Planning Progress

Planning Process
Because the Lower Walnut Creek Restoration Project is a partnership with the Corps of Engineers, it must follow the federal government’s planning process. For the Corps of Engineers this includes a series of nine milestones, designated F1 through F9.



  • Baseline data gathering, including topography, bathymetry, and aerial photographs
  • Congressional authorization of study
  • Additional environmental baseline data gathering / wetland delineation / biological assessment
  • Hydraulics and hydrology studies
  • Public meeting / workshop to determine the project scope
  • Sediment transport analyses
  • Feasibility scoping conference that establishes the existing (without project) conditions and screens preliminary options
  • Alternative review conference to evaluate alternatives
  • Public review of draft report
  • Public meeting
  • Feasibility review conference
  • Submittal of feasibility report to Corps management
  • Division commander’s report to Congress on project feasibility

Assuming the feasibility study identifies an alternative that can be supported by the Corps of Engineers, the project (with Congressional approval) moves forward through the Design and Construction phases.

Project Status
As of 2010, the project is between the F2 and F3 planning milestones. Current efforts are focused on:
  • Economic impacts of flooding
  • Geotechnical analyses of existing levees to determine levee stability
  • Hydraulic calculations to determine the extent of expected flooding
  • Sediment modeling to better understand the sediment yield of the watershed and the impact on the downstream channel

The current emphasis is to develop a watershed-wide sediment transport model to determine the source and volume of generated sediment and develop a revised channel design that either allows the sediment to settle out in non-environmentally sensitive areas or to encourage the sediment to pass through the channel out to the bay.

This is a multi-year planning effort. The Corps’ progress on the project is completely dependent on the amount of federal funding available for the project. The amount of funding varies widely from year to year.