Defines the topological sequence of catchments for nitrogen.
Format
A data frame with 5 variables:
HydroIDinteger positive. Unique catchment identifier.
To_catchinteger. Unique identifier of the catchment to which the catchment goes. Note that for the outlet To_catch== -1.
Shreveinteger. this indicates the Shreve order of the topological sequence in the stream network.
LakeFrRetfraction, 0-1. Lake retention fraction.
NrmLengthKmdouble. Normalized length of catchment reach.
