Predicting Hydromodification Impacts Using a Four Factor Approach

Additional Info

  • Practice Areas: Contaminated Site Assessment and Cleanup
  • Event or Publication: Event
  • Title: 2018 Ohio Stormwater Conference
  • Geosyntec Authors: Matt Bardol
  • Citation: Kalahari Resort and Convention Center in Sandusky, Ohio on May 9-11, 2018
  • Date: May 9-11, 2018
  • Location: Sandusky, Ohio
  • Type: Presentation

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..

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