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Double-mass curve
A plot on arithmetic cross-section paper of the cumulated values of one variable against the cumulated values of another or against the computed values of the same variable for a concurrent period of time.
Downburst
A severe localized downdraft from a thunderstorm.
Drainage area
The drainage area of a stream at a specified location is that area, measured in a horizontal plane, which is enclosed by a drainage divide.
Drainage basin
A part of the surface of the earth that is occupied by a drainage system, which consists of a surface stream or a body of impounded surface water together with all tributary surface streams and bodies of impounded surface water.
Drainage density
Length of all channels above those of a specified stream order per unit of drainage area.
Drainage divide
The rim of a drainage basin. (See Watershed)
Drainage wells
Wells drilled to carry excess water off agricultural fields. Because they act as a funnel from the surface to the groundwater below, drainage wells can contribute to groundwater pollution.
Drawdown
The difference between the water level in a well before pumping starts (static level) and the water level in a well during pumping, usually measured in feet or meters. Drawdown can be measured in the pumping well itself and in other nearby wells (observation wells). Also, for flowing wells, the reduction of the pressure head as a result of the discharge of water. See also, interference.
Drizzle
Small, slowly falling water droplets, with diameters between .2 and .5 millimeters.
Drought
Drought is a deficiency of moisture that results in adverse impacts on people, animals, or vegetation over a sizeable area. A regional water shortage caused by a prolonged period of below-average precipitation, above-average temperatures, or a combination of the two.

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