The problem of define flow ...

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The problem of define flow direction is very easy when you have a data on local topography

In many cases when there is a flat topography it's can be tricky

You can use the elevation profile from google earth to find the general elevation profile along your canal , the other option is to use the data from DEM. There is a good DEM from the Japan Aerospace Exploration Agency (JAXA)

https://www.eorc.jaxa.jp/ALOS/en/aw3d30/index.htm

please note that both data set are based on 30m grids **

  

Good luck

Lior .