Fenced off wetlands should be entered as a wetland block. If artificial wetlands are used to treat outlets, these should be added as a wetland within a block (under the drainage tab). It is important that the same wetland is not included more then once.
There are four types of Fenced Wetland conditions:
- Natural: is defined as well vegetated, with evenly distributed surface flow and no channelization.
- Artificial Type 1: Flow path length to width ratio >5 (2 or more stage wetland, with even elongated channel or serpentine path created using internal bunds), well vegetated with good dispersion and even flow through the majority of wetland and minimal channelisation or dead-zones.
- Artificial Type 2: Single stage wetland with flow path length to width ratio >3, well vegetated with even flow through majority of wetland and minimal channelisation or dead-zones
- Artificial Type 3: Single wetland with length to width ratio >3. Still well vegetated, but with some potential for flow channelisation and short-circuiting.
For more information on wetland conditions, see the NIWA Wetland Condition Guide here
There are five wetland types you can select:
- Type A: Water always flows. Dominated by sedges and reeds. May contain flaxes, willows, etc.
- Type B: Flows most of the year. Dry in drought.Abundant sedges and rushes.
- Type C: Flows in autumn, winter and spring. Dry in summer.Some sedges and reeds. Dominated by pasture grasses.
- Type D: Only flows during rain. Pasture grasses.