head_divisor (float, default 1.0) – Divisor applied to each value, to undo the FACTLTOU head-output
scale factor when the model was run with FACTLTOU != 1 (see
iwfm.read_factltou). Default 1.0 leaves values unchanged.
Returns:
gwhyd_sim – 2D array of shape (num_timesteps, num_columns) where
column 0 is datetime and columns 1..N are hydrograph values