|Author:||Chieng, S. T.|
|Book Group Author:||NA|
A large-scale subsurface drainage research project, RAJAD, was implemented in Rajasthan, India, to combat the soil salinity induced by irrigation operations. Field data/information from twelve test sites revealed that sub-surface drainage (SSD) had positive impacts on soil salinity control. Test areas with drains installed at 30 m and 40 m spacings showed a more consistent pattern of flow rate and water table fluctuation than those with 15, 60 and 75 m spacings. Subsurface drainage flow of 120 mm over the entire monsoon season was found to be achievable, which is more than the 107 mm calculated as the requirement to maintain the salt balance in the root zone. The impact of monsoon rainfall was to reduce soil salinity at each of the drain-spacing test areas. Reclamation was faster for drain spacings less than 40 m.
|Journal:||Transactions of the 19th International Congress on Irrigationand Drainage, Beijing, China, 2005. Vol 1B: Water quality, salinitymanagement|
assessment, control, drainage, flow to drains, irrigation,leaching requirement, performance, rain, reclamation, salinity, semiaridzones, soil salinity, spacing, subsurface drainage, India, Rajasthan,South Asia, Asia, Developing Countries, Commonwealth of Nations, India,rainfall, watering, Soil Water Management (Irrigation and Drainage)(JJ800) (Revised June 2002) [formerly Soil Water Management], SoilFertility (JJ600), Soil Chemistry and Mineralogy (JJ200), Erosion; Soiland Water Conservation (PP400)