# Black diamond

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'''[[Black diamond]]''', '''Difficult''' Amongst the most difficult at a given mountain. '''[[Black Diamond]]''' trails tend to be steep (typically 40% and up) and may or may not be groomed, though the introduction of '''[[snowcat|winch-cats]]''' has made the grooming of steep slopes both possible and more frequent. | '''[[Black diamond]]''', '''Difficult''' Amongst the most difficult at a given mountain. '''[[Black Diamond]]''' trails tend to be steep (typically 40% and up) and may or may not be groomed, though the introduction of '''[[snowcat|winch-cats]]''' has made the grooming of steep slopes both possible and more frequent. | ||

+ | == '''Slope Steepness''' == | ||

+ | [[Image:Grades degrees.png|There are two ways of measuring slope steepness. The first is a measurement using '''[[degrees]]''', which measures the angle of the slope in degrees from the horizontal. The second is a percentage.|thumb|200px]] | ||

+ | There are two ways of measuring slope steepness. The first is a measurement using '''[[degrees]]''', which measures the angle of the slope in degrees from the horizontal. The second is a percentage. | ||

+ | |||

+ | This is calculated using the formula 100*rise/run. Rise is the vertical change and run is the horizontal distance. A 100% slope is angled at 45 degrees. | ||

+ | |||

+ | *10% is equivalent to 5.71º | ||

+ | *20% is equivalent to 11.31º | ||

+ | *30% is equivalent to 16.7º | ||

+ | *40% is equivalent to 21.8º | ||

+ | *50% is equivalent to 25.67º | ||

+ | *75% is equivalent to 36.8º | ||

+ | *100% is equivalent to 45º | ||

+ | |||

+ | A beginner slope is typically between 6% and 25%. Intermediate hills range from 25% to 40%, and expert is 40% plus. | ||

== '''Also see''' == | == '''Also see''' == | ||

+ | *'''[[Green circle]]''' | ||

+ | *'''[[Blue Square]]''' | ||

+ | *'''[[Black diamond]]''' | ||

+ | *'''[[Double black diamond]]''' | ||

+ | *'''[[Skier Rider Ability Level]]''' | ||

*'''[[Slope]]''' | *'''[[Slope]]''' | ||

*'''[[Grade]]''' | *'''[[Grade]]''' |

## Current revision

** Black diamond**,

**Difficult**Amongst the most difficult at a given mountain.

**Black Diamond**trails tend to be steep (typically 40% and up) and may or may not be groomed, though the introduction of

**winch-cats**has made the grooming of steep slopes both possible and more frequent.

## [edit] **Slope Steepness**

There are two ways of measuring slope steepness. The first is a measurement using **degrees**, which measures the angle of the slope in degrees from the horizontal. The second is a percentage.

This is calculated using the formula 100*rise/run. Rise is the vertical change and run is the horizontal distance. A 100% slope is angled at 45 degrees.

- 10% is equivalent to 5.71º
- 20% is equivalent to 11.31º
- 30% is equivalent to 16.7º
- 40% is equivalent to 21.8º
- 50% is equivalent to 25.67º
- 75% is equivalent to 36.8º
- 100% is equivalent to 45º

A beginner slope is typically between 6% and 25%. Intermediate hills range from 25% to 40%, and expert is 40% plus.

## [edit] **Also see**

**Green circle****Blue Square****Black diamond****Double black diamond****Skier Rider Ability Level****Slope****Grade****Inclinometer****Mountain****Degree****Average Grade****Trail System****Average Grade****Average Width****Mountain master planning process****Maximum Grade****Ski resort**

## [edit] **Reference**

- Wikipedia
*Ski trail ratings*[1]

Return to **Trail designation system**, **Ski lift**, **Ski Related Definitions**, **Freestyle Equipment Rules**, **General Definitions** or **Freestyle Skiing**