I am in desperate need of some help. I???m in over my head. I hope someone can throw me a life line.
What I need to do is create polygons (basins) that are at a specific elevation, for a flood event, within a number of different watersheds.
???I have a DEM of the area, which I have created the watersheds and depression basins from.
???I have the volume for each depression and its top elevation within each watershed, along with a spill/pour elevation for the watersheds.
???I have a volume (not an elevation) for the flood event for each of the watersheds.
I need to create an ???event basin??? for each of the watersheds. (Don???t worry about watersheds that have a depression volume less than the event volume)
I am using ArcEditor 9.3 and have the following extensions: Spatial Analyst, 3D Analyst and ArcHydro (which I have never used). (I had felt pretty competent in Spatial Analyst till now.)
If you could give me some step by step instructions, or the equation I need to use, to create a raster of the new elevations it would be GREATLY appreciated!
THANKS!