Discharge is the volume of water moving down a stream or river per unit of time, commonly expressed in cubic feet per second or gallons per day.
What is the difference between stream load and discharge?
Stream discharge is the quantity (volume) of water passing by a given point in a certain amount of time. … Streams carry dissolved ions as dissolved load, fine clay and silt particles as suspended load, and coarse sands and gravels as bed load. Fine particles will only remain suspended if flow is turbulent.
What is peak stream discharge?
Flood or peak discharge The maximum rate of flow, in cubic feet per second, that occurred. during a flood.
How is stream discharge measured?
Discharge is the volume of water moving down a waterway per unit of time. It is most commonly expressed in cubic feet per seconds or gallons per day. To calculate discharge, multiply the area of water in a channel cross section by the average velocity of water in that cross section.What are the three factors that determine the discharge of a stream?
- 1) Rock and soil type.
- 2) Weather conditions.
- 3) Type and amount of Rainfall.
- 4) Type of land.
What is stream gradient?
Gradient. The slope of a stream, GRADIENT, is described as the change (loss) of elevation of the stream with distance downstream.
What is the base level of a stream?
Base level is defined as the limiting level below which a stream cannot erode its channel. For streams that empty into the oceans, base level is sea level.
What is stream stage?
Stream stage is an important concept when analyzing how much water is moving in a stream at any given moment. “Stage” is the water level above some arbitrary point in the river and is commonly measured in feet. … With modern technology, the USGS can monitor the stage of many streams almost instantly.What is river gage height?
Gage height (also known as stage) is the height of the water in the stream above a reference point. Gage height refers to the elevation of the water surface in the specific pool at the streamgaging station, not along the entire stream. Gage height also does not refer to the depth of the stream.
What is the flow of water called?Streamflow, or channel runoff, is the flow of water in streams, rivers, and other channels, and is a major element of the water cycle.
Article first time published onWhat does bankfull discharge mean?
Bankfull discharge is commonly thought of as the flow that fills the channel up to the top of banks, prior to flooding. For undisturbed, poised streams with wide floodplains, this definition would be correct. … The bankfull discharge is usually exceeded twice every three years.
What is discharge of a watershed?
The discharges of water and other materials that flow off a watershed tell a story about how water interacts with human activities and natural processes on land. Watershed discharges also shape downstream aquatic life by delivering both essential water and nutrients, as well as harmful pollutants.
What are the three stages of river evolution?
These categories are: Youthful, Mature and Old Age. A Rejuvenated River, one with a gradient that is raised by the earth’s movement, can be an old age river that returns to a Youthful State, and which repeats the cycle of stages once again.
What controls river discharge?
The river’s discharge at that location depends on the rainfall on the catchment or drainage area and the inflow or outflow of groundwater to or from the area, stream modifications such as dams and irrigation diversions, as well as evaporation and evapotranspiration from the area’s land and plant surfaces.
What would happen if a stream or river has too much discharge?
Floods occur when the discharge of the stream becomes too high to be accommodated in the normal stream channel. When the discharge becomes too high, the stream widens its channel by overtopping its banks and flooding the low-lying areas surrounding the stream. The areas that become flooded are called floodplains.
What causes river discharge?
1.1 River flow analysis. River discharge is an integrated result of hydrological processes in a river system in transporting runoff from rainfall. … The primary analysis showed that in changing climate, heavy rainfall triggers higher runoff during the wet season causing flooding of low-lying areas.
What are the three types of streams?
- Alluvial Fans. When a stream leaves an area that is relatively steep and enters one that is almost entirely flat, this is called an alluvial fan. …
- Braided Streams. …
- Deltas. …
- Ephemeral Streams. …
- Intermittent Streams. …
- Meandering Streams. …
- Perennial Streams. …
- Straight Channel Streams.
How are streams formed?
Streams need two things to exist: gravity and water. When precipitation falls onto the ground, some water trickles into groundwater, but much of it flows downhill across the surface as runoff and collects into streams.
What is the relationship between stream discharge and basin area?
Each stream in a drainage system drains a certain area, called a drainage basin. In a single drainage basin, all water falling in the basin drains into the same stream.
What is a stream profile?
Stream profile · includes the point of origin of the stream called the head, the point of termination called the mouth, and a decreasing gradient of the stream channel towards the mouth—examples of the mouth of the stream are the juncture of the stream and: another stream; a pond or lake; the ocean.
How does stream discharge change from high gradient to low gradient streams?
High-gradient streams can result in downward erosion, or downcutting. This makes steep, straight valleys with little or no floodplains. On the other hand, low- gradient streams wear land away both sideways and downward. … The width of the valleys increases as discharge increases.
What is the source of a stream called?
The source is known as the headwaters or the head of the stream. A stream may have more than one sources and when two streams come together it’s called a confluence. The smaller of the two streams is a tributary of the larger stream. A stream may create a pool where water slows and becomes deeper.
What is stream flow measurement?
Streamflow is the volumetric discharge expressed in volume per unit time (typically cubic feet per second (ft3/s) or cubic meters per second (m3/s)) that takes place in a stream or channel and varies in time and space.
What is discharge hydrograph?
A hydrograph is a graph showing the rate of flow (discharge) versus time past a specific point in a river, channel, or conduit carrying flow. The rate of flow is typically expressed in cubic meters or cubic feet per second (cms or cfs).
What is the relationship between stream discharge and stream stage?
The stage-discharge relation depends upon the shape, size, slope, and roughness of the channel at the streamgage and is different for every streamgage. The development of an accurate stage-discharge relation requires numerous discharge measurements at all ranges of stage and streamflow.
Why does discharge in a stream usually increase downstream quizlet?
Why does the velocity of a stream generally increase downstream even though the gradient decreases? Velocity generally increases downstream because channels are generally smoother downstream and because stream volume tends to increase as more tributaries enter downstream.
Where is groundwater discharge?
Under natural conditions, ground water moves along flow paths from areas of recharge to areas of discharge at springs or along streams, lakes, and wetlands. Discharge also occurs as seepage to bays or the ocean in coastal areas, and as transpiration by plants whose roots extend to near the water table.
What is groundwater water cycle?
Groundwater is a part of the natural water cycle (check out our interactive water cycle diagram). Some part of the precipitation that lands on the ground surface infiltrates into the subsurface. … Water in the saturated groundwater system moves slowly and may eventually discharge into streams, lakes, and oceans.
What are the two types of fluid flow?
Fluid flow is generally broken down into two different types of flows, laminar flow and turbulent flow. Laminar flow is fluid motion in which all the particles in the fluid are moving in a straight line.
What is bank full?
Bankfull: The water level, or stage, at which a stream, river or lake is at the top of its banks and any further rise would result in water moving into the flood plain.
How do you identify Bankfull?
- Floodplains. …
- Highest active depositional feature. …
- Slope breaks or change in particle size distribution. …
- Evidence of an inundation feature such as small benches.
- Staining of rocks.
- Exposed root hairs below an intact soil layer indicating exposure to erosive flow.
