A design study is a top-level grouping of the pipe design and rehabilitation you want to do for one complete design hydraulic model. A design study should be used to represent a real hydraulic model unit, such as a system expansion, main replacement, system augmentation, etc. For different or unrelated projects-such as a main replacement hydraulic model and a hydraulic model to design a new service area-you should use different, new design studies.

To start using Darwin Designer, you must first create a design study. All Darwin Designer data exists within design studies.

A design study includes the following:

1. A description of the events that serve as the basis for design.
2. A set of pipes being sized or rehabilitated.
3. Constraints you must meet, which are defined in a design event.
4. A range of design sizes or rehabilitation options.
5. Cost data for use in the optimization.
6. Genetic algorithm options.
7. A number of design runs to test the design.
8. The results of design runs.

It is apparent that one or more of these items will be different between different design studies, hence the ability to create as many design studies as you need.

You can create more than one design study. Each design study can include one or more design runs. Each design run is manual or optimized. The particular events and groups are specified by making them active. You may create many design runs within a design study.

In the design study, create the groups of pipes for design and rehabilitation, define the design/rehab options (costs and sizes, etc.), and define constraints and parameters for your designs. These items get used in the design runs and the computations that produce your design results.

• New: Clicking New opens a submenu containing the following commands:
  • New Designer Study - More than one design study can be added and design studies are not related.
  • New Optimized Design Run - Add an optimized design run. Optimized design runs use a genetic algorithm.
  • New Manual Design Run - Add a manual design run for specific solution alternatives for trial-and-error calculations.
• Delete: Click to delete the selected design study.
• Rename: Click to change the name of the selected design study.
• Compute: Click to compute the run.
• Export to Scenario: Click to export your results as an alternative to your scenario. Export creates a new scenario and then can export the following data to alternatives:
  • Physical Alternative data: diameter, roughness, and material.
  • Active Topology Alternative: If the pipe diameter is 0, the pipe is made inactive in the active topology alternative.
• Report: Click to present the data in the Report Viewer.
• Graph: Click to display a graph of the results.
• Help: Click to open the online help.