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This document presents fundamental principles of storm sewer design, focusing on the Rational Method applied to composite areas. It includes detailed calculations and examples for determining inlet time and flow time. Example 1 demonstrates the application of the Rational Method in a typical composite area, highlighting key calculations and considerations. Example 2 provides further insights with a different scenario, emphasizing practical applications in urban stormwater management. This guide is essential for engineers and designers in effective stormwater system planning.
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