Lab and Field Methods and Tests

Question 1

What is a auger hole?

Answer 1

A borehole which has no solid Casing below the water level.

Question 2

What are the advantages of auger hole and piezometers tests?

Answer 2

cheap
quick
yield information relating to small scales

Question 3

What are the disadvantages of auger hole and piezometer tests?

Answer 3

less control than a lab
less good theoretical basis than pumping tests
measurers properties mainly of the borehole damaged zone
yields information relating to small scales

Question 4

What are the assumptions of the theory of auger tests?

Answer 4

Darcy’s Law is valid
There is no drawdown around the borehole
homogeneous system
the shape factor approach is valid ( S is not dependent on K)

Question 5

What is the shape factor?

Answer 5

The shape factor accounts for geometrical factors. It is the cross sectional area through which the flow is going divided by the distance over which the head is dissipated

Question 6

What is a packer test?

Answer 6

Packer tests are pumping tests performed on isolated sections of boreholes to determine the vertical hydraulic conductivity. Works best on un-screened boreholes.

Question 7

What is a slug test?

Answer 7

A displacement test carried out in a full-scale borehole to obtain K (or T)