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A 1-tonne barrel of toxic elements falls accidentally from a trailer crossing a 1 km long wide river and on its centreline. The average flow

 A 1-tonne barrel of toxic elements falls accidentally from a trailer crossing a 1 km long wide river and on its centreline. The average flow speed is 0.12 m/s and the depth of water is 4.6m calculate contaminant concentration 500 m downstream of the injection point.

a) on the central line 1 h after the accident.

(b) on the centreline, 1 h 20 min after the accident.

Assume V* = 0.0062.

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