Strahler Numbered Rivers
![kathorus](https://forum.profantasy.com/uploads/userpics/119/nOTQ34UYPMQ6M.png)
While checking out some programming articles, I came across a link to an article on the Strahler Number - https://en.wikipedia.org/wiki/Strahler_number
I immediately made the connection to my map-making hobby. I learned awhile ago about mapping good rivers, start small, work your way up, etc... but this seemed to gel in a technical sense with me.
Basically, two streams of the same size (1) make a stream of a larger size (2), but two streams of different sizes make the size of the larger one.
So,
Same Size = 1+1 = 2, 2+2 = 3, 3+3 = 4, etc...
Diff Size = 1+2 = 2, 2+4 = 4, etc....
How you can use this info is to determine a good starting width for you source rivers, make a tool for it called "River 1" from the 'default' river style, specify the width and make it a distinct color, for each new size make a new tool and double the size, do this until you reach the mouth. This way you have a quick visual of the sizes of the rivers. When you're happy with the system, convert the colors into the appropriate "Water" style for your map.
Outline Form
![Strahler Number Outline photo Strahler Example.jpg](http://i1180.photobucket.com/albums/x406/bguinan/Strahler%20Example.jpg)
Map Form
I immediately made the connection to my map-making hobby. I learned awhile ago about mapping good rivers, start small, work your way up, etc... but this seemed to gel in a technical sense with me.
Basically, two streams of the same size (1) make a stream of a larger size (2), but two streams of different sizes make the size of the larger one.
So,
Same Size = 1+1 = 2, 2+2 = 3, 3+3 = 4, etc...
Diff Size = 1+2 = 2, 2+4 = 4, etc....
How you can use this info is to determine a good starting width for you source rivers, make a tool for it called "River 1" from the 'default' river style, specify the width and make it a distinct color, for each new size make a new tool and double the size, do this until you reach the mouth. This way you have a quick visual of the sizes of the rivers. When you're happy with the system, convert the colors into the appropriate "Water" style for your map.
Outline Form
![Strahler Number Outline photo Strahler Example.jpg](http://i1180.photobucket.com/albums/x406/bguinan/Strahler%20Example.jpg)
Map Form
![Strahler Number Rivers photo Strahler Example 2.jpg](http://i1180.photobucket.com/albums/x406/bguinan/Strahler%20Example%202.jpg)
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