The current NWM 2.1 Lake Out files have additional fields for "reservoir_type" and "reservoir_assimilated_value". These values are also needed for NWM 3.0. These values do not affect anything in the model and are only for output purposes to assist the user in evaluating Hybrid and RFC type reservoirs. These values are dynamic and output from Hybrid and RFC type reservoirs at every timestep.

Examples of the areas that these need to be added:

https://github.com/NOAA-OWP/t-route/blob/master/src/python_routing_v02/troute/routing/fast_reach/mc_reach.pyx#L1315

https://github.com/NOAA-OWP/t-route/blob/master/src/python_framework_v02/troute/network/reservoirs/hybrid/hybrid.pyx#L137

https://github.com/NOAA-OWP/t-route/blob/master/src/python_framework_v02/troute/network/reservoirs/hybrid/hybrid_structs.c#L94

@jdmattern-noaa will make these additions.

@mehdire61 for potential further correspondence on this too.