Word: riprap
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...variant on the seawall that can also hasten erosion is riprap -- rocks and boulders piled into makeshift barriers to absorb the force of incoming waves. While seawalls and riprap run parallel to the beach, groin fields extend directly out into the water. Made up of short piers of stone extending from the beach and spaced 100 yds. or so apart, they can slow erosion by trapping sand carried by crosscurrents. But down current, the lack of drifting sand can result in worse erosion. "It's like robbing Peter to pay Paul," says Leatherman -- a concept the O'Malleys of Westhampton...
Corn in Percival. The major work picked up impetus after World War II, as the Corps of Engineers divided their labors among several control systems. Dams, reservoirs, floodgates, riprap and levees were built to control the flow rate. Reforestation and soil-conservation practices decreased flood runoff. By enlarging and lining channels, removing snags and other obstructions, and by straightening bends, the engineers reduced flow resistance. Combined with local expenditures, these federal programs will eventually provide for 87 million acre-feet of flood-control storage in 219 reservoirs in the U.S., more than 9,000 miles of levees and floodwalls...
Work on a stone "riprap" to check crosion of the Charles River bank near the Weeks' Bridge, has been discontinued until spring. Soft ground has forced the cessation of this work, which was started in September. With the completion of the barrier, engineers hope to half erosion, whose steady gains of several feet yearly were threatening to undermine the foundations of the Business School...
...geologist. "Put it in a fire pot. It will run quicksilver." That is one version of the start of a current rush to mine mercury in the Ozarks. Another version is that railroad laborers exposed a valuable vein of cinnabar near Amity when they blasted out some sandstone riprap...
...engineers of the Commission have made the following calculations: earth excavation, 340,000 cubic yards; filling, 400,000 cubic yards; concrete masonry, 41,000 cubic yards; piling, 490,000 linear feet; pine lumber, 1,100,000 feet; spruce lumber, 550,000 feet; riprap, 10,000 tons. There will be two locks in the dam, the larger being 350 feet in length and 45 feet wide, and of sufficient depth to allow a vessel drawing 16 feet of water to pass through at low tide. The smaller lock will be suitable for launches and row boats. Eight sluices will be provided...
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