calculate_dlink         Calculate the D-LINK value (downstream reach
                        order)
calculate_link_magnitude
                        Calculate Link Magnitude (Shreve order) for a
                        stream network
calculate_outlet_distance
                        Calculate the accumulated distance to the
                        outlet
create_network_graph    Create a directed graph from a stream network
create_stream_network   Create a directed graph from stream reaches
write_network_with_orders
                        Write a spatial vector with stream order
                        columns
