The Deep Green (DG) power plant which is based on a tethered kite model aims to operate efficiently in tidal current velocities as low as 1.2 m/s. In a previous project, numerical modelling of the Deep Green in a tidal flow was carried out using Large Eddy Simulations (LES) and Actuator Line Method (ALM) implemented in the OpenFOAM solver. In this study, results from the numerical model have been compared to Acoustic Doppler Current Profiler (ADCP) observations taken in the wake of a Deep Green under similar conditions. A direct comparison of the data showed that the numerical model data needs to be resampled in a similar way that the ADCP would measure and process data using a virtual ADCP. The effect of the Deep Green on the tidal flow is analysed using the numerical model and the observations by comparing the instantaneous and time-averaged stream velocities. After resampling, the numerical model and observations show good agreement. This suggests that the numerical model can be used for further analysis such as array studies etc. Further, whilst making ADCP observations in tidal turbine wakes, the parameters of the instrument, especially the orientation of the beams, bin/cell size, and pulse lengths have a significant impact on the level of detail in the observed velocity profile.