Channel & Overbank Transition Option

Since the program divide the flow into channel and two overbanks. If the abutment is right at edge of the bank, the scour at the abutment will be that for channel. If we setback the abutment a small distance away from the edge of the channel, the scour condition should not be very far away from that for channel. There is a transition zone between the channel flow and overbank flow. The program uses 5 times channel flow depth as the limit of this transition zone. Program calculates four scour cases for each overbank. They are: 1. Clear-water scour of channel flow 2. Clear-water scour of overbank flow 3. Live-bed scour of channel flow 4. Live-bed scour of overbank flow The program then interpolates the transition zone after scour flow depth depending on the setback distance and the scour type in channel and in overbank of interest. For example, if the channel if live-bed scour and the overbank is clear-water scour and the setback is in transition zone, then the program will interpolate the after scour flow depth between case 2 and case 3 listed above. However, when the overbank if armored, then this interpolation should not be applied. This option allows user to specify whether to use above interpolation or not to use the interpolation.