Streamline routing through fracture junctions

A series of laboratory tests was conducted to determine routing criteria for streamlines through fracture junctions. These tests showed that two criteria are all that is necessary to route streamlines through any two‐dimensional junction under laminar flow conditions. These criteria are (1) that streamlines do not cross and (2) that flow along adjacent streamlines must be in the same direction. Using these two criteria, a unique distribution of streamlines can be determined for both continuous and discontinuous fracture junctions.