What is the definition of "normal rainfall" used for buffer purposes?

The definition of "normal rainfall" used for buffer purposes refers to the 30-year average rainfall computed at the end of each decade. This long-term average is considered more stable and reliable for various applications, such as agricultural planning, water resource management, and climate studies. By using a 30-year period, it minimizes the impact of anomalous weather events and provides a more comprehensive understanding of typical climatic conditions.

This method effectively smooths out variations that might occur in shorter timeframes, ensuring that the assessment of normal rainfall reflects a consistent baseline that can be utilized to prepare for variations in weather patterns. Utilizing longer averages helps stakeholders make informed decisions about resource allocation and risk management related to rainfall variability.