is there a differnce between a levee in a river and one in a lake?
365224
A river levee would form a bank to hold flowing water out of low-lying areas and guide it on a man-made path.  A lake levee would be called an earthen dam or a dike and its purpose would be to collect and hold water in a man-made stationary pool - preventing it from flowing away into areas lower than the desired level of the pool.
274234
It is because the water is always flowing and changing the river.  The water brings new things from up stream and washes current things down stream.  You can never count on a river to be the same as it was the last time you stepped in it.
57902
It can be very disruptive of fish species that depend on free-flowing rivers.  The hydropower dams in the Pacific Northwest of the United States have long been a source of controversy because of their impacts on salmon spawning.\n\nThe construction of dams to develop hydropwer can also flood archaeological treasures.  For example, the Glenn Canyon Dam flooded out many Native American artifacts.
284940
Totally false.  Waves do occur in ponds and lakes.\n\nIn fact, any really experienced sailor can tell you that when the wind is blowing strongly, shallow waters are more dangerous thaan deep ociean waters.\n\nFifty foot waves can and do occur in the Great Lakes.  Many ships, boats, and lives have been lost, especially during November.\n\nThe big waves in the Great Lakes come crashing ashore, against piers, and against the shoreline ice barrier that forms during winter.\n\nThey are as spectacular as many typical ocean waves, but it is true that you can get even bigger waves from the ocean, such as the ones used by surfers in Hawaii.
22387
It's also an alternate spelling for dike:\n\n1 : an artificial watercourse : DITCH\n2 a : a bank usually of earth constructed to control or confine water : LEVEE b : a barrier preventing passage especially of something undesirable\n3 a : a raised causeway b : a tabular body of igneous rock that has been injected while molten into a fissure
450444
Rivers empty into major bodies of water...tributaries empty into rivers
722824
water is denser than wood
486174
You are assuming that the water does flow in different directions when it actually doesn't.
108432
Boats do NOT displace more water than they weigh - the amount of water displaced is EQUAL to the weight of the boat. Salt water is heavier per cubic meter than pure water or fresh water, so a smaller amount of salt water would be displaced for the same weight boat. If the density of the solution was extremely high, as in mercury, the boat would appear to sit on top of the liquid.
252385
Wow! At last I found a good question & that too with a sensible asker who is wiling to do the research part. Here is my answer just for you-\n\nIn case of a flood, the flow of river is most of the times "turbulent". Do a Google search on "turbulence"+"fluids". Also search for "Mechanics of fluids".\n\nBut, the force in case of turbulent motion is pretty complicated so, I'll explain it in case of a slower speed of flood when the flow is "streamline" i.e. when the flow is not irregular.\n\nWhile flowing, the magnitudes of the velocities of streamliness are inversely proportional to the spacing between two streamlines in a plane. So, the narrower the hole is, more speedily the water will pass from it & thus, would exert more force.\n\nNow, try and do a Google search on these topics-\n1- Bernoulli's Principle\n\n2- Torricelli's Law of Efflux\n\nThose laws will help you with your report a lot.
680735
Oh! Deltas! Estauries are sunken river mouths. Good examples: China's Pearl River Delta, Argentina's La Plata, Maryland's Chesapeake Bay.\n\nBird's foot or digitate, that's where the river branches out at the mouth. Nile River Delta, the classic. Niger River Delta, and Mississippi Delta. \n\nArcuate. Hmmmm...I'm guessing it's roundish, but...I'm going to have to look it up! Yes, it's arc shaped, and the Ganges Delta is an example. Darn it! The Nile is, too! Oooh! Nice photo illustrating the Nile Delta article! Oh the Niger delta is, too! Guess that leaves the Mississippi Delta as a bird's foot!
837311
Dams and levees change the course of rivers.  Farmig, forestry, and suburban development lead to erosion.  Mining can change the forms of mountains.
684631
it may have to do with water pressure "lifting" ice off a frozen river causing it to buckle and open up.
546818
One.  Bassenthwaite Lake is the only body of water in the Lake district with the word "Lake" in its name!\n\n(Well, I assumed it had to be a trick question!)
600189
Water (rain, snow, dew, ...) which ends up higher than sea level will flow toward the sea if there is any possible path. Since even a mountainous 'bowl' is likely to have a porous bottom, or to fill enough to find an outlet, there will almost always be a flow to lower levels. \n\nFlowing water is not a neglibible force. It will, over geologic time move, dissolve, pulverize, and remove material. Freeze/thaw cycles contribute more than a bit; the Old Stone Face in new Hampshire in N America has recently fallen (literally) to this. Some of that material will be dropped downstream, filling in an existing channel. Spring floods (in places in which snow and ice accumulate on high ground) will provide an annual increase in this erosion, and if they break over channel banks, will accelerate the deposition process (eg, the Nile floods until the installation of dams to stop them). \n\nOver geologic time, a stream (or river) will fill channels repeatedly and will find new flow paths after doing so. What with dumping material from higher levels, and doing it in channels here and there across the gap between highlands, there will be a gradual acretion of soil in that gap. \n\nEventually, the flowing water, combined on occasion with wind and plant and animal soil processing (earthworms, for instance), there will be a more or less level filiing of the gap between highlands, with water flowing across it on the way to the sea. \n\nThat space, with a history more or less as sketched is a valley. Tehy can be narrow (a kilometer or less) or wide (several hundred kilometes). In fact, they can be so wide that it's not possible for a human to see both highlands between which the water flows at the same time. Valleys can also be very long if the highlands are arranged to permit. Consider the Nile, the Danube, the Volga, the Mississippi, or the Ganges. \n\nIn short, highlands erode, flatten out, and fill in the gaps between them. This can be seen in Britain (whose hills and mountains wer once higher) and in the North American Appalacians (whcih were once very very impressively tall). The N American Rockies, S American Andes, and Asian Himalyas are examples of the early stages in this process. Some millions of years hence, all three of these mountain ranges will be much lower and rounder.
702037
I have never heard of the term.  I would guess that it is the distance from the furthest portion of a tributary area to the outlet of the area.
161011
River morphology (shape) is controlled by a number of characteristics. River channels can be broken into three types, straight rivers, single channel meandering rivers, and braided rivers (multi-channel). The amount and size of the sediment the river carries, the slope of the river channel, and the amount of water in the river determine the shape of the river channel. \n\nStraight rivers tend to have the lowest sediment load and the lowest slope. Meandering rivers have slightly more slope, and much more sediment load, and braided rivers have both the highest slopes and greatest sediment loads. \n\nRiver channels in cross section often have a cup-like  shape with the deepest portion, known as the thalweg, found on one side or the other. This thalweg has the highest flow velocity and because it flows faster it can cut into the bank it is closest to, while the shallow part of the river slows down and drops sediment. This action causes both meandering rivers and braided rivers to move their channels from side to side in a valley over time. Straight channel rivers also have thalwegs that move but the effect is much less. \n\nAs rivers go from mountainous terrain to nearly flat valleys they change from braided streams and rivers to meandering rivers. As they approach sea level they form deltas where the flow often separates into separate branching channels. A great deal of the sediment load of the river is deposited on the delta, and as the river flows into the ocean it builds the delta outward. Rivers like the Mississippi have built deltas far out into the ocean with sediment piles that are several miles deep.