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Sacramento River Flood Control Project Colusa Through Drainage Canal California

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The Water Resources Development Act of 17 November 1986 authorized remedial construction necessary to restore the Sacramento River Flood Control Project levees along the Colusa Trough Drainage Canal and the Knights Landing Ridge Cut, subject to review and comment of the project work by the Secretary of the Army and the submittal of report findings to Congress. The Act staled that if the Secretary did not comment before the end of a 3-year period beginning on the date of the Act. the project work would be deemed to have been approved by the Secretary. Construction General funds were appropriated in FY 90 under the Sacramento River Flood Control Project to initiate advanced engineering and design studies for the project levees within the study area. Additional funds were made available in FY 91 and FY 92 to determine the extent and scope of reconstruction work required to restore the levees to the congressionally authorized and approved design levels. The study area includes about 13 miles of project levees on the Knights Landing Ridge Cut and about 36 miles of project levee on Colusa Trough Drainage Canal. Engineering and geotechnical evaluations indicate about ii miles of levees require remedial construction to correct for stability and seepage problems inherent in the design and construction of the original project. Although there is always the question of adequate maintenance by the local agencies. it is concluded that the stability and seepage problems are the result of internal soil conditions within the levee embankment and subsurface foundation and not inadequate maintenance. 8.5 miles of the reconstruction work located on the Colusa Trough Drainage Canal levee and the west levee of the Knights Landing Ridge Cut see Figure 7 is not economically justified incrementally.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

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