Question

Unconsolidated geological formations usually exhibit

• A. Low yield
• B. Low porosity
• C. High transmissivity
• D. Zero storage

Hint:

Unconsolidated formations (sand and gravel): \[ \boxed{ \begin{aligned} &\text{High porosity}\\ &\text{High permeability}\\ &\text{High transmissivity} \end{aligned} } \]

Answer 1

The Correct Option is C

Step 1: Recall the pore structure of loose materials.
Unconsolidated sand and gravel formations have large, well connected pore spaces since the grains are not cemented together.
Step 2: Link this structure to permeability.
Large connected pores let groundwater pass through with little resistance, giving these formations high permeability.
Step 3: Bring in transmissivity.
Transmissivity is essentially permeability multiplied by aquifer thickness, so a highly permeable unconsolidated formation naturally shows high transmissivity rather than low yield, low porosity, or zero storage.
\[ \boxed{\text{High transmissivity}} \]