Under base employ of the coated urea, the total N concentration of farm surface water was near the contract level, and the possibility via runoff was very little.

结果表明，包膜尿素在基施情况下，田面水总氮浓度始终接近对照水平，通过径流损失的可能性很小。

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On the base of having surveyed a lot of karst basins, collected the hydrologic date and analysed the physical process of runoff generating , a hydrologic model was presented in this paper.

在大量岩溶流域查勘及水文资料收集的基础上，分析了岩溶流域径流形成的物理过程，提出了相应的水文模型。

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The target porosity and thickness of pavement of the permeable asphalt mixture on the basis of the factors such as reducing the runoff, the filter ability of soil base and pavement overflow.

基于减小地表径流、土基渗透能力及铺装溢流量等方面因素，设计透水性沥青混合料的目标孔隙率及铺装厚度；

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