xsection-class: Cross-Section Object
In rchlumsk/rcr: River Computations in R

xsection: A reference class to create a cross-section with all relevant data and static hydraulic properties.

riverstation: name of the cross-section as character
station: station location along profile as numeric value
xx: horizontal coordinates of 1D section
zz: vertical elevation coordinates of 1D section, corresponding to xx
Manning: vector of Manning's n values corresponding to xx (currently not used in rcr)
Manning_LOB: Manning's n value for the left overbank area
Manning_Main: Manning's n value for the main channel area
Manning_ROB: Manning's n value for the right overbank area
lbs_xx: horizontal co-orindate of the left bank station
rbs_xx: horizontal co-orindate of the right bank station
ds_length_LOB: downstream length of the left channel overbank
ds_length_Main: downstream length of the main channel (to the next cross-section)
ds_length_ROB: downstream length of the right channel overbank
contraction_coeff: contraction coefficient for use in energy loss calculation
expansion_coeff: expansion coefficient for use in energy loss calculation