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Watershed delineation is the process of identifying and mapping the boundaries of a watershed, which is an area of land where all the surface water drains into a common outlet, such as a river, lake, or ocean. The concept is based on the natural topography of the land, where water flows downhill from higher elevations to lower elevations.
The curve number is a dimensionless value that ranges between 30 and 100. It is based on a variety of factors such as soil type, land use, hydrologic condition, and antecedent moisture conditions. The higher the curve number, the less water can infiltrate into the soil, resulting in higher runoff potential.