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1 yd3 / cu yd = 168.18 gal Imp.
1 gal Imp. = 0.0059 yd3 / cu yd
Definition of cubic yards of water provided by WikiPedia
A cubic yard is an Imperial / U.S. customary (non-SI non-metric) unit of volume, used in the United States, Canada, and the UK. It is defined as the volume of a cube with sides of 1 yard (3 feet, 36 inches, 0.9144 metres) in length.
Definition of U.K. gallon of water provided by TheFreeDictionary
A unit of volume in the British Imperial System, used in liquid and dry measure, equal to 4 quarts (4.546 liters).