Lengths of network - specifically rivers

[N R A]

Can anyone suggest a method by which I can determine the maximum stream 
length in a catchment.

Our hydrology modelling team want to produce FSR reports. This requires 
various bits of catchment characteristics data. Some can be obtained from 
raster datasets - thanks again to all who helped on the 'averaging' 
problem.

The remaining two bits of data are the 'main stream length' and the 'main 
stream slope'. I have chatted with the team about what is meant by the 
'main stream' and they'd be happy to take the longest stream.

Now I've loaded our digital river network into GRASS. Is there some means 
to calculate the longest vector from a specified point. I noticed the 
'v.report' command but it just seems produce a breakdown by category.

Thanks again - as usual  8-)

Steve Culshaw
NRA North West
e-mail : nra at cix.compulink.co.uk (use this for general usage)
or         sculshaw at cix.compulink.co.uk (Private - only checked at best 
biweekly)