A treatment of the gappy drain problem in drainage theory

Childs, 1958, The nature of the drain channel as a factor in the design of a land-drainage system, J. Soil Sci., 9, 316, 10.1111/j.1365-2389.1958.tb01923.x Youngs, 1965, A comparison of the performances of some plastic and tile drains, J. agric. Engng Res., 10, 202, 10.1016/0021-8634(65)90117-4 Kirkham, 1950, Potential flow into circumferential openings in drain tubes, J. appl. Phys., 21, 655, 10.1063/1.1699726 Youngs, 1966, Exact analysis of certain problems of ground-water flow with free surface conditions, J. Hydrology, 4, 277, 10.1016/0022-1694(66)90086-2 Youngs, 1965, Horizontal seepage through unconfined aquifers with hydraulic conductivity varying with depth, J. Hydrology, 3, 283, 10.1016/0022-1694(65)90086-7 Moulton, 1905, Current flow in rectangular conductors, Proc. Lond. math. Soc., 3, 104, 10.1112/plms/s2-3.1.104 Bowman, 1953 Childs, 1961, A study of some three-dimensional field-drainage problems, Soil Sci., 92, 15, 10.1097/00010694-196107000-00003