How to calculate invert level of drain | height of instrument method | invert levels

How to calculate invert level of drain | height of instrument method | invert levels

Friends, in this video I have given information about:
Drain invert level
how to calculate invert levels
Reduced level calculation
height of instrument method surveying
Invert level of drain

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Civil engineer - Sukhwinder Singh 👷‍♂️
civil field engineer