What is overdraft in environmental science

Overdraft occurs when, over a period of years, more water is pumped from a groundwater basin than is replaced from all sources – such as rainfall, irrigation water, streams fed by mountain runoff and intentional recharge. [See also Hydrologic Cycle.]

What is overdraft aquifers?

SHARE. Groundwater overdraft occurs when groundwater use exceeds the amount of recharge into an aquifer, which leads to a decline in groundwater level. This condition is occurring in an increasing number of groundwater basins throughout California, and is impacting the state in many ways.

What are the consequences of overdrawing ground water?

This is most often caused by human activities, mainly from the overuse of groundwater, when the soil collapses, compacts, and drops. Excessive pumping in coastal areas can cause saltwater to move inland and upward, resulting in saltwater contamination of the water supply.

What is land overdraft?

Overdrafting is the process of extracting groundwater beyond the equilibrium yield of the aquifer. … In unconfined aquifers, there is no aquitard, and groundwater can be freely extracted from the surface.

What's the difference between infiltration and groundwater?

Groundwater is derived from rain and melting snow that percolate downward from the surface; it collects in the open pore spaces between soil particles or in cracks and fissures in bedrock. … The process of percolation is called infiltration.

How does groundwater become polluted?

Groundwater contamination occurs when man-made products such as gasoline, oil, road salts and chemicals get into the groundwater and cause it to become unsafe and unfit for human use. … For example, pesticides and fertilizers can find their way into groundwater supplies over time.

What can result from groundwater mining also known as groundwater overdraft )?

Overdraft: When groundwater extraction exceeds what is being replenished (also called “groundwater mining”). Its repercussions can include drying wells, sinking lands, reduced streamflow, degraded water quality, and higher energy use from pumping water from deeper depths.

What is saline water intrusion?

Saltwater intrusion is the movement of saline water into freshwater aquifers, which can lead to groundwater quality degradation, including drinking water sources, and other consequences. … As a result, saltwater can push inland beneath the freshwater.

What is overdraft Wikipedia?

An overdraft occurs when money is withdrawn in excess of what is on the current account. … If there is a prior agreement with the account provider for an overdraft, and the amount overdrawn is within the authorized overdraft limit, then interest is normally charged at the agreed rate.

What is the main reason for depletion of groundwater?

Subsidies on electricity and high MSP for water intensive crops is also leading reasons for depletion. Water contamination as in the case of pollution by landfills, septic tanks, leaky underground gas tanks, and from overuse of fertilizers and pesticides lead to damage and depletion of groundwater resources.

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What is groundwater mostly used for in the United States?

Groundwater supplies drinking water for 51% of the total U.S. population and 99% of the rural population. Groundwater helps grow our food. 64% of groundwater is used for irrigation to grow crops. … Groundwater is a source of recharge for lakes, rivers, and wetlands.

How is groundwater depleted?

The volume of groundwater in storage is decreasing in many areas of the United States in response to pumping. Groundwater depletion is primarily caused by sustained groundwater pumping. … increased pumping costs. land subsidence.

What is an example of infiltration?

Infiltration is the process by which precipitation or water soaks into subsurface soils and moves into rocks through cracks and pore spaces. As we mentioned before, the bulk of rainwater and melted snow end up infiltrated.

What is aquifer and infiltration?

Penetrating of atmospheric precipitation into an aquifer by mountain rock fracturing, through karst sinkholes and pores is called influation. Infiltration is characterized by a laminar groundwater movement, and influation, by turbulent flow.

What is the biggest importance of infiltration?

Why it is important: Infiltration is an indicator of the soil’s ability to allow water movement into and through the soil profile. Soil temporarily stores water, making it available for root uptake, plant growth and habitat for soil organisms.

How Punjab can overcome the problem of lowering water table?

Converting 1% of wheat area (35,000 hectares) in a year on drip irrigation system under rice-wheat cropping system, can arrest the decline of groundwater by 3cm per year. There will be 40-50% water saving if the area under fruits, vegetables, sugarcane, and cotton are brought under the drip irrigation system.

What are the causes of depletion of water table?

The two main causes of Depletion of Water Table are Deforestation and Over-pumping of groundwater.

Why is groundwater depletion in India?

Both natural and anthropogenic factors cause groundwater depletion in India. Groundwater pumping for irrigation remains the primary driver of groundwater depletion, which can further affect food and water security in India under climate change. Both in-situ and satellite-based measurements have issues and uncertainty.

What are 5 ways humans pollute groundwater?

Surface Contamination. …
Subsurface Contamination. …
Landfills and Waste Disposal. …
Atmospheric Contamination. …
Saltwater Contamination.

What are the main pollutants of water?

The main water pollutants include bacteria, viruses, parasites, fertilisers, pesticides, pharmaceutical products, nitrates, phosphates, plastics, faecal waste and even radioactive substances.

What are five ways to keep groundwater clean?

properly dispose of all waste; don’t dump chemicals down drains or on the ground.
test underground fuel oil tanks for leaks; if possible, replace them above ground.
safely store all chemicals and fuels.
minimize the use of chemicals; always use according to directions.

What is overdraft with example?

The definition of an overdraft is taking out more money than is in your account, or a draft of air that moves over a fire. An example of an overdraft is to write a check for $40 when you only have $20 in your account. An example of an overdraft is the air that passes over the fuel in a furnace.

How do you stop overdrafting?

Balance your checkbook. Keep track of your balance, transactions and automatic payments. …
Pay with cash. Or use your debit card. …
Create an artificial buffer. Keep a “pad” or cushion of money in your checking account, just to be safe. …
Use direct deposit. …
Link your checking account to another account.

Why is overdraft a thing?

An overdraft happens when you don’t have enough money in your checking or savings account to cover a withdrawal or payment and the financial institution then pays for the transaction anyway, which yields a negative balance in your account.

What is salt invasion?

Salinization on the coast, also called saline intrusion, is the increase of sodium ions in soil and water. … As the number of salt ions in the surrounding environment increase, water will naturally flow out of an organism toward the greater concentration of particles, causing dehydration and death.

How can we prevent saltwater intrusion?

Best management practices in areas at high risk of saltwater intrusion: Well drilling: Well siting: Avoid drilling in locations immediately adjacent to the coast e.g. within 50 m. Well depth: Avoid drilling excessively deep within areas proximal to the coast.

What is the effect of saltwater intrusion?

Saltwater intrusion can result in the need for water utilities to increase treatment, relocate water intakes, or development of alternate sources of fresh water. Saltwater intrusion, through surface or ground water sources, may diminish the availability or quality of source waters for drinking water utilities.

What are 5 effects of groundwater depletion?

Some of the negative effects of ground-water depletion include increased pumping costs, deterioration of water quality, reduction of water in streams and lakes, or land subsidence. Such effects, while variable, happen to some degree with any ground-water use.

What are the advantages and disadvantages of withdrawing groundwater?

The advantages of withdrawing groundwater include water for drinking and irrigation; availability and locality; low cost, no evaporation losses; and it is renewable. Disadvantages include aquifer depletion from over pumping, subsidence, pollution, saltwater intrusion, and reduced water flow.

What actions can the government take to protect the groundwater?

Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) (Superfund) – authorizes the government to clean up contamination caused by chemical spills or hazardous waste that do or could pose threats to the environment(groundwater).