Case Study: Kaneohe Stream Bank

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Case Study Overview

Project: Kaneohe Stream BAnk Restoration
Location: Oahu, Hawaii
Project Type: Streambank Stabilization
Product Used: PYRAWALL®

Photo of erosion along Kaneohe Stream.

Problem

Over the past 30 years, high-flow events in the Kaneohe stream system eroded higher portions of the channel, causing enroachment of several private properties. To prevent additional property loss, the City and County of Honolulu wanted to find a solution that would provide long-term channel stabilization. Historically, a concrete solution has been used, but the City and County wanted a "soft" more natural system that encouraged growth of native vegetation.

Solution

PYRAWALL®, an engineered wrap-faced vegetated solution, was selected to reinforce 330 feet of Kaneohe Stream. The installation ranged from six to eight feet high and was designed based on geotechnical information available at the site. This included steep 1H:4V slope segments with a mid-slope planting bench. PYRAWALL combines High Performance Turf Reinforcement Mat (HPTRM) with internal braces to reinforce soil mass and resist lateral earth pressures. It is also designed to encourage vegetation and is a vegetated Best Management Practice Solution for NPDES Storm Water Compliance

Photo of PYRAWALL installation in progress.
Photo of PYRAWALL installation in progress.

Solution

PYRAWALL®, an engineered wrap-faced vegetated solution, was selected to reinforce 330 feet of Kaneohe Stream. The installation ranged from six to eight feet high and was designed based on geotechnical information available at the site. This included steep 1H:4V slope segments with a mid-slope planting bench. PYRAWALL combines High Performance Turf Reinforcement Mat (HPTRM) with internal braces to reinforce soil mass and resist lateral earth pressures. It is also designed to encourage vegetation and is a vegetated Best Management Practice Solution for NPDES Storm Water Compliance

Native vegetation growing alongside PYRAWALL on the stream bank.

Performance

A 330 foot section of stream bank was reinforced and stabilized with 8 foot high PYRAWALL. Native vegetation quickly established providing an aesthetically pleasing solution.


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