ASBOG HYDROGEOLOGY QUESTIONS
AND ANSWERS WITH SOLUTIONS 2024
Area of Influence - ANSWER The area within the potentiometic surface is lowered by withdrawal or
raised by injection, of water through well.
Aquifer - ANSWER A geologic unit that is saturated and sufficiently permeable to transmit significant
economic quantities of water to wells and springs
Capillary Fringe - ANSWER The lowest part of the zone of aeration, immediately above the water table,
where water is under pressure that is less than atmospheric pressure
Cone of Depression - ANSWER A depression in the potentiometric surface of ground water that has the
shape of an inverted cone and develops around a well from which water is being withdrawn. it defines
the area of influence in a well
confined aquifer - ANSWER an aquifer overlain by a confining layer of low permeability.
connate water - ANSWER water trapped in the pores of a sedimentary rock at the time of deposition;
fossil water
darcy - ANSWER unit of intrinsic permeability
darcys law - ANSWER Q=KiA
Discharge area - ANSWER an area where subsurface water is discharged to land. bodies of water, or the
atmosphere
drawdown - ANSWER the amount of the water level in a well is lowered due to withdrawal of water
effective porosity - ANSWER the percentage of the total volume of a soil or rock that consists of
interconnected pore space. the term is sometimes used analogously to specific yield
AND ANSWERS WITH SOLUTIONS 2024
Area of Influence - ANSWER The area within the potentiometic surface is lowered by withdrawal or
raised by injection, of water through well.
Aquifer - ANSWER A geologic unit that is saturated and sufficiently permeable to transmit significant
economic quantities of water to wells and springs
Capillary Fringe - ANSWER The lowest part of the zone of aeration, immediately above the water table,
where water is under pressure that is less than atmospheric pressure
Cone of Depression - ANSWER A depression in the potentiometric surface of ground water that has the
shape of an inverted cone and develops around a well from which water is being withdrawn. it defines
the area of influence in a well
confined aquifer - ANSWER an aquifer overlain by a confining layer of low permeability.
connate water - ANSWER water trapped in the pores of a sedimentary rock at the time of deposition;
fossil water
darcy - ANSWER unit of intrinsic permeability
darcys law - ANSWER Q=KiA
Discharge area - ANSWER an area where subsurface water is discharged to land. bodies of water, or the
atmosphere
drawdown - ANSWER the amount of the water level in a well is lowered due to withdrawal of water
effective porosity - ANSWER the percentage of the total volume of a soil or rock that consists of
interconnected pore space. the term is sometimes used analogously to specific yield
