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NDDOT Proposed Guidance

Plans & specifications need to address:

Aquatic Life Movement

Flow Conditions

High Flow

Current Practice

  • Size stream crossing for a 2 year - 24 hr Storm Event

Low Flow

Plans

  • Sink the bottom of the structure 4" below the channel bottom

More than just fish

  • 2.5 ft/s for average flow conditions

Minnows

Frogs

Crayfish

Leeches

Microorganisms

  • Bypass Geometrics
  • Some Erosion Control

Erosion & Sediment Control

  • Riprap below the waterline
  • Stabilization for disturbed areas
  • Combination of stabilization & sediment control
  • Flexibility to fit actual site conditions

Specifications

Section 710 - Temporary Bypass

"It shall have a waterway opening sufficient to provide for the stream flow during the time the structure is in place. The type and details of the structure shall be the Contractor's responsibility."

Does that work?

It can work, but leaves many of the details up to the contractor and engineers interpretation.

The way forward.

Temporary Bypasses & Water Diversion Channels

2012 Office of Project Development Conference

Matt Linneman

mlinneman@nd.gov

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