Clearing debris in an irrigation channel - GIF

Clearing debris in an irrigation channel.

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Previously:

Irrigation big gun sprinkler - GIF
Irrigation ditch digging dog - GIF
Irrigation flow control noodle - GIF
Simple irrigation siphon - GIF
Tractor-mounted irrigation pump - GIF
Two bucket irrigation yoke - GIF
Excavator digging a water channel - GIF
Excavator laying drainage channel covers - GIF
Flash flood raging down control channel - GIF

Hi: What is making the pile of leaves move??

If you look where the leaves are coming from, it looks like the leaves thin out and it is only water.

Here is my guess: Concrete canal = good safe place to burn leaves. Someone starts a leaf fire. Someone else opens the irrigation valve sending a wall of water down the canal. Water pushes a block of leaves, including the fire, towards the camera.

Doesn't look like the ditch is being cleaned out.

And it looks like the fire can easily spill over to catch dead vegetation alight either side of the channel.