Because water flows down to lower points, the cone of depression could change the direction groundwater flows in. That might change what you find IN your well water; if there’s a source of pollution near your well, the cone of depression might affect whether the pollution flows toward or away from the well.
What are the consequences of a cone of depression?
The cone of depression from a well might extend to a nearby stream or lake. This lowers the water table below the stream or lake level. As a result, the stream or lake begins to lose water to the groundwater aquifer near the well.
Cone of depression: A depression in the groundwater table or potentiometric surface that has the shape of an inverted cone and develops around a well from which water is being withdrawn. The slopes of the cone become increasingly steep the closer they are to the well.
What would happen if a cone of depression extended below the bottom of a well?
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.
The cone of depression changes size If there is no precipitation to recharge the aquifer, and the well keeps pumping, the pump will pull water from a greater distance, and the cone of depression will get deeper and wider. After heavy precipitation, with good recharge, it will get smaller.
How did this cone of depression in the groundwater form quizlet?
How did this cone of depression in the groundwater form? An artesian spring flowed upward on all sides. The earth’s rotation causes groundwater to twirl in a counterclockwise direction. Groundwater is pumped from the well faster than it can flow to replenish what is lost.
What contamination of groundwater is a major concern?
Underground water can get contaminated from industrial, domestic, and agricultural chemicals from the surface. 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.
What is cone of depression and its use in civil engineering?
Cone of depression represent the water table during the drawdown of water with the help of well through homogeneous and isotropic aquifer. In un-confined aquifer cone of depression represent the drawdown water table but in confined aquifer it represent the pressure drop (change in piezometric head) around the well.
What is drawdown and how does it relate to the cone of depression?
What is drawdown, and how does it relate to the cone of depression? Drawdown is the term describing the process in which the water table around a well is lowered because of water discharge. This depression in the water table is conical and is called a cone of depression.
What is drawdown and how does it relate to the cone of depression quizlet?
Relate drawdown to cone of depression. Drawdown is when the water table around a well is lowered due to withdrawalof water from the well. The resulting depression within the water table is called a cone of depression.
What is a cone of depression what causes it and why can large cones of depression be a serious problem?
As the water flows into the well, the water levels or pressure in the aquifer around the well decrease. The amount of this decline becomes less with distance from the well, resulting in a cone-shaped depression radiating away from the well.
What’s a cone of depression Brainly?
A cone of depression occurs in an aquiferwhen groundwater is pumped from a well. In an unconfined aquifer (water table), this is an actual depression of the water levels. In confined aquifers (artesian), the cone of depression is a reduction in the pressure headsurrounding the pumped well.
Which of the following best describes the cone of depression?
Which of the following best describes the cone of depression? A dimple in the water table surface due to water pumped faster than an aquifer can be replenished. To ensure a continuous supply of water, a well must do what? When water is pumped from a well, drawdown occurs.
What happens to the cone of depression if groundwater pumping increases?
In general, larger cones of depression result from larger pumping rates, higher permeability or lower storativity, and longer elapsed time. If cones of depression from two separate pumping wells grow large enough to overlap, it is known as well interference.
How does loss of groundwater affect the ground and how can we measure this?
A related effect of groundwater pumping is the lowering of groundwater levels below the depth that streamside or wetland vegetation needs to survive. The overall effect is a loss of riparian vegetation and wildlife habitat. The basic cause of land subsidence is a loss of support below ground.
How does the drop in the water table during a drought affect the operation of the well?
During severe droughts, people rely heavily on groundwater”the water held underground in aquifers. An aquifer can become depleted when more water is pumped out of it than is replenished by rainfall or other water sources. If the water level drops below the point of your pump intake, the pump could be damaged.
When water is withdrawn from a well a cone of depression is created in which quizlet?
When water is withdrawn from a well, a cone of depression is created in which: a. the water table in the vicinity of the well is temporarily lowered.
What is a possible consequence of overpumping of groundwater?
It can cause land subsidence, because as water is removed from the soil, it collapses and drops. Since groundwater that is very deep or below the oceans is saline, overpumping can cause the saltwater to move inland or upwards, resulting in saltwater intrusion, which can contaminate fresh drinking water.
What could happen if this well is Overpumped quizlet?
What could happen if this well is overpumped? The bottom of the lens of fresh water will rise, causing the well to draw in salt water. Which way is groundwater flowing in this cone of depression?
What factors can affect the quality of groundwater?
Natural factors, such as topographic position and the mineral composition of underlying geology, act to produce basic physical and geochemical conditions in groundwater that are reflected in physical properties, such as pH, temperature, specific conductance, and alkalinity, and in chemical concentrations of dissolved …
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.
What are two things that threaten groundwater supplies?
Road salt, toxic substances from mining sites, and used motor oil also may seep into groundwater. In addition, it is possible for untreated waste from septic tanks and toxic chemicals from underground storage tanks and leaky landfills to contaminate groundwater.
Why might the ground subside after groundwater is pumped to the surface?
Why might the ground subside after groundwater is pumped to the surface? as water is withdrawn, the water pressure drops, and the sediment is left to support the weight on top of it. as a result, the sediment packs more closely together, causing the ground to subside.
How would the water table be affected if Earth were made up of uniform permeable material?
How would the water table be affected if Earth were made up of uniform, permeable material? the water table would not exist. Why does groundwater discharge to Earth’s surface? Earth’s surface is irregular, and permeability decreases with depth within Earth.
What is drawdown cone?
This depression in the water table is known as the cone of depression. The vertical difference, at any given point, between the original (or static) water level and the water surface formed by the cone of depression is called the drawdown.
What problem is caused by pumping groundwater for irrigation in the Southern High Plains?
What problem is caused by pumping groundwater for irrigation in the Southern High Plain? A low precipitation rate and a high evaporation rate allow little water to recharge the aquifer.
What is transmissivity in hydrogeology?
Transmissivity is measured as the rate at which groundwater can flow through an aquifer section of unit width under a unit hydraulic gradient.
What is the cone of depression quizlet?
Occurs in an aquifer when groundwater is pumped from a well. In an unconfined aquifer (water table), this is an actual depression of the water levels.
How are springs affected by faulting quizlet?
How are springs affected by faulting? Faults provide a permeable pathway for groundwater movement to the surface. Which two uses consume most freshwater in the United States? Which of the following combinations make for the best groundwater reservoir?
How do glaciers acquire their load of sediment quizlet?
How do glacier’s acquire their load of sediment? Glaciers move, and as they do, they scour the landscape, “carving” out landforms. As they move, they pick up and carry sediment particles of various sizes.
What would happen if a cone of depression extended below the bottom of a well?
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.
What causes saltwater intrusion?
As sea levels rise along the coasts, saltwater can move onto the land. Known as saltwater intrusion, this occurs when storm surges or high tides overtop areas low in elevation. It also occurs when saltwater infiltrates freshwater aquifers and raises the groundwater table below the soil surface.
What is the surface of the zone of saturation known as?
The water table is the upper surface of the zone of saturation. The zone of saturation is where the pores and fractures of the ground are saturated with water.
What is cone of depression and its use in civil engineering?
Cone of depression represent the water table during the drawdown of water with the help of well through homogeneous and isotropic aquifer. In un-confined aquifer cone of depression represent the drawdown water table but in confined aquifer it represent the pressure drop (change in piezometric head) around the well.
What is groundwater and how does it relate to the water table?
What is groundwater, and how does it relate to the water table? groundwater is water that occupies the zone of saturation within the ground. the water table is the upper limit of the groundwater.
What feature can form on the ground as a result of a cone of depression forming?
The cone of depression from a well might extend to a nearby stream or lake. This lowers the water table below the stream or lake level. As a result, the stream or lake begins to lose water to the groundwater aquifer near the well. This is know as induced recharge.
What is cone of depression in groundwater?
Cone of depression: A depression in the groundwater table or potentiometric surface that has the shape of an inverted cone and develops around a well from which water is being withdrawn. The slopes of the cone become increasingly steep the closer they are to the well.
How did this cone of depression in the groundwater form quizlet?
How did this cone of depression in the groundwater form? An artesian spring flowed upward on all sides. The earth’s rotation causes groundwater to twirl in a counterclockwise direction. Groundwater is pumped from the well faster than it can flow to replenish what is lost.
How does pumping affect groundwater flow?
Under this condition, the ground-water divide between the well and the stream is no longer present, and withdrawals from the well induce movement of water from the stream into the aquifer. Thus, pumping reverses the hydrologic condition of the stream in this reach from ground-water discharge to ground-water recharge.
How can groundwater depletion affect streams and water quality?
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.
How does groundwater affect the environment?
Some human activities, such as pumping water into the ground for oil and gas extraction, can cause an aquifer to hold too much ground water. Too much ground water discharge to streams can lead to erosion and alter the balance of aquatic plant and animal species.
What conditions affect groundwater availability?
The availability of groundwater as a water source depends largely upon surface and subsurface geology as well as climate. The porosity and permeability of a geologic formation control its ability to hold and transmit water.
How does drought affect well water?
During severe droughts, people rely heavily on groundwater”the water held underground in aquifers. An aquifer can become depleted when more water is pumped out of it than is replenished by rainfall or other water sources. If the water level drops below the point of your pump intake, the pump could be damaged.
How does poor rainfall affect the water table?
Answer: Poor rainfall increases drought by which the heat of the sun act on water and dry it faster it also decreases water due to constant use. We use groundwater for our daily needs. … If there is no rainfall, the groundwater will not get charged and this will affect the ground table.
What percentage of water evaporated over land and water eventually ends up as precipitation?
Only about 10 percent of the water evaporated from the oceans is transported over land and falls as precipitation.
Which of the following statements is true concerning unconfined aquifers in urbanized coastal areas?
Which of the following statements is TRUE concerning unconfined aquifers in urbanized coastal areas? Any salty water in the aquifer will rise if the water table is lowered by pumping. In areas underlain by unconsolidated or weakly consolidated strata, lowering of the water table can cause the land to subside.