Hello everyone, I’m searching for a method that allows me to retrieve the drainage basins from a mesh. In this simple example I recreate a mesh with two basins and I want to obtain two separate meshes, i searched for a topic but I didn’t find anything that could help me and I have no idea of how I…

Hello here is a way. I used Mesh Flow from Parakeet, not sure it is the best for this task but it works in your case. So first make a departure at each face center. Go to the end so the step and number of iterations are important. Group points Then use the grouping order to group the faces. Jo…

this is very close to what you are looking for: [2020-18 LTH Tutorials: Simple water flow analysis ( Grasshopper )]

There’s various threads on that: search Mesh Drainage, Drainage etc (in this or the old Forum). I have various C#'s for that but are internal. However Laurent had provided some solution(s) - if memory serves well.

Thanks for your reply @inno but I’ve already achieved that: [2023-11-29 11_06_52-Window] now I want to split the mesh in two basins (the red one and the blue one) because I need the for some calculations (min point, max point, area, ecc.)

Thanks Peter maybe I missed something I will search again. I just want to understand “physically” how it works. How I can find the “ridge” between the two basins.

Thanks Laurent and sorry for the useless topic. I also used “Watershed” node from “Bison” package but it needs a point to calculate the watershed: [2023-11-29 11_27_22-Window] and I cannot understand how it works properly. I want to obtain all the basins from a mesh without specify a basin closu…

Why not using my script, just change the drainage tool for a more efficient one. My logic is explained. So it must work if all drainage path from a basin converge to nearly the same point.

Maybe there is a misunderstanding I just wanted to apologize to have started a useless topic in the forum I didn’t want to say that your topic was useless.

No problem, I am not sure it is useless as you didn’t find a proper solution. If you manage to make one proper solution working with your data, I’ll like to see it.

Well … I do business solely via code (in most of real-life cases strictly internal stuff) so my answer would not be the right thing for you (unless you have plans to walk the C# walk - long and hilly). In the mean time Laurent is your man (but he’s also in the C# bandwagon).

[image] Water runoff script for network of curves Grasshopper When I closed your previous file, Rhino/Grasshopper froze and then crashed. Not good! Looking at your updated file, I see HUGE numbers of points and data tree paths (many empty) in the outputs, so it’s very li…

Drainage basin

Grasshopper

Joseph_Oster November 29, 2023, 2:14pm 12

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Drainage basin

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