CWD Geology & Groundwater Hydrology 3

Question 1

What does the specific yield of an unconfined aquifer represent?

Accepted Answer

The volume of water released per unit drop in hydraulic head per unit area

Answer

Specific yield is the volume of water that drains by gravity from a unit volume of aquifer material per unit decline in the water table.

Question 2

A perched water table occurs when:

Accepted Answer

Groundwater accumulates above a localized impermeable layer above the regional water table

Answer

A perched aquifer forms when a lens of low-permeability material intercepts downward-percolating water, creating a localized saturated zone above the main water table.

Question 3

Which geologic process is responsible for creating the primary porosity in sandstone aquifers?

Accepted Answer

Depositional pore spaces between grains

Answer

Primary porosity in sandstone results from the spaces between sand grains that were preserved during original sediment deposition and cementation.

Question 4

The vadose zone is best defined as:

Accepted Answer

The unsaturated zone between the land surface and the water table

Answer

The vadose zone (unsaturated zone) extends from the land surface to the water table and contains both air and water in pore spaces.

Question 5

What is transmissivity in hydrogeology?

Accepted Answer

The product of hydraulic conductivity and saturated aquifer thickness

Answer

Transmissivity (T = K × b) describes the ability of an aquifer to transmit water horizontally and depends on both the material's conductivity and the saturated thickness.

(CWD) Certified Well Driller Practice Test

(CWD) Certified Well Driller Practice Test

CWD Geology & Groundwater Hydrology 3