Tennessee Conflation Issues

Feature Classification Conflation of ReachCodes Stopping at state edge NHDStatus table NHDProccessingParameter table

A Stream goes under a road the Ftype is Undergound Conduit

The red is underground Conduit

On the Topo map a Stream ends at a depression

They called it a Conector

They coded all Streams perennial because the NHD 24K looked like this

24K NHDAfter Conflation Conflation problems They do not have any 1p or p1 in the ReachCrossReference table

All the new ReachCodes are negative

They Stopped Conflation at the State Boundary

The black ReachCodes are NHD and the blue ReachCodes are Tennessee Conflated ReachCodes

The black ReachCodes are NHD and the blue ReachCodes are Tennessee Conflated ReachCodes

All These features need to be added to the NHDStatus table as Modify Geometry