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Watkins, D. (1991) The hydraulic design and performance of soakaways. Technical Report. HR Wallingford.
Watkins, D. (1988) Groundwater flow beneath flood embankments - modelling procedures. Technical Report. SR169, Hydraulics Research Wallingford.
Watkins, D. (1987) Evaluation of an air-entry permeameter - for use in investigations of groundwater flow beneath flood embankments. Technical Report. Hydraulics Research Wallingford.