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CVEN3501 Water Resources Engineering - 2025 T1

CVEN3501 Water Resources Engineering - 2025 T1

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Given the following RFFE output, what is the 10% AEP flow estimate?

RFFE output file

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A water table aquifer has a hydrostatic pressure distribution over depth and with a hydraulic head ( h ) at the water table of 10 m. At two meters below the water table what is the value of the:

a) hydraulic head (h)?

b) elevation head (z)? and

c) pressure head (ψ)?

a) 2 m, b) 8 m, c) 10 m

a) 10 m, b) 8 m, c) 2 m

a) 8 m, b) 10 m, c) 2 m

a) 10 m, b) 2 m, c) 8 m

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What is the actual vapour pressure if the relative humidity is 60% and the temperature is 20 degrees Celsius?

Important: give your answer in pascals.

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If I compute the evaporation using a Class A pan (shown below), will I overestimate the evaporation from the surrounding area?

Image of a Class A evaporation pan in situ.

No

Yes

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For a given system, how large does the representative elementary volume (REV) need to be:

Large enough that it represents average solid media properties.

larger than the biggest grain.

Large enough to include both grains and pores

The same size as the control volume

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If the grid spacing of a finite difference 2D groundwater model with a regular grid (Δy = Δx) is halved how wound that affect the truncation error:

It would increase the truncation error by a factor of four.

It would halve the truncation error.

No effect as the truncation error is not real.

It would reduce the truncation error by a factor of four.

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Which are the three mechanisms that can explain the reduction of volume for a porous media (aquifer material)?

1. compression of the water in the pores, 2. compression of the individual mineral grains, 3. Rearrangement of the mineral grains into a more closely packed configuration.

1. compression of the water in the pores, 2. a reduction of the specific storage, 3. Rearrangement of the mineral grains into a more closely packed configuration.

1. compression of the water in the pores, 2. compression of the individual mineral grains, 3. deposition of fine clay particles.

1. a reduction of the porosity, 2. compression of the individual mineral grains, 3. Rearrangement of the mineral grains into a more closely packed configuration.

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For a sandstone aquifer with a compressibility α = 7·10^-9 m²/N and a porosity of φ = 20%, and using other parameter values from the course notes, calculate the specific storage (S_s).

4.80·10^-10 m^-1

2.00·10^-1 m^-1

7.05·10^-9 m^-1

6.96·10^-5 m^-1

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What are isohyets?

Lines joining equal elevations

Lines joining equal rainfal depths.

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What are the principal differences between a steady-state and non-steady-state groundwater model?

There is no flow and no storage in a steady-state model.

a non-steady-state model is unsustainable.

a non-steady-state model will have hydraulic heads varying with time and water entering or leaving storage.

the representative elementary volume (REV) is larger for a non-steady-state model.

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