[GRASSLIST:1076] Curve Lines for Hydrology

GRASS GRASS user
1

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.

Thanks
Johnny Duke

2

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