I have detailed elevation data (0,5-1 point per 2sq m) and also converted from points to raster. I also have access to ortho photos, location of bridges and just about every thing you can imagine. But still I'm at a loss. I have found the sinks and their watershed. But I don't know how to go on and calculating the possible volume of each sink.
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As described in the picture there is several ways to think about the depth of the sink. What I need is the volume of the sink from the "blue spot lower height" to the "blue spot sink", ie the water surface (marked red).
Is there ANY way this is possible to do with AG 10, ArcInfo, Spatial Analyst and 3D-Analyst? (in the summary report of Blue spot it says its possible, but I just can't figure out HOW)
There is a tool called Sink Evaluation available with ArcHydro. I've confirmed with the ArcHydro team that it does exactly what you're asking for. ArcHydro is free and is available from the Hydro team's blog post, Arc Hydro Tools Version 2.0 Are Now Available!. Esri Support Services does not support these tools. If you encounter issues with any ArcHydro functionality, you can post in the ArcHydro Forum, or email archydro@esri.com.
Please review the documentation for the tool. It outputs a lot of information in addition to the volume calculation you're seeking.