Water Quality - river polygons and lakes

1:50,000 NZMS260 topographic lake and river polygons classified by water quailty. Water quality classifications from the Regional Water and Land Plan.1:50000比例尺的NZMS260地形数据中的湖泊与河流多边形要素，已按水质进行分类。其水质分类依据来自《区域水土规划（Regional Water and Land Plan）》。