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Topic: Hydrologic Cycle

In the News (Thu 24 Apr 14)

  Water cycle Summary
The hydrological cycle of a defined area of landscape is a balance between inputs of water with precipitation and upstream drainage, outputs as evaporation and drainage downstream or deep into the ground, and any internal storage that may occur because of imbalances of the inputs and outputs.
Hydrological budgets of landscapes are often studied on the spatial scale of watersheds, or the area of terrain from which water flows into a stream, river, or lake.
The major physical processes involved in the water cycle are the evaporation of water from the oceans and land, the transport of water in the atmosphere, condensation, precipitation over the oceans and land, and the flow of water from land to the oceans.
www.bookrags.com /Water_cycle   (5443 words)

 The Hydrologic Cycle
The hydrologic cycle can be thought of as a series of reservoirs, or storage areas, and a set of processes that cause water to move between those reservoirs.
The driving force for the hydrologic cycle is the sun, which provides the energy needed for evaporation just as the flame of a gas stove provides the energy necessary to boil water and create steam.
The properties of water and the hydrologic cycle are largely responsible for the circulation patterns we see in the atmosphere and the oceans on the earth.
www.visionlearning.com /library/module_viewer.php?mid=99&l=&c3=   (1778 words)

 Hydrology - Wikipedia, the free encyclopedia
Hydrological research is useful in that it allows us to better understand the world in which we live, and also provides insight for environmental engineering, policy and planning.
Marcus Vitruvius, in the first century B.C., described a philosophical theory of the hydrologic cycle, in which precipitation falling in the mountains infiltrated the earth's surface and led to streams and springs in the lowlands.
Hydrologic models are simplified, conceptual representations of a part of the hydrologic cycle.
en.wikipedia.org /wiki/Hydrologic   (1229 words)

 Hydrologic Cycle   (Site not responding. Last check: 2007-09-03)
The concept of the hydrologic cycle is central to an understanding of the occurrence of water and the development and management of water supplies.
Although the hydrologic cycle has neither a beginning nor an end, it is convenient to discuss its principal features by starting with evaporation from vegetation, from exposed moist surfaces including the land surface, and from the ocean.
Movement is, of course, the key element in the concept of the hydrologic cycle.
members.cox.net /bennowak/fluidearth/fere/hydrocycle.htm   (311 words)

 Virtual Vacationland: "Hands on" Activity
The hydrologic cycle is the continual movement of water from one place to another and from one state of matter to another.
The hydrologic cycle is one mechanism for distributing water and heat on Earth.
hydrologic cycle: the cycle of water exchange among the atmosphere, land, and ocean through the processes of evaporation, precipitation, runoff, and subsurface percolation.
www.bigelow.org /virtual/handson/hydrologic.html   (865 words)

 Water cycle - Wikipedia, the free encyclopedia
The water cycle — technically known as the hydrological cycle — is the continuous circulation of water within the Earth's hydrosphere, and is driven by solar radiation.
In the context of the water cycle, a reservoir represents the water contained in different steps within the cycle.
Water cycle slideshow, 1 Mb Flash multilingual animation highlighting the often-overlooked evaporation from bare soil, from managingwholes.com.
en.wikipedia.org /wiki/Hydrologic_cycle   (1381 words)

 The Hydrologic (Water) Cycle   (Site not responding. Last check: 2007-09-03)
Three percent is fresh of which 0.003 percent is in living organisms (plants and animals) and the soil, 0.6 percent is in underground aquifers, and the remainder is in ice.
Those with a basic understanding of the water cycle and how it functions should be a step ahead during the current drought.
However, the water cycle on your ranch or in your county is open.
www.noble.org /ag/research/Articles/Hydrologic/index.html   (385 words)

 Ohio's Hydrologic Cycle, AEX-461-94
This vast amount of water is in constant motion in a complex cycle known as the hydrologic cycle.
The hydrologic cycle, illustrated in Figure 1, describes the pathways that water travels as it circulates throughout the world by various processes.
The visible components of this cycle are precipitation and runoff; however, other components, such as evaporation, infiltration, transpiration, percolation, ground-water recharge, interflow, and ground-water discharge are equally important.
ohioline.osu.edu /aex-fact/0461.html   (2027 words)

 Hydrologic cycle - Encyclopedia of Earth
The hydrologic cycle is a conceptual model that describes the storage and movement of water between the biosphere, atmosphere, lithosphere, and the hydrosphere (see Figure 1).
Components of the hydrologic cycle include water vapor and clouds in the atmosphere, but also include liquid surface waters (oceans, lakes and streams) on continents as well as groundwater.
Often, rates of hydrologic activity are measured in terms of “mean residence time”, or the average amount of time that water remains in its various states or reservoirs.
www.eoearth.org /article/Hydrologic_cycle   (1367 words)

 Freshwater Website: Properties of water (The hydrologic cycle)
The endless circulation of water from the atmosphere to the earth and its return to the atmosphere through condensation, precipitation, evaporation and transpiration is called the hydrologic cycle.
Heating of the ocean water by the sun is the key process that keeps the hydrologic cycle in motion.
Although the hydrologic cycle balances what goes up with what comes down, one phase of the cycle is "frozen" in the colder regions during the winter season.
www.ec.gc.ca /water/en/nature/prop/e_cycle.htm   (561 words)

 Hydrologic Cycle and Interactions
The hydrologic cycle commonly is portrayed by a very simplified diagram that shows only major transfers of water between continents and oceans, as in Figure 1.
However, for understanding hydrologic processes and managing water resources, the hydrologic cycle needs to be viewed at a wide range of scales and as having a great deal of variability in time and space.
A more common hydrologic process that results in the presence of wetlands in some mountain valleys is the upward discharge of ground water caused by the change in slope of the water table from being steep on the valley side to being relatively flat in the alluvial valley (Figure 21, right side of valley).
pubs.usgs.gov /circ/circ1139/htdocs/natural_processes_of_ground.htm   (8629 words)

 A Summary of the Hydrologic Cycle: bringing all the pieces together
The hydrologic cycle begins with the evaporation of water from the surface of the ocean.
The balance of water that remains on the earth's surface is runoff, which empties into lakes, rivers and streams and is carried back to the oceans, where the cycle begins again.
The cycle begins as cold winds (horizontal blue arrows) blow across a large lake, a phenomena that occurs frequently in the late fall and winter months around the Great Lakes.
ww2010.atmos.uiuc.edu /(Gh)/guides/mtr/hyd/smry.rxml   (357 words)

 ODNR FS 93-18 The Hydrologic Cycle or Water Cycle
The hydrologic cycle (above) explains the exchange of water between the atmosphere, ground and surface of the Earth.
The hydrologic cycle is perhaps the most important natural phenomenon on Earth; it is the driving force behind most other natural processes.
The hydrologic cycle assures a reliable, although fluctuating, water supply by annually replenishing, or recharging, both surface and ground water sources.
www.dnr.state.oh.us /water/pubs/fs_div/fctsht18.htm   (655 words)

 ISWS - Illinois Water Cycle
The water cycle depicts water moving through the atmosphere and on and under the surface of the earth.
Another term for the water cycle is hydrologic cycle.
This depiction shows water moving through the water cycle in Illinois and is based on 30-year (1971-2000) averages calculated by Illinois State Water Survey scientists.
www.sws.uiuc.edu /docs/watercycle   (305 words)

 JetStream - An Online School for Weather: The Hydrologic Cycle
The Hydrologic Cycle involves the continuous circulation of water in the Earth-atmosphere system.
Of the many processes involved in the hydrologic cycle, the most important are
Evaporation is the change of state in a substance from a liquid to a gas.
www.srh.noaa.gov /srh/jetstream/atmos/hydro.htm   (417 words)

 Nitrogen and the Hydrologic Cycle, AEX-463-96
The form and movement of nitrogen are greatly influenced by components of the hydrologic cycle, which is particularly important for agriculture and the environment.
The purpose of this publication is to provide the reader with an overview of the nitrogen cycle and how it relates to the hydrologic cycle, and to help increase the reader's awareness of human activities that impact the quality and quantity of Ohio's water resources.
An in-depth discussion of the hydrologic cycle is beyond the scope of this publication.
ohioline.osu.edu /aex-fact/0463.html   (2678 words)

 Hydrologic/Water Cycle
The hydrologic cycle takes place in the hydrosphere,this is the region containing all the water in the atmosphere and on the surface of the earth.
The cycle is the movement of water through this hydrosphere.
To understand the hydrologic cycle, one must learn and study the water and its action in his/her own area.
www.und.edu /instruct/eng/fkarner/pages/cycle.htm   (710 words)

 Activity 1: The Hydrologic Cycle   (Site not responding. Last check: 2007-09-03)
Scientists call the constant endless movement of water from the atmosphere to earth to groundwater to river to ocean the hydrologic cycle.
Scientists predict it would take nine days to replace all of the atmospheric water and 37,000 years to replace all of the water in the ocean.
Draw the water cycle on a piece of paper.
web.em.doe.gov /soda/cycle.html   (203 words)

 Utah's hydrologic cycle - Utah Geological Survey
The hydrologic cycle is the continuous circulation of water among the oceans, continents, and atmosphere.
Along the Wasatch Front and for most of northwestern Utah, a special circumstance exists where the surface runoff and ground-water components of the hydrologic cycle cannot flow to the ocean, but are limited to Great Salt Lake's closed basin.
For a molecule of water to leave this basin, it must be evaporated and carried in clouds beyond the Wasatch Range, where it might fall as rain or snow, eventually flow into the Colorado River, and, with luck, on to the Pacific Ocean.
geology.utah.gov /surveynotes/gladasked/gladhydr.htm   (936 words)

 Managing Semi-Arid Watersheds: The Hydrologic Cycle
The hydrologic cycle consists of a system of water-storage compartments, and solid, liquid, or gaseous flows of water within and between the storage points.
However, the evapotranspiration component and its linkage to soil water storage and the movement of water off of a watershed is one of the hydrologic processes most affected by vegetative manipulations.
That part of the precipitation input that runs off a land surface and the part that drains from the soil and, as a consequence, is not consumed through evapotranspiration is the water-flow component of the hydrologic cycle.
ag.arizona.edu /OALS/watershed/watercycle.html   (594 words)

 How Groundwater Fits Into The Water Cycle
The water cycle, also known as the hydrologic cycle, begins when water from the earth’s soil, plants, and water bodies turns into water vapor through the process of evaporation.
Water has been transported through the water cycle for millions of years and will continue this cycle forever.
In the water cycle, water is constantly on the move.
www.groundwater.org /kc/gwwatercycle.html   (271 words)

 GROUND WATER-Primer-Hydrologic Cycle
Components of the hydrologic cycle are introduced and discussed.
The impact of human activities and structures on the water cycle are discussed.
The hydrologic cycle consists of inflows, outflows, and storage.
danpatch.ecn.purdue.edu /~epados/ground/src/cycle.htm   (546 words)

 Wellowner.org - The Hydrologic Cycle/   (Site not responding. Last check: 2007-09-03)
Perhaps the most important natural phenomenon on Earth, the hydrologic cycle describes the constant movement and endless recycling of water between the atmosphere, land surface, and under the ground.
The water in the hydrologic cycle is stored in any of the following reservoirs: the atmosphere, oceans, lakes, rivers, soils, glaciers, snowfields, and under the Earth's surface as ground water.
While the amount of water in certain places fluctuates, the hydrologic cycle provides a reliable supply of water by annually replenishing or recharging surface and ground water sources.
www.wellowner.org /agroundwater/hydrologiccycle.shtml   (578 words)

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