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Radius of Influence in Flow in Wells Formulas

The radius of influence is the distance from a pumping well to the point where the drawdown, or lowering of the water table, becomes negligible. And is denoted by R. Radius of Influence is usually measured using the Meter for Length. Note that the value of Radius of Influence is always positive.

Formulas to find Radius of Influence in Flow in Wells

fxRadius of Influence when Interference among Well is Present​Go
fxRadius of Influence when Interference among Three Well is Present​Go
fxRadius of Influence of unconfined aquifer with known discharge​Go
fxRadius of Influence given Discharge for Partially Penetrating Well​Go
fxRadius of Influence given Ratio of Discharge​Go
fxRadius of Influence given Ratio of Discharge with Base 10​Go
fxRadius of Influence given Discharge by Spherical Flow​Go
fxRadius of Influence given Discharge by Spherical Flow with Base 10​Go

Flow in Wells formulas that make use of Radius of Influence

fxDischarge through Each Well when Interference among Well is Present​Go
fxCoefficient of Permeability when Interference among Well is Present​Go
fxAquifer Thickness when Interference among Well is Present​Go
fxThickness of Aquifer from Impermeable Layer when Interference among Well is Present​Go
fxDepth of Water in Well when Interference among Well is Present​Go
fxRadius of Well when Interference among well is present​Go
fxDistance between well when Interference among well is present​Go
fxDischarge through Each Well when Interference among Three Well is Present​Go
fxCoefficient of Permeability when Interference among Three Well is Present​Go
fxAquifer Thickness when Interference among Three Well is Present​Go
fxThickness of Aquifer from Impermeable Layer when Interference among Three Well is Present​Go
fxDepth of Water in Well when Interference among Three Well is Present​Go
fxRadius of Well when Interference among three well is present​Go
fxDistance between well when Interference among three well is present​Go
fxThickness of Aquifer given Discharge for Fully Penetrating Well​Go
fxDepth of Water in Well given Discharge for Fully Penetrating Well​Go
fxRadius of Well of unconfined Aquifer with known Discharge​Go
fxDischarge for Partially Penetrating Well​Go
fxCoefficient of Permeability given Discharge for Partially Penetrating Well​Go
fxAquifer Thickness given Discharge for Partially Penetrating Well​Go
fxThickness of Aquifer given Discharge for Partially Penetrating Well​Go
fxDepth of Water in Well given Discharge for Partially Penetrating Well​Go
fxRadius of Well given Discharge for Partially Penetrating Well​Go
fxCorrection Factor for Partial Penetration given Discharge for Partially Penetrating Well​Go
fxRatio of Discharge due to Spherical Flow to Discharge due to Radial Flow​Go
fxAquifer Thickness given Ratio of Discharge​Go
fxRatio of Discharge due to Spherical Flow to Discharge due to Radial Flow with Base 10​Go
fxAquifer Thickness given Ratio of Discharge with Base 10​Go
fxDischarge by Spherical Flow​Go
fxDischarge by Radial Flow given Discharge by Spherical Flow​Go
fxAquifer Thickness given Discharge by Spherical Flow​Go
fxDischarge by Spherical Flow with Base 10​Go
fxDischarge by Radial Flow given Discharge by Spherical Flow with Base 10​Go
fxAquifer Thickness given Discharge by Spherical Flow with Base 10​Go

List of variables in Flow in Wells formulas

fx Radius of Well ​Go
fx Distance Between Wells ​Go
fx Coefficient of Permeability ​Go
fx Aquifer Thickness ​Go
fx Initial Piezometric Surface ​Go
fx Depth of Water ​Go
fx Discharge by Each Well when Two Well Interference ​Go
fx Discharge by Each Well at Three Well Interference ​Go
fx Depth of Water in Fully Penetrating Gravity Well ​Go
fx Discharge for Fully Penetrating Gravity Well ​Go
fx Correction Factor ​Go
fx Discharge for Partially Penetrating Well ​Go
fx Ratio of Discharge ​Go
fx Discharge by Spherical Flow ​Go

FAQ

What is the Radius of Influence?
The radius of influence is the distance from a pumping well to the point where the drawdown, or lowering of the water table, becomes negligible. Radius of Influence is usually measured using the Meter for Length. Note that the value of Radius of Influence is always positive.
Can the Radius of Influence be negative?
No, the Radius of Influence, measured in Length cannot be negative.
What unit is used to measure Radius of Influence?
Radius of Influence is usually measured using the Meter[m] for Length. Millimeter[m], Kilometer[m], Decimeter[m] are the few other units in which Radius of Influence can be measured.
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