Description: Geomorphic stream condition at time of assessment. It indicates whether the physical form and function of the reach is appropriate and expected for the Style of river and the environmental/landscape setting in which it is found. Good condition reaches have the expected geomorphic character (physical form and features, including vegetation) and behaviour (response to disturbances and adjustments) for a particular River Style. Moderate condition reaches are noticeably impacted, typically through human disturbance. Poor condition reaches have accelerated degrading processes and lack geomorphic character expected of a reach.
HISTORICAL_CONTEXT
(
type: esriFieldTypeString, alias: Historical or evolutionary context of the reach, editable: true, nullable: true, length: 255, defaultValue: null, modelName: HISTORIC_CONTEXT
, Coded Values:
[Artificially channelised: Artificial channel cut into accumulated valley-fill or floodplain sediments]
, [Bank Confined: These rivers flow through ancient alluvium and have limited capacity to adjust in vertical or lateral dimensions]
, [Channelised fill: Incision of a valley-fill reach due to post-European landuse changes]
, ...13 more...
)
Name: Potential to recover from its current condition
Display Field: RECOVERY_POTENTIAL
Type: Feature Layer
Geometry Type: esriGeometryPolyline
Description: Potential to recover from its current condition (Recovery potential) – the likelihood that a river reach will improve its geomorphic condition over management timeframes. Recovery potential is then used for prioritising river management actions. This field has been updated for the new geodatabase to separate Strategic, which is a prioritisation value, from recovery potential. Some catchments may have the value ‘Strategic – to be assessed’ to indicate that it was previously assessed as a strategic priority and therefore contained no value for its recovery potential. These values will be updated as new assessment of the catchments are undertaken.
HISTORICAL_CONTEXT
(
type: esriFieldTypeString, alias: Historical or evolutionary context of the reach, editable: true, nullable: true, length: 255, defaultValue: null, modelName: HISTORIC_CONTEXT
, Coded Values:
[Artificially channelised: Artificial channel cut into accumulated valley-fill or floodplain sediments]
, [Bank Confined: These rivers flow through ancient alluvium and have limited capacity to adjust in vertical or lateral dimensions]
, [Channelised fill: Incision of a valley-fill reach due to post-European landuse changes]
, ...13 more...
)
Description: River reaches are prioritised for management or intervention according to condition, recovery potential and spatial relationships to other reaches which may affect, or be affected by, processes operating in adjacent reaches. This field has been updated for some catchments when the most recent River Styles assessment was completed. Other catchments have been updated using calculations in ArcGIS based on stream condition, recovery potential and connections to other reaches.
Intact Geomorphic condition - Good Rate of recovery or presently occurring - No recovery occurring or required. Has not been recently disturbed or has fully recovered from past disturbances. Sediment, seed or large wood input - Appropriate for the River Style. None.
High Priority Geomorphic condition - Moderate Rate of recovery or presently occurring - Quickly if existing pressures are removed and connected to good condition upstream reaches. Or at moderate rate if disconnected to good condition upstream reaches. Sediment, seed or large wood input - May have sediment, seed or large instream wood (if required) input depending on upstream reaches. Excess sediment supply - Small sediment slugs.
Moderate Priority
Geomorphic condition - Moderate to poor Rate of recovery or presently occurring - Presently occurring. Slow to moderate rate if existing pressures are removed. Sediment, seed or large wood input - Little sediment, seed or large instream wood (if required) input. Excess sediment supply - Moderate sediment slugs
Low Priority
Geomorphic condition - Poor Rate of recovery or presently occurring - Very slow. No or very little recovery occurring. Often degradation still occurring. Has recently changed or is on the verge of changing to a different style category. Sediment, seed or large wood input - No sediment, seed, or large instream wood (if required) input. Excess sediment supply - Large and continuous.
HISTORICAL_CONTEXT
(
type: esriFieldTypeString, alias: Historical or evolutionary context of the reach, editable: true, nullable: true, length: 255, defaultValue: null, modelName: HISTORIC_CONTEXT
, Coded Values:
[Artificially channelised: Artificial channel cut into accumulated valley-fill or floodplain sediments]
, [Bank Confined: These rivers flow through ancient alluvium and have limited capacity to adjust in vertical or lateral dimensions]
, [Channelised fill: Incision of a valley-fill reach due to post-European landuse changes]
, ...13 more...
)