Search Results: “” — Page 5

P.W. Heinrichs and R. Fell

Ben Boyd Dam, a 29 m high earthfill embankment built in 1978, has had an unusual history. In 1979, a number of seeps developed during first filling with water 5 m below FSL indicating unexpectedly high pressures. Investigations concluded the coarse filter permeability was very low due to excess fines. Remedial works in 1982 included a drainage filter beyond the toe and a new stability berm above. New piezometers were installed, including several in the blanket filters in the existing dam. These later indicated up to 10.5 m head in isolated areas within the filter. Pump out tests partially lowered the water level in the standpipes but in 1995 the water level rose by 4 m back to its previous high level. All this during a period of relatively low rainfall. Stability analyses were carried out and further investigations in 1999 concluded that apart from general leakage from the foundation abutment into the filters, the rise in pressures was due to leakage from a riser hole from one of the nearby foundation piezometers. A potential for piping along the piezometer tubes within the dam was also identified.

This situation was managed without resort to costly capital works, because it was concluded that the pressures from the vertical riser were not a potential failure mode, and potential piping failure would be adequately handled by the existing chimney drain, intersecting the piezometer tubes trench. Any potential piping failure would also give warning signs which increased frequency of monitoring (now in place) would pick up in time to allow lowering of the storage.

Now showing 49–60 of 1154 search results:

  • $15.00
    2000  Papers

    2000 – Ben Boyd Dam: A Case Study in Incident Management

    Learn more
    Learn more
  • $15.00
    2000  Papers

    2000 – Capping of Very Low Strength Tailings Using Woven Geotextile and Geosynthetic Clay Liner

    Learn more
    Learn more
  • $15.00
    2000  Papers

    2000 – Dam Remedial Works in Western Australia

    Learn more
    Learn more
  • $15.00
    2000  Papers

    2000 – Dam Technology in Australia 1850-1999 – Creating the Book

    Learn more
    Learn more
  • $15.00
    2000  Papers

    2000 – Development in Non-Linear Finite Element Analysis for Dam Safety Management

    Learn more
    Learn more
  • $15.00
    2000  Papers

    2000 – Development of a Comprehensive Approach to Consequence Assessment

    Learn more
    Learn more
  • $15.00
    2000  Papers

    2000 – Embankment Dam Rehabilitation with Granular Filters

    Learn more
    Learn more
  • $15.00
    2000  Papers

    2000 – Environmental Challenges in Constructing the Warragamba Dam Auxiliary Spillway

    Learn more
    Learn more
  • $15.00
    2000  Papers

    2000 – Grahamstown Dam Stage 2 Augmentation Selection and Design of a Labyrinth Spillway and Baffle Chute

    Learn more
    Learn more
  • $15.00
    2000  Papers

    2000 – Harvey Dam Environmental Management

    Learn more
    Learn more
  • $15.00
    2000  Papers

    2000 – Hume Dam Rehabilitation – An Owner’s Perspective

    Learn more
    Learn more
  • $15.00
    2000  Papers

    2000 – It’s More Fun When You Do It Yourself – Constructing the Lake Eppalock Main Embankment Remedial Works Project

    Learn more
    Learn more
  • $15.00
    2000  Papers

    2000 – Lyell Dam Rubber Dam Incidents

    Learn more
    Learn more
  • $15.00
    2000  Papers

    2000 – Mitigating Cold Water Pollution Below Dams

    Learn more
    Learn more
  • $15.00
    2000  Papers

    2000 – Protecting Environment Flows While Catering for Urban Water Supply Demand – The Cowarra Off-Creek Dam Experience

    Learn more
    Learn more
  • $15.00
    2000  Papers

    2000 – Revising the Method for Estimating Probable Maximum Precipitation in Tropical Australia

    Learn more
    Learn more