Which period of the NRCS 24-hour rainfall distribution experiences the highest intensity of rainfall?

The middle stage of the NRCS (Natural Resources Conservation Service) 24-hour rainfall distribution is characterized by the period when rainfall intensity reaches its peak. This distribution model is commonly used in hydrology to estimate peak flow rates and evaluate stormwater management practices.

During the middle stage, the rain typically starts more gently, with a gradual increase in intensity. As the storm progresses, the rainfall reaches its highest levels, reflecting the maximum sustained intensity. This peak intensity is crucial for calculating runoff and designing drainage systems, as it directly impacts how much water will enter the stormwater management system and how quickly.

Understanding the rainfall distribution phases is essential for engineers tasked with flood control or designing infrastructure to manage stormwater efficiently. The final stage typically sees a decrease in intensity, while the initial stage has low intensity, and the constant stage represents a steady but lower intensity, neither of which matches the peak seen in the middle stage.