Type 3 Ruffwater Screen Turbidity Curtain Specifications
|Fabric||22 oz. vinyl coated fabric|
|Size||12 inch / 30 cm|
|Net Buoyancy||12 inch / 30 cm - 52 lb/ft / 76.8 kg/m|
|Load Carrying Components||2 each 5/16 inch galvanized steel cable, each with a break strength of 10,450 lbs., is sheathed in vinyl and seamed into the fabric one on each side of the skirt 20 inches below the flotation. These cables are shackled to the section connectors for uniform tension load transfer.|
|Breaking Strength||18,400 lb / 8,346 kg|
|Ballast||3/8 inch / 10 mm galvanized chain|
|Section Connections||Aluminum Universal Connectors, Laced Grommets, Hood and Ring Ballast Connection|
|Available Depths||3 ft to 30 ft / .91 m to 9.14 m|
|Length||100 ft / 30 m standard|
Elastec Type III Ruffwater Screen used near Golden Gate Bridge
Elastec Type III Ruffwater Screen was installed near the Golden Gate Bridge in San Francisco, CA. as part of the Crissy Field Drainage Improvement Project. Duane Bennish and Bill Andrus of the Cocoa branch were on site to help with the installation.
There was an existing drainage pipe that extended out into the water, but over time, the beach widened and the pipe was getting sediment in it and becoming blocked. It was difficult to clean out, so the remedy was to extend the outfall back out into the water.
Extension of the pipe will increase drainage capacity, reduce sand build up, and alleviate flooding issues. A “U” shape of curtain encompasses the worksite so that any disturbed sediment will not pollute the surrounding water, wildlife, and marine life. The install was high profile and was monitored by the media, California DOT, and marine biologists. Crissy Field falls under the National Park Service jurisdiction.