What is the average velocity of a river?
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That really depends on your definition of river and which river, and at what point on the river and the unit of measurement.
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x=v(horizontal velocity of water hitting ground)*t( time of travel)\n  = sqrt(2gy) *t; from equation v^2=2gy\nt= sqrt(2h/g); from equation h=.5*g*t^2\nthere you get that equation. I did with kinematics.
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Earth's speed changes from time to time.  The average is 29.783 kilometers/second or 107,218 kilometers/hour.
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The measurement of a river’s meander is quantified with a value known as sinuosity index. For single channel rivers, excluding braided channels, this is defined as :\n\nSI = length of channel axis/length of meander belt axis\n\nThis sinuosity index has been used to separate single channel rivers into three general classes: straight (SI < 1.05), sinuous (SI 1.05-1.5), and meandering (SI > 1.5)\n\nGenerally as gradient decreases, the sinuosity index increases.  To say that meandering causes changes in gradient would be misleading. The overall channel pattern is a response by the river to balance its energy expenditures as it carries load and discharge. The river’s tendency to meander is related to its discharge, and its type and amount of sediment load as well as the gradient.\n\nWavelength and amplitude of river meanders are not random. They are controlled by aspects of overall load, discharge, and gradient. In addition to lateral migration of channels, there is a long-channel variation that forms patterns of riffles and pools.  These riffle-pool patterns  which are related to flow cells tend to initiate bank erosion and develop meander bends.\n\nMount, Jeffrey F. 1995\n“California Rivers and Streams:  The Conflict Between Fluvial Process and Land Use”\n\n\nI’m a geologist.
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the average orbital velocity of earth is 29.783 km/s.\n\nhttp://en.wikipedia.org/wiki/Earth
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Easy, the Amazon has the largest capacity in the world at around 219,000 cubic metres per second and a drainage basin of almost 7,000,000 square kilometres, whilst the second place Congo has only 41,800 cubic metres per second and a 3,680,000 square kilometre drainage basin.  The Amazon wins handily.\n\nHope this helps.\n\nNote: The Nile, though the longest river in the world with an impressive 3,600,000 square kilometre drainage basin doesn't come close to the average discharge of the Amazon, at only around 5000 cubic metres per second.
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Velocity is a vector (basically something that has direction and speed) whereas speed it just a magnitude expressed in terms of its absolute value.
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A hydrograph shows the flow in a stream over time.  The shape might be described as "peak and trough" line graph.  Here's a quick website to look at for an example of a hydrograph:\n\nhttp://mrbdc.mnsu.edu/major/midminn/subshed/sevenmi/vtour/hydrograph.html
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The main parts of a river include a channel, in which the water flows, and a floodplain—a flat region of a valley on either side of the channel. Through the channel and floodplain, water and sediment—material transported by the river, such as sand and silt—are transferred from ridges and mountains to the sea or to a lake. A river starts on hillsides as small channels, or rills. The rills combine to make larger channels or tributaries that eventually come together, forming distinct streams. The largest channels formed by this convergence of tributaries are rivers, and they can carry large quantities of fresh water and sediment across continents.
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Is the speed at which it travels.
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The headwaters for a stream may start at relatively high elevations fed by ice cold snow melt and springs.  Velocity is greatest moving down a mountain slope and purity may also be greatest in runoff water.  Further downstream, the velocity may be less due to a smaller gradient but volume may increase because of tributaries and additional springs.  Mineral contant may increase downstream because of contributions from groundwater.  Sediment and silt may become finer downstream due to less gradient and veloocity.  Temperature may increase downstream because of solar energy heating inflow.  Biological load may increase downstream as the stream passes fertile terrain with organic matter including decayed materials.  Polution may increase downstream because of the influence of man including farms and factories and municipal sewage treatment outflows.
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The water starts from one end and reaches the other end in 30 minutes\n\nThe distance traveled is 1700 meter. Time taken 30 minutes = 1800 second.\n\nThe velocity is distance traveled per second. Therefore, it is 1700 /1800 m/s =0.94m/s
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if the question is: If it takes 3 hours to travel 24 miles downstream and 6 hours to travel UPstream, how fast is the current? then,\nlets call the travelling speed Vt and the current speed Vc\ndownstream we have Vt+Vc=24miles/3hours=8mph\nupstream we have Vt-Vc=24/6=4mph\nto solve the system of two equations we can add the equations and get 2Vt=12, Vt=6mph\nVc=8-6=6-4=2mph\nThe current is 2mph fast.
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If you mean river rapids: water traveling from a higher to a lower elevation over obstacles.  The obstacles cause turbulence in the water called rapids.  Variables are: water volume; rate of elevation drop; size/number of obstacles.
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Impossible to answer. No one has ever counted them all and how do you define a river? Here what we define as a river may de called a creek over there.\n\nGod is the only one I know who truely knows the answer to this question.\n\nThe answer would be in the 100,000's though.
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The average speed is 28 mph.\nAverage distance is 7-10 inches.
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The boats path as viewed from an observer on the bank will be a the hypotenuse of a right triange.  It moves along that hypotenuse at a speed of 4.5 m/s and has traveled 27 m on that path.  therefore the time it took to get across was 27/4.5 seconds.  In that time, it travelled downstream 11m.  The river current is what was carrying it downstream and moved the boat 11m in 27/4.5 second.  Velocity is distance/time so the river current is 11 / (27/4.5) m/sec