I was under the impression that SWMMTools is a downloadable ArcView Extension from the ESRI's ArcScripts page. If you have the Spatial Analyst Extension, the slopes can be calculated from ESRI's Hydro extension which is free and downloadable. Dr. Maidment's GISHydro page (http://www.crwr.utexas.edu/gis/gishyd98/GisHyd98.htm) also provides a utility called PrePro for DEM-based terrain analysis. Finally, you might want to try COE's Geo-HECHMS ArcView 3.x extension at http://www.hec.usace.army.mil/softwa...s-geohms.html.

Remember, most of the above Avenue scripts or extensions work with ArcView 3.x only. Avenue programs do not work in ArcGIS 8.x and ArcView 8.x which require VBA scripts.

Sam
ShamsiU@USFilter.com