[GRASSLIST:1078] Re: Curve Lines for Hydrology

[Markus Neteler]

Hi Johnny,

On Fri, Nov 03, 2000 at 08:08:40AM -0600, Johnny Duke wrote:
> Does anyone have a script to figure weighted curve numbers for
> watersheds.
> 
> I have a request to do:
> curve numbers for each polygon based on soils and land use.
> 
> weighted  =A,CN+A2CN2+....+AnCNn
>   CN       _____________________
>                Area Watershed
> 
> 
> Where  A1= Area subpolygon 1
>        An= Area subpolygon n
> 
> Area Watershed = A1+A2+A3+.....+An
> 
> Weighted  = Weighted Average
>   CN         CN for whole Watershed Area
> 
> There will be three layers watershed soils and land use.

Did you try
r.weighted.cn?
http://www.geog.uni-hannover.de/grass/gdp/html_grass5/html/r.weighted.cn.html

I am not sure if it is what you want.

Yours

 Markus