The formulation is length × average width × depth of the river pour.
The formulation must take place in millimetres.
For example, 1200mm (length) × 271mm (width) × 50mm (depth) = 16260000.
This number is then divided by 1 million.
For example, 16260000 ÷ 1000000 = 16.260 litres needed.
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