Sustainability of ditches and gutters :
The size of the ditch should be calculated according to hydraulics estimation, but engineer should also determine what is the best ditch for his road, sometimes it is not easy to find the best one, and to have data and information about the site is primordial in the decision.
Some examples for rural roads
Some examples for urban roads
Some examples of problems (when there is no roadside ditch or overflow)
Roadside ditches may provide a hazard
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