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United States Department of Agriculture

Agricultural Research Service

Research Project: Updating NRCS Technical Release #56 with Floating Wave Barrier Guidance

Location: Watershed Physical Processes Research Unit

Project Number: 6408-13000-023-10
Project Type: Reimbursable

Start Date: Apr 01, 2011
End Date: Sep 30, 2013

Objective:
Use the results of the project entitled “Development of Wave-Energy Absorbers for Cost-Effective Protection of Levees in Irrigation Reservoirs” to update Technical Release No. 56 (TR56) “A Guide for Design and Layout of Vegetative Wave Protection for Earth Dam Embankments.” The update material will be geared towards application by NRCS field engineers.

Approach:
Summarize the findings of “Development of Wave-Energy Absorbers for Cost-Effective Protection of Levees in Irrigation Reservoirs” by using appropriate narrative, plots, and lookup tables so that the information can be readily used by a field engineer. The TR56 update will include a review of relevant literature describing research conducted since its publication in 1974. This will result in a more contemporary work that describes the current methodology for using floating wave barriers and vegetation for levee protection. The wave barrier work will be summarized with only information relevant to an engineer seeking to design a wave barrier system included. This will include a technique specific to small reservoirs for estimating wave characteristics from wind speed and fetch length. Example calculations for wave barrier design will include wind/wave prediction, barrier sizing, and estimated performance of the wave barrier. It is not anticipated that this update will include comprehensive specific recommendations on materials, connections, etc. The focus will be on the necessary dimensions and buoyancy needed for wave energy reduction. A limited amount of logistical testing may be performed to help with guidance on floating wave barrier assembly.

Last Modified: 7/28/2014
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