WorksheetsHydrogeology quiz
Total questions: 15
Worksheet time: 11mins
Which of the following does not constitute an aquifer boundary?
water table
aquiclude
saturated zone
freshwater/seawater interface
Which of the following aspects affect the rate of aquifer recharge (select all the correct answers)?
water temperature
rainfall intensity
soil permeability
air temperature
What statement about the hydraulic conductivity of an aquifer is correct?
It can be high, even if porosity is very low
It can be low, even if porosity is very high
It is the same as transmissivity
It is lower in sandstones than in sands
What statement about the hydraulic head is correct?
It is higher in confined than in unconfined aquifers
It cannot be measured in the field
It determines the direction of groundwater flow
In unconfined aquifers it is the topographic elevation of the water table
What information is required to calculate the recharge rate based on the water table fluctuation method?
permeability
total porosity
specific yield
rainfall rate
The sustainable yield of an aquifer is always lower than or equal to its safe yield.
True
False
The groundwater flow velocity through a confined aquifer does not depend on the:
permeability
effective porosity
thickness
slope of the water table
What statement is correct about a perched aquifer?
It is often used for public water supply
It is never used for public water supply
It typically occurs in unconfined aquifers
It typically occurs in confined aquifers
The most important characteristic of a productive aquifer is:
its high hydraulic gradient
its high recharge
its high transmissivity
its large thickness
The main characteristic of an anisotropic aquifer is:
different permeability in different directions
typically low permeability
different permeability at different locations
typically high permeability
The maximum abstraction rate for an aquifer considering the environmental constraints is called the
(a)
Hydrograph separation is useful for groundwater studies, because (indicate the incorrect answer!):
it can provide information on groundwater recharge from rainfall
it can provide information on groundwater recharge from a river
it can provide information on groundwater discharge to a river
it can provide information on the aquifer characteristics of the catchment
The seasonal change in storage of a "renewable" aquifer:
equals 0 under natural conditions
is positive
is positive or negative under natural conditions
is only negative when affected by pumping practices
What is true about an unconfined aquifer (indicate the two correct answers)?
It changes in thickness over space.
It changes in thickness over time.
It is built up of unconsolidated materials.
It is less appropriate for development than a confined aquifer.
Indicate the correct order of groundwater resources surveying steps.
remote sensing
geophysics
drilling
well installation
pumping test
remote sensing
drilling
geophysics
well installation
pumping test
geophysics
remote sensing
drilling
well installation
pumping test
geophysics
drilling
pumping test
well installation
remote sensing
