California State University, Sacramento
Geology 500- M.S. thesis project
Week 7: Step tests, well efficiency
We will use three hour step tests to examine the appropriate pumping rate for the confined aquifer
We will also a 25 hour aquifer test to estimate well efficiency.
Driscoll, F. G., 1986, Groundwater and wells, 2nd ed., pp. 555- 559
Well efficiency:, 2nd ed., pp. 244-245, 554- 555 and 630 - 670.
Driscoll, F. G., 1986, Groundwater and wells
Fetter, C. W., Applied Hydrogeology, 4th ed., pp. 205-207
24 hour aquifer test: use for well efficiency calculation (contains EX-1 data)
Step test: Plot to show change in drawdown with time, evaluate qualitatively. Watch for the % change in drawdown with each step.
Distances between wells were measured with a steel tape:
Extraction well to MW1A = 133.0 ft
Extraction well to MW2A = 138.9 ft
Extraction well to MW3A = 30.05 ft
Plot the results of the step test, and discuss whether the aquifer is capable of supplying water at a rate of 150 gpm for an extended period of time.
Estimate the well efficiency by projecting drawdown and the cone of depression from nearby wells.
Include methods sections with appropriate references, results and discussion. Use thesis format.