Moderate Geographic Extent of Increased Level of Protection Alternative
Under Alternative 2, the District would build approximately 20 miles of new or improved facilities to meet the 500-year level of protection. This would include 17 miles of existing PL 84-99 Program levees and approximately 3 miles of new levees. Under Alternative 2, the District would also implement all of the Interim SWIF-identified capital projects. Agricultural areas would be provided the same level of protection as they currently have. Some agricultural drainage improvements and flood-proofing may be required to maintain the current level of protection. Under Alternative 2, the District would implement all of the Interim SWIF identified capital projects, those included in the No Action Alternative as well as those currently unfunded. Alternative 2 would include maintenance on other non-PL 84-99 levees and revetments. The District anticipates that this alternative would require limited real estate easements and relocations.
New levees would be constructed in the following areas:
Shoreline gaps on the right bank of the Lower Green River between PL 84-99 Program levees in Kent and Tukwila (approximately 2 miles).
The left bank of the Lower Green River in Tukwila (approximately 0.6 mile).
The left bank of the Lower Green River in Auburn (approximately 0.5 mile).
Alternative 2 would include the construction of the following new or improved facilities:
Type A facility: approximately 10.17 miles (50 percent of the facilities).
Type B facility: approximately 4.68 miles (23 percent of the facilities).
Type C facility: approximately 5.41 miles (27 percent of the facilities).
Alternative 2 would not include any Type D facility projects, except where needed to maintain the current level of protection.
The map above shows the potential locations of facility types under Alternative 2 (click to enlarge).