1. For a split flow optimization, first of all we need to estimate the initial supplies of the total flow in both separate channels. HEC-RAS will then uses these initial flow estimates to perform computation from downstream to upstream on both the channels.
2. From Steady Flow Analysis click on Options and select Flow Optimization and under the Flow Optimizations dialog box you need to select the check box for Junction.
3. When the junction tab is selected, perform the analysis by computing the water surface profiles for all the reaches.
4. Then compare the computed energy grade lines for the cross section just downstream of the junction.
5. If the energy in all the reached below the junction is not within a specified tolerance (0.02 feet). Then the flow going to each reach is re-distributed and the profiles are re-calculated.
6. The methodology continues until a balance is reached.
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