From Haestad Methods web site:

SewerCAD is the most advanced design, analysis, and planning tool, handling both pressurized force mains and gravity hydraulics with ease. SewerCAD leads the market hands-down with features such as steady-state analysis using various standard peaking factors, extended-period simulations of complete collection systems, and advanced automatic system design. SewerCAD’s easy-to-use interface allows you to spend time engineering improved sewer designs instead of wasting your time learning software!

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Cost effective solutions for complex modeling problems:

• Gravity Collection
• Pressure Piping (Forcemains)
• Automated Design
• Flexible Loading
• Infiltration and Inflow
• Scenario Management
• AutoCAD or Stand-Alone
• GIS, SCADA, and Database Links
• Construction Drawings
• Report-Ready Output

For more information see SewerCAD web page.