How to size a culvert?
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Sizing a culvert involves several factors such as the culvert’s hydraulic requirements, design discharge, and soil conditions. Generally, the culvert size should be large enough to convey the design discharge without causing excessive flooding or erosion.
The determination of culvert size is based on Manning’s equation which takes into consideration the shape, length, gradient, and roughness of the culvert. Additionally, local regulations may also need to be taken into consideration when sizing a culvert.