Exercise 7
A monitoring well that is 5.08 cm in diameter was installed in an unconfined silt‑rich formation that is 5 m thick. The base of the well screen is located 2.5 m below the land surface and is 1 m long. The water table is 0.5 m below land surface. A slug out test was performed on this well as illustrated in the image below.
Slug out test conducted in a silt‑rich unconfined formation. a) Unpumped well design and location of screened interval. The slug test was conducted by lowering the water level by 0.6 m. This is the water level at the start of the test (H0). b) After 10.5 minutes (633 s) the water level had recovered within 0.08 m of the static water elevation (modified from Todd and Mays, 2005).
An Excel® data base of the time‑drawdown data is available on the web page for this book↗.
- Select an appropriate method to analyze the slug test data. Explain your choice.
- Use this method to calculate K.