Software:HEC-1
From HandWiki
HEC-1 is software that was developed by the US Army Corps of Engineers[1] to estimate river flows as a result of rainfall. It was written in the FORTRAN language and until 1984 could only be run on a mainframe computer.
When desktop computers became popular the program was ported to the PC.[2] Engineers and scientists still use it today because of its ability to model a wide range of natural hydrologic systems.[citation needed]
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