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1 yd3 / cu yd = 201.97 gal
1 gal = 0.005 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 US gallon of water provided by WikiPedia
the US gallon is defined as 231 cubic inches (3.785 l), which is used in the US and some Latin American and Caribbean countries