A completely saturated aquifer with an upper and/or lower aquitard boundary.

• perched aquifer

• aquitard

• semi-confined aquifers

• potentiometric surface (piezometric surface)

An imaginary surface whose height above a confined aquifer is determined by the pressure within the aquifer. The water in a well drilled into a confined, or semi-confined aquifer will rise to the level of the potentiometric water will flow out of the well (artesian well). Thw potentiometric surface of an unconfined aquifer is the water table. The slope of the potentiometric surface is the hydraulic gradient under which ground water moves.

• perched aquifer

• aquitard

• semi-confined aquifers

• potentiometric surface (piezometric surface)

A geologic formation or layer, made up of pervious materials, that transmits or yield water in appreciable quantities.

• aquifer

• unconfined aquifer

• aquiclude

• confined aquifer

An aquifer in which the upper water boundary (water table) is at atmospheric pressure.

• aquifer

• unconfined aquifer

• aquiclude

• confined aquifer

An impermeable layer of materials (clay or bedrock).

• aquifer

• unconfined aquifer

• aquiclude

• confined aquifer

A saturated aquifer between 2 aquiludes in which the pressure is greater than atmospheric pressure.

• aquifer

• unconfined aquifer

• aquiclude

• confined aquifer

Ground water shall be:

• rain water infiltrating in the ground and moving beyond the reach of vegetation and either collecting in underground basins or flowing laterally in subsurface streams as well as porous aquifers do constitutes ground water source.

• water as it seeps down comes into contact with organic and inorganic substances during its passage through the ground and acquires chemical characteristics representative of the strata passed through.

• ground waters are clear and colorless but are harder that the surface water of the region in which they occur.

• all of these

Surface water shall be:

• on the other hand, deep lakes are subject to overturning, which tends to bring up sediments as well as oxygen starved water in the surface.

• the microscopic organisms may be heavy in such waters on occasions. if the catchment is protected and unerodable, the stored water may not require any treatment other than disinfection.

• impounding reservoirs formed by hydraulic structures thrown across river valleys are subject more or less to the same conditions as natural lakes and ponds.

• all of these

One of the advantages of rainwater harvesting shall be:

• water is soft and pure and is suitable for the hot water supply system

• only a source during the wet season

• storage becomes a breeding place for mosquitoes

• roofs may not be clean

The advantages of ground water shall be:

• usually has an abundant supply

• requires less treatment because of natural filtering

• both A and B

• none of these