MS4_Connection_Point_Drainage_Areas_2021

The MS4 connection points drainage areas are the drainage areas for MS4 connection points. They were based on the true drainage area leading to the MS4 connection point, ignoring the permittee boundary. They are a subset of the MS4 tributary areas, multiple connection point drainage areas potentially would have to be merged to together if an upstream drainage number is needed.

MS4连接点汇水区指对应MS4连接点的汇水区域。该类汇水区以汇入MS4连接点的实际汇水范围为基础划定，未考量许可方的边界范围。此类汇水区属于MS4支流汇水区的子集；若需获取上游汇水总量，则可能需要将多个连接点汇水区进行合并。