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CE 515 Railroad Engineering
DrainageSource: AREMA Ch. 5, J. Rose Lectures, Ch. 19
“Transportation exists to conquer space and time -”
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Recommended Procedures
• Existing Drainage Study
• Proposed Drainage System
• Flood Plain Encroachment Evaluation
• Erosion Control Evaluation
J. Rose Lectures, Ch. 16, Slide 4
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Existing Drainage Study• USGS Quadrangle Map or Hydrologic Atlas for area
• Plot existing and proposed ROW
• Identify– floodplain & floodway
– watershed areas
– existing bridges, culverts, & problem areas
– Sheet & concentrated flows
– closed drainage systems
• Select– outlet points for watershed area
– hydrology criteria
• Calculate/run model – assign flow rates
• Add flow rates and hydrographs
• Select proper hydraulic method to determine storm water elevations
• Conduct a plan-in-hand filed reviewhttp://www.lanecounty.org/Planning/Flood_Info/images/Flood_logos/Mapleton_SFHA2.jpg
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Proposed Drainage System
• Complete and review existing drainage study
• Superimpose improvements on existing map
• Locate new drainage features
• Floodplain and wetland impacts?
• Never relocate existing outlet point
• Maintain existing watershed limits
• Calculate new hydrology & hydraulics
• Compare new data with existing data
• Initiate permitting process
http://redac.eng.usm.my/html/projects/Maktab%20Perguruan/image/Melaka1.jpg
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Flood Plain Encroachment Evaluation
• Possible permitting reviews:– FEMA
• Physical Map Change
• Letter of Map Revision
• Conditional Letter of Map Revision
• Elevation Criteria
– US Army Corps of Engineers• Excavation below normal water
elevation
– State Water Resources Dept.• Floodway
– County (possibly)
• Floodplain
• Floodway
• Compensatory Storage
• Elevation Criteria Iowa Department of Transportation, Office of Rail
Cedar Rapids and Iowa City Railway @ US 151 near Amana
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Erosion Control EvaluationErosion Control Device Area Function
Silt Fence Site Perimeter Reduces offsite discharge
Hay Bales Ditches Reduces flow velocities for sediment collection
Aggregate ditch checks Ditches Reduces flow velocities for sediment collection
Settlement Basins Ditches Allows sediment to settle
http://www2.dot.state.oh.us/construction/OCA/Manuals/2006_MOP/Web_Manual/207TemporarySedimentControls_files/image020.jpg
http://www.ci.mil.wi.us/ImageLibrary/Groups/citySWMP/images/Ditch_Check.jpg
http://pro-kote.com/products/images/SiltFence.jpg
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What Happens when Drainage Fails?
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J. Rose Lectures, Ch. 19, Slide 20
J. Rose Lectures, Ch. 19, Slide 20
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J. Rose Lectures, Ch. 19, Slide 21
J. Rose Lectures, Ch. 19, Slide 21
J. Rose Lectures, Ch. 19, Slide 21
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Iowa Department of Transportation
Iowa Department of Transportation
Iowa, Chicago, & Eastern Railroad and Iowa 24 near Ft. Atkinson
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Repairing Drainage Problems
• Subgrade settlement due to poor drainage
PROBLEM:Water below this point won’t drain out
SOLUTION:Install sub-drain system
J. Rose Lectures, Ch. 19, Slide 18
J. Rose Lectures, Ch. 16, Slide 4
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Questions?
http://www.iaisrr.com/node/73
Never underestimate the power of water!
Iowa Interstate Railroad at Cedar River near Moscow, IA