Designing a comprehensive municipal sewerage network involves accurately estimating two distinct flow components: dry weather flow (sanitary sewage) and wet weather flow (storm water runoff). Sanitary sewage generation is directly linked to municipal water supply, generally estimated assuming that 75% to 80% of the total water consumed reaches the sewer system. To accommodate diurnal variations, engineers apply a peak factor (typically between 2.0 and 3.0, inversely proportional to the contributing population) to the average dry weather flow. Storm water runoff estimation requires evaluating catchment hydrology. The peak discharge generated by rainfall over an urban catchment is predominantly calculated using the Rational Method : $$Q = \frac{C \cdot I \cdot A}{360}$$ Where $Q$ is the peak storm water runoff in cubic meters per second ($\text{m}^3/\text{s}$), $C$ is the dimensionless runoff coefficient representing the surface impermeability, $I$ is the rainfall intensity in mil...