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Under natural conditions, the channel geometry is usually the dearest expression of its adjustments to high-water flows. These adjustments often implie changes in the bed-forms and changes in width and depth of the channel related to extreme and dominant discharges. This work devotes special attention to that relationship, choosing the channel geometry method, in order to study it. Method has been used by a lot of authors as an inderect method to estimate flood discharges. Here, it has been applied to the sector in the 'Vega Alta' of Segura, where the channel shows net geomorphic reference levels and a meandering pattern which is well defined. For the set of reaches potential equations have been obtained empirically. Equations that relate discharge records in gauge stations to channel dimension measurements based in cross-sections near them. The results are a theoretical approach comparable to regional aquations which 1 have been developed in other fluvial semi-arid environments.