Approach to estimating non-point pollutant load removal rates based on water environmental capacity: a case study in Shenzhen

An innovative approach based on water environmental capacity for non-point source NPS pollution removal rate estimation was discussed by using both univariate and multivariate data analysis.Taking Shenzhen city as the study case a 67% to 74% NPS pollutant load removal rate can lead to meeting the chemical oxygen demand COD pollution control target for most watersheds.In contrast it is hardly to achieve the ammonia nitrogen NH4-N total phosphorus TP and biological oxygen demand BOD5 pollution control target by simply removing NPS pollutants. This highlights that the pollution control strategies should be taken according to different pollutant species and sources in different watersheds rather than one-size-fits-all .

海绵城市理念在天府国际慢城项目中的应用

为实现成都天府国际慢城项目年径流总量控制率、面源污染削减率、雨水资源化利用三项海绵城市建设控制指标。首先对项目本底条件及现存问题进行分析;其次依据现场竖向标高、雨水管网布置及建筑屋面雨水径流等系统分析确定五个汇水分区;然后依据各汇水分区下垫面类型选取合适的海绵措施种类及规模;最后借助公式法对设计方案进行校核以满足海绵城市管控指标要求,即该项目年径流总量控制率75.48%>75.00%,面源污染控制率57.60%>50.00%,雨水资源化利用率5.45%>3.00%。