Hi Mohamad
You would require to store the river water levels as FEFLOW Time Series. If you
have the river network as a polyline shapefile (or similar), you can use the
option "Link to Parameter" (context menu of a selected map) to carry out a
linear interpolation along the river lines and using the points with the river
level time series. Take a look on this
description: https://download.feflow.com/html/help81/feflow/09_Parameters/1D_interpolation.html
If you have a valid support agreement, please reach out FEFLOW support team
(mike.de@dhigroup.com).
Cheers
Carlos