Torque due to static fluid- Transport Phenomena

[Gabriella]

1. Homework Statement
Calculate the torque on the dam about the origin (Picture attached) due to the pressure force of the fluid.

Homework Equations

Pressure force is correct (dF)

The Attempt at a Solution

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I have solve it; however, I am not sure if I calculated over the origin asked. Please help.

 

[Gabriella]

 

[billy_joule]

You are more likely to get help if you post pictures rather than expecting helpers to download files.
Also, include relevant equations and your attempt - typed - not images of messy handwriting.

 

[Gabriella]

Homework Statement

Calculate the torque on the dam about the origin (Picture attached) due to the pressure force of the fluid.