The time step is variable but typically we use one day. Spawning and redd incubation occurs at a segment scale, with one model opened for each segment that is a major spawning site. Habitat within each spawning model is depicted using one-dimensional reaches about 1 km in length. The number and location of spawning models included in a simulation is determined at run time from the input files. A daily time step is usually used.
Juvenile rearing and smolting is simulated at the watershed scale, as juveniles migrate downstream.
A daily time step is usually used. Ocean fish are currently modeled non-spatially, assuming conditions are uniform in the ocean. The ocean life stage model runs on a 30-day time step. Implementing this multi-modeling approach required significant changes from the Swarm modeling conventions. Multiple life stage submodels in the chinook model.