The effectiveness of stormwater management programs depends largely on how well and how safely stormwater control measures (SCMs) perform over time. The importance of maintenance and the significant numbers of SCMs have created the need for guidance on how stormwater programs must adapt to address evolving SCM design and maintenance requirements, climate change and resilience, and integration of asset management concepts to reduce long-term program costs. This manual meets that need with best practices for maintenance programs, as well as case studies to show how a variety of utilities have implemented them. The material covered will be of particular use to designers of SCMs, utility managers, and O&M staff.