Channel Stability Problems Iao Stream Maui Hawaii PDF Download

The U.S. Army Engineer Committee on Channel Stabilization participated with the U.S. Army Engineer Honolulu District in a review of channel stability and levee undermining problems in Iao Stream, Maui, Hawaii. The Committee provided cost effective structural and nonstructural recommendations. Iao Stream is part of a flood control project where maintenance costs must be minimized and aesthetics and wildlife habitat are important. Any project changes to ensure protection from the Standard Project Flood must be cost effective. The Committee identified several significant natural processes that are currently adversely affecting Iao Stream. These included local scour due to flow impingement, generalized degradation, and headcutting. Geotechnical processes contributing to bank instability were also identified. Studies were recommended to better determine the relative significance of various processes. The Committee developed two conceptual designs for Iao Stream that met the project objectives of flood control and environmental enhancement.