Geomorphic Grade Line REM tool

[MatthewHolland]

Does anyone know if a tool like this exists for ArcPro? or perhaps something akin to it?

https://github.com/helstab/GGLREM

Basically, it de-trends the down valley slope of a river system and creates a relative elevation model based on what is assumed to be a flat river surface. I'm hoping to map inundation extents over large areas with this tool. 

[kterry1983]

Here's is a step by step. 

https://mediaspace.esri.com/media/t/1_pn5ltf54

[MG231]

Hello 

Is this video still available please? When I go to watch it doesn't play. 

Thanks