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。
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