Information about Rapid
RAPID is an acronym for Rural Address Property IDentification, a scheme instituted in New Zealand to assist emergency services in identifying and locating rural properties.
However, since the adoption of Australian/New Zealand Standard 4819:2003 Geographic Information – Rural and urban addressing in 2003, this scheme is now known as Rural Addressing.
The acronym RAPID has since been applied to a project of the New Zealand Ministry of Civil Defence and Emergency Management, entitled Response And Preparedness In Disasters
A rapid is a section of a river where the river bed has a relatively steep gradient causing an increase in water flow and turbulence. A rapid is a hydrological feature between a run (a smoothly flowing part of a stream) and a cascade. A rapid is characterized by the river becoming shallower and having some rocks exposed above the flow surface. As flowing water splashes over and around the rocks, air bubbles become mixed in with it and portions of the surface acquire a white colour, forming what is called "whitewater". Rapids occur where the bed material is highly resistant to the erosive power of the stream in comparison with the bed downstream of the rapids. Very young streams flowing across solid rock may be rapids for much of their length.
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However, since the adoption of Australian/New Zealand Standard 4819:2003 Geographic Information – Rural and urban addressing in 2003, this scheme is now known as Rural Addressing.
The acronym RAPID has since been applied to a project of the New Zealand Ministry of Civil Defence and Emergency Management, entitled Response And Preparedness In Disasters
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Violent water below Niagara Falls
See also
- Fluid dynamics - for academic explanation.
- International Scale of River Difficulty - for classification of rapids.
- Rheophile - organisms that live in fast flowing water.
- Riffle - A fast moving portion of a stream without the vigour of a rapid
- Whitewater - for factors related to rapids.
References
- Mason, Bill. Path of the Paddle, 1984, Northword Press, Minoqua, WI.
Anthem
"God Defend New Zealand"
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Capital Wellington
Largest city Auckland
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"God Defend New Zealand"
"God Save the Queen" 1
Capital Wellington
Largest city Auckland
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river is a natural waterway that transits water through a landscape from higher to lower elevations. It is an integral component of the water cycle. The water within a river is generally collected from precipitation through surface runoff, groundwater recharge (as seen at baseflow
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Stream gradient is the ratio of drop in a stream per unit distance, usually expressed as feet per mile or meters per kilometer. A high gradient indicates a steep slope and rapid flow of water (ie.
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In fluid dynamics and hydrometry, the volumetric flow rate, also volume flow rate and rate of fluid flow, is the volume of fluid which passes through a given surface per unit time (for example cubic meters per second [m3 s-1
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turbulence or turbulent flow is a flow regime characterized by chaotic, stochastic property changes. This includes low momentum diffusion, high momentum convection, and rapid variation of pressure and velocity in space and time.
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Hydrology (from Greek: Yδωρ, hudōr, "water"; and λόγος, logos, "knowledge") is the study of the movement, distribution, and quality of water throughout the Earth, and thus addresses both the hydrologic cycle and water resources.
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worldwide view.
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A cascade is a waterfall or a series of waterfalls.
Cascade may also refer to:
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Cascade may also refer to:
Places
North America
- Cascade Range, a mountain range on the west coast of North America
Canada
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Balanced Rock stands in Garden of the Gods park in Colorado Springs, CO]] A rock is a naturally occurring aggregate of minerals and/or mineraloids. The Earth's lithosphere is made of rock. In general rocks are of three types, namely, igneous, sedimentary, and metamorphic.
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Whitewater is formed in a rapid, when a river's gradient drops enough to form a bubbly, or aerated and unstable current; the frothy water appears white. The term is also used loosely to refer to less-turbulent but still agitated flows.
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stream bed is the channel bottom of a stream or river or creek; the physical confine of the normal water flow. The lateral confines (channel margins) during all but flood stage are known as the stream banks or river banks.
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Fluid dynamics is the sub-discipline of fluid mechanics dealing with fluids (liquids and gases) in motion. It has several subdisciplines itself, including aerodynamics (the study of gases in motion) and hydrodynamics (the study of liquids in motion).
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The International Scale of River Difficulty is a standardized scale used to rate the safety of a stretch of river, or a single rapid. The grade reflects the technical difficulty, skill level required and danger associated with the section of river.
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A rheophile is an organism that prefers to live in fast moving water.
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Examples of rheophilic animals
Insecta
- Epeorus sylvicola, a rheophilic mayfly species (Ephemeroptera).
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A riffle (also known as a swift) is a shallow stretch of a river or stream, where the current is above the average stream velocity and where the water forms small rippled waves as a result. It often consists of a rocky bed of gravels or other small stones.
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Whitewater is formed in a rapid, when a river's gradient drops enough to form a bubbly, or aerated and unstable current; the frothy water appears white. The term is also used loosely to refer to less-turbulent but still agitated flows.
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