Transcription of CHAPTER 4 SLOPE DRAINAGE - JICA
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CHAPTER 4 SLOPE DRAINAGE - JICA
The Study on Disaster Risk Management for Narayangharh-Mugling Highway Technical Guide JICA 4 - 1 February 2009 CHAPTER 4 SLOPE DRAINAGE General Landslides and SLOPE failures originate mostly from surface water and spring erosion. Proper DRAINAGE of surface and subsurface water is one of the most important aspects of maintaining stable road slopes. According to the field visit along the N-M highway, the implemented SLOPE DRAINAGE included horizontal drain hole works, roadside ditches and culvert boxes. The main problems relating to surface DRAINAGE and subsurface DRAINAGE are summarized as follows: (1) Surface DRAINAGE a) No any surface DRAINAGE facilities were constructed on the hill SLOPE of the road, except for roadside ditches along the hillside of the road and culvert boxes cross the road.
4.3.2 Top Slope Drainage Ditch Drainage ditches for the top of the slope shall be installed along the top of the slope to prevent flow of surface runoff from adjacent areas onto the slope. The size of the ditch along the top of the slope shall be determined according …
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