Bridge hydraulics by L Hamill

By L Hamill

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Nearly one-fifth of the bridge pier had disappeared. One possibility is that debris trapped on the pier altered the flow of the river, causing the scour. A void 2 m deep by 4 m long was reported at the upstream end of the pier. The structure was built in the 1880s. 1. Some general guidelines and suggestions are given below, but these are not exhaustive, and must be modified to suit a particular project: the design of a crossing of national importance over one of the world’s great rivers is not the same as constructing an access road to a few isolated properties.

M. (1985) The hydraulic performance and failure of bridges in Devon and Cornwall . Municipal Engineer, 2, August, 213–221. Highways Agency (1994) Design Manual for Roads Bridges, Vol. 1, Section 3, Part 6, BA59/94, The Design of Highway Bridges for Hydraulic Action, HMSO, London. HMSO (1975) The Reservoirs Act, Her Majesty’s Stationery Office, London. Holford, I. (1977) The Guinness Book of Weather Facts and Feats, Guinness Superlatives, Enfield, Middlesex. Inglis, C. (1949) The behaviour and control of rivers and canals.

Have river training works been added subsequently? 4) that will interfere hydraulically with the proposed crossing or vice versa? HYDROLOGICAL DATA Such as gauging station records, annual maxima, stage—discharge relationship, and flow— duration curve. These are needed to help identify the design flood and the maximum likely water level, and to plan construction work. METEOROLOGICAL DATA Rainfall depths and intensities, snowfall and snow-melt, temperature range and wind speed. These data may help in assessing the possibility of flash flood, and of ice formation and ice loading on the superstructure.

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