LARGE-SCALE MODEL STUDIES OF HIGHWAY SUBDRAINAGE

PREVIOUS MISCONCEPTIONS CONCERNING SUBDRAINAGE ARE DISCUSSED, AND THE THEORETICAL BACKGROUND OF THE PROBLEM IS REVIEWED. THE DESIRABILITY IS SHOWN OF COMPARING DIFFERENT SOIL TYPES ON THE BASIS OF THE RATE AT WHICH GROUNDWATER IS LOWERED. THE USE OF LARGE SCALE MODELS WAS SELECTED AS THE BEST MEANS FOR OBTAINING THE DESIRED INFORMATION. A MODEL LAW WAS DERIVED WHICH PERMITTED EXTENSION OF THE RESULTS TO ANY OTHER SCALE AND ANY OTHER SOIL TYPE WITHIN CERTAIN LIMITATIONS. THE EFFECTS OF SOIL TYPE, DRAIN DEPTH, DRAIN SPACING, AND DRAIN SIZE UPON THE RATE AT WHICH THE GROUNDWATER IS LOWERED AND UPON THE RATE OF DISCHARGE INTO THE DRAIN ARE SHOWN. /AUTHOR/