4.2.2. Pumping rate
Jacob (1947) mainly had proposed the relation of pumping rate and the total components of the drawdown of a pumping well by the equations.
Sw= \(\left(BQ+CQ^{2}\right)\) (1)
Where,
Sw= whole drawdown (L; m)
Q= pumping or discharge value (L3/T; m3/day)
B= loss coefficient of aquifer or formation (T/L2; day/m2)
BQ= component drawdown owing to the aquifer or formation loss with the flow of laminar in the aquifer (L; m)
C= coefficient well loss (T2/L5; day2/m5)
CQ2= drawdown component because of well loss or flow of turbulent in the early approach of the well through the gravel pack and/or screen (L; m)
Rorabaugh has modified the Equation (1) and it has been substituted ā€œnā€ as a variable of the exponent of the equation on the turbulent flow that has determined empirically as:
Sw= \(\left(BQ+CQ^{n}\right)\) (2)
The parameter ā€nā€ has assumed between the ranges of values of 1.5 and 3.5, on the basis of Q value. But Kawecki (1995) has supported and it is widely accepted (n=2) by Kresic (2006) that is proposed by Jacob (1947).