1. CE 515 Railroad Engineering Drainage Source: AREMA Ch. 5, J. Rose Lectures, Ch. 19 “Transportation exists to conquer space and time -”

2. Recommended Procedures Existing Drainage Study Proposed Drainage System Flood Plain Encroachment Evaluation Erosion Control Evaluation J. Rose Lectures, Ch. 16, Slide 4

3. 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 review http://www.lanecounty.org/Planning/Flood_Info/images/Flood_logos/Mapleton_SFHA2.jpg

4. 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%20Per guruan/image/Melaka1.jpg

5. 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

6. Erosion Control Evaluation Erosion Control DeviceAreaFunction Silt FenceSite PerimeterReduces offsite discharge Hay BalesDitchesReduces flow velocities for sediment collection Aggregate ditch checksDitchesReduces flow velocities for sediment collection Settlement BasinsDitchesAllows sediment to settle http://www2.dot.state.oh.us/construction/OCA/M anuals/2006_MOP/Web_Manual/207TemporarySe dimentControls_files/image020.jpg http://www.ci.mil.wi.us/ImageLibrary/Groups/ci tySWMP/images/Ditch_Check.jpg http://pro-kote.com/products/images/SiltFence.jpg

7. What Happens when Drainage Fails?

8. J. Rose Lectures, Ch. 19, Slide 20

9. J. Rose Lectures, Ch. 19, Slide 21

10. Iowa Department of Transportation Iowa, Chicago, & Eastern Railroad and Iowa 24 near Ft. Atkinson

11. 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

12. Questions? http://www.iaisrr.com/node/73 Never underestimate the power of water! Iowa Interstate Railroad at Cedar River near Moscow, IA