Stream slope calculation

[spencersawaske]

Hi,

I was wondering if anyone has experience calculating stream gradients?  I've got both archydro derived drainagelines and nhd streamlines to work with but am unable to figure out how to calculate 1) stream gradient at watershed outlets and 2) if possible streamslope at some give interval throughout my basins.

thanks for any information,
spencer

[sanjaykhadka]

Hi,
Did you find the answer of your question? I am also having same problem. I want to calculate the slope from each pixel to the outlet cell. but Arcgis just calculates the slope of neighboring cells. If you have found or have any idea please reply!

Regards
Sanjay

[MattMead]

Sanjay,
I assume you want stream distance and not linear distance from point to outlet point right?  If so, you could use EZ profiler (http://arcscripts.esri.com/details.asp?dbid=16031) to create points along your stream(either every X map units or total number of points) and use "Arctoolbox->conversion tools->To Raster->point to raster" and set the cell values to the Distance attribute stored in the point. 

Using Raster Calculator in Spatial Analyst you can then calculate the slope per cell.

SlopeRast=([DEM]-OutletElevation)/[PointRast]

That should do it assuming A) you have your terrain as a DEM/Raster file B) the outlet point in your profile is at Distance=0