Tedds System Calculation - MWH CSO Designer 1.4

Tedds System Calculation – MWH CSO Designer is a custom Tedds calculation by developer Andy Arnison that helps water and wastewater engineers size, check, and document combined sewer overflow (CSO) structures. It guides users through entering catchment and inflow data, design storms, and site constraints; performs hydraulic checks for weirs, orifices, screens, and storage/bypass arrangements; and summarizes performance against user-defined targets such as spill frequency, discharge limits, and freeboard. The output is a clear, step-by-step calculation sheet with units, equations, and intermediate results for transparent review and audit.

Key features:

• Works within the Tedds environment with consistent input prompts and editable assumptions
• Supports multiple design scenarios and sensitivity testing
• Calculates peak flows, volumes, headloss, surcharge checks, and overflow activation levels
• User-configurable safety factors, units, and design criteria
• Generates formatted reports suitable for peer review and submittals
• Built-in validation and range checks to reduce input errors
• Traceable methodology to support quality assurance and regulatory submissions

This tool streamlines repetitive CSO design tasks while preserving engineer control and judgment.

Tedds System Calculation - MWH CSO Designer is developed by Andy Arnison. The most popular version of this product among our users is 1.4.