IT IS NECESSARY TO COLLECT SUFFICIENT DATA FROM THE CATCHMENT AREA AND RAINFALL, CONVEYANCE FACTOR AND SLOPE OF THE STREAM, AS EXPERIENCE HAS SHOWN THAT SOME TIMES SERIOUS MISTAKES ARE MADE THAT LEADS TO WASTE THROUGH UNSAFE AND UNECONOMICAL DESIGNS.

Road project detailed project reports are prepared for the five years plan of the required time for completion of the work to be executed by the department concerned or the agency, as the case may be, however sometimes based on insufficient data and this causes delay in completion as well as use ans exercise of the schemes for execution. While the speed in execution of the plan and proposal is essential, at the same time the quality of work is also required to be maintained as per the Detailed Project Report technically sanctioned by the Engineering department of the Agency. As for as the design of a culvert or a small bridge is concerned it is not a small thing /matter to be despised by the Engineers. It must be remembered that the number of culverts and the small bridges in any road project is so large that, together, they account for a considerable portion of the total expenditure. As for as experience related to the design &Scope of such culverts and the small bridges is concerned it is revealed that sometimes serious mistakes are made in these simple matters and that leads to waste through unsafe, uneconomical as well as the ignored facts of methods for calculating the flood discharge from the catchment area and rainfall, from the conveyance factor and slope of the river and required for the flood marks on existing structure outlined with the suggestion made for fixing the design discharge of the stream.