The Greening of Greens
Until recently, most consulting engineers thought golf courses were fun to design, good for the portfolio, but not worthy of much serious thought. Environmental issues and competing uses...
Offshore Challenge
Standard design techniques weren't enough to create rigs for the Main Pass Mine, which, at 67 million long tons, is the largest offshore sulfur mine in U.S. history. The 18...
U.S. Sludge Digesters: From Pancakes to Eggs
Egg-shaped anaerobic sludge digesters, used extensively in Germany and Japan, cost more to build, but provide better mixing of sludge, require less maintenance and less energy to operate,...
Boston's City within a City
The Massachusetts Water Resource Authority's 11-year effort to clean up Boston Harbor is in full swing. The nerve center of the project is Deer Island, a 210 acre site that...
Waterfall Aeration Works
When they sought an alternative for instream aeration in Chicago's Calumet Waterway System, engineers at the Metropolitan Water Reclamation District of Greater Chicago (MWRDGC)...
Electrokinetic Cleanups
Electrokinetic remediation of contaminated soils is a relatively new research area. Electrokinetic phenomena can be used to create barriers, and move particles, including pollutants such...
Predicting Sediment Loads
Many reservoirs in the U.S. and internationally have experienced unforeseen storage loss when sediment loads exceed those originally predicted during the design stage. This often results...
Restricting Rockfalls
Predicting and controlling rockfalls has always been a high priority in Colorado, where many mountainous roads pass through hazardous rockfall areas with extensive and highly variable...
Perils of Point Loma
Rupture of the Point Loma sewage outfall in San Diego on Feb. 2, 1992, sent 180 mgd of primary-treated sewage coursing into shallow waters off the city's coastline. The article...
Seismic Assessment of Tailings Dams
A significant portion of the operating and closed large dams in North America are tailings dams used to impound wastes from mining operations. Often these dams were built by mine personnel...
The Caisson Solution
Detroit is expanding its wastewater treatment plant to drastically reduce combined sewer overflows. The expansion, however, is being done on an extremely congested 4 acre tract of land...
Manholes and Microtunneling
Contractors are for the Oakwood Beach Interceptor Sewer Project, on Staten Island, N.Y., were having difficulty. Glacial tills and a high water table made working 90 ft below the ground...
Landfill-Cover Conflict
Last July, EPA's Office of Research and Development (ORD), in Cincinnati held a geosynthetic clay liner (GCL) workshop to discuss the latest technology and regulations for...
Mining for Building Expansion
Engineers adapted mining techniques to tunnel under a vibration sensitive manufacturing operation to create new working space below. IBM workers needed more working space at their Vermont...
Pressure Pipeline Design for Water and Wastewater
This committee report,
Decentralized Wastewater Management
With the discovery earlier this century that city squalor caused disease, we protected ourselves by piping raw wastes away. Later, when the discharge had transformed rivers into foul,...
Soil-Pipe Interaction During Frost Heaving Around a Buried Chilled Pipeline
The freezing of soil water around a buried chilled pipeline leads to soil heaving, which is affected by the presence of the pipe. This process may eventually cause pipeline failure. The...
Thermal Strain Behaviour of Clays Cooled to Cryogenic Temperatures
The thermal expansion behaviour of two different types of clays (Boom clay from Belgium and a pure kaolinite-water paste) has been studied in a temperature range from +20? to -150?C (LNG...
Laboratory Methods for Preparing Low-Density Frozen Saline Soil Samples
Laboratory methods were developed for preparing low-density frozen saline soil samples with density values ranging from 85-110 lb/ft3. This range...
Single Pile and Pile Group in Permafrost
The results of laboratory and field experiments on single pile and pile group behaviour in frozen soils are reported. It was shown that the character of soil deformation was influenced...
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