HydroCAD v10.20-8a: Comprehensive Stormwater Modeling Software

HydroCAD v10.20-8a is a powerful stormwater modeling system developed by HydroCAD Software Solutions LLC, designed for hydrology and hydraulics analysis. Used by engineers since 1986, it provides comprehensive tools for rainfall-runoff simulation, detention pond design, and stormwater management system analysis .

Key Features

Modeling Capabilities

• Complete Stormwater System Analysis: Simulate entire drainage networks including subcatchments, ponds, reaches, and channels

• Multiple Runoff Methodologies: SCS TR-20/TR-55, SBUH, Rational Method, and Unit Hydrograph methods

• Pond and Storage Design: Model detention ponds, retention basins, underground chambers, parking lot storage, and bioretention areas

• Pipe and Channel Flow: Various options for modeling conveyance systems depending on their role

Core Components

Subcatchments

• Simulate rainfall runoff from all surface areas including rooftops, pavements, and pond surfaces

• Flexible number of subcatchments based on routing complexity, not directly tied to land area

• Curve Number 98 commonly used for impervious surfaces like roofs and pavement

Ponds

• Used for any area that will detain water including detention ponds, parking lot flooding, and underground chambers

• Stage-storage characteristics defined using surface areas at multiple elevations

• Stage-discharge curves modeled with standard outlet devices (horizontal orifices, grates, weirs)

• Catch basins can be modeled as ponds with zero storage to analyze outlet control devices