The Autodesk® Storm and Sanitary Analysis 2011 Extension is a comprehensive, hydrodynamic hydrology and hydraulic analysis application for planning and designing urban drainage systems, storm sewers including highway drainage systems, and sanitary sewers.

With this extension, engineers and planners using AutoCAD® Civil 3D® 2011 and/or AutoCAD® Map 3D 2011 software can analyze both simple and complex networks including:

• Inlets and catch basins
• Detention ponds and outlet structures
• Interconnected ponds
• Flow dividers, standpipes, weirs, and orifices
• Pumps and lift stations
• Manholes and junctions
• Rivers, streams, and ditches
• Culverts and bridges

Some of the key features and benefits of the Autodesk Storm and Sanitary Analysis 2011 Extension are:

• Bi-directional exchange of data with AutoCAD Map 3D and AutoCAD Civil 3D
• No limitation on the number of pipes or elements you can include in your model
• Widely-accepted SWMM analysis engine
• Broad range of hydrologic methods
• Stormwater BMPs
• Detention pond design
• Stormwater quality modeling
• Customizable report generation for regulatory review
• GIS interoperability
• Work in either US or Metric (SI) units

Content is available in English only.

1. Hydraflow Storm Sewer File import and export   This provides a level of interoperability with your current Hydraflow models, and with AutoCAD Civil 3d.   The Import and Export to STM commands will provide the Stand-alone product the ability to build projects in Storm and Sanitary Analysis (SSA for short)  and return the final design back to the Civil Information Model.  The help file contains the Import and Export Assumptions, so please check out page 478 in the User Guide.    Actually, please read the whole document.   Well, not all at once.
2. EPA SWMM version 5.0.018 One of the engines running this is the EPA SWMM engine. So far, this is the latest engine from the EPA.   This also means that this can import SWMM and Export SWMM models, including XPSWMM models.
3. Multiple Storm Analysis  If you have every needed to analyze more than one distribution or return period, SSA now has the ability to define different storms and batch process the analysis.
4. No limit beyond patience and hardware  The news this year is the 64bit AutoCAD Civil 3d which allows users to build a much bigger model.   As with many Hydrology and Hydraulic programs, they come with hard coded limits or license limits that make unlimited pipes and nodes too expensive.   The only issue might be the 32bit program, but running a multi-year simulation works.  Hey, this is a subscription bonus that has its only requirement being a subscription customer and an installation of AutoCAD Civil 3d or Map 2011. 
5. Inlets   The inlets are a star of the show in my humble opinion.  While this is not entirely new in the program, I just love it.  With Neenah, some Caltrans inlet structures, plus the FHWA inlets built in, this goes beyond anything else!  East Jordan,  US Foundry, let’s get your stuff in this product.  Join the BIM CIM revolution!
6. Reporting  I really like the reporting ability in the product.  We can export the simple EPA SWMM formatted results, prepare Excel worksheets, Custom PDF documents, animations, graphs, and profiles.
7. No separate pipe sizing and Hydrology running analysis  In many cases today, pipes and inlets are typically sized for the 10-year storm return event,   Channels sized to carry a 50-year return flow, and storm water detention ponds sized for say a 2-year and 100-year volume.   This requires different methods with different programs, a spreadsheet for inlets, or hand-calculations for overflow route to solve the entire hydraulic system in discrete parts.    There isn’t a single model capable of modeling all of the elements all at once – until now and its easy to use!