How to calculate the bottom width of pipe Culvert

In this video show the slope of HPC Headwall and how to get the bottom of headwall.
In some cases we have increased the excavation to actual level then our Headwall width increase to slope of design.
Pipe Culvert estimate part 1👇👇👇👇link
https://youtu.be/9wAvLN2uIWQ

Pipe Culvert estimate part 2👇👇👇👇link
https://youtu.be/EDavJbaKS1s

Spacing of 2 pipe in pipe Culvert 👇👇👇👇link
https://youtu.be/iavEh8HRAwE

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Видео How to calculate the bottom width of pipe Culvert канала Nayak Engineers