where α (unitless) represents the rainfall-run-off coefficient for each waterhole (α = 0.05), P is the spatial mean TRMM rainfall received over the contributing area (watershed of the waterhole), Aws (m2) is the surface area of the watershed and Awh (m2) is the surface area of the waterhole.
This soil loss quantity would be favored by the erosion factors controlling soil loss, such as steep slopes (nearly 40% of the total surface area of the watershed showed a slope value more than 20%), moderately erodible lands (57% of lands showed a K-factor between 0.45 and 0.5), and degraded plant cover.
The Portland Bureau of Environmental Services estimates that one-third of the surface area of the watershed that lies within its jurisdiction is impervious.
By considering the distance value as the height of the three-dimensional surface, the watershed of the surface corresponds to equidistant lines from neighboring white regions and thus a segmentation boundary.
In Cook's original method there was a fourth factor of the extent of surface storage within the watershed, but trials have shown that the method can be simplified by ignoring this factor, without significant loss of its effectiveness.
Thus, at any point in time we can create a mosaic of cells, each with a local model surface wetness, which taken as a whole represents the surface conditions of the entire watershed.
The high fraction of impervious surfaces in the watershed makes it difficult to improve water quality in the creek.
Thirty-four percent of the surface runoff in the watershed is collected from rain, 31 percent from rain on snow, and 35 percent from snowmelt.
Nine percent of the watershed's surface runoff is collected from rain, 35 percent from rain on snow, and 56 percent from snow.
The morphometric characteristics of the watershed control all surface runoff, and due to this condition, the watershed is considered an ideal territorial unit (Lima et al. 2011).
