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|Title:||Hydraulic performance evaluation of drip irrigation system with different emission devices|
|Abstract:||Studies were conducted to evaluate the effect of operating pressure head and spacing on different hydraulic performance evaluation measures of drip irrigation systems with different emission devices. The commonly used hydraulic performance evaluation measures considered were uniformity coefficient, emission uniformity, coefficient of variation and coefficient of manufacturing variation. The different emission devices were dripper, micro-tube, drip-in and drip tape. The experiments were conducted in the field laboratory of Soil and Water Engineering Department, College of Agricultural Engineering and Technology, CCS Haryana Agricultural University, Hisar. The selected spacings were i) 6m x 6m, 1m x 6m and 0.5m x 0.5m for dripper and micro-tube, ii) 6m x 0.6m, 1m x 0.6m and 0.5m x 0.6m for drip-in and iii) 6m x 0.3m, 1m x 0.3m and 0.5m x 0.3m for drip tape. The operating pressure heads were 5m, 10m and 13m. The measurement of discharge for calculation of hydraulic performance evaluation measures was done by operating the system and putting the containers at 6m interval along the lateral lines. The measurement of pressure head was done with the help of mercury manometer and water manometer at up stream and down stream end of main line and lateral line. The values of different hydraulic performance evaluation measures and head loss in main line and lateral line were calculated. The values of uniformity coefficient and emission uniformity decreased for dripper and micro-tube and increased for drip-in and rip tape, as the spacing decreased. The values of uniformity coefficient and emission uniformity for all emission devices increased as the operating pressure head increased at a particular spacing. The values of coefficient of variation increased for dripper and micro-tube and decreased for drip-in and drip tape, as the spacing decreased. The values of coefficient of variation for all emission devices decreased as the operating pressure head increased at a particular spacing. The values of coefficient of manufacturing variation was maximum for drip tape and minimum for micro-tube. The values of head loss in main line and lateral line for different emission devices increased as the spacing decreased and increased as the operating pressure head increased. The head loss in the main line and lateral line also increased at a decreasing rate with discharge and the variation can be expressed with a power equation. The values of the coefficients in the power relationship between head loss and discharge were calculated for each emission device and also combined for all emission devices. The coefficient of correlation for the combined equation was 0.9871 for main line and 0.7201 for lateral line. A computer software in C++ language was developed for calculation of the hydraulic performance evaluation measures and head loss in main line and lateral line of system. The values obtained from the computer software were equal to the measured values.|
|Subject:||Soil and Water Engineering|
|Appears in Collections:||Theses|
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|CCSHAU-290519-Sandeep Kumar.pdf||Hydraulic performance evaluation of drip irrigation system with different emission devices||11.28 MB||Adobe PDF||View/Open|
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