I believe that the formula to get the volume of a regular prism is V = L × W × H. And so with that being said, Let's just say the pond is rectangular in shape, therefore we can use that formula.
Width = Volume/(Length x Depth)
Plug in your variables.
Width = 7.35/4.2 × 0.5 = 7.35/2.1 = 3.5 m
So, your width of the pond is equal to 3.5m.
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