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Two-dimensional problem of steady seepage flow under gravity from system of parallel, identical, and equally spaced canals into semipervious clay layer underlain by freely permeable layer of sand and gravel in which piezometric heat is very near canal water level; two steps of conformal mapping are used and approximation to canal profile is adopted.

Paper discusses saturation of agricultural soil by over-irrigation or rain; downward seepage flow through porous soil to system of parallel tile drains is studied, and theory of hydrodynamics is developed for providing scientific basis for design; new spacing formula is obtained based on time variation of water table; effect of evaporation from soil surface on spacing formula.

This paper deals with the two-dimensional problem of steady seepage flow under gravity from a canal into a semi-pervious clay layer of finite thickness underlain by a freely permeable layer of sand and gravel in which the piezometric head is very near the canal water level. Two steps of conformal mapping are used and an approximation to the canal profile is adopted. In this approximation the specified canal width and depth are untouched.