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Question 1

Figure ch03q01.jpg
The saturated hydraulic conductivity K can be determined by placing a soil core sample in a permeameter (see the above figure).
A = surface area of the soil core sample (m²) Δh = h₁ - h₂ (m)
L = length of the soil core sample (m)
Q = discharge (volume flux) of water (m³ day^-1)
All variables have positive values.
Which one of the following alternatives is correct?

Question 2

Figure ch03q02.jpg
The volume flux Q' in m² day^-1 =

a) 0.4

b) 4

c) 40

d) 400

Question 3

Groundwater is pumped from a confined aquifer. The aquifer's intergranular pressure

a) increases and the aquifer's pore water pressure decreases.

b) decreases and the aquifer's pore water pressure increases.

c) increases and the aquifer's pore water pressure increases.

d) decreases and the aquifer's pore water pressure decreases.

Question 4

K = saturated hydraulic conductivity
D = saturated depth of an aquifer
S = storage coefficient
The transmissivity of a homogeneous, confined aquifer equals

Question 5

Which of the following set of equations hold for vertical steady groundwater flow through two horizontal sediment layers (q = vertical volume flux density; d = depth or thickness of a layer; K = saturated hydraulic conductivity; 1 = layer 1; 2 = layer 2)?

Question 6

In a polder the hydraulic head is measured both above and below a semi-permeable layer. The hydraulic head below the semi-permeable layer is one metre higher than the hydraulic head above the semi-permeable layer. The semi-permeable layer has a hydraulic resistance of 2000 days. The upward seepage into the polder in mm day^-1 equals

a) 0.5

b) 1.0

c) 1.5

d) 2.0

Question 7

Figure ch03q07.jpg
The substitute hydraulic conductivity K in m day^-1 =

; the hydraulic gradients i₁: i₂ : i₃ = 2 : 1 : 5

; the hydraulic gradients i₁: i₂ : i₃ = 2 : 1 : 10

; the hydraulic gradients i₁: i₂ : i₃ = 2 : 1 : 5

; the hydraulic gradients i₁: i₂ : i₃ = 2 : 1 : 10

Question 8

Remark 1: There are no confined aquifers in The Netherlands.
Remark 2: There are no local groundwater flow systems in The Netherlands.

a) Remark 1 is right; remark 2 is wrong.

b) Remark 1 is wrong; remark 2 is right.

c) Remark 1 is right; remark 2 is right.

d) Remark 1 is wrong; remark 2 is wrong.

Question 9

A flat soil at field capacity receives 5 cm of rain, which causes the water table to rise 20 cm; water loss by evaporation is negligible. The storage coefficient equals

a) 1/4

b) 4

c) 15

d) 100

Question 10

Figure ch03q10.jpg
The volume flux Q' (m² day^-1) of groundwater in this flow net (top view) with equipotentials h and streamlines S for an element with width W and length L equals

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