Effect of subsurface drainage system on water table and soil hydrologic parameters at Gundur village of TBP command area

Abstract

A study was conducted to ensure the impact of subsurface drainage system on salt affected soils in the TBP command area, Karnataka. The in-situ hydraulic conductivity with average of 0.113 m d-1 before sowing, and improved slightly after the harvesting to 0.177 m d-1. The areal hydraulic conductivity values above drain level M3-between L15 and L16 laterals along M3 main drain and M4-between L11 and L12 laterals along M4 main drain at Gundur village during kharif 2015-’16 were ranged from 0.089-2.461 and 0.097-2.193 m d-1. Further, the areas estimates of K were far greater (20 to 21 times) than the in-situ measurements of K. The infiltration rate was very low due to considerable amount of clay (46-51%) and it improved slightly due to SSD system after the harvesting (4.21 mm h-1) compared to that before sowing (3.92 mm h-1).The B:C ratio, IRR and payback period were 1.37, 50 and 2 for the life span of 50 years for SSD system respectively.