Estimated long-term aggradation (+) or degradation (-) (ft/m) - Stream Channel.
The estimated long-term change in the elevation of the channel section under the bridge/culvert over the service life of the structure.
Enter aggradation values as (+) and degradation values as (-). The primary source of information regarding long-term changes in the stream
channel and floodplain is typically the stream morphology report and bridge inspection records. Refer to Chapters 11 and 14 in the Office of
Structures H&H Manual for guidance on evaluating aggradation/degradation.