Topographic Index
	§ a / sin b l (Beven and Kirkby 1979) l a represents a grid cell’s upslope contributing area per contour length l sin b is the local slope of the grid cell § The index calculates drainage area and the ability of the landscape to accommodate hydrologic flow l The index defines potential areas of high saturation and runoff l The topographic index serves as the basis for many hydrologic models