Hydrometry. Field measurement of discharge in large rivers and rivers in floodThis International Standard deals specifically with the measurement of discharge in large rivers and the measurement of rivers in flood. It also describes the relevant field measurements when it becomes necessary to use indirect methods of estimating discharge. It supersedes BS 3680 3M: 1990, which is withdrawn. Contents Foreword 1. Scope 2. Normative references 3. Terms and definitions 4. Units of measurement 5. Appropriate techniques 6. Nature of

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