There was a decreasing trend in each pollutant concentration with rainfall duration and finally tends to flat. So we collect the rainwater after abandoning part of the initial flow of rainwater.
并且各污染物浓度均随降雨历时呈减少趋势，后趋于平缓，可采用弃流部分初期雨水后进行收集。
The water flow volume and phosphorus concentration in both runoffs increased with the rainfall intensity improved;
降雨强度大，表面径流和壤中流始流时间早，水流量和浓度相应高，累积输出也多。
However, during the second rainfall, there was notable discrepancy for chemical concentration in runoff from the different conditions.
二次降雨过程中径流养分浓度存在显著差异。
The road runoff is most seriously polluted , especially in the early rainfall the pollutant concentration was significantly higher than concentration in roof runoff and lawn runoff.
路面雨水径流污染最严重，尤其是初期雨水各污染物浓度明显高于屋面和绿地径流中的污染物浓度；
This is mainly because of human activities so that a change in basin surface, the changes in rainfall reduced susceptibility characteristics of generation and concentration.
这主要是因为人类活动使流域下垫面发生了变化，对降雨特性变化的敏感性降低。
Nitrate concentration of were higher in low simulated rainfall treatment than the high treatment, and the amounts of nitrate leached were the opposite.
模拟降雨量小的处理的淋溶液中的硝态氮浓度高于模拟降雨量大的处理，但硝态氮的淋溶量则好相反。
Rainfall simulation experiment was performed to evaluate nitrogen losses from farmland and show the effect of fertilizer application on nitrogen concentration and losses of runoff.
在室内降雨模拟试验条件下，研究暴雨径流中农田氮素养分流失及施肥处理的影响。结果表明，农田暴雨径流氮养分的流失量与累积径流量成正相关；
Almost all the sediment yield models of heavy rainfall built in recent years have adopted the assumption of sediment transport concentration of gullies and rivers being equal to 1.
近几年来建立的各类暴雨产沙模型，基本都采用沟道、河川泥沙的输移比等于1的假定。
Almost all the sediment yield models of heavy rainfall built in recent years have adopted the assumption of sediment transport concentration of gullies and rivers being equal to 1.
近几年来建立的各类暴雨产沙模型，基本都采用沟道、河川泥沙的输移比等于1的假定。
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