Length of the main stem in a river by summarizing line segments

[Anonymous User]

Original User: ossi88

Hello,

I have a problem with calculating the length of the main river in a network of rivers. I am only interested in the main stem length. Problem is that the river only consists of line segments and many side-rivers I am not interested in. Do I have to calculate this manually by using the "Identify" tool or are there easier options? I am going to use this on many different rivers so I hope there are more efficient ways to sort this out. If so, can you give me a little guide or point me in the right direction?

Help will be appriciated
Thanks

�?ystein

[DanPatterson_Retired]

At least by using the Strahler method of stream ordering and other tools

http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009z000000z3000000.htm
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009z00000057000000.htm
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Stream_to_Feature/009z00000058000000/

it will simplify what you consider to the the main stream channel then you can select the segments and get their length