Transcription of CHAPTER 10 DRAINAGE - nra.co.za
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CHAPTER 10 DRAINAGE - nra.co.za
CHAPTER DRAINAGE system manages both surface and subsurface water coming off the road surface and from the surrounding countryside. The purpose of the system is to ensure that the road and its surrounds are free from standing water at all times and to have sufficient capacity to prevent the road from being overtopped. The principal elements of the system are:Crossfall on the road and shoulders to permit free flow off the road . Main problems are slacks, ruts, flat or obstructed shoulders, or shoulders with edge build drains, parallel to the road , which collect run-off from both the road and countryside. Main problems are standing water often caused by silting up, lack of capacity and and culverts which permit crossflow of water under the road and provide outlets for the side drains.
1 1 1 1 1 1 Asphalt berms on the road edge particularly on fills. Main problems are damaged or broken b erms which result in concentrated water flow from the road …
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