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Set Flow Direction

This is a special purpose tool used to auto-populate a flow direction field of a manhole layer to match the flow direction of the sewer lines that intersect each manhole.  This process updates every manhole on the layer you select.  This analysis assumes that your sewer lines layer was drawn with flow direction in mind, meaning, each sewer line was drawn starting at the up-stream end and ending at the down-stream end.  Use the arrow line style to illustrate this direction.  The direction field of your manhole layer will be populated with one of 8 values including North, South, East, West, Northeast, Southeast, Southwest, or Northwest and it is based on the direction of the line found to be exiting the manhole.  If multiple lines are drawn as exiting the manhole then the first one found will be used to determine direction.