Tool Website: http://www.deq.state.or.us/WQ/TMDLs/tools.htm , http://groups.google.com/group/heat-source--ttools-forum?hl=en
TTools is an ArcGIS extension used to sample geospatial data and assemble high-resolution inputs for the Heat Source model or other water quality analysis.
Developed in Oregon. Used widely by ODEQ across Oregon. Some routines are used in Washington.
Digital elevation model, spatially explicit vegetation or land cover layer, center line, right and left bank polylines
Center line elevations and gradients, channel widths, stream aspect, topographic elevation (deg), and vegetation or land cover samples
Linkage to Other Models
Ttools outputs are used directly by Heat Source
Level of Effort
Creating and formatting the GIS layers required by Ttools is an investment. Ttools itself is simple to use.