Special features of the channel water balances method application for the runoff accounting reliability analysis at the rivers with complicated hydro/morphological regime (a mountain river with the wide floodplain and a multi/armed channel) have been discussed. The individual balance components contribution has been assessed. Assessments of the runoff hydrometric accounting inaccuracies have been obtained for the Samur River and its tributaries' ranges. The channel water balances calculation

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... comes for various time spans (daily, decade, monthly, and annual) have been listed. When analyzing a many-year observation series results for the Samur River runoff at the range between Akhta and Usukhchay hydrological stations numerous runoff discrepancies (losses) have been revealed. Suppositions on the possible causes of the runoff portions' loss at the approaching to the closure range have been formulated. The method has been recommended provided the accounting of the possibly complete set of the balance input and output components.