By Robert E Porges
Written through practising hydrogeologists, this inclusive instruction manual presents a concise, easy-to-use reference for hydrologic phrases, equations, pertinent actual parameters, and acronyms. this beneficial reference is meant for pro hydrogeologists, hydrologists, and environmental scientists, in addition to these learning to develop into pros within the revered box. necessities are a easy wisdom of geology and hydrogeology, yet serves as a beneficial source to undergraduate and graduate scholars to boot.
Content:
entrance topic
• Preface
• desk of Contents
Definitions
Acronyms
Equations
Appendices
• References
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Additional resources for Compendium of Hydrogeology
Example text
This is not true if drawdown is large relative to the original saturated thickness of the aquifer. This correction can be applied to the Theis method and Cooper-Jacob method for analyzing pump test data from an unconfined aquifer. S’ where: = s - (s2/2b) (2-26) s‘ = corrected drawdown (L) s = observed drawdown (L) b = original saturated thickness of the aquifer (L) The Theis and Cooper-Jacob analysis are applied in the exact same manner as the unconfined methods, but corrected drawdown is plotted versus time.
204 246 Standard mean ocean water (SMOW) This equation compares the concentration of either isotopes of hydrogen or isotopes of oxygen to a standard ratio, typically that of standard mean ocean water (SMOW). where: 6 O/OO = relative difference between the ratio in the sample and the ratio in the standard = isotope ratios 2W’H or ‘80/160 of the sample Rstandard = isotope ratios 2W’H or 180/160 of the standard R Source: Freeze and Cherry (1979). p. 137; Drever (1988),p. 368 Straight-line recession (semilogarithmicplot) This equation is used to describe the exponential decrease in the base flow recession portion of a hydrograph on a semilogarithmic plot.
The method, which is based on the Thiem equation, can be used to produce a value for K under steady-state conditions. In order to implement this method, observed head (h,) is plotted against the corresponding time (t) on semilogarithmic paper, with h, on the logarithmic y-axis. A straight line is then fit to the data. Two points along the line are selected at random and the corresponding h and t values are selected, yielding values of h, and t. At this point, a value for (l/t) ln(h@,) can be calculated for later use in the equation for K.