Use of hydrographs to survey subsurface drainage: Networks ageing and hydraulic operating

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Abstract
As a result of new concerns about subsurface drainage (networks ageing, hydraulic and hydrological operating), several methods have been developed to analyse continuously recorded field drainage experimental data. This paper presents these methods and their results, illustrated by surveys of some field drainage experiments located on various shallow temporarily waterlogged soils, three of them having been monitored during eight years. Annual and interannual hydrological performance of drainage is studied by double-mass method. It highlights drainage seasons, enables a comparison between different kinds of layouts on a given soil, shows the contrasts in hydraulic behaviour between different soils and illustrates the drainage network performance particularly under tilled conditions. A statistical study of both maximum flow rates with different return periods and durations of given flow rates is conducted. This analysis of high flow rates is of practical interest for the choice of drainage design rates with different allowable surcharge duration.

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