Criteria 5: Naturalnesss

Criteria 5: Naturalnesss

What does this map show?

Catchment Disturbance Index (CDI)

The Catchment Disturbance Index (CDI) is a catchment summary of human settlements, infrastructure, landuse and point sources of pollution that are expected to impact on aquatic ecosystem health (Stein et al., 2002).  The method uses geographical data recording the extent and intensity of human activities known to impact upon river condition to quantify disturbance along a continuum from near-pristine to severely disturbed. The index is calculated as a runoff contribution-weighted summary of these impacts in the catchment upstream and within each planning unit.  This index was calculated using the data on human activities detailed in Stein et al. (1998, 2002) with recent (2009) Land Use Mapping data for Australia (BRS 2009a), clearing information (BRS Integrated Vegetation dataset, 2009) and infrastructure data from the Geodata TOPO 250K series 2 database (Geoscience Australia, 2003)

Flow Regime Disturbance Index (FRDI)

The Flow Regime Disturbance Index (Stein et al., 2002) is a catchment summary of impoundments, flow diversions and levee banks within and upstream of each planning unit (calculated using data sources as per CDI).

Sample map 5: Naturalnesss

Criteria 5: Naturalnesss