These files are part of the library 'Kalypso-NA'. Main code sections (modules, subroutines, functions etc.) are developed and written by Dr.-Ing. Sandra Hellmers within her dissertation (Hellmers 2020):
- mod_bodenArt.f90
- mod_bodenData.f90
- mod_bodenDrainage.f90
- mod_bodenLayer.f90
- mod_networkPlan.f90
- mod_nodes.f90
- mod_overlay_ctrl.f90
- mod_retentionPond.f90
- mod_routing.f90
- mod_strands.f90

Theoretical approaches, deriviation of equations and the overall methodology is explained in the dissertation (Hellmers, 2020), (Hellmers & Fröhle 2017) and (Hellmers & Fröhle 2021).
The executable core Kalypso-NA_4.0 is released and published in February 2021: http://kalypso.wb.tu-harburg.de/downloads/KalypsoNA/
Supplement information about input and output parameters to compute backwater effects in surface waters of tidal lowland catchments including control structures are summarised in the attached file: "Hellmers_supplement_2020_parameters_backwater.pdf".
The code "Kalypso-NA" is published under the terms of the GNU Lesser General Public License as described by the Free Software Foundation, version 2.1.

References:
Hellmers, S. and Fröhle, P. (2021): Computation of backwater effects in surface waters of tidal lowland catchments including control structures 
	– An efficient and re-usable method implemented in the hydrological open source model Kalypso-NA (4.0), Geosci. Model Dev. Discuss. 		[preprint], https://doi.org/10.5194/gmd-2021-140, in review.
Hellmers, S. (2020): Integrating local scale drainage measures in meso scale hydrological modelling of backwater affected catchments, 
	Dissertation, Institute of River and Coastal Engineering, Technical University Hamburg, Hamburg, Germany. 	https://doi.org/10.15480/882.2627
Hellmers, S., & Fröhle, P. (2017). Integrating local scale drainage measures in meso scale catchment modelling. Water (Special Issue: 	
	Hydroinformatics and Urban Water Systems), 2017(9,71). https://doi.org/10.3390/w9020071