ion needed to
model the covariance between flow-connected (i.e. water flows
from one location to the other) and flow-unconnected (i.e. water
does not flow from one location to the other, but they reside on
the same network) locations differs. The total hydrologic
distance is a directionless measure; it represents the hydrologic
distance between two sites, ignoring flow direction. The
hydrologic distance from each site to a common downstream stream
junction is used when creating models for flow-unconnected p