Only two elements can be merged at one time. Reaches should have an upstream-downstream relationship. Subbasins can be side-by-side adjacent (if the merge produces a logical single outlet) or upstream-downstream so that the outlet for the merged sub-basin is the same as the lower subbasin. Subbasins and reaches must be adjacent to each other for the merge operation to work. Five subbasins and two reaches were delineated ( HEC-HMS project file of Post Part 1 of 3) and now we want to merge Subbasin_3, Subbasin_4 and Subbasin_5, as well as R_1 and R_2 reaches. After Bear Creek Watershed has been initially delineated using HEC-HMS GIS tools ( Post Part 1 of 3), the delineated subbasins and reaches can be further refined by HEC-HMS merge and split functions.
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