Term
Description
River reach
Individual element of a river network defined as the segment between two or more confluences. Each river reach has a unique identifier (Field: GOID).
River
Set of contiguous river reaches forming one linear feature from source (i.e., the location where a river exceeds 100 l/s average discharge or 50 km2 upstream area) to sink (i.e., river mouth at ocean or at inland depression where flow terminates). Tributaries to larger rivers form distinct rivers. Each river is defined by its identifier (BB_ID). The river name is given in field BB_NAME
Pressure indicator
Data layers used in a model to determine impact score / CSI of each river reach. The fields for the five pressures are: DOR, DOF, URB, RDD, USE
Dominant Pressure Index
The pressure that had the largest effect on the cumulative CSI value. Field: ``DOM``
Connectivity Status Index (CSI)
Index value on a sliding scale between 0 to 100% (100 = best connectivity) for each river reach. Field: CSI
CSI threshold
Threshold at which river reach is considered free-flowing (in a binary sense). CSI threshold is 95%, if below, river reach is considered not Free-flowing
Free-flowing river
Set of contiguous, aggregated river reaches where the CSI value of all river reaches are above the threshold from source (i.e., the location where a river exceeds 100 l/s average discharge or 50 km2 upstream area) to sink (i.e., river mouth at ocean or at inland depression where flow terminates). Field: CAT_FFR = 1
“Good connectivity status”
Set of contiguous, aggregated river reaches forming a river stretch; one or more parts of the remaining river are above the CSI threshold. Field: CAT_FFR = 2
FRA
Free-flowing River Analysis