what is the cone of depression course hero

Full Answer

What is a cone of depression and how does it work?

Cone of depression can prove to be useful when dealing with contamination of groundwater. A well can be developed near the contaminated area, and then, pumped at a sufficient rate to create a cone of depression. It then, captures the contaminated flow which can be treated to dispose off the contaminants and render clean water.

What is the area above the cone of depression called?

The area above the cone of depression is called the ‘area of influence’. Faster the pumping and drawing out of the water, larger will be the cone of depression. The size and shape of the ‘cone’ depends on various factors such as size of the cone, material and thickness of the aquifer, and amount of water in the storage.

How is a cone of depression formed in an unconfined aquifer?

The cone of depression formed in unconfined aquifer slowly due to gravity drains a large amount of water from the sediment within the increasing cone. The unconfined aquifers are formed at a faster rate as compared to confined aquifers because of their closeness to water resources like rain, rivers, lakes, or streams.

What leads to the formation of a'cone of depression'?

This leads to the formation of a 'cone of depression'. Let us take a look at the formation of a cone of depression in detail. A Cone of Depression is formed where the water table sinks at an exact point because of heavy pumping. Water is extracted out of the ground which leaves an airy space around the soil particles.

What does partial remission mean?

The DSM provides labels that describe the course of a person's Major Depression: "full remission" means no current depressive symptoms; "partial remission" means that the person currently has fewer than five depressive symptoms or has had no symptoms at all ...

What are the causes of depression?

Stressors capable of triggering major depression may include the death of a loved one and other significant losses such as a job layoff; or relationship difficulties such as divorce or separation. Other more typical sorts of life changes may trigger depression as well.

How long does it take to diagnose depression?

In order to diagnose someone with Major Depression, they must have had at least one Major Depressive Episode (in which they suffer from depressed mood, or the loss of interest or pleasure in nearly all activities) for at least two weeks.

What is it called when you have only one episode of depression?

When a person has experienced only one episode of depression, it is classified as Major Depression, Single Episode. When multiple Major Depressive Episodes occur in a row, and no manic or mixed episodes are observed, the diagnoses changes to Major Depression, Recurrent.

Can you have multiple major depressive episodes?

However, many people who experience one major depressive episode will go on to experience multiple major depressiv e episodes. The more major depressive episodes an individual experiences, the more likely they are to develop future episodes. Approximately 60% of people with MDD who experience a single depressive episode go on to have ...

Is depression recurrent or isolated?

The course of Major Depression, Recurrent varies across individuals. Some people have isolated depressive episodes that are separated by many years during which mood is normal, whereas other individuals experience clusters of major depressive episodes that occur closely together in time. Still other people with Major Depression experience ...

Can a blood test show depression?

At the present time, there is no diagnostic laboratory test (e.g., no blood test or brain scan) that can confirm whether you have Major Depression. However, some laboratory tests can appear abnormal during an active depressive episode. For example, sleep electroencephalograph (measurements of electrical activity in the brain during sleep) ...

What causes a cone of depression?

A cone of depression is caused due to heavy pumping in the area where the water table is located resulting in a large sunken area. In this ScienceStruck post, we shall take a look at what exactly a cone of depression is and how it is formed.

Why does a cone of depression not expand?

In this case, the cone of depression will not expand due to the supply of water from the lake or stream for that matter. On the contrary, if the cone comes in contact with any obstacle such as a bedrock, clay body, or edge of the aquifer, ...

Why are unconfined aquifers formed at a faster rate than confined aquifers?

The unconfined aquifers are formed at a faster rate as compared to confined aquifers because of their closeness to water resources like rain, rivers, lakes, or streams . The rate of replenishment is higher than that of the confined aquifers.

What happens when two cones of depression overlap?

If two cones of depression intersect or overlap each other, a ‘well interference’ is formed. The amount of water available to both the wells will be reduced. It may also happen that the cone of depression stretches to the nearby water bodies such as lakes or streams.

How does the shape of a cone affect the size of the well?

The farther you go from the well, lesser is the amount of decline. The shape of the cone is affected when it intersects a larger water body such as a lake or stream.

Does the cone of depression in confined aquifers grow at a faster pace?

The cone of depression in confined aquifer grows at a faster pace, but at a rate that diminishes gradually. The rate of replenishment is lesser. It takes a long time for confined aquifers to fill up as its only source is underground tributaries that travel long distances.

Unlock This Answer Now

Start your 48-hour free trial to unlock this answer and thousands more. Enjoy eNotes ad-free and cancel anytime.

What Is The Difference Between An Aquifer And An Aquitard

Aquifers are underground layers of very porous water-bearing soil or sand. Aquitards, by contrast, are compacted layers of clay, silt or rock that retard water flow underground that is, they act as a barrier for groundwater. Aquitards separate aquifers and partially disconnect the flow of water underground.

What Would Happen If A Cone Of Depression Extended Below The Bottom Of A Well

When water levels drop below the levels of the pump intakes, then wells will begin to pump air – they will “go dry.” … If the cone of depression extends to other nearby wells, the water level in those wells will be lowered. The cone develops in both shallow water-table and deeper confined-aquifer systems.

Why Do The Level Of Water Increase In Water Bodies After It Rains

In general, ground water level always rise in winter season due to increase in infiltration of rainwater, but infiltration rate depend on many factors such as, soil types, compaction, texture of soil, vegetation cover, moisture of soil, water content, water table deep of subsurface and climate conditions.

Confined And Unconfined Aquifers

Aquifers are water bodies formed underground, and can occur at various depths. They are created when the water seeps in through the Earths surface and permeable rock till the time it reaches the impermeable rock. The surrounding rock or sand layer is then saturated by ground water forming an aquifer.

How Do We Use Water In Our Daily Lives

To start, we all use water for drinking, washing, cleaning, cooking, and growing foodâmaking it our most precious resource for survival. What adds to that daily household water use, is that even more water is used by industry to generate electricity, manufacture products, and transport people and goods.

Glacial Sands And Gravel Aquifers

In Minnesota, where the state has been covered in ice at one time or another, sand and gravel deposited primarily by glacial meltwater streams is a common aquifer type. These may be at the surface or buried, of limited extent, or covering hundreds of square miles. They are mostly located in Central Minnesota.