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Topic: International Scale of River Difficulty

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	Rapid - Wikipedia, the free encyclopedia
		A rapid is a section of a river where it loses elevation over a relatively short distance (that is, the stream gradient is locally steepened), causing an increase in water flow and (usually) turbulence.
		A rapid is recognized by the river becoming shallower and having rocks exposed above the flow surface.
		International Scale of River Difficulty - for classification of rapids
	en.wikipedia.org /wiki/Rapid (183 words)

	The Addison Scale (Site not responding. Last check: 2007-10-18)
		The 'Addison Scale' is an extension of the existing International Scale of River Difficulty.
		The International Scale serves to compare the difficulty of rapids in a general sense, and provides a more or less agreed-upon standard for reducing the variables of difficulty, danger, and consequences down to a single datum, expressed as a number.
		Difficulty: The first data is simply 'how difficult is the rapid to run', and the scale used goes from I to VI using the same criteria as the International Scale.
	www.chrisj.winisp.net /articles/addison.htm (802 words)

	Whitewater kayaking - Wikipedia, the free encyclopedia
		Whitewater kayaking is the sport of paddling a kayak on a moving body of water, typically a river.
		River Running can be thought of as a tour down a river, to enjoy the scenery as well as experiencing challenging whitewater.
		International Scale of River Difficulty - Whitewater is normally rated on this scale which goes from 1 to 6, normally designated by Roman Numerals.
	en.wikipedia.org /wiki/Whitewater_kayaking (900 words)

	River Rating System
		This is the American version of a rating system used to compare river difficulty throughout the world.
		this system is not exact; rivers do not always fit easily into one category, and regional or individual interpretations may cause misunderstandings.
		river difficulty may change each year due to fluctuations in water level, downed trees, recent floods, geological disturbances, or bad weather.
	www.mtwashingtonvalleypaddlers.org /RapidRatingSystem.htm (682 words)

	Kayaking - Scale of Difficulty - CO, - Citysearch
		It is used to compare the difficulty of different rivers to one another.
		Rivers and rapids do not always fit neatly into a specific class, and rivers are dynamic environments which change from year to year.
		The difficulties of Class V carried to the limits of navigability.
	www.citysearch.com /profile/11362889 (656 words)

	American river rating system - Reedy River Paddling Guide (Site not responding. Last check: 2007-10-18)
		rapids that are at the lower or upper end of this difficulty range are designated "class iii-" or "class iii+" respectively.
		rapids that are at the upper end of this difficulty range are designated "class iv-" or "class iv+" respectively.
		Allow an extra margin of safety between skills and river ratings when the water is cold or if the river itself is remote and inaccessible.
	www.paddlesc.net /river_class_list.asp (844 words)

	New Safety Code
		The river's speed and power increase tremendously as the flow increases, raising the difficulty of most rapids.
		It is often misleading to judge the river level at the put in, since a small rise in a wide, shallow place will be multiplied many times where the river narrows.
		Participants share the responsibility for the conduct of the trip, and each participant is individually responsible for judging his or her own capabilities and for his or her own safety as the trip progresses.
	www.hipittsburgh.org /safety (3625 words)

	Ten Rivers, Heartland Adirondacks Canoe Guide
		The Ten Rivers Region is centered at precisely the point where three great counties meet, on the base of historic Coney Mountain, along the famous Totten and Crossfield boundary line that crosses N.Y. Route 30, known as the Adirondack Trail.
		The Ten Rivers Recreational Area is truly the "Heartland" of the Adirondacks and part of the nation's largest forest preserve this side of Alaska.
		This lake is fed by the Raquette River at the north end and by the Bog River at the south.
	www.tupperlake.net /canoe.htm (4367 words)

	Northeast Paddlers Message Board
		A dynamic river move whereby you maneuver the nose of your boat (facing upstream) into the downstream current which then carries bow deeply under water, elevating the stern up in to the air.
		A depression in the surface topography of the river caused by a submerged or semi-submerged object.
		May cause the river craft to grind against the bottom, but otherwise does not usually represent a serious obstacle to navigation of the river.
	www.npmb.com /cms2/e107_plugins/siteterms_menu/siteterms.php?list (3117 words)

	Ohio DNR Div. of Watercraft: River & Stream Access / River Safety
		River obstructions that allow water to flow through them, but which block or "strain" people and boats, are known as "strainers".
		River warnings and flood information are made available to boaters through public TV and radio, or by contacting any Watercraft office.
		This scale rates rivers on a classification of I to VI in boating difficulty.
	www.dnr.state.oh.us /watercraft/boat/riverlas/riversafety.htm (877 words)

	TPWD; Texas River Guide; River Safety
		During spring conditions or in late fall, the river water is cold, and if you spill you can very quickly be overcome with hypothermia.
		Whenever you are on the river, it is important that you are prepared to deal with an emergency.
		River guide booklets and topography maps are valuable references in trip planning.
	www.tpwd.state.tx.us /landwater/water/habitats/rivers/safety.phtml (2995 words)

	River Information
		Rivers are classified based on the International Scale of River Difficulty.
		The river from I-75 bridge to KY 1956, meanders for 10.6 miles and is considered to be a Class I+ stream.
		This section of river is designated a State Wild River and includes one of the most challenging white water runs in Kentucky.
	www.fs.fed.us /r8/boone/recreation/rivchart.shtml (1108 words)

	River Guide for Chena River State Recreation Area
		The river flows from the Yukon-Tanana Uplands to its confluence with the Tanana River in Fairbanks.
		The Chena River is rated as Class II on the international scale of river difficulty.
		The upper portions of the river are more difficult being narrower with more obstacles, such as log jams, low hanging trees called sweepers, shallow water and sharp turns.
	www.dnr.state.ak.us /parks/units/chena/river.htm (863 words)

	Feathers: Ratings - River
		The whitewater rivers that we paddle are classified by difficulty according to the International Scale of River Difficulty.
		The International Scale of River Difficulty is generally accepted by most national and international organizations as the most nearly objective evaluation of whitewater rivers.
		In addition, a class 4 paddler assesses a given river, river level, and rapid to determine if it can be run with a good margin of safety and sets up appropriate safety measures (throw bags or persons in a safety boat) accordingly.
	www.amc-ny.org /recreational-activities/canoe/feathers/ratings.html (2292 words)

	The Proposed Expanded Class I System of Rating Rivers
		The scale is universally accepted by river runners and outdoor education and ranges from class I to class VI.
		For those who are comfortable with the international scale, it's there, but those who want a finer way of distinguishing between rivers, it's there too.
		The river may be very narrow and have many sharp turns and long stretches of overhanging trees and brush.
	www.isu.edu /outdoor/classone.htm (1637 words)

	American Whitewater -
		This includes an evaluation of the expected difficulty of the rapids under the conditions existing at the time of the put-in.
		The group should have a reasonable knowledge of the difficulty of the run.
		Examples of commonly run rapids that fit each of the classifications are presented in the attached document, "International Scale of River Difficulty - Standard Rated Rapids." Rapids of a difficulty similar to a rapids on this list are rated the same.
	www.americanwhitewater.org /content/Wiki/safety:start (3663 words)

	Kayaking and Canoeing Instruction - Top Whitewater Kayak Schools in North America
		Rivers are rated using roman numerals I to VI.
		I is easy, VI unrunnable, and V extreme--see the International Scale of River Difficulty chart below.
		Because of the large range of difficulty that exists beyond class IV, class V is an open-ended, multiple level scale designated by class 5.0, 5.1, 5.2, etc...
	www.kayakschools.com /river_ratings.html (630 words)

	White water rafting West Virginia, New River Gorge whitewater rafting vacation
		Rivers are classified on the International Scale of River Difficulty.
		Thus, a river with 20 Class III's and only one Class V would be rated a Class V river.
		Western rivers are rated on a scale of 1 to 10...known as the Communist Rating System.
	www.aceraft.com /rapids.html (692 words)

	Pennsylvania Kayak & Whitewater, Tips, Resources and River Information
		Rivers do not always fit easily into one category and there may be regional interpretations.
		Slippery Rock Creek is a Class II to IV river, depending on water level.
		The idea is to paddle the boat into a spot where the river pushes the bow down, thus lifting the stern into the air.
	www.bigdamfish.net /kayak.html (4471 words)

	Rafting /kayaking on the Arkansas River
		The river continues through narrow Brown's Canyon where it flows away from the highway and is adjacent to a railroad.
		Boaters on the Arkansas should be able to assess their own abilities and equipment in the relation to the International Scale of River Difficulty.
		Certainly some sections of the river are more dangerous and challenging than others, but most of the professional outfitters in the area who make their living guiding groups down the river can negotiate the Arkansas during any season and through any water level.
	www.salida.com /html/rafting.htm (2556 words)

	American Canoe Association ACA
		The International Scale of River Rating Difficulty is a guide for assessing the difficulty of a stretch of water.
		Ability to execute a roll is essential for all boaters in kayaks and closed canoes.
		Class VI - Difficulties in Class V carried to the extreme of navigability.
	www.acanet.org /safety/river_scale.lasso (186 words)

	[No title] (Site not responding. Last check: 2007-10-18)
		The American Whitewater Affiliation's International Scale of River Difficulty is a useful tool to determine the severity of sections in a river.
		These guidelines offer a general classification for rivers, but be aware that the system is not exact.
		Rivers do not always fit neatly into the various classifications, and regional interpretations of the classification system may create misunderstandings.
	www.dotzen.org /paddler/cpr/ratings.txt (75 words)

	How to Understand River Rapid Rating Systems - eHow.com
		Learn to properly read the white-water rapid rating system to gauge the difficulty level of the river before embarking upon a rafting trip.
		Realize that there are two different rating systems: the European scale (International Scale of River Difficulty) and the American scale.
		River rafting is an inherently dangerous activity that can result in serious injury or death.
	www.ehow.com /how_9483_understand-river-rapid.html (302 words)

	INTERNATIONAL SCALE OF RIVER DIFFICULTY
		River difficulty may change each year due to fluctuations in water level, downed trees, geological disturbances, or bad weather.
		A very reliable eskimo roll, proper equipment, extensive experience, and practiced rescue skills are essential for survival.
		This class does not represent drops thought to be unrunnable, but may include rapids which are only occasionally run.
	users.aol.com /boatful/ratings.htm (587 words)

	River Class Rating - RaftColorado.net
		Complex maneuvers in fast current and good boat control in tight passages or around ledges are often required; large waves may be present but are easily avoided.
		Drops may contain large, unavoidable waves and holes or steep, congested chutes with complex, demanding routes.
		Class VI: These runs often exemplify the extremes of difficulty, unpredictability and danger.
	www.raftcolorado.net /classrating.php (220 words)

	International Scale of River Difficulty (Site not responding. Last check: 2007-10-18)
		The International Scale of River Difficulty is a rating system designed to provide a benchmark for paddlers to rate rivers.
		It is important to understand that this scale must be applied with caution.
		If the weather is colder than usual, the water is cold, or the river is at a higher than normal level, the river should be classed higher than it's guidebook rating.
	www.kansas.net /~tjhittle/difficul.html (269 words)

	Bristol Canoe Club Magazine (Site not responding. Last check: 2007-10-18)
		A nice warm up type of river with little boily bits to keep the proper kayakers happy, and flat enough to be able to say that I paddled a Scottish river without falling in.
		We arrived back to the house had breakfast and then every one decided to paddle the Awe which is a dam released river so and a good warm up river about grade 3.
		He was in training for his trip around the world canoeing and we still forgot to get his autograph but we did not look up to him quite the same when he stood changing talking to us and waving his underpants in front of our face at the same time.
	www.bristolcanoeclub.org.uk /magazines/zine0008 (5727 words)

	International Scale of River Difficulty
		If that doesn't work, talk to someone in the forestry department and see if you can get some current info on water levels and the category of rapids you'll be facing.
		As you're probably aware, there are several categories of rapids as defined by the International Ratings system.
		Steep drops, strong currents, and a river full of obstructions.
	www.kayakingjournal.com /ISRD.html (589 words)

	Dave's International Scale of River Difficulty (Site not responding. Last check: 2007-10-18)
		Climbing out of river may involve slippery rocks and shrub-induced lacerations.
		Boat is munched against large boulder hard enough to leave series of deep gouges.
		Paddle partners stare slack-jawed and point in amazement at canoe which is finally stopped by major feature.
	www.vanemden.com /humour/swimmer.html (327 words)

	AQUA SHACK
		As one might expect, the difficulty of a particular paddling trip (like the difficulty of any particular dive) is dependant on many factors: discharge rate (on dam controlled rivers), gradient, complexity of rapids, the types amd frequency of obstacles and immidiacy (or difficulty) of rescues are amoung some of the more obvious.
		Any one of these could dominate and make the trip tougher; it is necessary to consider them all.
		However, over the years an international system of of grading rivers or individual rapids, on a scale of I to VI, has evolved to be the most frequently used and is the system used here.
	www.aquashack.com /riverdifficulty.html (375 words)

	International Scale of River Difficulty - Tour West
		International Scale of River Difficulty - Tour West
		Exceedingly difficult: Long, violent rapids with difficult, irregular, unavoidable high waves and holes; extreme obstruction; rescue difficult.
		Limit of navigability: All difficulties increased to the limit; cannot be attempted without risk of life.
	www.twriver.com /river_ratings (100 words)

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