LESSON 7 Flashcards
It results predominantly from precipitation that has reached the zone of saturation in the Earth through infiltration and percolation. Has the lowest priority on the water from precipitation, hence, its utilization should be limited. Sources of recharge and surface waters
Groundwater
the pores of soil contain both water and air in varying amounts; the water in the upper layers of this zone is called soil moisture
Zone of Aeration
the pores of the soil or rock are filled with water; the water in this zone is called groundwater
Zone of saturation
Can be used interchangeably with influence stream; separator of zone of aeration and zone of saturation
Water table
A geologic formation which contains water and transmits it at rate sufficient to be economically developed for pumping
Aquifer
It is the opposite of Aquifer ; rate insufficient to be economically developed for pumping
Aquiclude
TYPES OF AQUIFER
Unconfined/Water table aquifer
Confined or artesian aquifer
Semi-confined or leaky aquifer
Perched Aquifer
has a water table serving as the upper surface of the zone of saturation
Unconfined/Water table aquifer
one where the groundwater is confined by a relatively impermeable layer
Confined or artesian aquifer
the upper confining layer is leaky or semi-permeable
Semi-confined or leaky aquifer
its lower limit is relatively impermeable layer while its upper surface is a free water surface on water table
Perched Aquifer
AQUIFER PROPERTIES
Porosity
Specific yield
Specific retention
Aquifer conductivity or permeability
Transmissibility
Storage coefficient
capacity of a formation to contain water
Porosity
Water that can be extracted y gravity flow; measure of the volume of water yield per unit soil volume
Specific yield
water retained by the soil formation against the force of gravity
Specific retention
