which of the following is true about how contamination moves in groundwater

Which Of The Following Is True About How Contamination Moves In Groundwater?

Which of the following is true about how contamination moves in groundwater? Contamination spreads out as it moves, forming a widening plume.

How does contamination move in the groundwater quizlet?

Liquid hazardous substances are spilled and soak down through the soil or rock into the groundwater. Rainwater or surface water comes into contact with contaminated soil while seeping into the ground, becomes polluted and carries the pollution from the soil into the groundwater.

What happens to the water table if groundwater is pumped out faster than it can be replaced?

If water is withdrawn from the ground at a faster rate that it is replenished, either by infiltration from the surface or from streams, then the water table can become lower, resulting in a “cone of depression” around the well.

How will the water in this stream interact with the groundwater?

Surface water and groundwater systems are connected in most landscapes. Streams interact with groundwater in three basic ways: streams gain water from inflow of groundwater through the streambed, streams lose water by outflow through the streambed, or they do both depending upon the location along the stream.

What is the main way groundwater accumulates?

What is the main way groundwater accumulates? Precipitation and surface water infiltrate through the upper layers of soil.

Which of the following are sources of groundwater contamination?

Potential Sources of Groundwater Contamination

  • Storage Tanks. May contain gasoline, oil, chemicals, or other types of liquids and they can either be above or below ground. …
  • Septic Systems. …
  • Uncontrolled Hazardous Waste. …
  • Landfills. …
  • Chemicals and Road Salts. …
  • Atmospheric Contaminants.

Which factors are sources of groundwater contamination?

The significant sources of contamination in groundwater are farming chemicals, septic waste, landfills, uncontrolled hazardous waste, storage tanks, and atmospheric pollutants.

Why does a plume of contamination spread out become wider away from the source of contamination?

Solutions for Chapter 17Problem 118MCQ: Why does a plume of contamination spread out (become wider) away from the source of contamination? … because of diffusion of the contamination and mixing of contaminated and uncontaminated waterC.

What happens when groundwater is over pumped?

Excessive pumping can lower the groundwater table, and cause wells to no longer be able to reach groundwater. … When groundwater is overused, the lakes, streams, and rivers connected to groundwater can also have their supply diminished. Land Subsidence. Land subsidence occurs when there is a loss of support below ground.

What are the environmental impacts of groundwater usage?

The extreme use of groundwater resources can have serious concerns, such as uplifting and seismic activities, ecological environment deterioration, land subsidence, vegetation degradation, livelihoods for rural poor, and food security implications.

Why do groundwater and surface water have different contaminants?

2: Why might groundwater and surface water have different contaminants? These two bodies of water are placed in completely different locations allowing exposure to different kinds of contaminants.

How does water move between groundwater and surface water when the water table is high?

Under the pull of gravity, groundwater flows slowly and steadily through the aquifer. In low areas it emerges in springs and streams. Both surface water and groundwater eventually return to the ocean, where evaporation replenishes the supply of atmospheric water vapour.

Why does water move ground to groundwater?

At a certain depth below the land surface, the spaces between the soil and rock particles can be totally filled with water, resulting in an aquifer from which groundwater can be pumped and used by people. Some of the precipitation that falls onto the land infiltrates into the ground to become groundwater.

Which is the most common contamination source for freshwater resources?

Which is the most common contamination source for freshwater resources? Runoff. A community decides to upgrade its water purification and management systems.

How does water spread through the ground?

Water seeps into the ground much like a glass of water poured onto a pile of sand. … The water moves downward through empty spaces or cracks in the soil, sand, or rocks until it reaches a layer of rock through which water cannot easily move. The water then fills the empty spaces and cracks above that layer.

How does water become groundwater?

Groundwater begins as rain or snow that falls to the ground. This is called precipitation. Only a small portion of this precipitation will become groundwater. Most will run off the land surface to become part of a stream, lake or other body of water.

How groundwater contamination occurs from landfill?

Improper design of landfill sites may cause serious problems to groundwater. Leachate, a very concentrated pollutant generated from the decomposition of waste and by precipitation, may penetrate through the waste layers and go straight to the aquifer.

How do landfills pollute groundwater?

The solid waste placed in landfills or open dumps are subjected to either groundwater underflow or infiltration from precipitation or any other possibility of infiltration of water. … Such contamination of groundwater results in a substantial risk to local groundwater resource user and to the natural environment.

What do you mean by contamination of groundwater?

Groundwater pollution (also called groundwater contamination) occurs when pollutants are released to the ground and make their way into groundwater. … The pollutant often creates a contaminant plume within an aquifer. Movement of water and dispersion within the aquifer spreads the pollutant over a wider area.

How can groundwater contamination be prevented?

What can I do to reduce pollution?

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

How do you clean up groundwater contamination?

Pump and treat is a common method for cleaning up groundwater contaminated with dissolved chemicals, including industrial solvents, metals, and fuel oil. Groundwater is extracted and conveyed to an above-ground treatment system that removes the contaminants.

What are some sources of groundwater contamination Why is groundwater pollution such a difficult problem?

Why is groundwater pollution such a difficult problem? Groundwater contamination can happen because of septic systems, landfills, and industrial activity that leaches pollutants into the aquifer recharge zone. Deep wells provide a direct method for pollution to enter groundwater.

Why does a plume of contamination spread?

A plume of contaminated ground water may be formed when substances are released to ground water from a source at a facility. … This movement of contaminants throughout an aquifer usually occurs in the direction of ground water flow but can spread against the predominant flow direction.

What happens as a contaminant moves?

Chemical retardation occurs when a solute (contaminant) reacts with the porous media and its rate of movement is retarded relative the advective groundwater velocity. … Retardation rates of contaminants are highly variable and typically range from 0 to 10 times slower than the advective groundwater velocity.

What is contaminant fate?

Chemical Fate- The eventual disposition of a chemical contaminant. This can include destruction or long term storage in a sink and/or exposure-biotransformation in ecological and human receptors.

What are the problems stemming from the removal of groundwater?

reduction of water in streams and lakes. deterioration of water quality. increased pumping costs. land subsidence.

How groundwater can affect the construction process?

Groundwater is found beneath the Earth’s surface in soil pore spaces and rock formation fractures. … Whenever construction must take place below the water table or soil is used to retain water, groundwater affects the project by impacting the function and design of the facility, and the cost of its construction.

Can most chemical contaminants be easily removed from groundwater?

Most chemical contaminants can be removed easily from the groundwaters and aquifers. If the recharge areas of confined aquifers are polluted, the the aquifer becomes polluted, too.

What are three environmental problems with groundwater?

Three environmental problems are to be discussed in a detail: nitrate pollution in the groundwater, salination, and groundwater level draw down.

What are 4 effects of groundwater depletion?

Ground-water depletion is primarily caused by sustained ground-water pumping. 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.

How is groundwater mining negatively affecting the water supply?

Water running through mine tailings can become polluted.

The resulting chemicals in the water are sulfuric acid and dissolved iron. … The acid runoff further dissolves heavy metals such as copper, lead, mercury into groundwater or surface water.

What contaminants are found in groundwater samples?

Microbiological contaminants found in groundwater

Used as an indicator for the presence of pathogenic bacteria, viruses, and parasites from domestic sewage, animal waste, or plant or soil material. Bacteria, viruses, and parasites can cause polio, cholera, typhoid fever, dysentery, and infectious hepatitis.

Where in the US is contamination of groundwater a major concern?

This includes chemicals such as pesticides and herbicides that many homeowners apply to their lawns. Contamination of groundwater by road salt is of major concern in northern areas of the United States.

Why might groundwater and surface water have different contaminants quizlet?

Groundwater typically contains less contaminants than surface water because the porous rocks that let the water into the ground act as natural filters. Also, surface water can be easily polluted by things such as rainwater runoff, biological and chemical contaminants, sewage, etc.

How Can Groundwater Contamination be Identified?

Our Groundwater Connection: Contamination

Understanding Groundwater Contamination: Session 1 Introduction

Understanding Groundwater Contamination: Session 5 Chemical Behavior in Groundwater

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