# What is a phreatic water?

## What is a phreatic water?

A term that originally was applied only to water that occurs in the upper part of the zone of saturation under water-table conditions (syn. of unconfined ground water, or well water), but has come to be applied to all water in the zone of saturation, thus making it an exact syn.

What is the meaning of phreatic aquifer?

The term phreatic (the word originates from the Greek phrear, phreat- meaning “well” or “spring”) is used in hydrology and the earth sciences to refer to matters relating to ground water (an aquifer) below the water table. This surface normally coincides with the water table.

How do you calculate ground water flow?

The equation for calculating ground water velocity is: V= KI/n. In this formula V stands for “groundwater velocity,” K equals the “horizontal hydraulic conductivity,” I is the “horizontal hydraulic gradient,” and n is the “effective porosity.”

### What does phreatic mean?

1 : of, relating to, or being groundwater. 2 : of, relating to, or being an explosion caused by steam derived from groundwater.

What most likely caused the water to rise and erupt from the vent?

The correct answer is – The water was heated by magma or hot rocks. The hot water that is erupting from the vents comes from the geologic activity inside the Earth.

Vadose water is subsurface water between the land surface and the saturated zone below the water table.

#### What is phreatic level?

The phreatic zone, or zone of saturation, is the part of an aquifer, below the water table, in which relatively all pores and fractures are saturated with water. Above the water table is the vadose zone. The phreatic zone size, color, and depth may fluctuate with changes of season, and during wet and dry periods.

Can groundwater flow uphill?

As already noted, groundwater does not flow in straight lines. It flows from areas of higher hydraulic head to areas of lower hydraulic head, and this means that it can flow “uphill” in many situations. This is illustrated in Figure 14.8.

How fast does groundwater flow?

A velocity of 1 foot per day or greater is a high rate of movement for ground water, and ground-water velocities can be as low as 1 foot per year or 1 foot per decade. In contrast, velocities of streamflow generally are measured in feet per second. A velocity of 1 foot per second equals about 16 miles per day.

## Is Taal Volcano phreatic eruption?

This activity prompted the raising of Taal’s status to Alert Level 3 on Thursday due to its “high level of volcanic unrest.” He explained that in January last year, Taal began a phreatic eruption, driven mainly by steam emissions.

Which layer will become saturated first when rain falls?

Clay-rich soils have the largest pore spaces thus experience the highest total water holding capacities. In this image, saturation will first occur in the soil layer when it rains.

What would a person drilling a well most likely reach immediately?

the water table would a person drilling a well most likely reach immediately after drilling through the unsaturated zone. This answer has been confirmed as correct and helpful.