Those green grass you see are plants that grew by the riverbed, they were either uprooted in very large quantity by the river current at various locations and carried by the flowing river. Due to some possible barricade under the bridge, the grasses could not flow across and thus causing the very large pile of the grass.
Due the pressure by the flowing water and the inability of the grass to cross the obstacle under the bridge, the large pile of grass was so tick that people could even walk over it with the water flowing under it.
With time, if the blockage under the bridge was not forcefully pushed by the weight of the accumulated grass or removed by someone, the grass will decay and gradually flow away and the water will become visible again.
So this explains why you have water flowing on one side of the bridge and the other a very pile of grass.
Hope you now understand the mystery behind the dried up water.
Source: Personal experience from similar incidents around canals.
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