ABSTRACT
Others (Rorabaugh, 1953; Bruin and Hudson, 1955) examined the problem and determined that a more exact representation for the turbulent loss term is CQl, where n is some number which must be determined for each well. However, Bruin and Hudson (1955) concluded that Equation 5.3 is sufficient for most practical situations. The ratio of laminar to total head losses, Lp (%),is defined as
BQ 1;, = (BQ + CQ2) • 100% (5.4)
In a step discharge pumping test, pumping rates are increased in a series of "steps" (see below). Because Cooper and Jacob's (1946) equation is only valid when u = r2S/(4Tt) is small (u < 0.03) the pumping rate for each step is held constant long enough to insure that drawdown data for that step plot as a straight line on a semilogarithmic graph. As the pumping rate and duration of pumping increase, the radius of the cone of depression increases in size and may intersect aquifer boundaries, which may be erroneously interpreted as a reduction in specific capacity of the pumping well due to turbulent head loss.
