Laboratory and Field Determined Seepage (
by P. C. M. Reid, Dep of Water Affairs, South Africa,
D. C. R. Davidson, Dep of Water Affairs, South Africa,
M. Grift, Dep of Water Affairs, South Africa,
Abstract: In order to obtain quick and reliable estimates of seepage, an attempt was made to establish a relationship between one or more of the properties of concrete canal lining and seepage. 75 mm diameter concrete core samples were taken at various sites on a number of irrigation projects at which seepage ponding test results were already available. As a first approximation 'laboratory' determined core permeability was compared to ponding test seepage results. A very good relationship between these two parameters was found. Definite relationships between permeability and porosity; porosity and strength; porosity and density were found. As core strength and density are relatively easily and quickly determined, these parameters are now used to estimate the rate of seepage in concrete lined canals.
Subject Headings: Seepage | Laboratory tests | Canals | Permeability (material) | Porosity | Fluid flow | Porous media flow
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