Table 1 Definition of rivers at level 1 to 4.
From: A data set of global river networks and corresponding water resources zones divisions
Type | Definition of the rivers at level 1 to 4 |
|---|---|
The independent WRZ | L1 river: the river that flows into the sea or lake. |
L2 river: the river that flows into the L1 river, and its confluence area is larger than one hundredth of the L1 river or 10,000 km2. | |
L3 river: the river that flows into the L2 river, and its confluence area is larger than one hundredth of the L2 river or 1000 km2. | |
L4 river: the river that flows into the L3 river, and its confluence area is large than one hundredth of the L3 river or 100 km2. | |
The combined WRZ | L2 river: the river which has second-order tributary. |
L3 river: the river which has first-order tributary. | |
L4 river: the river which has no tributary. |
