FORM factor: This is defined as the ratio of average width of the basin to the axial lengthForm factor \(\rm = \dfrac{B_{avg}}{L_{axial}}\)Form factor \(\rm=\dfrac{Area}{L× L}\)Calculation:Given:Area of CATCHMENT = 62.5 mm2axial LENGTH of catchment = 10 mmForm factor \(=\dfrac{62.5}{10\times 10}\)∴ Form factor = 0.625