Staged Emergency Spillway Development – Design Considerations

Staged Emergency Spillway Development – Design Considerations

Author: K.L Ainsley, B. Otis, E. Chong
Conference: 87th Annual Meeting of the International Commission on Large Dams
Date: June 9-14, 2019

ABSTRACT
Under most circumstances, spillway structures are required for the safe operation of a dam, helping to control the release of excess water within the impoundment to a location downstream. Where spillway facilities exist, it is essential that they are capable of operating throughout their design life and within prescribed regulatory requirements. This condition becomes more challenging when an emergency spillway needs to be incorporated into the design of a tailings storage facility (TSF). TSFs are typically designed for the final arrangement anticipated at mine closure. In order to reduce mine operating capital costs, TSFs are often constructed in staged lifts as dictated by tailings production estimates. Consideration for the spillway is required with each lift. Several factors influence the dam and spillway geometry including supernatant pond volumes, climatic conditions, tailings production rates, volumetrics of the impoundment, spillway location, geotechnical considerations, mine closure criteria. This paper will explore the key considerations for the development of a TSF emergency spillway. The spillway development at the Phu Kham Copper-Gold Operation (operated by Phu Bia Mining Limited) located in the Lao People’s Democratic Republic will be used to illustrate these considerations.

 

Download the full technical paper.

Download

Recent Insights

November 2021
Knight Piésold's Projects Commended at Prestigious Awards
November 2021
Engineer of Record Services for Tailings Facilities
November 2021
Gearing Up for Growth in Zambia
October 2021
Knight Piésold, aliado de la minería sustentable
September 2021
Knight Piésold Chile enfoque personalizado e integral de trabajo al estilo boutique
September 2021
Company Uses Innovative Ideas in Municipal Project
August 2021
South Africa Must Focus on STEM Skills to Enable Development
July 2021
Business Success Stories: Knight Piésold
July 2021
Holistic Approach to Mine and Industrial Water Management
July 2021
Selection of Undrained Shear Strength Parameters of Residual Soils and their Application in Stability Analysis
June 2021
Knight Piésold Focused on Africa's Infrastructure Development
June 2021
Century-old Knight Piésold Remains Committed to Clients and Communities in Phalaborwa
May 2021
Very Few Consulting Firms Reach 100 Years – Knight Piésold Celebrates with Optimism
April 2021
Knight Piésold Celebrates 100 Years of Excellence in Africa
April 2021
Video: Knight Piésold Celebrates 100 Years of Engineering Excellence
April 2021
Opportunities Abound to Support Africa's Resilient Growth - Knight Pièsold
April 2021
Firm Expands Service Offering
March 2021
Celebrating 100 Years of Engineering Excellence
February 2021
Improved Tailings Disposal Could Reduce Water Use
January 2021
Your Community, Your Neighbour