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淤地坝防洪能力包含两个方面,一是工程自身的防洪能力(即防御标准);二是坝地生产的防洪能力(即指坝地的防洪保收标准).淤地坝工程自身的防御标准,在有关规范中已有过明确规定和要求.而坝地生产的保收能力、保收标准,则是随着大规模坝地的形成和生产利用逐渐提出来的.从坝地淹水深度与淹水历时及淤积厚度对作物产量的影响考虑,提出了多沙粗沙区淤地坝防洪保收的标准为:洪水频率5%、作物保收率80%以上.通过淤地坝防洪保收指标和临界值的分析计算,得到黄河中游多沙粗沙区淤地坝防洪保收条件:坝地淹水深度小于作物株高的1/3,淹水历时在7天之内,淤泥厚小于作物株高的1/5.
Flood control dam silt contain two aspects, one is its own flood control capacity (ie, defense standards); the second is flood control capacity of dam production (that is, dam flood control standards.) Dam dam project’s own defense Standards, in the relevant norms have been clearly defined and requirements of the production and acceptance of dam production capacity, the acceptance criteria, it is with the formation of large-scale dam land and production and gradually come up with flooding from the dam Depth and duration of flooding and the effect of siltation thickness on crop yield, the criteria for flood control and retention of siltation dam in sandy and sandy area are proposed as follows: the flood frequency is 5% and the crop protection rate is above 80% According to the analysis and calculation of the indicators and the critical values, the conditions of flood control and retention of silt dam in the middle and high reaches of the Yellow River are obtained: the depth of flood in the dam land is less than 1/3 of the crop height, the flooding lasted within 7 days, Thicker than the plant height of 1/5.