drainage coupling type is set to free weir even though there is no flow

[lrntct]

id	cat	node_id	node_type	coupling_type	coupling_flow	inflow	outflow	lateral_inflow	losses	overflow	depth	head	crest_elevation	invert_elevation	initial_depth	full_depth	surcharge_depth	ponding_area	volume	full_volume	sim_time
34	2	J1	junction	coupled, free weir	0.0	1.45338368945573	0.439266846261155	0.0	0.0	0.0	0.298854480552375	29.7588544805524	31.46	29.46	0.0	2.0	100.0	1.0	0.0	2.0	PT120.0S

[lrntct]

In the table, head < crest_elevation, so for it to be free weir, node head < WSE. Since crest_elevation is set to the DEM internally, even a micrometer of water on the ground will be enough to trigger the free weir equation.