Graphical HEC-1 download

Perform flood hydrology calculations, from precipitation to runoff to routing
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Download from the developer's website

Alternative software

HEC-RAS
HEC-RAS
Free
rating

River Analysis System (RAS) to perform water flow analysis and computations.

HEC-HMS
HEC-HMS
Free
rating

Simulates the complete hydrologic processes of dendritic watershed systems.

HEC-FDA
HEC-FDA
Free
rating

It can perform an integrated hydrologic engineering and economic analysis.

HEC-GridUtil
HEC-GridUtil
Free
rating

It is designed to provide analysis capabilities for gridded data sets.

MIDUSS
MIDUSS
rating

A Windows-based software that helps you to engineer complex drainage networks