Water Quality Management Units and Classes (Rivers) as shown in the Land and Water Regional Plan.Water management units and water quality classes(Refer Chapter 4: Schedule WQL1 and Rules WQL1, WQL4, WQL7, WQL8, WQL21, WQL48)Water management units have been developed for all river and lakes outside the natural state areas, excluding rivers and lakes covered by the operative allocation regimes. For lakes the management units are based on the location of the lake in either high country or coastal areas, with separate units for artificial lakes either on a river or off river.Water quality and bed substrate outcomes for each management unit are set out in the tables in Objective WQL1. The outcomes take into account geology and location of the river or lake and other influences on water quality such as land use and the contribution from tributaries.Major lake and pond featrues that have been classified as part of the River Environment Classification by NIWA. Modified by ECAN to include some reclassified units. Features were classifed as part of The Natural Resources Regional Plan for bother Water Quality, and Lake Type. Water quality classes have been defined for all rivers and lakes in the Canterbury region, excluding the areas covered by the operative allocation regimes and water conservation orders. Each water quality class contains standards for water quality that are to be achieved for a point source discharge into a river or lake, after mixing of the discharge with the receiving water, in a defined zone. The rivers and lakes of the Canterbury region have been grouped into different types that have similar physical and hydrological characteristics