Civil Engineering Technical Project for an existing T intersection needing to be updated. Plans submitted to NCDOT, City of Asheville, and to Wilbur Smith Engineering company over the Wilma Dykeman Riverway Project in Asheville North Carolina. This was submitted by the Senior Project Class Spring 2011

1. Wilma Dykeman Riverway Transportation Project Project team: M. Dooly J. Ensley S. Escobar D. Kestner J. Lovelace L. Roselli T. Wyatt

3. Amboy Rd

4. Meadows Rd

5. Lyman Rd

6. Roadway Connection at or near the Proposed Roundabout for direct access to Asheville-Buncombe Technical Community College.

9. Flood Data

10. 100 yr.

12. ASHEVILLE-BUNCOMBE TECHNICAL COMM. COL.LYMAN ROAD ACCESS “UP YONDER WAY”

13. Bridge Design Dillon Kestner

14. Design Methodology Evaluation of current intersection of Amboy/Meadows Roads Evaluation of existing bridge over French Broad River

15. Existing Bridge and intersection

16. Design Methodology Evaluation of current intersection of Amboy/Meadows Roads Existing intersection causes excessive traffic queuing and delays onto the Bridge/Amboy Road as well as traffic coming from Biltmore Ave onto Meadows Road Evaluation of existing bridge over French Broad River In need of remediation if not removal Poor pedestrian facilitation Bottleneck to proposed 4-lanes of Amboy Road in the feasibility study

17. Existing bridge does not have a walkway but pedestrians daringly still try to use the 2 foot wide curb.

18. The Riverway Project demands a more pedestrian/bicycle friendly bridge and intersection in this area to link the rest of the parks and walkways along the river. The traffic volume projections for 2025 (24000 vehicles per day versus the current 16000 vehicles per day from 2004 estimates) indicate that a 4-lane rather than 2-lane bridge would accommodate this flow of traffic as well as be a more cohesive design with the proposed 4 lanes of Amboy Road. A 4-lane bridge over the French Broad calls for a new intersection.

19. What should a new bridge feature? It should provide better traffic flow to and from Amboy Road. It should have pedestrian traffic facilities. Its design should be cohesive with the proposed Amboy Road alignment. It should have few negative impacts on the surrounding park areas or the French Broad River. It should be aesthetically pleasing and reflect the spirit of the River Arts District.

21. Construction of New Bridge only

22. Construction of New Intersection only

23. Construction of New Bridge with Roundabout Intersection

24. Do NothingFocus on alternative to construct a new bridge and roundabout intersection

26. Safer than signalized intersection

27. Low delay times

29. Basic Cross Section of Bridge Lane width at 11 ft for continuity with proposed Amboy Road alignment 2 lanes each direction 18 inch curb and gutter outside travel way 60 inch side walk outside travel way Aluminum parapet railing along sidewalk for traffic/pedestrian safety

30. Aluminum parapet Weight savings advantage over steel/concrete No need to treat for weather corrosion Higher than steel initial cost but much lower maintenance cost

31. Roundabout and 2D New Bridge Drawings over GIS Image

32. New Bridge Alignment with Roundabout

33. Image Drawn in 3D showing ground surface

34. Image Drawn in 3D showing ground surface

35. Image Drawn in 3D showing ground surface

36. Conceptual Rendering

37. Alternatives to Consider 5 foot median between sides of bridge can be mulched and flowered for beautification purposes, or parapet divided. Sidewalks can be tied into facilities on Amboy and Meadows Roads and to the park not shown in Rendering. Bridge section could be widened to better accommodate cyclists that do not use sidewalks.

38. Alternatives to Consider Steel members and Piers analyzed for current span lengths but larger members can be considered to increase span lengths and reduce any negative impacts on the French Broad River.

39. Next Phase Planning Evaluation of concrete reinforcement Pier installation feasibility in river Bolted/welded connection analysis Impacts on local wildlife and park areas

40. An Introduction and Overview of Modern Roundabouts Presented By: Truman Wyatt

41. General Terminology Comparison of Traffic Circles Applications and Examples General Information Topics

42. Many misperceptions Not simply a circular intersection Roundabouts Include: Yielding at entry Low speeds due to the curve Designed precisely based on peaked traffic volumes What is a Modern Roundabout

44. Slowing Down/Calming Effect Very Safe Low Maintenance Cost Easily Modified Eliminates Red lights Good Traffic Operations/Few Delays RoundaboutsPros

45. Concepts almost identical to traffic signals Pavement Markings will guide you SELECT YOUR LANE BEFORE THE YIELD LANE YIELD TO TRAFFIC WITHIN CIRCLE LEFT TURNS ARE MADE FROM THE LEFT (inside) APPROACH LANE How to Drive a Roundabout

49. Lyman Rd. 2, 12ft lanes w/ 5 ft bike lane Truck Lane Circle Amboy Rd. Meadow Rd.

50. Pedestrian Bridges

51. Proposed Pedestrian Bridge Location

52. Types of Pedestrian Bridges

53. Types of Pedestrian Bridges

54. Types of Pedestrian Bridges

55. Proposed Pedestrian Bridge

56. Jonathan Lovelace Proposed AB Tech Bridge/Roadway

57. Preliminary Data AB Tech Growth Annual student growth of 8.2% Annual Faculty growth of 21.8% ADT 17, 500 (2010) 75,000 (2025) 20% added for business traffic

58. Proposed Road Design Turning Bay 2010 – 175 ft. 2025 – 500 ft. Calculated by 25 ft bumper to bumper distance 2000 ft allowable Specifications Four lanes Currently two lanes are needed Non divided Double Yellow, no turning lanes 1176 ft. traffic circle to proposed Lyman Rd. intersection 3500 ft. Lyman Rd. to AB Tech intersection (Behind Maple)

59. Proposed Road Design Cont. Next phase planning Cut and fill Switchbacks Currently placed to grade radius to small for 4 lane road Tie in point at intersection of AB Tech campus 4 lane to 2 lane Currently road between 3% and 7% grade Topo survey needed to obtain proper grade Landscape buffering between road and residential properties

60. Proposed Bridge to A-B Technical C.C.

61. Proposed AB Tech Bridge Design Specifications 240 Ft Bridge span Minimum height 26 ft. With in specifications for railroad crossing Allowed for two tracks on either side of previous tracks Next phase planning Currently 9% grade from bridge to Lyman Rd intersection Approximately 20 ft of fill needed to obtain reasonable grade Bridge Piers Bridge Gerters

62. Proposed Bridge location to A-B Tech C.C.

63. Proposed Bridge to A-B Tech C.C. Over Rail Road Yard

64. Preliminary Soil StudyFrom the United States Department of Agriculture Jared Ensley

65. Amboy Bridge

67. Requires certain depth

68. Assumptions made, need to be reviewed at next stage

71. Speed of construction

73. Reusable soil would need to be stored off site temporarily http://www.sr85-123.com/gallery_past.php http://www.berlinvt.org/1057-01%20Report.pdf

76. More expensive than MSE abutmenthttp://northwest.construction.com/northwest_construction_news/2010/1001_DBMCompletes.asp http://www.berlinvt.org/1057-01%20Report.pdf

77. Bridge to AB-Tech

79. Good base

80. Assumptions made

82. Bridge Design Objectives Provide for the safe traveling of the public across a waterway. Allowing for transportation of storm discharges through the structure without impacting the traveling public, damage to properties or the environment.

83. Real-Time Water Data for French Broad Watershed

84. Asheville Flood, 2004

88. FRENCH BROAD RIVER AT ASHEVILLE, NC Daily stream flow Avg.; (Min)(Max) 2,420(ft3/s) 3,050(ft3/s)

89. PeakRunoff (existing)

90. PeakRunoff (proposed)

93. Hydraulic Consideration for Bridge design Scour Bank Piers Backwater elevation change

95. Rip Rap (Piers and Bank)

96. A-Jacks (Piers only)

97. Further detail in the next phase

98. Placement

99. Size

101. Design for Scour Prevention Round piers were chosen Round piers allow a smoother transition of flow around pier Creates less backwater elevation

102. Bridge Requirements Any other structures located within the Downstream and Upstream survey limits should be surveyed like the project structure Any sharp bends, head cut, or significant changes in the stream channel or floodplain within the survey limits should also be surveyed. Channels that are flatter than 0.0004 ft/ft requires an additional cross section at 4000 ft. downstream of the Bridge.

103. Allowable Backwater • In general, the bridge should be designed to clear the design frequency flood • Meet NFIP (National Flood Insurance Program) requirements • Limited to 1-foot raise in 100-year backwater • Backwater should not be allowed to flood “Unreasonably large areas of usable land” • Backwater should not be increased in urban areas

104. BRIDGE DESIGN CRITERIA: Bridge was design to pass the 100 year storm with 2 feet of freeboard. There should be no impact to the upstream water surface elevation or floodway. BRIDGES OVER WATERWAYS

105. Preliminary estimates: New Vehicular Bridge Construction Over French Broad: $5,068,000 Removal of Existing Bridge: $483,000 New Pedestrian Bridge: $1,350,000 Roundabout Construction: $1,750,000 Total Construction Cost of $8,651,000