發送短信 : Horizontal drains in residual soil slopes

             ___     _____      ______            
    ___     / _ \\  |  __ \\   /_   _//     ___   
   /   ||  / //\ \\ | |  \ ||   -| ||-     /   || 
  | [] || |  ___  ||| |__/ ||   _| ||_    | [] || 
   \__ || |_||  |_|||_____//   /_____//    \__ || 
    -|_|| `-`   `-`  -----`    `-----`      -|_|| 
     `-`                                     `-`