CE 515 Railroad Engineering

DrainageSource: AREMA Ch. 5, J. Rose Lectures, Ch. 19

“Transportation exists to conquer space and time -”

Recommended Procedures

• Existing Drainage Study

• Proposed Drainage System

• Flood Plain Encroachment Evaluation

• Erosion Control Evaluation

J. Rose Lectures, Ch. 16, Slide 4

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

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

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

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

What Happens when Drainage Fails?

J. Rose Lectures, Ch. 19, Slide 20

J. Rose Lectures, Ch. 19, Slide 20

J. Rose Lectures, Ch. 19, Slide 21

J. Rose Lectures, Ch. 19, Slide 21

J. Rose Lectures, Ch. 19, Slide 21

Iowa Department of Transportation

Iowa Department of Transportation

Iowa, Chicago, & Eastern Railroad and Iowa 24 near Ft. Atkinson

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

Questions?

http://www.iaisrr.com/node/73

Never underestimate the power of water!

Iowa Interstate Railroad at Cedar River near Moscow, IA