What types of weather effect the flow of a river?

Question

I need to figure out how weather has an effect on the flow of a river. I'm not sure what would increase it or decrease it.

What makes the flow of the river increase? Decrease?

Answer 1

Two main natural factors:

1. The amount of rainfall in a given amount of time.
The heavier rainfall rates will result in an increase in flow.
No rainfall will like decrease the flow.

2. Air Temperature.
Colder temperature mean more will fall as frozen precipitation like snow. This can be a major factor if the river originates over the high mountains. Also with warmer temperature, snow fallen and deposited over the higher elevations over the cold winter season will melt more rapidly during the spring season warmup. This spring melt, with no rain, will also increase the flow of the river too.

Answer 2

1ofSelby' is right. Persistant rainfall does have an effect on the flow of a river, weatherwise. But think about temperature. If it gets too cold then the river will freeze then there wont be a flow. The same thing if it gets to hot. It will drain the water, by a good portion if not all.

Answer 3

Drought can seriously deplete a river's flow - and in two ways, as the rainfall diminishes, there's less run-off; and the surrounding populations will likely draw off more water to replace what hasn't fallen as rain.

Answer 4

Persistent heavy rains that cause flooding do cause rivers to change course. You might remember that perhaps ten years ago the Mississippi River's course was altered in places after a long period of flooding in the mid-west.

Answer 5

Mainly rain

Answer 6

Rain is where the water comes from that feeds most streams.

Answer 7

Warning stage
The stage on a fixed river gauge at which it is necessary to begin issuing warnings or river forecasts if adequate precautionary measures are to be taken before flood stage is reached.



Water
Dihydrogen oxide, molecular formula H2O.



Water balance
Balance of the water resources of a region, comparing precipitation and inflow with outflow, evaporation, and accumulation.



Water budget
See hydrologic accounting.



Water equivalent
The depth of water that would result from the melting of snow or ice, assuming measurement on a horizontal surface and no infiltration or evaporation.



Water-flow pyrheliometer
An absolute pyhrliometer, developed by C.G. Abbott, in which the radiation-sensing element is a blackened water-calorimeter.



Watershed
The total area drained by a river and its tributaries. Same as river basin.



Water-stage recorder
A device for obtaining a continuous record of stage at a point on a stream. The most common recorders consist of a float-actuated pen which traces a record on a clock driven chart.



Water table
The depth below which the ground is saturated with water. No water table exists if the ground water is confined by an overlying impermeable stratum, as in the case of artesian ground water.



Water year
Any twelve-month period, usually selected to begin and end during a relative dry season. Used a basis for processing streamflow and other hydrologic data. The period from October 1 to September 30 is widely used in the U.S.



Watt
A unit of power equal to one joule per second or 10' ergs per second.



Wave pole
A device for measuring sea-surface waves. It consists of a weighted pole below which a disk is suspended at a depth sufficiently deep for the wave motion associated with deepwater waves to be negligible. The pole will then remain nearly as if anchored to the bottom, and wave height and period can be acertained by observing or recording the length of the pole that extends above the surface.



Wave recorder
An instrument for recording ocean waves. Most recorders are designed for recording wind waves, that is waves of periods up to about 25 seconds, but some are designed to record waves of longer periods such as tsunamis or tides.



Wave staff
Same as wave pole.



Weather
The state of the atmosphere, mainly with respect to its effects upon life and human activities. As distinguished from climate, weather consists of the short-term (minutes to months) variations of the atmosphere.



Weather glass
An old nautical term for mercury barometer.



Weger aspirator
An instrument of the aspiration condenser type which measures the concentration and mobility of small ions.



Weighing rain gauge
A precipitation gauge consisting of a receiver in the shape of a funnel which empties into a bucket mounted upon a weighing mechanism. The weight of the catch is recorded as inches of precipitation.



Weight barograph
A recording weight barometer.



Weight barometer
A mercury barometer which measures atmospheric pressure by weighing the mercury in the column or cistern.



Wet-bulb depression
Difference between the temperatures of the dry-bulb and the wet-bulb thermometers of a psychrometer.



Wet-bulb temperature
The lowest temperature that can be obtained on a wet-bulb thermometer in any given sample of air. Obtained by evaporation of water (or ice) from the muslin wick. Used in computing dew point and relative humidity.



Wet-bulb thermometer
A thermometer with a muslin-covered bulb which is moistened. used to measure wet-bulb temperature.



White body
A hypothetical "body" whose surface absorbs no electromagnetic radiation of any wavelength. An idealization exactly opposite to that of the black body. In nature, no true white bodies are known. Moist white pigments exhibiting high reflectivity for visible radiation are fairly good absorbers in the infrared range, hence they are not white bodies in the sense of radiation theory. However, one does speak of a white body with respect to a particular wavelength interval. Compare to black body, gray body.



White rainbow
Same as fogbow.



Whole gale
Wind with a speed between 48 and 55 knots (55 and 63 mph), Beaufort scale number 10.



Wien's law
One of the radiation laws which states that the wavelength of maximum radiation intensity for a black body is inversely proportional to the absolute temperature of the radiating black body.



Wild fence
A wooden enclosure about sixteen feet square and eight feet high with a precipitation gauge at its center. The function of the fence is to minimize eddies around the gauge and thus insure a catch that is representative of the actual rainfall or snowfall.



Wilting point
Value of soil moisture, expressed as a percentage of the mass of dry soil, below which a plant living in the soil dies by wilting.



Wind
Air in motion relative to the surface of the earth. Almost exclusively used to denote the horizontal component.



Wind cone
Same as wind sock.



Wind direction
The direction from which the wind is blowing, measured in points of the compass or in azimuth degrees.



Wind gust
See gust and peak gust.



Windmill anemometer
A rotation anemometer in which the axis of rotation is horizontal. The instrument has either flat vanes (as in the air meter) or helicoidal vanes (as in the propeller anemometer). The relation between wind speed and angular rotation is almost linear.



Wind passage
The distance or length of flow of the air past a point during a given interval of time.



Wind rose
A flower-like diagram indicating the relative frequencies of different wind directions for a given station and period of time.



Wind run
The distance or length of flow of the air past a point during a given interval of time.



Winds aloft
The wind speed and direction at various levels in the atmosphere above the level reached by surface weather observations.



Winds-aloft observation
The measurement and computation of wind speeds and directions at various levels above the surface of the earth. Methods include pilot balloon observations, rabals, rawin or rawinsonde observations, radar tracking, or acoustic sounding.



Winds-aloft plotting board
A graphical aid used in the reduction of data from a winds aloft observation.



Wind shear
A local variation of the wind vector or any of its components in a given direction.



Wind sleeve
Same as windsock.



Wind sock
A fabric cone attached to a metal ring and used to indicate wind direction. often at airfields.



Wind speed
Rate of wind movement in distance per unit time.



Wind vane
An instrument used to indicate wind direction.



Wind vector
A component of the wind (often using Cartesian coordinates. i.e. X and Y wind vectors). Also, an arrow representing wind velocity, drawn to point in the direction of the wind and with a length proportional to wind speed.



Wind velocity
A vector term which includes both wind speed and wind direction.



Windward
Situated on the side from which the wind blows.



Windwave
A wave resulting from the action of wind on a water surface.



Wiresonde
An atmospheric sounding instrument which is supported by a captive balloon and used to obtain temperature and humidity data from the ground level to a height of a few thousand feet. The data is telemetered to the ground through a wire cable.



Wireweight gauge
A river gauge in which a weight suspended on a wire is lowered to the water surface from a bridge or other overhead structure to measure the distance from a point of known elevation to the water surface.



Word
A fixed-length group of bits representing the large data element handled as a unit by a computer. Word length is determined by the capacity of the CPU registers.



X

X-ray
Electromagnetic radiation of very short wavelength. lying within the wavelength interval of 0.1 to 1.5 angstroms (between gamma rays and ultraviolet radiation). X-rays penetrate various thicknesses of all solids, and they act on photographic plates in the same manner as light. Secondary x-rays are produced whenever s-rays are absorbed by a substance. In the case of absorption by a gas, this results in ionization.



Y

Yagi antenna
A type of directional antenna used on some types of radar and radio equipment consisting of an array of elemental, single- wire dipole antennas and reflectors.



Z

Zephyr
Any soft, gentle breeze.