A completely penetrating well is pumped at a constant rate of 500 gpm Drawdowns

Question

A completely penetrating well is pumped at a constant rate of 500 gpm Drawdowns during the pumping period are measured in an observation well, 175 feet away from the pumped well, at times varying from 2 minutes to 6 hours (shown on next page) The aquifer is completely confined and is 50 feet thick. Use the Theis graphical method to determine aquifer characteristics T (ft2/day), S and K (ft/day) What type of soil material does the aquifer material seem to be, (i.e., clay, silt, gravel, etc.). Also solve this problem by the Cooper-Jacob Straight Line method and compare your results. Show all work.

Explanation / Answer

simultaneous data from a series of wells (distance drawdown) or a series of measurements from one well (time drawdown) are used to plot a semi-log drawdown curve from which the values needed to solve the equations are taken (straight line methods) or Time-drawdown data is plotted on a log-log plot and then matched to a type curve or series of type curves to derive the unknown parameters. (type curve method)

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.