Hydrologic Water Balance Report for Small Irrigation Farm (<10ha)

I need a water balance report for a small farm. I am looking to employ a qualified hydro geologist to do this. I have elevation data, rain days >1mm and Mean and Median Rainfall (30 years till 1991-2020). A dam is in the middle of the farm and 70% of the area will be used for cabbages, potatoes and cauliflower. Irrigation estimate 16ML. I can get soil type info also. No crop periods need to be considered. Do you use MODFLOW? Do you have water balance report examples you can show me? The calculation of losses from the property will need to be considered in the model.