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水文要素数字的有效位数,反映了生产上对这些数字精度的需要和测验仪器达到精度的可能性。因此,我国的水文规范对水文数据的有效位数作了严格的规定。例如:《水文年鉴编印规范》中的“各项因素的单位和有效数字一览表”列出了各项目所要求的有效数字位数和小数最多保留位数;
The number of significant digits for hydrographic elements reflects the production’s need for precision of these numbers and the possibility of testing instruments to achieve accuracy. Therefore, the hydrological regulation of our country has made strict regulations on the effective digits of hydrological data. For example, the “List of units and significant figures of various factors” in the “Yearbook of Hydrological Yearbooks” lists the number of valid digits and the maximum number of decimal places required for each item;