FINALS

Question 1

The property of soil that permits the passage of water under a gradient of force

Answer 1

Permeability

Question 2

The ability of an aquifer to transmit water through its entire thickness.

Answer 2

Transmissivity or Transmissibility

Question 3

a body of saturated rock through which water can easily move. ___ must be both permeable and porous.

Answer 3

Aquifer

Question 4

infiltration downward and lateral movement of water into soil or substrata from a source of supply such as
a reservoir or irrigation canal

Answer 4

Seepage

Question 5

describes the ease with which water can move through the
pore space or fractures network.

Answer 5

Hydraulic Conductivity/Coefficient of Permeability

Question 6

i

Answer 6

hydraulic gradient

Question 7

L

Answer 7

length of flow over which the loss of head occurred

Question 8

Δh

Answer 8

head loss from A to B

Question 9

i = Δh/L

Answer 9

Hydraulic Gradient Formula

Question 10

He published a simple equation for the discharge velocity of water through saturated soils.

Answer 10

Henri Darcy

Question 11

it governs the movement of fluid in the given substance. According to this law, the discharge velocity v bears a linear relationship to the
hydraulic gradient i.

Answer 11

Darcy’s Law

Question 12

v=ki

Answer 12

Darcy’s Law

Question 13

discharge velocity

Answer 13

v

Question 14

hydraulic conductivity

Answer 14

k

Question 15

hydraulic gradient

Answer 15

i

Question 16

The discharge velocity is based on the ____________ of the soil.

Answer 16

gross cross-sectional area

Question 17

It is given by:
νs = ν/n

Answer 17

actual velocity or seepage velocity or
interstitial velocity through the void spaces

Question 18

1. Soil Particle
2. Specific Surface Area of Soil Particles
3. Shape of the Soil Particle
4. Void Ratio
5. Soil Structure
6. Degree of Saturation
7. Water Properties
8. Temperature
9. Adsorbed Water
10. Organic Matter

Answer 18

Factors Affecting Permeability

Question 19

If the soil is coarse-grained, its permeability is higher, and if it is fine-grained, it is low.

Answer 19

Factors Affecting Permeability - Soil Particle

Question 20

The higher it is, the lower the permeability.

Answer 20

Factors Affecting Permeability - Specific Surface Area of Soil Particles

Question 21

Soil with rounded particles has more permeability than those with angular shapes.

Answer 21

Factors Affecting Permeability - Shape of the Soil Particle

Question 22

Generally, permeability increases with _______, but not applicable to all types of soils.

Answer 22

Factors Affecting Permeability - Void Ratio

Question 23

Permeability is greater for flocculated structures and less for dispersed structures. The permeability of stratified
soils also varies according to the direction of soil flow. Permeability is greater in parallel than in perpendicular flow.

Answer 23

Factors Affecting Permeability - Soil Structure

Question 24

Fully saturated soils are more permeable than partially saturated soil.

Answer 24

Factors Affecting Permeability - Degree of Saturation

Question 25

Properties such as unit weight and viscosity also affect permeability.

Answer 25

Factors Affecting Permeability - Water Properties

Question 26

The greater it is, the greater the permeability.

Answer 26

Factors Affecting Permeability - Temperature

Question 27

__________ is the water layer formed around the soil particles, especially in fine-grained soils, thus reducing the void spaces and the permeability.

Answer 27

Factors Affecting Permeability - Absorbed Water

Question 28

The presence of _______ decreases the permeability due to the blockage of voids.

Answer 28

Factors Affecting Permeability - Organic Matter

Question 29

What is the HORIZONTAL FLOW FORMULA

Answer 29

ref. to module

Question 30

What is the VERTICAL FLOW FORMULA

Answer 30

ref. to module