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Amongst all the irrigation systems, Drip Irrigation System (DIS) offers highest application efficiency greater than 90% and it can be used for most of the crops in most of terrain. For better design, operation and control of DIS, division of field into several sub-units is best option. However, little information is available on division of field into sub-units. Sub-units are very useful in simplifying the DIS design for field as only for one sub-unit we need to design and then we can apply the same design to each and every sub-units. The objective of this study was to analyze the hydraulic results and economic results for different numbers of sub-unit on a rectangular field having area of 2 ha with two different fields one with length of 100 m and width of 200 m and other having length of 200 m and width of 100m, wherein other parameters like crop, infiltration rate, power availability, application efficiency, available discharge, temperature, evapotranspiration remains same. The study is carried out for two possibilities of source of water either at corner or at center. For hydraulic analysis head loss and head required at source is taken into consideration and for economic analysis only cost of pipes are taken into consideration because all other costs like operation cost and of cost other components remains almost same. For economic analysis laterals of LLDPE and manifold, submain and main are of PVC and HDPE material is considered.

iosr journal of agriculture and veterinary science

Determination of Best and Worst Possibilities of Sub-Units of Drip Irrigation System on a Rectangular Field Considering Hydraulic and Economic Analysis