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AbstractBetween 4 and 7 February 1990, exceptionally high river flows on the River Tay resulted in widespread flooding of land and property. Roads and railway lines were rendered impassable, and villages and farms were isolated for a prolonged period. In the Tay Valley, 42 km of flood banks were overtopped and 34 km2 of land were inundated.This paper describes the extent and effects of the flooding and reviews the relevance of various factors in terms of their likely contribution to the magnitude of flooding. Flood‐mitigation measures are discussed with particular attention being given to the implementation of a flood‐warning system for the Tay Valley.

ABSTRACTThis paper describes a hydrodynamic mathematical‐modelling study to investigate the flooding problem and to recommend various flood‐alleviation measures for the White Cart Water on the southern side of Glasgow. The mathematical model covers 36 km of the White Cart to the tidal reaches at the confluence with the River Clyde, and includes 7 km of one of the major tributaries where regular flooding is also a problem. A key aspect of the study was the close proximity of the modelling team which permitted a close scrutiny of the river during high‐flow events. From these observations the team obtained a thorough appreciation of river behaviour during potential flood situations, which provided a reliable and comprehensive set of data for model calibration over a wide range of conditions. The proposals for flood alleviation have far‐reaching implications and require major capital expenditure. At present they are being examined by Strathclyde Regional Council in consultation with the many interested parties.