Sentences with phrase «deep groundwater wells»

DEEP WATER Deep groundwater wells, such as this hand - pumped well in Uganda being operated by water resources scientist Scott Jasechko, can contain mixes of old and young water and traces of pollution.

Not exact matches

Human groundwater contamination can be related to waste disposal (private sewage disposal systems, land disposal of solid waste, municipal wastewater, wastewater impoundments, land spreading of sludge, brine disposal from the petroleum industry, mine wastes, deep - well disposal of liquid wastes, animal feedlot wastes, radioactive wastes) or not directly related to waste disposal (accidents, certain agricultural activities, mining, highway deicing, acid rain, improper well construction and maintenance, road salt).

Comparing the relative abundance of these carbon isotopes in the various wells, the researchers discovered that over half of wells more than 250 meters deep yielded mostly groundwater at least 12,000 years old.

How new groundwater enters deep wells is still unclear, Jasechko says.

The deeper the well, the more likely it is to contain a larger share of «fossil» groundwater that's at least 12,000 years old.

Overall, pesticides were less common in so - called groundwater, such as that in wells, although 33 percent of deep wells that tap aquifers contained one or more of the chemicals.

The agency tested the water in the shallow wells that tap the groundwater above the 169 gas - producing wells in the field; in two municipal wells in the town; and in several surface and deep wells that it drilled for monitoring purposes.

The team collected samples of methane from settings such as lakes, swamps, natural gas reservoirs, the digestive tracts of cows, and deep ancient groundwater, as well as methane made by microbes in the lab.

«And nearby wells allow us to look at concentrations of the chemicals that reached the relatively deep groundwater across the site.»

The team used a submersible pump in deep wells to obtain groundwater samples at depths of 280 to 1,300 meters from seven locations in the fault zones surrounding the epicenter 11 days after the earthquake in April 2016.

So much groundwater pumping raises issues, though, as it pushed the water table lower and lower, causing shallower wells to dry up and deeper and deeper wells to be drilled.

«And nitrate is a groundwater contaminant in many wells in Wisconsin, so it's not just the plants that benefit if the nitrate does not infiltrate deeper and deeper into the ground.»

Read both a national and industry perspective on Deep Earth Imaging, the opportunities for sourcing mineral, energy and groundwater resources, as well as some of CSIRO's other major investments that could benefit the minerals and mining industry.

The groundwater table in the Central Valley has been declining to such a degree that it requires a deeper understanding of the temporal dynamics of drought as well as their dependence on regional climate variability and change.

Developing energy from shale (and other tight - rock formations) using hydraulic fracturing and horizontal drilling takes four to eight weeks — from preparing the site for development to production itself — after which the well can be in production up to 40 years.10 A well can be a mile or more deep and thousands of feet below groundwater zones vertically, before gradually turning horizontal.

As the well is drilled deeper, additional casing is installed to isolate the formation (s) from which oil or natural gas is to be produced, further protecting groundwater from the producing formations in the well.

[6] The main methods of disposing of produced water involve pumping it back into oil - or gas - producing wells to bolster production, or injecting it deep into other formations below usable groundwater resources.

The team collected samples of methane from settings such as lakes, swamps, natural gas reservoirs, the digestive tracts of cows, and deep ancient groundwater, as well as methane made by microbes in the lab.

As groundwater levels drop, a variety of negative consequences result: pumps must pull water up from deeper depths, increasing energy use; new wells are drilled and pumped, driving up costs; and groundwater tables drop lower, which may harm streams and ecosystems.

This condition, known as «overdraft,» has a number of significant consequences, including loss of stream flows, increased costs and energy use as wells are drilled deeper, ecosystem degradation, and potential salinization of groundwater due to seawater intrusion.

At soil depths greater than 30 feet below the surface, the soil temperature is relatively constant, and corresponds roughly to the water temperature measured in groundwater wells 30 to 50 feet deep.

The deeper the red, the emptier the region's groundwater stores — a better measurement for drought than surface water, since it's not as easily replenished — as compared to the average registered amount between 1948 and 2009.

It detailed how drilling deeper wells was speeding up contamination of groundwater supplies, and it provided the first 3D groundwater map which can help researchers show where water supplies are safe for drinking, and where water purification is needed.

Nebraska argued that the compact didn't cover groundwater use because it was signed before deep - well irrigation was used in the river basin.