5-Hydraulic Performance of Deep Horizontal Tile Drainage System.

Abstract

The hydraulic performance of deep tile drainage system was evaluated in saline rising water table area. The tiles were laid at a depth of 2.5 m below land surface with 24, 48 and 72 m spacings. The q vs h relationship showed curvilinear trend indicating the contribution of flow mainly from top layers and the existence of impermeable layer almost at the tile level. The variation of quality of drainage affluent was also in conformity with the above observations. The hydraulic conductivity varied between 0.3 to 0.9 m day-1. The optimum tile spacing for existing hydrogeological condition was 60-70 in.