8.3 Well Theory

The well theory is aimed at the relationship between the discharge quantity and the drawdown.The relationship is affected by a number of factors：the numbers of wells，their structures，the geological conditions，and pumping time.The relationship between the discharge quantity and drawdown can be either solved by mathematical well formulas or numerical groundwater modeling.The formers are inferred by assuming ideal conditions，whereas the latter is applicable to any geological or pumping condition and is therefore widely adopted.There are a great number of well formulas and it is impossible to introduce all of them here.Only the most widely used well formulas are to be discussed here for reference and application.