Non-Destructive Excavating Around Pipelines and Challenging Conditions
Hydrovac technology provides engineers and contractors with a unique solution for non-destructive excavating around sensitive buried lines. As a non-mechanical excavating method, it is...

Draining in a New Direction
(Available on in special edition) Wick drains can stabilize slopes and landslides by accelerating soil consolidation and settlement. But conventional wick drains, driven vertically into...

Replacement Strategy
Water Works II, a $275-million water treatment plant currently under construction in Detroit, is redefining the way that such projects are let and built. In 1980 the city initiated a program...

Water Quality Restoration of the Mammoth Cave Karst Aquifer: A Work in Progress
Over tens of thousands of years the aquatic ecosystem of the Mammoth Cave Karst Aquifer evolved in concordance with natural recharge supplied through 24,000 hectares of tall-grass prairie...

Erosion from an Industrial Forest Road in the Ouachita Mountains of Southeastern Oklahoma
Erosion from 4 segments of a 2-year old forest road in a 740 ha basin was measured for each of 105 storms that occurred in a 3.5 year period. Two road segments were part of a mid-slope...

Probabilistic Simplified and Detailed Subsurface Drainage Water Quality Modeling of Nitrate Leaching
A transparent uncertainty structure is derived for simplified and detailed conceptual nitrate leaching as a result of a probabilistic modelling procedure. The uncertainty structure consists...

Rediscovering the Lost City
Since 1994, Kenneth R. Wright, P.E., of Wright Water Engineers, in Denver, has been studying evidence of civil engineering at the ruins of Machu Picchu—an ancient Inca city in the Andes...

Hazard and Resource Considerations in Site Development in Virginia Karst

Ground Improvement in Zárate

Redesigning the San Roque Dam
Engineers updated a 20-year-old design for the San Roque Dam in the Philippines to save time and money and improve the dam's ability to withstand earthquakes. The structure...

Piece by Piece
The Lions' Gate Suspension Bridge, a landmark structure in Vancouver, British Columbia, marks the entrance to one of the busiest harbors on the west coast of North America....

Subirrigation: Water Table Management
Water table management (subirrigation) is accomplished by controlling the water table, usually through a subsurface drainage system. The crop is subirrigated with water being furnished...

Safety in a Designer's Hands
Although contractors face safety issues every day, engineers and architects have traditionally not addressed construction site safety in project designs. But there are design practices...

Potential Effects of San Mining and Debris Basins on Coastal Sediment Supply in Los Angeles County
The potential sediment supply to the coast in Los Angeles has been heavily impacted by human activity. In the context of rational management of beaches as a resource, it is fundamental...

The New Orleans Network
Though Seattle and Portland are the cities usually associated with high rainfall, the New Orleans metropolitan area averages 58 in. (1,473 mm) of rainfall each year—more than any other...

Beach Town Cleanup
The Avila Beach remediation project in California required the demolition of numerous structures and part of the beach in order to remove more than 200,000 cu yd (153,000 m³) of contaminated...

Subsurface Information for Construction Contracts - Impacts on the Geoprofessional Community

Successful Implementation of Grouted Boulder Grade Control Structures on Drainageways in the Denver Metropolitan Area

Wetlands Treat Mine Runoff
Engineers were asked to design a treatment system for the severely acidic drainage from the Mike Horse and Anaconda metals mines in Montana. Challenges included the mountainous terrain,...

Betting on the Baseline (Available in Geoenvironmental Special Issue only)
In construction contracts, new deductive differing site conditions (DSC) clauses provide for credits to owners when contractors encounter better-than-anticipated subsurface conditions....

 

 

 

 

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