Quelqu'un a-t-il utilisé l'outil stream order spatial analyst pour le réseau d'égouts ?

Question

<\/HEAD>Je travaille sur un projet d'analyse des égouts pour l'école\/le travail et j'essaie d'ordonner le réseau d'égouts en utilisant l'outil stream order networking, mais j'obtiens des résultats très confus. Je peux créer une grille raster pour le réseau d'égouts ; cependant, je ne peux pas créer un raster de direction d'écoulement précis. Les valeurs de direction d'écoulement n'ont pas de sens pour moi. J'ai quelques captures d'écran ci-dessous qui montrent les résultats.<\/P> <\/P> Si quelqu'un a de l'expérience avec ces outils et peut fournir des retours, ce serait grandement apprécié. <\/P> <\/P> <\/P> <\/P> <\/P> <\/P> <\/P><\/BODY><\/HTML>

HowardCrothers · Answer

You might be able to use the Summary Flow Accumulation tool on the Water Utility Network Reporting toolbar to get at the answer.  Requires your data to be in a geometric network.  You could use it sum the number of upstream manholes for each pipe and use that a proxy or if you have customer connections you could assign a weight to each connection and accumulate that for each upstream pipe. Water Utility Network Reporting toolbar - Water Utility Network Editing and Analysis | ArcGIS Solutions for Water

EricSwett · Answer

Howard,

Thank you for your reply. I currently have a vector sewer network, but I am trying to identify the pipes in the system as first, second, third-order pipes. I have data from our hydraulic sewer model, which shows flow data, but I want to be able also to see which pipe segments have "upstream branches" and how many branches are upstream.

I haven't been able to find a vector stream ordering tool so I was trying to see if I could convert the vectors into rasters and use the tools, but no luck.

Thanks,

Eric

HowardCrothers · Answer

Not sure exactly what your project is, but the hydrology tools like Stream Order and Flow Direction are used to analyze surface flow across a continuous surface, like a DEM.  So those tools are typically used for surface water, not for pipes.

The first bullet point under Usage sounds like the results you are experiencing if you turned your pipes into a raster - Stream Order—Help | ArcGIS Desktop

Most organizations represent their sewer system using vector data (typically a network) and use that vector data to perform analysis.