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Geomatics was used in this paper to provide efficient tools to create maps and to perform all the necessary analysis about crops (computation of areas, discrimination of crop types etc.) in Mujib Basin (MB), in a timely and cost-effective manner which can't be delivered using the conventional surveying technology. The use of these techniques allowed the identification and the delineation of agricultural parcels and then the computation of their areas in this basin. This leads to the production of a digital crop map. The obtained crop map beside FAO and climatic data permitted the evaluation of water requirements for crops during the intended period. This study showed the efficiency of geomatics techniques to reveal the illegal use of the underground water resources in comparing with the well production in this basin and to estimate the water requirement to irrigate all parcels during the year 2015. Significant difference between well production and water requirements for the parcels irrigated from underground water is found. This proves the use of illegal water resources for example by digging wells without permission or taking water from main pipelines before metring. This metring helps the control of the consumed water from underground reservoirs. [ABSTRACT FROM AUTHOR]