When using the finite-element method to calculate the seepage fields with drainage wells

we adjusted the well boundary to reduce the total unit number and improve the element adjacency. Two methods were examined in this paper

one is to transform the circular well into an equivalent regular polygon

another is to transform one well into equivalent multiple n well elements possessing different permeability coefficients but same effects. The second method was first raised by Li Zu-yi (1984). For the well’s elements with tetrahedral shape

according to theoretical analysis，the reduced coefficient of areas from which flow quantity is calculated

is raised from 1/4 suggested by Li Zu-yi to 1/3 in this paper. The numerical solutions of all examples calculated by different well’s treating methods are compared with the theoretical results. By doing this the data may be chosen with better performance and less bias