Question

When designing a culvert, you calculate the required diameter under both inlet and outlet control conditions. Which of the diameters do you select? Explain

Answer 1

In design of culvert the standardized manner by which culverts are examined and designed is :-

1:- The design approach involves first computing the headwater elevation upstream of the culvert assuming that inlet control governs.

2:- The headwater elevation upstream is then also found assuming that outlet control governs.

3:- Now the two headwater values are compared with one another and the higher of the two is selected. so culvert can be either design for the inlet diameter or for the oultlet diameter based on the results from step 1 & 2 and their comparison.

So if you deigned the culvert under both inlet and outlet control conditions then you have to choose the one in which there is higher head on the upstream of the culvert.

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