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Subject: Agriculture × Author: Deshpande, Girish B × Type: Thesis ×
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    ThesisItemOpen Access
    STUDIES ON PERFORMANCE OF SUBSURFACE DRAINAGE SYSTEMS OF PHASE-1 AREA UNDER INDO-DUTCH NETWORK PROJECT IN UPPER KRISHNA PROJECT COMMAND
    (UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, DHARWAD, 2003) Deshpande, Girish B; Balakrishnan, P
    "The investigations were carried out during November, 1998 - May, 1999 on the evaluation of both the pipe and open subsurface drains (SSDs) executed in 14.90 ha out of 180 ha in the ORP area in Islampur - Devapur (J) villages under Phase-I work of Indo-Dutch Network Operational Research Project on "" Drainage and Water Management for Salinity Control in Canal Commands "" in Upper Krishna Project area and to compare them for their suitability in the area. The SSD works were undertaken by the above project in Agricultural Research Station, Bheemarayangudi for the reclamation of waterlogged saline area during 1998 summer. The monitoring of drainage systems revealed that the average weekly and monthly weighted average discharges of the pipe SSDs were 15.89 and 17.12 per cent higher than that of the open SSDs. indicating slightly a better performance in removing the excess water from the study area. There exists a positive correlation between the NLBC flow depth and the weighted average drain discharge and it was more pronounced in case of open SSDs (r = 0.751) than the pipe SSDs (r = 0.473). The estimates of the areal hydraulic conductivity indicate that the flow was predominantly from below the drain level. Also, the areal values were much (nearly 16 to 21 times) higher than the point measurements of hydraulic conductivity which are in line with the findings of the earlier researchers. The performance of both types of drains was inadequate in controlling the water table due to wider spacing (50 m) in the study area. Compared to mid-drain spacing, the leaching of salts was more efficient at quarter-drain spacing in both the systems. Further, the pipe SSDs system was found to be comparatively more effective in leaching of salts and the change in soil reaction was insignificant implying the inefficiency of SSD system alone in reducing soil pHs without amendments. Further, the improvement in leachate quality in pipe SSD system was slightly better than the open SSD system and hence the leachate could be reused for irrigation in the study area. After the execution of drainage works, though the response of the farmers for taking up cultivation of crops was slow initially, it is expected that the cropping intensity would increase in the years to come because of the improvement in the land conditions."