The Step-Drawdown Test and Non-Darcian Flow: A Critical Review of Theory, Methods and Practice | Zendy

Henrik Kærgaard | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

The Step-Drawdown Test and Non-Darcian Flow: A Critical Review of Theory, Methods and Practice

Author(s) -

Henrik Kærgaard

Publication year - 1982

Publication title -

hydrology research

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.665

H-Index - 48

eISSN - 1996-9694

pISSN - 0029-1277

DOI - 10.2166/nh.1982.0020

Subject(s) - drawdown (hydrology) , duration (music) , mathematics , flow (mathematics) , yield (engineering) , calculus (dental) , statistics , geology , thermodynamics , physics , geotechnical engineering , geometry , medicine , aquifer , groundwater , dentistry , acoustics

Step-drawdown tests are usually carried out with succeeding steps of increased pumping yield, each step of equal duration of 1 hour. The background for this procedure is reviewed, and it is shown, that very often much shorter duration of steps is adequate. The analysis of step-tests is usually based on the formulas of Jacob or Rorabaugh. The physical background for these formulas is reviewed, and the latter is shown to be unsatisfactory. However, the formula is used in cases where the data do not fit the Jacob formula, some typical deviations are shown. Reasons for these problems, trivial and non-trivial, are discussed, and some reasonably sound pshysical explanations for the various systematic deviations from the Jacob formula are given.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research