[EKB] WEAP (www.weap21.org/) is the Water Evaluation and Planning system from the Stockholm Environment Institute (SEI, web site: http://www.sei.se). It's a commercial package, but is free for people in developing country institutions. I've been working with it (because I work at SEI!) and have been thinking about how to run WEAP from Tcl/Tk for various purposes. WEAP can act as a COM server, so [tcom] seemed like a good choice. For anyone else who might want to play with this, here's the example from the WEAP API help translated from VBScript into Tcl: package require tcom set weapobj [::tcom::ref createobject "WEAP.WEAPApplication"] $weapobj Verbose 1 $weapobj Logfile [file join [$weapobj Directory] "WeapErrors.txt"] $weapobj ActiveArea "Weaping River Basin" $weapobj ActiveScenario "Supply Measures" for {set GrowthRate 0} {$GrowthRate < 6} {incr GrowthRate} { set varobj [$weapobj BranchVariable {\Demand Sites\South City:Annual Activity Level}] $varobj Expression "Growth($GrowthRate%)" $weapobj LoadFavorite "Groundwater Storage" # Did user cancel? if {[$weapobj Status] eq "FALSE"} { break } $weapobj ExportResults "C:\\GWresults$GrowthRate.csv" FALSE TRUE } ---- [Category Example] | [Category Windows] | [Category Science]