Courtesy of THB Maintenance Sdn Bhd In tropical regions with rainfall stands as the crucial factors to starting the landslide mechanism, a proper surface drainage is important to avert any unwanted incidents. I only focusing on the surface runoff and the role of cascading drain to channel the runoff safely to designated discharged point. A rainfall on a steep slopes will run as surface runoff with lower probability for the water to infiltrate into the soil. This necessitate the introduction of cascading drain to collect the water from the berm or slope drain. The design of cascading drain is basically allowing the hydraulic jump, an abrupt changes from supercritical to subcritical flow that will reduce the water flow rate and act as an energy dissipater. The effectiveness of hydraulic jump depends on the input of the rainfall volumes and flow rate in which failure to do so will resulted to flood and nuisance to the public. ...
A typical Malaysian engineer with his side of story