Area of filter through which seepage is passing, drainage area, radius of a circular group of wells; area of

permeability test sample, area of entrance section of pipe in measuring flow through a venturi meter

or with a Pitot tube, or area of stream of water at end of pipe in jet-flow measurement

Cross-section area of sand drain

-Equivalent radius of a group of wells

Area of orifice

Spacing of wells or wellpoints

Distance between two lines of wells, length of weir crest, or circumference of a vertical pipe in fountain

flow calculations

Width of drainage slot, or end dimension of a rectangular drainage slot

Half width of rectangular array of wells

Half length of rectangular array of wells

Coefficient for friction loss in pipes; coefficient for empirical relation of D10 versus k; coefficient for

empirical relation of k versus R; calibrated coefficient of discharge in measuring flow through a ven-

turi meter or orifice; coefficient for measuring flow with a Pitot tube; or center of a circular group of

wells

Coefficients for gravity flow to two slots from two-line sources

Weighted creep ratio for piping

Factors for drawdown in the vicinity of a gravity well

Coefficient of runoff

Thickness of homogeneous isotropic aquifer, or inside diameter of a discharge pipe

Thickness of equivalent homogeneous isotropic aquifer

Effective grain size

Thickness of a pervious stratum, or pressure tap diameter

Pipe diameter

Orifice diameter

Transformed thickness of homogeneous, isotropic pervious stratum

Electrical potential difference or voltage

Extra-length factor

Effective area factor

Factor for computing drawdown at any point due to a group of wells with circular source of seepage, or

freeboard

Factor for computing drawdown at any point due to a group of wells with line source of seepage

Factor for computing drawdown midway between end wells of a line of wells with a circular source of

seepage

Factor for computing drawdown midway between end wells of a line of wells with a line source of seep-

age

Factor of safety

Factor for computing drawdown at center of a group of wells with circular source of seepage

Factor for computing drawdown at center of a group of wells with line source of seepage

Factor for computing drawdown at a well m in a two-line well array with a circular source of seepage

Factor for computing drawdown at a well in a group of wells with circular source of seepage

Factor for computing drawdown at a well in a group of wells with line source of seepage

Correction factor for a partially penetrating well from Kozeny's formula or Muskat's formula

Groundwater table or level

Acceleration of gravity, 32.2 feet per second squared

Height of water table (initial) or piezometric surface, or crest height in fountain flow measurement;

gravity head

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