Why do you think hydraulic conductivity values differs on soil types?

Why do you think hydraulic conductivity values differs on soil types?

It depends on the soil pore geometry as well as the fluid viscosity and density. The hydraulic conductivity for a given soil becomes lower when the fluid is more viscous than water. Pore geometry and continuity within a soil or landscape vary depending on the direction of measurement.

What does a low hydraulic conductivity mean?

DEFINITIONS OF HYDRAULIC CONDUCTIVITY In theoretical terms, hydraulic conductivity is a measure of how easily water can pass through soil or rock: high values indicate permeable material through which water can pass easily; low values indicate that the material is less permeable.

Can hydraulic conductivity change?

The viscosity of water varies with temperature, so hydraulic conductivity will also vary with temperature. However, in most cases the range of temperature variations in geotechnical problems is small enough that any resulting changes in hydraulic conductivity can reasonably be neglected.

Why is hydraulic conductivity important?

Hydraulic conductivity is probably the most important hydrogeological parameter, as it governs, along with other parameters, the flow of fluids and migration of contaminants beneath the ground surface, especially in soils and aquifers.

What are the main differences between unconfined and confined aquifers when they are pumped?

Unconfined aquifers can produce more water for a smaller change in head compared to confined aquifers (Figure 8). Water released from storage in a confined aquifer is from compression of the aquifer and expansion of the water when pumped.

What is the importance of pumping test in hydraulic system?

In layered systems, one also uses pumping tests to estimate the properties of aquitards(vertical hydraulic conductivityand specific storage). Pumping tests can identify and locate recharge and no-flow boundariesthat may limit the lateral extent of aquifers as well.

What is derivative analysis used for in hydraulic testing?

Diagnostic toolssuch as derivative analysisare useful for identifying flow regimes and aquifer boundaries from a pumping test prior to performing curve matching. Prior to performing a pumping test in the field, one should spend time in the office developing a thorough plan for the test.

Does the pumping rate change during a pumping test?

Although a constant pumping rateis most often the goal, the rate may vary during a pumping test. Software such as AQTESOLVcan account for variable pumping rates; however, results will depend on how closely the recorded flow rates correspond to actual rate changes. Rate Measurement

How are water levels measured during a pumping test?

During a pumping test, water levels in wells may be measured by means of manual techniques or through the use of sensors with data loggers. Manual water-level measurement techniques include chalked steel tape, electric water-level sounders and air line methods.