is between 7 and 9 mg/L; most fish cannot survive when the DO level falls below 3 mg/L. Discharge capacity. The maximum amount of water that can safely released from a given waterway. Direct shear test. A shear test in which soil or rock under an applied normal load is stressed to failure by moving one section of the specimen container relative to the other section. Direct runoff. Water that flows over the ground surface or through the ground directly into streams, rivers, or lakes. Dip. The angle that a stratum or any planar feature makes with the horizontal, measured perpendicular to the strike and in the vertical plane. The slope of layers of soil or rock. Dilution. Reduction of the concentration of a substance in air or water. Diaphragm wall. A sheet, thin zone, or facing made of a relatively impervious material such as concrete, steel, wood, plastic, etc. Also see core wall. Dew point. The temperature to which air with a given quantity of water vapor must be cooled to cause condensation of the vapor in the air. Detection. The first of five Early Warning System components consisting of the processes and
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