v ditches with 3:1 foreslopes and backslopes. Per Barron Crawford of USFWS, these ditches are only to be implemented in areas where removal of trees is not necessary to construct the ditch. In areas where trees may be disturbed, the backslope may be adjusted by the Construction Officer. Slopes steeper than 3:1 must be stabilized with erosion control blanket. The contractor is to establish slope limits and obtain owner confirmation of limits prior to performing grading in order to reduce the number of trees to be removed.

AECOM 8

On November 9, 2021 EFLHD and USFWS directed AECOM to install arch equivalent pipes in all locations where 1.5’ of cover was not achievable in order to reduce the number of locations that would require raising the roadway greater than 6 inches. These locations are Culverts 5, 7-9, 13-15, 19, and 22. The roadway profile is to be raised greater than 6 inches at culverts 5, 7, 9, 13, and 22.

AECOM met with FHWA and FWS via a Microsoft Teams Meeting to discuss another revision to the revetement design. These revisions would result in Culvert 13 having to be extended to 49 LF through the revetment surface. The outlet riprap apron was removed as the revetment surface will now serve as outlet protection for Culvert 13. Revised calculations have been included in Appendix B.

Calculations for 25-YR culvert capacity are located in Appendix E.

Eastern Federal Lands Highway Division Tennessee National Wildlife Refuge

AECOM 9

3.2 Revetment Design

AECOM originally designed 0.25 mile of shore protection to be installed along the northwestern shore of Kentucky Lake between MP 3.74 – MP 4.00 where continuous scouring is occurring. The main purpose of this design was for protection against an estimated 20° wave trajectory. The reinforcement surface was to be applied as fill material to avoid disturbing natural landscape and trees.

On May 11, 2023, Eastern Federal Lands Highway Division approved an amendment for the Big Sandy Route 12 roadway rehabilitation contract to revise the limits of the Kentucky Lake revetment from 1,300 feet to approximately 350 feet and shift the start of the revetment approximately 82 feet to the north. The direction came from Troy Littrell (Tennessee National Wildlife Refuge) to address TDEC mitigation concerns. A turbidity curtain will be installed to capture potential sediment from the construction of the revetment. The program includes directing the Contractor to construct the revetment during the Winter Pool elevation which reduces the exposure to washout from lake seasonal water levels.

On August 4, 2023, FHWA and FWS directed AECOM to revise the revetment limits by extending the shoreline protection beyond the anticipated wave height, to the roadway elevation of 370. This elevation increase will add additional protection to address anticipated flood elevations that have occurred at this site. The toe protection will be adjusted by moving higher on shore and burying the toe approximately 2-feet below grade. The new toe height will be at elevation 357, 2 feet below the summer pool elevation of 359. In addition, the revetment stone will be placed closer to the roadway embankment to enhance stabilization of the road. With the new elevation limits, AECOM revised the revetment to have a slope that varies from 2:1 to 4:1. The revetment design and typical section can be viewed on sheets D10 and D11 in the Final Plan Set dated August 17, 2023.

AECOM 10

4. Stormwater Management

No stormwater management facilities have been designed.

AECOM 11

5. Utility Status

No utilities are expected to be impacted by this project.

AECOM A-1

Appendix A – Culvert Watersheds

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DA1

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DA2

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DA3

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DA4

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DA5

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DA6

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DA7

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DA8*

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DA9

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DA10

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DA11

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DA12

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DA13

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DA14

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DA15

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DA16

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DA17

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DA18

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DA19

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DA20**

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SCALE IN FEET

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LEGEND

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FLOW PATH

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DA TO NO CHANGE CULVERTS

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DRAINAGE AREA

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BIG SANDY DRAIANGE AREA MAP

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*DA8 INCLUDES DA7

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**DA20 INCLUDES DA19

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SEE SHEET 6

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SEE SHEET 2

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SEE SHEET 3

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SEE SHEET 4

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SEE SHEET 5

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DRAINAGE MAP SHEET 1

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DA21

DA22

CULVERT 1 DA 19.2 AC Tc = 23.6 min

AutoCAD SHX Text CULVERT 2 DA 120.5 AC Tc = 29.9 min

AutoCAD SHX Text CULVERT 3 DA 33.8 AC Tc = 28.2 min

AutoCAD SHX Text CULVERT 4 DA 32.8 AC Tc = 21.9 min

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SCALE IN FEET

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LEGEND

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FLOW PATH

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DA TO NO CHANGE CULVERTS

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DRAINAGE AREA

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CULVERTS 1-4 DRAINAGE AREA & TIME OF CONCENTRATION MAP

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CULVERT

DRAINAGE MAP SHEET 2

CULVERT 5 DA 17.4 AC Tc = 29.5 min

AutoCAD SHX Text CULVERT 6 DA 17.4 AC Tc = 26.7 min

AutoCAD SHX Text CULVERT 7 DA 5.5 AC Tc = 23.3 min

AutoCAD SHX Text CULVERT 8 DA* 6.9 AC Tc = 23.4 min *INCLUDES DA7

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SCALE IN FEET

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LEGEND

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FLOW PATH

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DA TO NO CHANGE CULVERTS

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DRAINAGE AREA

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CULVERTS 5-8 DRAINAGE AREA & TIME OF CONCENTRATION MAP

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CULVERT

DRAINAGE MAP SHEET 3

CULVERT 10 DA 49.6 AC Tc = 33.2 min

AutoCAD SHX Text CULVERT 9 DA .65 AC Tc = 17.2 min

AutoCAD SHX Text CULVERT 11 DA 6.2 AC Tc = 20.1 min

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SCALE IN FEET

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LEGEND

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FLOW PATH

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DA TO NO CHANGE CULVERTS

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DRAINAGE AREA

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CULVERTS 9-11 DRAINAGE AREA & TIME OF CONCENTRATION MAP

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CULVERT

DRAINAGE MAP SHEET 4

CULVERT 16 DA 148.0 AC Tc = 25.9 min

AutoCAD SHX Text CULVERT 15 DA 4.9 AC Tc = 17.7 min

AutoCAD SHX Text CULVERT 14 DA 10.2 AC Tc = 31.0 min

AutoCAD SHX Text CULVERT 13 DA 1.6 AC Tc = 20.9 min

AutoCAD SHX Text CULVERT 12 DA 58.6 AC Tc = 36.7 min

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SCALE IN FEET

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LEGEND

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FLOW PATH

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DA TO NO CHANGE CULVERTS

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DRAINAGE AREA

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CULVERTS 12-16 DRAINAGE AREA & TIME OF CONCENTRATION MAP

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CULVERT

DRAINAGE MAP SHEET 5

CULVERT 17 DA 19.7 AC Tc = 29.8 min

AutoCAD SHX Text CULVERT 18 DA 14.7 AC Tc = 21.0 min

AutoCAD SHX Text CULVERT 19 DA 14.3 AC Tc = 25.5 min

AutoCAD SHX Text CULVERT 20 DA* 26.2 AC Tc = 26.1 min *INCLUDES DA19

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SCALE IN FEET

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LEGEND

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FLOW PATH

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DA TO NO CHANGE CULVERTS

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DRAINAGE AREA

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CULVERTS 17-22 DRAINAGE AREA & TIME OF CONCENTRATION MAP

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CULVERT

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DRAINAGE MAP SHEET 6

AutoCAD SHX Text CULVERT 22 2.5 AC Tc = 38.9 min

CULVERT 21 DA 387.0 AC Tc = 40.2 min

AECOM B-1

Appendix B – Hydraulic Calculations

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

1.62

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 295 48 48.5 25 Wetted Perimeter (ft) 88.2 49.12 39.15 23.11 Channel Slope (ft/ft) 0.1173 0.0759 0.0417 0.0208 Flow Length (ft) 162 224 528 336 Mannings n 0.048 0.048 0.048 0.048

Computed Tt (min) 0.11 0.44 1.20 1.19 2.95

23.6

Area = 19.2 Ac Q1 = 4.74

CN = 61 Q2 = 9.76

Tc = 23.6 min Q5 = 18.88

Q10 = 27.5 Q25 = 40.95

Total Sheet Flow Tt (min)

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

Computed Tt (min) 1.62 0.2551

Woodland

Culvert 1 - Time of Concentration Computation

0.8 3.7

0.09 19.05

Total Shallow Concentrated Flow Tt (min)

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

5.71

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 61 35 57 Wetted Perimeter (ft) 34 31 35 Channel Slope (ft/ft) 0.0507 0.0306 0.0196 Flow Length (ft) 631 872 2572 Mannings n 0.048 0.035 0.035

Computed Tt (min) 1.02 1.83 5.17 8.02

29.9

Area = 120.5 Ac Q1 = 12.5

CN = 57 Q2 = 31.82

Tc = 29.9 min Q5 = 71.8

Q10 = 112.26 Q25 = 178.37

Culvert 2 - Time of Concentration Computation

0.8 3.7

0.1351

Total Shallow Concentrated Flow Tt (min)

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

0.0966

Computed Tt (min) 5.71

Total Sheet Flow Tt (min) 16.19

Woodland

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

7.28

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 16.5 41 Wetted Perimeter (ft) 23 41 Channel Slope (ft/ft) 0.0558 0.0272 Flow Length (ft) 844 402 Mannings n 0.048 0.035

Computed Tt (min) 2.39 0.95 3.34

28.2

Area = 33.8 Ac Q1 = 20.08

CN = 70 Q2 = 31.77

Tc = 28.2 min Q5 = 50.66

Q10 = 67.38 Q25 = 92.4

Culvert 3 - Time of Concentration Computation

0.8

Total Shallow Concentrated Flow Tt (min)

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

5 5 510 171

0.0852 0.1522 Computed Tt (min) 5.82 1.46

3.7 0.1104

Total Sheet Flow Tt (min) 17.56

Woodland Woodland

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

3.08

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 907 1414 2598 Wetted Perimeter (ft) 105 146 265 Channel Slope (ft/ft) 0.0667 0.0398 0.029 Flow Length (ft) 585 565 777 Mannings n 0.048 0.048 0.04

Computed Tt (min) 0.29 0.34 0.45 1.07

21.9

Area = 32.8 Ac Q1 = 14.34

CN = 65 Q2 = 25.39

Tc = 21.9 min Q5 = 44.31

Q10 = 61.42 Q25 = 87.55

Culvert 4 - Time of Concentration Computation

0.8 3.7

0.1079 Total Sheet Flow Tt (min) 17.72

Woodland

Computed Tt (min) 3.08 Total Shallow Concentrated Flow Tt (min)

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

0.1854

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

3.09

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 138 136 Wetted Perimeter (ft) 105 78 Channel Slope (ft/ft) 0.0668 0.0235 Flow Length (ft) 942 500 Mannings n 0.048 0.04

Computed Tt (min) 1.63 1.00 2.64

29.5

Area = 17.4 Ac Q1 = 8.38

CN = 68 Q2 = 13.86

Tc = 29.5 min Q5 = 22.85

Q10 = 30.9 Q25 = 43.04

0.1766

Woodland

Culvert 5 - Time of Concentration Computation

0.8 3.7

0.052 Total Sheet Flow Tt (min) 23.73

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

Computed Tt (min) 3.09

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

3.57

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 17 73 26 Wetted Perimeter (ft) 27 65 43 Channel Slope (ft/ft) 0.0519 0.0488 0.0091 Flow Length (ft) 667 470 158 Mannings n 0.048 0.035 0.03

Computed Tt (min) 2.16 0.77 0.78 3.71

26.7

Area = 17.4 Ac Q1 = 11.6

CN = 71 Q2 = 18.05

Tc = 26.7 min Q5 = 28.34

Q10 = 37.4 Q25 = 50.89

Culvert 6 - Time of Concentration Computation

0.8 3.7

0.0858 Total Sheet Flow Tt (min) 19.42

Woodland Woodland 5 5

287 141

0.2099 0.1006

Computed Tt (min) 2.09 1.48 Total Shallow Concentrated Flow Tt (min)

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

1.15

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 73 306.5 Wetted Perimeter (ft) 56.5 134.5 Channel Slope (ft/ft) 0.0617 0.0384 Flow Length (ft) 463 301 Mannings n 0.048 0.04

Computed Tt (min) 0.84 0.40 1.24

23.3

Area = 5.5 Ac Q1 = 4.72

CN = 73 Q2 = 7.07

Tc = 23.3 min Q5 = 10.81

Q10 = 14.05 Q25 = 18.83

3.7

0.0717 Total Sheet Flow Tt (min) 20.86

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

0.0841 Computed Tt (min) 1.15

Total Shallow Concentrated Flow Tt (min)

Woodland

Culvert 7 - Time of Concentration Computation

0.8

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

1.15

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 73 306.5 Wetted Perimeter (ft) 56.5 134.5 Channel Slope (ft/ft) 0.0617 0.0335 Flow Length (ft) 463 435 Mannings n 0.045 0.04

Computed Tt (min) 0.79 0.61 1.41

23.4

Area = 6.9 Ac Q1 = 6.31

CN = 74 Q2 = 9.33

Tc = 23.4 min Q5 = 14.09

Q10 = 18.2 Q25 = 24.24

Culvert 8 - Time of Concentration Computation

0.8 3.7

0.0717 Total Sheet Flow Tt (min) 20.86

Woodland

Computed Tt (min) 1.15 Total Shallow Concentrated Flow Tt (min)

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

0.0841

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

2.00

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 5 Wetted Perimeter (ft) 12 Channel Slope (ft/ft) 0.006 Flow Length (ft) 250 Mannings n 0.035

Computed Tt (min) 2.30 2.30

17.2

Area = 0.65 Ac Q1 = 0.87

CN = 77 Q2 = 1.23

Tc = 17.2 min Q5 = 1.78

Q10 = 2.26 Q25 = 2.94

0.0324

Woodland

Culvert 9 - Time of Concentration Computation

0.8 3.7

0.06 Total Sheet Flow Tt (min) 12.87

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

Computed Tt (min) 2.00

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

5.80

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 1368 7712 Wetted Perimeter (ft) 233 673 Channel Slope (ft/ft) 0.0281 0.0117 Flow Length (ft) 1073 854 Mannings n 0.048 0.035

Computed Tt (min) 1.05 0.61 1.66

33.2

Area = 49.6 Ac Q1 = 38.14

CN = 75 Q2 = 55.85

Tc = 33.2 min Q5 = 83.52

Q10 = 107.41 Q25 = 142.5

Culvert 10 - Time of Concentration Computation

0.8 3.7

0.0426 Total Sheet Flow Tt (min) 25.70

Woodland

0.0676

Computed Tt (min) 5.80 Total Shallow Concentrated Flow Tt (min)

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Light Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

1.52

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 273 Wetted Perimeter (ft) 85 Channel Slope (ft/ft) 0.0425 Flow Length (ft) 883 Mannings n 0.045

Computed Tt (min) 0.99 0.99

20.1

Area = 6.2 Ac Q1 = 7.45

CN = 77 Q2 = 10.58

Tc = 20.1 min Q5 = 15.4

Q10 = 19.5 Q25 = 25.48

3.7

0.0276 Total Sheet Flow Tt (min) 17.56

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

0.0286 Computed Tt (min) 1.52

Total Shallow Concentrated Flow Tt (min)

Woodland

Culvert 11 - Time of Concentration Computation

0.4

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

3.44

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 462 418 3363 Wetted Perimeter (ft) 78 89 628 Channel Slope (ft/ft) 0.1752 0.0793 0.0269 Flow Length (ft) 371 201 2048 Mannings n 0.048 0.048 0.035

Computed Tt (min) 0.14 0.14 1.60 1.88

36.7

Area = 58.6 Ac Q1 = 7.82

CN = 59 Q2 = 17.41

Tc = 36.7 min Q5 = 36.08

Q10 = 54.51 Q25 = 83.9

Culvert 12 - Time of Concentration Computation

0.8 3.7

0.0259 Total Sheet Flow Tt (min) 31.35

Woodland

Computed Tt (min) 1.65 1.79 Total Shallow Concentrated Flow Tt (min)

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

Woodland 5 5

105 276

0.045 0.2637

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

2.84

CHANNEL FLOW SEGMENT

Flow Area (sq ft) Wetted Perimeter (ft) Channel Slope (ft/ft) Flow Length (ft) Mannings n

Computed Tt (min) 0.00

20.9

Area = 1.6 Ac Q1 = 0.12

CN = 55 Q2 = 0.39

Tc = 20.9 min Q5 = 0.98

Q10 = 1.59 Q25 = 2.6

0.1851

Woodland

Culvert 13 - Time of Concentration Computation

0.8 3.7

0.1024 Total Sheet Flow Tt (min) 18.09

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

Computed Tt (min) 2.84

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

3.49

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 691 397 Wetted Perimeter (ft) 114 194 Channel Slope (ft/ft) 0.1833 0.0798 Flow Length (ft) 299 238 Mannings n 0.048 0.04

Computed Tt (min) 0.11 0.23 0.34

31.0

Area = 10.2 Ac Q1 = 0.66

CN = 55 Q2 = 1.95

Tc = 31.0 min Q5 = 4.88

Q10 = 7.96 Q25 = 13.08

Culvert 14 - Time of Concentration Computation

0.8 3.7

0.0371 Total Sheet Flow Tt (min) 27.16

Woodland

0.1717

Computed Tt (min) 3.49 Total Shallow Concentrated Flow Tt (min)

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

1.97

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 266 Wetted Perimeter (ft) 94 Channel Slope (ft/ft) 0.1559 Flow Length (ft) 292 Mannings n 0.04

Computed Tt (min) 0.2 0.16

17.7

Area = 4.9 Ac Q1 = 0.42

CN = 55 Q2 = 1.38

Tc = 17.7 min Q5 = 3.46

Q10 = 5.6 Q25 = 9.13

3.7

0.1503 Total Sheet Flow Tt (min) 15.52

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

0.2455 Computed Tt (min) 2.0

Total Shallow Concentrated Flow Tt (min)

Woodland

Culvert 15 - Time of Concentration Computation

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

1.29

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 343 156 252 316 3447 602 Wetted Perimeter (ft) 104 53 158 95 439 209 Channel Slope (ft/ft) 0.377 0.1246 0.0719 0.0461 0.0175 0.0213 Flow Length (ft) 146 264 416 304 995 453 Mannings n 0.048 0.048 0.048 0.048 0.04 0.04

0.1 0.2 0.6 0.3 0.9 0.7 2.80

25.9

Area = 148.0 Ac Q1 = 10.32

CN = 55 Q2 = 31.77

Tc = 25.9 min Q5 = 79.88

Q10 = 130.15 Q25 = 214

Culvert 16 - Time of Concentration Computation

0.8 3.7

0.0639 Total Sheet Flow Tt (min) 21.85

Woodland

Computed Tt (min) 1.29 Total Shallow Concentrated Flow Tt (min)

Watershed time of concentration Tc (min) =

0.2517

Computed Tt (min)

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

8.05

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 159 26 Wetted Perimeter (ft) 79 29 Channel Slope (ft/ft) 0.0768 0.0026 Flow Length (ft) 479 193 Mannings n 0.048 0.035

Computed Tt (min) 0.6 1.6 2.17

29.8

Area = 19.7 Ac Q1 = 3.54

CN = 60 Q2 = 7.6

Tc = 29.8 min Q5 = 15.24

Q10 = 22.66 Q25 = 34.31

0.1056 0.2031

Woodland Woodland 5 5

479 424

Culvert 17 - Time of Concentration Computation

0.8 3.7

0.0843 Total Sheet Flow Tt (min) 19.56

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

Computed Tt (min) 4.91 3.14

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

1.78

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 142 160 Wetted Perimeter (ft) 61 80 Channel Slope (ft/ft) 0.1705 0.0608 Flow Length (ft) 644 413 Mannings n 0.048 0.04

Computed Tt (min) 0.4 0.5 0.92

20.9

Area = 14.7 Ac Q1 = 2.34

CN = 58 Q2 = 5.69

Tc = 20.9 min Q5 = 12.3

Q10 = 18.76 Q25 = 29.04

Culvert 18 - Time of Concentration Computation

0.8 3.7

0.1015 Total Sheet Flow Tt (min) 18.16

Woodland

0.1785

Computed Tt (min) 1.78 Total Shallow Concentrated Flow Tt (min)

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

4.43

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 324 813 127 5 Wetted Perimeter (ft) 69 133 70 18 Channel Slope (ft/ft) 0.1987 0.0909 0.0646 0.029 Flow Length (ft) 272 440 310 103 Mannings n 0.048 0.048 0.035 0.035

Computed Tt (min) 0.1 0.2 0.3 0.6 1.26

25.5

Area = 14.3 Ac Q1 = 1.3

CN = 56 Q2 = 3.64

Tc = 25.5 min Q5 = 8.63

Q10 = 13.79 Q25 = 22.19

3.7

0.0812 Total Sheet Flow Tt (min) 19.85

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

0.1413 0.1086 Computed Tt (min) 3.04 1.40

Total Shallow Concentrated Flow Tt (min)

Woodland Woodland 5 5

342 138

Culvert 19 - Time of Concentration Computation

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

4.43

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 324 813 127 5 Wetted Perimeter (ft) 69 133 70 18 Channel Slope (ft/ft) 0.1987 0.0909 0.0646 0.0225 Flow Length (ft) 272 440 310 178 Mannings n 0.048 0.048 0.035 0.035

Computed Tt (min) 0.1 0.2 0.3 1.2 1.82

26.1

Area = 26.2 Ac Q1 = 4.36

CN = 59 Q2 = 9.88

Tc = 26.1 min Q5 = 20.51

Q10 = 30.97 Q25 = 47.45

Culvert 20 - Time of Concentration Computation

0.8 3.7

0.0812 Total Sheet Flow Tt (min) 19.85

Woodland

Computed Tt (min) 3.04 1.40 Total Shallow Concentrated Flow Tt (min)

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

Woodland 5 5

342 138

0.1413 0.1086

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

1.50

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 898 898 3895 3296 Wetted Perimeter (ft) 147 147 377 544 Channel Slope (ft/ft) 0.0511 0.048 0.0299 0.0139 Flow Length (ft) 695 1764 1505 6280 Mannings n 0.048 0.048 0.045 0.035

Computed Tt (min) 0.5 1.4 0.9 6.3 9.10

40.2

Area = 387.0 Ac Q1 = 66.45

CN = 61 Q2 = 134.53

Tc = 40.2 min Q5 = 261.36

Q10 = 383.19 Q25 = 574.65

Total Shallow Concentrated Flow Tt (min)

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

0.0227

Computed Tt (min) 1.50

Total Sheet Flow Tt (min) 29.60

Woodland

Culvert 21 - Time of Concentration Computation

0.8 3.7

0.03

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

CALCULATED BY: BJ PROJECT NAME: PROJECT FW-TENN 12(1)

CHECKED BY: MB

OVERLAND FLOW SEGMENT, SHEET FLOW TYPE

Surface Description Woods: Dense Underbrush Roughneess coeff. n Flow length L (ft) 2 YR 24 HR rainfall depth (in) Land slope (ft/ft)

OVERLAND FLOW SEGMENT, SHALLOW CONCENTRATED FLOW TYPE

Cover type Velocity Factor Flow length (ft) Watercourse Slope (ft/ft)

2.20

CHANNEL FLOW SEGMENT

Flow Area (sq ft) 1.9 Wetted Perimeter (ft) 11.9 Channel Slope (ft/ft) 0.0522 Flow Length (ft) 290 Mannings n 0.04

Computed Tt (min) 1.9 1.90

38.9

Area = 2.5 Ac Q1 = 1.3

CN = 71 Q2 = 2.03

Tc = 38.9 min Q5 = 3.2

Q10 = 4.24 Q25 = 5.78

Total Shallow Concentrated Flow Tt (min)

Total Channel Flow Tt (min)

Watershed time of concentration Tc (min) =

0.0245

Computed Tt (min) 2.20

Total Sheet Flow Tt (min) 34.80

Woodland

Culvert 22 - Time of Concentration Computation

0.8 3.7

0.02

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Circular Diameter 24 in Material Corrugated Aluminum Mannings n 0.031 No. of Barrels 1

Design Discharge (5-YR) 18.88 cfs Inlet Control Depth 3.17 ft Allowable HW EL. 382.44 Outlet Control Depth 1.9 ft Design HW EL. 380.62 TW Depth 0.55 ft HW Depth 3.17 ft Control Type Inlet

HW/D 1.59

Grades

Upstream Invert EL. 377.45 Downstream Invert EL. 373.98 Culvert Length 64 ft Constructed Slope 0.0542 ft/ft

Hydraulic Profile Outlet Depth 1.42 ft

Froude Number 1.17 Normal Depth 1.42 ft Outlet Pipe Velocity 7.91 ft/s Critical Depth 1.56 ft

Culvert 1 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Circular Diameter 36 in Material Corrugated Aluminum Mannings n 0.031 No. of Barrels 1

Design Discharge (2-YR) 31.82 cfs Inlet Control Depth 2.93 ft Allowable HW EL. 392.80 Outlet Control Depth 0 ft Design HW EL. 391.19 TW Depth 1.16 HW Depth 2.93 ft Control Type Inlet

HW/D 0.98

Grades

Upstream Invert EL. 388.26 Downstream Invert EL. 382.73 Culvert Length 68 ft Constructed Slope 0.0813 ft/ft

Hydraulic Profile Outlet Depth 1.32 ft

Froude Number 1.64 Normal Depth 1.32 ft Outlet Pipe Velocity 10.66 ft/s Critical Depth 1.83 ft

Culvert 2 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Circular Diameter 36 in Material Corrugated Aluminum Mannings n 0.031 No. of Barrels 1

Design Discharge (2-YR) 31.77 cfs Inlet Control Depth 2.94 ft Allowable HW EL. 386.97 Outlet Control Depth 0 ft Design HW EL. 385.86 TW Depth 1.22 HW Depth 2.94 ft Control Type Inlet

HW/D 0.98

Grades

US Pipe Invert EL. 382.92 DS Pipe Invert EL. 378.16 Culvert Length 64 ft Constructed Slope 0.0744 ft/ft

Hydraulic Profile Outlet Depth 1.37 ft

Froude Number 1.52 Normal Depth 1.35 ft Outlet Pipe Velocity 10.1 ft/s Critical Depth 1.83 ft

Culvert 3 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Circular Diameter 36 in Material Corrugated Aluminum Mannings n 0.031 No. of Barrels 1

Design Discharge (10-YR) 61.42 cfs Inlet Control Depth 4.86 ft Allowable HW EL. 408.90 Outlet Control Depth 4.18 ft Design HW EL. 405.75 TW Depth 1.02 ft HW Depth 4.86 ft Control Type Inlet

HW/D 1.62

Grades

Upstream Invert EL. 400.89 Downstream Invert EL. 397.76 Culvert Length 58 ft Constructed Slope 0.0540 ft/ft

Hydraulic Profile Outlet Depth 2.32 ft

Froude Number 1.21 Normal Depth 2.32 ft Outlet Pipe Velocity 10.47 ft/s Critical Depth 2.53 ft

Culvert 4 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Arch Span 42 in Material Corrugated Aluminum Rise 29 in No. of Barrels 1 Mannings n 0.031

Design Discharge (10-YR) 30.90 cfs Inlet Control Depth 2.54 ft Allowable HW EL. 387.90 Outlet Control Depth 0.4 ft Design HW EL. 387.1 TW Depth 0.64 ft HW Depth 2.54 ft Control Type Inlet

HW/D 1.05

Grades

Upstream Invert EL. 384.56 Downstream Invert EL. 382.48 Culvert Length 45 ft Constructed Slope 0.0462 ft/ft

Hydraulic Profile Outlet Depth 1.03 ft

Froude Number 1.7 Normal Depth 1.03 ft Outlet Pipe Velocity 9.78 ft/s Critical Depth 1.45 ft

Culvert 5 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Circular Diameter 24 in Material Corrugated Aluminum Mannings n 0.031 No. of Barrels 1

Design Discharge (2-YR) 18.05 cfs Inlet Control Depth 3.02 ft* Allowable HW EL. 394.65 Outlet Control Depth 2.88 ft Design HW EL. 394.39 TW Depth 0.67 ft HW Depth 3.02 ft Control Type Inlet

HW/D 1.51

Grades

Upstream Invert EL. 391.36 Downstream Invert EL. 389.95 Culvert Length 44 ft Constructed Slope 0.0320 ft/ft

Hydraulic Profile Outlet Depth 1.53 ft

Froude Number 1.00 Normal Depth 1.78 ft Outlet Pipe Velocity 7.00 ft/s Critical Depth 1.53 ft

*Inlet control is shown, but flow profile is substantially FF.

Culvert 6 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Arch Span 28 in Material Corrugated Aluminum Rise 20 in No. of Barrels 1 Mannings n 0.031

Design Discharge (10-YR) 14.05 cfs Inlet Control Depth 2.36 ft Allowable HW EL. 415.25 Outlet Control Depth 2.41 ft Design HW EL. 414.71 TW Depth 1.10 ft HW Depth 2.41 ft Control Type Outlet

HW/D 1.45

Grades

Upstream Invert EL. 412.3 Downstream Invert EL. 410.89 Culvert Length 54 ft Constructed Slope 0.0260 ft/ft

Hydraulic Profile Outlet Depth 1.35 ft

Froude Number 0.94 Normal Depth 1.50 ft Outlet Pipe Velocity 6.23 ft/s Critical Depth 1.35 ft

Culvert 7 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Arch Span 28 in Material Corrugated Aluminum Rise 20 in No. of Barrels 1 Mannings n 0.031

Design Discharge (5-YR) 14.09 cfs Inlet Control Depth 2.07 ft Allowable HW EL. 411.53 Outlet Control Depth 0.51 ft Design HW EL. 411.13 TW Depth 0.46 ft HW Depth 2.07 ft Control Type Inlet

HW/D 1.24

Grades

Upstream Invert EL. 409.06 Downstream Invert EL. 407.18 Culvert Length 44 ft Constructed Slope 0.0427 ft/ft

Hydraulic Profile Outlet Depth 0.86 ft

Froude Number 1.49 Normal Depth 0.86 ft Outlet Pipe Velocity 7.86 ft/s Critical Depth 1.10 ft

Culvert 8 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Arch Span 28 in Material Corrugated Aluminum Rise 20 in No. of Barrels 1 Mannings n 0.031

Design Discharge (25-YR) 2.94 cfs Inlet Control Depth 0.7 ft Allowable HW EL. 425.88 Outlet Control Depth 0 ft Design HW EL. 423.93 TW Depth 0.14 ft HW Depth 0.7 ft Control Type Inlet

HW/D 0.42

Grades

Upstream Invert EL. 423.23 Downstream Invert EL. 421.63 Culvert Length 41 ft Constructed Slope 0.0390 ft/ft

Hydraulic Profile Outlet Depth 0.35 ft

Froude Number 1.4 Normal Depth 0.35 ft Outlet Pipe Velocity 4.7 ft/s Critical Depth 0.45 ft

Culvert 9 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Circular Diameter 24 in Material Corrugated Aluminum Mannings n 0.031 No. of Barrels 1

Upstream Invert EL. 369.46 Downstream Invert EL. 368.36 Culvert Length 90 ft Constructed Slope 0.0122 ft/ft

Stand Pipe Summary

Shape Circular Diameter 24 in Material Corrugated Aluminum Mannings n 0.031 No. of Barrels 1

Top Invert EL. 380.46 Bottom Invert EL. 369.46 Pipe Length 11 ft

Replace Culvert 10 and accompanying stand-pipe in-kind.

Culvert 10 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Circular Diameter 24 in Material Corrugated Aluminum Mannings n 0.031 No. of Barrels 1

Design Discharge (5-YR) 15.4 cfs Inlet Control Depth 2.57 ft Allowable HW EL. 385.89 Outlet Control Depth 2.59 ft Design HW EL. 385.8 TW Depth 0.34 ft HW Depth 2.59 ft Control Type Outlet

HW/D 1.30

Grades

Upstream Invert EL. 383.21 Downstream Invert EL. 381.92 Culvert Length 42 ft Constructed Slope 0.0307 ft/ft

Hydraulic Profile Outlet Depth 1.41 ft

Froude Number 0.96 Normal Depth 1.52 ft Outlet Pipe Velocity 6.48 ft/s Critical Depth 1.41 ft

Culvert 11 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Circular Diameter 36 in Material Corrugated Aluminum Mannings n 0.031 No. of Barrels 1

Design Discharge (10-YR) 54.51 cfs Inlet Control Depth 5.06 ft* Allowable HW EL. 369.20 Outlet Control Depth 4.68 ft Design HW EL. 369.02 TW Depth 1.31 ft HW Depth 5.06 ft Control Type Inlet

HW/D 1.69

Grades

US Pipe Invert EL. 363.96 DS Pipe Invert EL. 361.87 Culvert Length 59 ft Constructed Slope 0.0354 ft/ft

Hydraulic Profile Outlet Depth 2.4 ft

Froude Number 1.02 Normal Depth 2.56 ft Outlet Pipe Velocity 9 ft/s Critical Depth 2.4 ft

*Inlet control is shown, but flow profile is substantially FF.

Culvert 12 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Arch Span 28 in Material Corrugated Aluminum Rise 20 in No. of Barrels 1 Mannings n 0.031

Design Discharge (25-YR) 2.6 cfs Inlet Control Depth 0.81 ft Allowable HW EL. 371.78 Outlet Control Depth 0.52 ft Design HW EL. 369.40 TW Depth 0.33 ft HW Depth 0.81 ft Control Type Inlet

HW/D 0.49

Grades

Upstream Invert EL. 368.59 Downstream Invert EL. 366.97 Culvert Length 49 ft Constructed Slope 0.0331 ft/ft

Hydraulic Profile Outlet Depth 0.52 ft

Froude Number 0.96 Normal Depth 0.52 ft Outlet Pipe Velocity 3.96 ft/s Critical Depth 0.56 ft

Culvert 13 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Arch Span 28 in Material Corrugated Aluminum Rise 20 in No. of Barrels 1 Mannings n 0.031

Design Discharge (25-YR) 13.08 cfs Inlet Control Depth 1.95 ft Allowable HW EL. 367.69 Outlet Control Depth 2.06 ft Design HW EL. 366.55 TW Depth 0.21 ft HW Depth 2.06 ft Control Type Outlet

HW/D 1.24

Grades

Upstream Invert EL. 364.49 Downstream Invert EL. 364.07 Culvert Length 46 ft Constructed Slope 0.0091 ft/ft

Hydraulic Profile Outlet Depth 1.06 ft

Froude Number 1.01 Normal Depth 1.67 ft Outlet Pipe Velocity 5.9 ft/s Critical Depth 1.06 ft

Culvert 14 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Arch Span 28 in Material Corrugated Aluminum Rise 20 in No. of Barrels 1 Mannings n 0.031

Design Discharge (25-YR) 9.13 cfs Inlet Control Depth 1.41 ft Allowable HW EL. 387.17 Outlet Control Depth 0 ft Design HW EL. 386.52 TW Depth 0.37 ft HW Depth 1.41 ft Control Type Inlet

HW/D 0.85

Grades

Upstream Invert EL. 385.11 Downstream Invert EL. 381.7 Culvert Length 44 ft Constructed Slope 0.0775 ft/ft

Hydraulic Profile Outlet Depth 0.54 ft

Froude Number 2.05 Normal Depth 0.54 ft Outlet Pipe Velocity 8.57 ft/s Critical Depth 0.86 ft

Culvert 15 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Circular Diameter 36 in Material Corrugated Aluminum Mannings n 0.031 No. of Barrels 1

Design Discharge (2-YR) 31.77 cfs Inlet Control Depth 2.99 ft Allowable HW EL. 369.37 Outlet Control Depth 0.93 ft Design HW EL. 368.46 TW Depth 1.34 ft HW Depth 2.99 ft Control Type Inlet

HW/D 1.00

Grades

Upstream Invert EL. 365.47 Downstream Invert EL. 363.33 Culvert Length 50 ft Constructed Slope 0.0428 ft/ft

Hydraulic Profile Outlet Depth 1.58 ft

Froude Number 1.17 Normal Depth 1.58 ft Outlet Pipe Velocity 8.39 ft/s Critical Depth 1.83 ft

Culvert 16 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Circular Diameter 24 in Material Corrugated Aluminum Mannings n 0.031 No. of Barrels 1

Design Discharge (5-YR) 15.24 cfs Inlet Control Depth 2.56 ft Allowable HW EL. 379.75 Outlet Control Depth 2.69 ft Design HW EL. 379.02 TW Depth 0.55 ft HW Depth 2.69 ft Control Type Outlet

HW/D 1.35

Grades

Upstream Invert EL. 376.33 Downstream Invert EL. 375.64 Culvert Length 42 ft Constructed Slope 0.0164 ft/ft

Hydraulic Profile Outlet Depth 1.41 ft

Froude Number 0.96 Normal Depth 2 ft Outlet Pipe Velocity 6.45 ft/s Critical Depth 1.41 ft

Culvert 17 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Circular Diameter 24 in Material Corrugated Aluminum Mannings n 0.031 No. of Barrels 1

Design Discharge (10-YR) 18.76 cfs Inlet Control Depth 3.15 ft Allowable HW EL. 380.82 Outlet Control Depth 2.22 ft Design HW EL. 380.68 TW Depth 0.31 ft HW Depth 3.15 ft Control Type Inlet

HW/D 1.58

Grades

Upstream Invert EL. 377.53 Downstream Invert EL. 375.09 Culvert Length 47 ft Constructed Slope 0.0519 ft/ft

Hydraulic Profile Outlet Depth 1.44 ft

Froude Number 1.14 Normal Depth 1.44 ft Outlet Pipe Velocity 7.76 ft/s Critical Depth 1.56 ft

Culvert 18 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Arch Span 21 in Material Corrugated Aluminum Rise 15 in No. of Barrels 1 Mannings n 0.031

Design Discharge (5-YR) 8.63 cfs Inlet Control Depth 2.04 ft Allowable HW EL. 376.93 Outlet Control Depth 2.41 ft Design HW EL. 376.89 TW Depth 0.18 ft HW Depth 2.41 ft Control Type Outlet

HW/D 1.93

Grades

Upstream Invert EL. 374.48 Downstream Invert EL. 374.29 Culvert Length 31 ft Constructed Slope 0.0063 ft/ft

Hydraulic Profile Outlet Depth 0.93 ft

Froude Number 1.07 Normal Depth 1.25 ft Outlet Pipe Velocity 5.88 ft/s Critical Depth 0.93 ft

Culvert 19 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Circular Diameter 24 in Material Corrugated Aluminum Mannings n 0.031 No. of Barrels 1

Design Discharge (2-YR) 9.88 cfs Inlet Control Depth 1.75 ft Allowable HW EL. 375.83 Outlet Control Depth 0 ft Design HW EL. 375.46 TW Depth 0.81 ft HW Depth 1.75 ft Control Type Inlet

HW/D 0.88

Grades

US Pipe Invert EL. 373.71 DS Pipe Invert EL. 370.46 Culvert Length 51 ft Constructed Slope 0.0637 ft/ft

Hydraulic Profile Outlet Depth 0.89 ft

Froude Number 1.35 Normal Depth 0.89 ft Outlet Pipe Velocity 7.27 ft/s Critical Depth 1.12 ft

Culvert 20 Report - 100% Design

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Box Span 14 ft Material Concrete Rise 6 ft No. of Barrels 1 Mannings n 0.012

Design Discharge (25-YR) 574.65 cfs Inlet Control Depth 6.32 ft Allowable HW EL. 369.26 Outlet Control Depth 4.51 ft Design HW EL. 369.2 TW Depth 2.6 ft HW Depth 6.32 ft Control Type Inlet

HW/D 1.05

Grades

Upstream Invert EL. 362.88 Downstream Invert EL. 362.54 Culvert Length 20 ft Constructed Slope 0.0170 ft/ft

Hydraulic Profile Outlet Depth 3.03 ft

Froude Number 1.37 Normal Depth 1.93 ft Outlet Pipe Velocity 13.53 ft/s Critical Depth 3.74 ft

Riprap Apron Geometry Calculations

Culvert 21 Report - 100% Design

Box Width Culvert Exit Culv Exit Tailwater Wo D' Velocity (Vo) Depth (Yo) Depth (TW) TW/D' Froude # Type W1 W2 L Box Rise 14 4.52 13.53 3.03 2.60 0.58 1.37 apron 42.0 62.0 30.0 6

Eastern Federal Lands Highway Division

Tennessee National Wildlife Refuge

Culvert Summary

Shape Arch Span 28 in Material Corrugated Aluminum Rise 20 in No. of Barrels 1 Mannings n 0.031

Design Discharge (25-YR) 5.78 cfs Inlet Control Depth 1.09 ft Allowable HW EL. 480.33 Outlet Control Depth 1.18 ft Design HW EL. 478.22 TW Depth 0.25 ft HW Depth 1.18 ft Control Type Outlet

HW/D 0.71

Grades

US Pipe Invert EL. 477.04 DS Pipe Invert EL. 476.88 Culvert Length 31 ft Constructed Slope 0.0052 ft/ft

Hydraulic Profile Outlet Depth 0.66 ft

Froude Number 0.94 Normal Depth 0.97 ft Outlet Pipe Velocity 4.32 ft/s Critical Depth 0.66 ft

Culvert 22 Report - 100% Design

AECOM C-1

Appendix C – Revetment Calculations

AECOM D-1

Appendix D – Correspondence

Jackson, Brandi

From: Anderson, Brian Sent: Wednesday, July 21, 2021 5:07 PM To: Jackson, Brandi Rae; Ogden, Kyle Subject: FW: TENN 12(1)- Notice to proceed for Phase III

From: Kirtley, Yanina (FHWA) <Yanina.Kirtley@dot.gov> Sent: Wednesday, June 30, 2021 5:26 PM To: Anderson, Brian <brian.anderson1@aecom.com> Cc: Hall, Brian (Nashville) <Brian.Hall@aecom.com>; Feleke, Alazar (FHWA) <Alazar.Feleke@dot.gov> Subject: [EXTERNAL] TENN 12(1)- Notice to proceed for Phase III

Good evening Brian, At this point, per previous conversation, I have not received any letter from you requesting clarifications on culvert design, so I am issuing a Notice to Proceed (NTP) for phase III, effective tomorrow, July 1. Your team has 104 days to submit the deliverables, due October 12, 2021.

Please see below guidance from the hydraulic engineer, Wendy Hiciano:

“For the revisions of the culverts that the AECOM is recommending to significantly increase there are few ways we could go about it:

1. Replace in-kind and have a design exception. Having in mind that any culvert less than 24 inches should be increased and still providing recommendations based on the 25-year flood event. For this we just would need documentation stating that the culvert will not accommodate the peak design flow.

2. Low Water Crossings (LWC).

Aecom already has the calculations so this should be easily modified. We would need concurrence from the FWS on which solution works best for them.

The SOW states as follow:

Prepare a Preliminary Hydraulics Report by investigating the existing hydraulic conditions, including the materials, types, sizes, and invert elevations of…