United States Department of Transportation
i
Streamlining Implementation of Sustainable Channel Maintenance Practices
-
2019-06-01
[PDF-2.74 MB]
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Edition:Final Report
-
Corporate Publisher:
-
Abstract:Projects were implemented at seven sites to determine if implementation of natural channel design-based maintenance practices could be streamlined when completed with state sources of funding. Projects that could be completed under Section 404 general permits without project-specific authorization from the ACOE (e.g., non-notifying) were identified and installed without much difficulty. Clear guidance was developed by ODOT OES to help District and County staff determine which types of projects met criteria for non-notifying permits. Additionally, two-dimensional hydraulic modeling was completed for six projects including three single arm vanes and three culvert weirs. Model results indicated that the single arm vanes reduced shear stresses and shifted them away from the stream bank and embankment towards the center of the channel for the most frequent events. Modeling for the culvert weir projects indicated that concentrating the low and intermediate flows by partially blocking one culvert in a twin culvert arrangement resulted in shear stresses that were more consistent with the natural channel upstream and downstream of culvert for the bankfull discharge. Modeling results also revealed that the water surface elevations for the post-maintenance conditions were improved relative to the pre-maintenance conditions; however, capacity post-maintenance was less than originally designed and constructed. The findings of the research could also be used to improve new and replacement bridge designs. We recommend that an evaluation of sediment transport from the natural channel upstream through the opening and to the downstream natural channel be completed during the design process.
-
Format:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
