Ordinance 3129-09 - Laserfiche WebLink

"Hard" structural stabilization measures refer to those with solid,hard surfaces, such as concrete bulkheads, while"soft" structural measures rely on softer materials, such as biotechnical vegetation measures or beach enhancement. There is a range of measures varying from hard to soft that include: • seawalls • bulkheads • retaining walls and bluff walls • concrete groins • gabions • rock revetments • gravel placement • anchor trees • beach enhancement • biotechnical measures • vegetation enhancement Generally, the harder the construction measure, the greater the impact on shoreline processes, including sediment transport, geomorphology, and biological functions. Rock, concrete and timber bulkheads result in loss of nearshore and riparian vegetation,burial of the upper beach, altered wave interaction with the shoreline, obstruction of the sediment moved along the shore by littoral currents, and indirect impacts on habitat resources for fish.l IS HEREBY AMENDED TO READ AS FOLLOWS: 6.2 Shoreline Stabilization and Flood Control Structures Shoreline stabilization includes actions taken to address erosion impacts to property and dwellings,businesses, or essential structures caused by, or associated with current, flood, tides, wind, or wave action. These actions include structural methods and nonstructural methods, such as setbacks. Structures, such as levees are used to protect land from flooding. "Hard" structural stabilization measures refer to those with solid,hard surfaces, such as concrete bulkheads, while"soft" structural measures rely on softer materials, such as biotechnical vegetation measures or beach enhancement. There is a range of measures varying from hard to soft that include: • seawalls • bulkheads • retaining walls and bluff walls • concrete groins • gabions • rock revetments 1 Shipman,Hugh. Shoreline Armoring on Puget Sound. In Puget Sound Notes No.40,March 1997. 40