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Surface Watersheds
Topics in this section
- About Surface Watersheds
Use watersheds to analyze how water flows along and off of a surface. - About Boundary Point Watersheds
If the downhill end of a channel edge is on the surface boundary, then water flowing through that channel continues off the surface. The boundary point is the lowest end of the channel. - About Boundary Segment Watersheds
If an edge on the surface boundary belongs to a triangle that slopes down toward that edge, then water flows off the surface all along that edge. A boundary segment is a connected sequence of such edges. - About Depression Watersheds
If a point is at a lower elevation than all its neighboring TIN points, then when water flows to it, it has no downhill place to go. Similarly, a connected set of points that are at the same elevation and all of whose neighbors are at a higher elevation, is a single drain target. A depression is any such set of points. - About Flat Area Watersheds
A flat area watershed is a flat area, from which water could flow down to more than one drain target. It also includes the parts of the surface that drain to that flat area. A flat area is a connected set of triangles all of whose vertices have the same elevation. Flat areas abut parts of the surface that slopes downhill. - About Multi-Drain Watersheds
One type of ambiguous watershed is called a multi-drain or split channel watershed. - About Multi-Drain Notch Watersheds
A multi-drain notch watershed occurs where there is a flat edge between two points on a surface. - To Generate and Display Watersheds
- To View Watershed Properties
Parent topic: Surfaces