For small catchments (typically under $50\text{ km}^2),$ the peak surface runoff discharge $(Q_p)$ resulting from a uniform rainfall event is estimated using the Rational Method: $Q_p = 0.278 \cdot C \cdot I \cdot A$ Where $Q_p$ is peak flow $(\text{m}^3/\text{s}),$ $C$ is runoff coefficient, $I$ is rainfall intensity $(\text{mm/h}),$ and $A$ is catchment area $(\text{km}^2).$ The critical storm duration occurs when rainfall duration equals the catchment's Time of Concentration $(t_c).$ According to Kirpich’s Equation, $t_c$ (in minutes) is evaluated from physical basin geometry: $t_c = 0.01947 \cdot L^{0.77} \cdot S^{-0.385}$ Where $L$ is maximum flow path length (meters) and $S$ is main channel slope $(\text{m/m}).$ Applying static runoff coefficients $(C)$ in rapidly urbanizing Indian watersheds leads to significant underestimation of peak discharges, causing urban flash flooding. Modern urban hydrology workflows dynamically update C values by overlaying GIS high-resolution...