What is a parameter that is utilized in determining runoff based on soil characteristics and land use?

The runoff curve number (CN) is a crucial parameter used in hydrology to estimate runoff from a given rainfall event, considering both soil characteristics and land use. The CN method integrates these factors into a single number that reflects the potential for runoff based on the land's conditions.

The CN is specifically designed to account for various land uses, such as urban versus rural areas, and the type of soil present, allowing for a tailored approach to predict how different environments will respond to rainfall. The parameter ranges from 0 to 100, where lower values indicate less runoff potential (with high infiltration capability) and higher values indicate greater runoff potential (with low infiltration capability).

Using the CN is essential when developing stormwater management practices, as it helps engineers and planners design systems that adequately handle the expected runoff volumes, protecting both the built environment and natural waterways from flooding and pollution.