Addition of a Vulnerability Component to the Flash Flood Potential

ions Index = 10 ∗ 1.28 − (0.15 C + LC) 1.28 Where C is the ratio of canopy cover and LC is the land cover soil surface abstraction, determined from Table 2. Imperviousness also is mapped to an index using a linear relationship, as expressed by the following equation: Imperviousness Index = 10 ∗ I Where I is the imperviousness, expressed as a ratio. For example, 50% imperviousness would be stored in “I” as 0.5, which would yield an Imperviousness Index value of 5.