Per ASTMAmerican Society of Testing and Materials; technical organization formed for the development of standards on characteristics and performance of materials, products, systems and services, and the promotion of related knowledge. D653, a rock fragment, usually rounded or semirounded, with dimensions between 3 and 12 in. (75 and 305 mm).
Chemical Oxygen Demand; a measure of the need for oxygen by chemical processes.
A scientifically based factor that is taken into account during calculations.
The fractional change in length of a material for a unit change in temperature.
A barrier built in the water so as to form an enclosure from which the water is pumped to permit free access to the area within.