Abstract Estimating oil spill size is important for a variety of economic, environmental and legal reasons. One attempt to determine oil spill size by visually assessing the extent of colour regimes in the spill and multiplying the areas of these regimes by thickness values leads to unsatisfactory results. Previous efforts to estimate oil spill size by inverting spreading using formulae like those of Blokker and Fay have also incurred difficulties related to environmental conditions which influence spill spread rate. Data obtained during a series of field experiments, conducted off the Saudi Arabian coastline during the fall of 1982, were used to devise a modification of Fay's spreading formula. The results agree significantly better with the observed areas of the oil spill than Fay's original formula. The modified area formula is then inverted to obtain a formula for initial volume spilled.
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