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CVEN3501 Water Resources Engineering - 2025 T1

CVEN3501 Water Resources Engineering - 2025 T1

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3e) Calculate Flow through boundary BC [2marks]

Note: You answer should be in [m³/d]

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1. Calculate the flow though the aquifer for Model 1 without any abstraction.

Hint: Check that the flow calculated by the spreadsheet is correct using Darcy’s Law [2 marks].

Note: You answer should be in [m³/d]

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2. Calculate the flow though the aquifer for Model 2 without any abstraction.

Hint: Check that the flow calculated by the spreadsheet is correct using Darcy’s Law [2 marks].

Note: You answer should be in [m³/d]

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For freshwater at 25 °C what is the value of the kinematic viscosity?

0.8904·10-3 [kg·m-1·s-1]

4.57·10-10 [N·s·m-1 ·10-3]

0.8878 [kg2·m-4·s-1 ]

8.930 ·10-7 [m2 ·s-1]

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What is an equipotential line?

A flow path in a vertical cross-section.

A line that connects points of equal potential

A contour that defines the ground surface topography.

Groundwater potentials along the equator.

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What is a flow net?

It is devise used to capture groundwater discharge.

It is a two-dimensional combination of equipotential lines and orthogonal flow lines used to describe groundwater flow in either an x-y plane (horizontal) or an x-z plane (vertical).

It describes the change in flow between two points divided by the distance between the two points.

It is a devise that is used to determine the subsurface flow velocity in a vertical cross-section beneath a dam.

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How much fresh groundwater is believed to exist on Earth?:

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Define the intrinsic permeability (k):

the intrinsic permeability is a function of the media as well as the fluid properties.

the intrinsic permeability is the proportionality constant between the flow and the hydraulic conductivity.

the intrinsic permeability is a function of the porosity, the degree of interconnectivity of pores, the grain size and sorting and the viscosity and density of the fluid.

the intrinsic permeability is a function of the solid media properties only

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The total water potential is the sum of several component potentials. Which two are generally considered important for saturated groundwater.

The matric potential and the gravity potential

The velocity potential and the pressure potential

The gravity potential and the pressure potential

The velocity potential and the matric potential

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Define secondary porosity

It is the inverse of the compressibility for fractured rocks.

It is void space due solution or fracturing of a consolidated rock mass.

The void space of a soil or rock matrix.

It is the void space in sand and gravel.

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