This is primarily an engineering decision that you'll need to make, using HAMMER to assist you. Your design requirements may be different from other users depending on your region, local standards, type of project, sensitivity of the system, type of transient event, etc. This may drive the constraints as far as acceptable range of pressures and whether some amount of vapor is acceptable. You may need to check with your reviewer. Generally speaking, the "Hydraulic Grade and Air/Vapor Volume" Graph Type in the Profiles tab of the Transient Results Viewer is usually a good start for seeing the most important factors - the transient "envelope" (min and max HGL) and vapor/air volume (shown at the top). The profile will need to cover the area of interest (you may need more than one) and some additional checks on areas not included in those profiles may need to be done after an initial mitigation strategy has been identified. Once you know the factors that effect your transient mitigation design, you can use HAMMER's tools such as scenarios and alternatives to investigate mitigation approaches. For additional guidance, you may want to check out Chapter 13 of our Advanced Water Distribution Modeling and Management book , which covers theory and practice of transient modeling. You can also use the search bar at the top of the Hydraulics and Hydrology community to find other discussions on transient modeling approaches.
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