Lakes and rivers
Rocks & minerals
Constant temperature year round
Rarely contains dissolved constituents
Rarely contains suspended sediment
Supply is independent of short droughts
The channel is above the local water table year round
The local water table is above the channel bottom year round
The channel bottom and the water table are constantly at the exact same level
Precipitation is such that the water table remains constant throughout the year
A boundary between unsaturated bedrock and an underground river
A boundary between unsaturated bedrock below and saturated bedrock above
An underground mass of partly saturated rock
A boundary between saturated rock below and unsaturated rock above
High porosity and high permeability
Low permeability and high potability
High potability and high portability
Low porosity and low permeability
A horizontal aquitard above the regional water table lies below an aquifer
An aquifer above the regional water table is overlain by a horizontal aquitard
An aquifer below the regional water table is underlain by a horizontal aquitard
An aquitard below the regional water table lies above a horizontal aquifer D) a
The water is warm, fairly saline, and recharged by an affluent stream
Pressurized groundwater rises from a deep, unsaturated aquifer
Water rises above the top of the aquifer without any pumping
The well is horizontal and the water table is perched
The water table in the recharge area is at a higher elevation than the top of the aquifer in the subsurface.
Upward flow from a permeable aquitard is prevented by a confining aquifer.
The pressure at any point in the aquifer is considerably less than the weight of the water column between the point and the top of the aquifer.
In deep, stream-cut valleys, many springs are fed from artesian aquifers.
The water table to drop or decline in elevation
An influent stream to become an effluent stream
Expansion of the dewatered aquifer
Porosity in the aquifer to increase as the water is removed
Unconsolidated medium-grained sand; sand grains are coated with clay minerals
Sandstone; well-cemented with a few, widely spaced vertical fractures
Lakebeds; unconsolidated very fine-grained sand and silt
Limestone; numerous solution channels and fractures widened by dissolution
The caves formed and later the water table rose.
A nearby, downcutting stream lowered the water table after the caves had formed.
Streams formerly flowing on the surface were diverted into the groundwater system through sinkholes.
The main water table is perched above the cavern roofs, allowing air to enter.
Gasoline and kerosene would float on the watertable; ethyl alcohol would dissolve and disperse in the groundwater.
Gasoline and kerosene would float on the water table, but most pesticides break down chemically when they reach the water table.
Sulfuric and nitric acids would sink to the bottom of the aquifer; kerosene would accumulate as a layer just below the water table.
All of the above hazardous substances would dissolve into the groundwater.
Streams flowing into depressions and continuing underground
Perched water table springs on hillsides
Numerous artesian wells in a given area
Perennial, influent streams fed by large springs
The cave roof was below the water table when the speleothems formed.
The cave floor was above the water table and the roof was below the water table when the speleothems formed.
The cave roof was above the water table when the speleothems formed.
The cave roof was below the water table sometime after the speleothems had formed.
Water for livestock and poultry
Domestic and municipal supplies
Agriculture and irrigation
The drawdown is the diameter of the cone of depression measured at the elevation of the original water table.
The drawdown is the percentage of available water in the aquifer that has already been used.
Drawdown is the distance between the original water table and the water level in the well.
There is no relationship between drawdown and the cone of depression.
Wells drilled below sea level will produce only saline water.
The water table must be 40 feet above sea level to keep the salty water in the aquifer below sea level.
Any salty water in the aquifer will rise if the water table is lowered by pumping.
Pumping freshwater from one, large capacity well is much less likely to cause salty water to rise in the aquifer than pumping from several, widely spaced, smaller capacity wells.
Lies above the water table
Pore spaces are filled with water
Is a well-oxygenated, shallow aquifer
Lies below the capillary fringe zone
The porous and permeable, saturated cone of depression in an aquitard
A layer or stratum in which groundwater flows downward to the water table
A saturated, porous, and permeable layer or stratum
An unsaturated, influent-flow bed or stratum below a spring