Cone of DepressionIn hydrologic terms, the depression, roughly conical in shape, produced in a water table, or other piezometric surface, by the extraction of water from a well at a given rate. The volume of the cone will vary with the rate of withdrawal of water. Also called the Cone of Influence. Critical DepthIn hydrologic terms, The depth of water flowing in an open channel or conduit, partially filled, corresponding to one of the recognized critical velocities.DEPDepartureDepletion CurveIn hydrologic terms, the part of the hydrograph extending from the point of termination of the Recession Curve to the subsequent rise or alternation of
inflow due to additional water becomming available for stream flow.DepressionA region of low atmospheric pressure that is usually accompanied by low clouds and precipitation. The term is also sometimes used as a reference to a Tropical Depression.Depression StorageIn hydrologic terms, the volume of water contained in natural depressions in the land surface, such as puddles.Depth of RunoffIn hydrologic terms, the total runoff from a drainage basin, divided by its area. For convenience in comparing runoff with precipitation, the term is
usually expressed in inches of depth during a given period of time over the drainage area or acre-feet per square mile. Dew Point DepressionThe difference in degrees between the air temperature and the dew point.Mean DepthIn hydrologic terms, the average depth of water in a stream channel or conduit. It is equal to the cross-sectional area divided by the surface width.Mixing DepthVertical distance between the ground and the altitude to which pollutants are mixed by turbulence caused by convective currents or vertical shear in the horizontal wind.Snow DepthThe combined total depth of both the old and new snow on the ground.Subtropical DepressionA subtropical cyclone in which the maximum 1-minute sustained surface wind is 33 knots (38 mph) or less. Tropical DepressionA tropical cyclone in which the maximum 1-minute sustained surface wind is 33 knots (38 mph) or less.
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