By A Roos, D Cameron-Ellis, HJ Wright, ARQ Consulting Engineers (Ltd) Pty. Dams and Hydro, Pretoria, South Africa. Discharge over an ogee crested gravity dam ultimately flows as a uniform sheet at the toe of the dam from where a stilling basin, roller bucket of similar energy dissipation structure serves to manage residual energy and safely return […]
By SD Anderson, DG Cameron-Ellis, HJ Wright ARQ Pty (Ltd), Dams and Hydro, Pretoria, South Africa. Stephen received third place for best youth publication and presentation at the 2017 SANCOLD conference. The basic principle behind standardised hydraulic jump energy dissipation structures, e.g. the USBR Type III Stilling Basin, is to reduce the length of the hydraulic jump […]
A field investigation was conducted for the proposed raising of Tzaneen Dam, a composite earth fill embankment dam. This paper describes the part of the investigation that focused on the inclined clay core of the dam. The sensitive nature of the clay core did not permit conventional rotary core drilling to be employed as this could potentially cause hydraulic fracturing of the core resulting in leaking, internal erosion and ultimately failure of the dam.
In this paper the author describes the peculiar constraints prevalent in the development of infrastructure in remote locations in Africa and the specific challenges faced during the design and construction of a Hardfill dam in central Africa. In the process, the reader is introduced to a technology that is particularly appropriate for implementation on fast-track, small and medium-size hydropower projects on large rivers in remote locations.
The original 2003 ICOLD Bulletin 126 on Roller Compacted Concrete dams proved to be the most successful ICOLD bulletin to date, with the highest number of copies published and being translated into more languages than any previous ICOLD bulletin. Over the past decade or so, the number of RCC Dams in the world has essentially doubled, with approximately 700 now completed, or under construction. More importantly, some significant developments have occurred in various aspects of RCC technology for dams and to ensure that the current ICOLD bulletin reflects the state of the art, an update of Bulletin 126 was considered necessary.
Dams & Hydro
Geotech
Advanced Numerical Analysis
