The impacts of hydromodification are frequently manifested through changes in stream morphology.
Methods for managing hydromodification have focused on maintaining the pre-development frequency distribution of runoff. This approach assumes that there are no changes in sediment supply, bed/bank material composition, and channel geometry due to land development; however, changes to these additional three factors may impact the geomorphic stability of streams. These factors should be considered in hydromodification-related regulatory, planning, and stream enhancement efforts. A step-by-step approach for modeling geomorphic impacts due to changes in land use by: (1) properly characterizing the four primary factors controlling channel adjustment for both the pre- and post-development condition, (2) incorporating these characterizations as inputs to a long-term continuous sediment transport model, and (3) predicting the likelihood of channel form adjustment based on the ratio of sediment transport capacity in the pre- and post-disturbance conditions will be presented and illustrated through examples..