WARABANDI AND ROTATIONAL IRRIGATION SYSTEM/ MICRO IRRIGATION<br /><ul><li>INTRO ABOUT WARABANDI SYSTEM</li></ul>The system requires minimum interference by the system managers.It provides enough scope to the farmers to make intelligent decisions to optimize water productivity. Judicious use of water resources is sine qua non (prerequisite) for enhanced productivity, improved economy and health of the environment & of critical importance when water supply is scarce.Warabandi needs to be understood as a composite sociotechnical system comprising a physical infrastructure and a corresponding institutional arrangement for rationing and sharing water.<br />WARABANDI is a rotational method for distribution of irrigation water, with fixed time allocations based on the size of landholdings of individual water users within a watercourse command area.The primary objective of the method is to distribute this restricted supply in an equitable manner over a large command area.Management of available water resources in an irrigation system has got its utmost importance so as to make it available to its potential users, i.e. farmers, most judiciously and equitably."WARABANDI" is a most appropriate, suitable, and successful method of irrigation water distribution below outlet to maintain equity and rightfulness among the users and make best and economical use of available water potential. <br />PROBLEMS RELATED WITH WARABANDI<br />Since independence, the system has been deteriorating due to the lack of maintenance, corruption and mismanagement. <br />Majority of the budget devoted to water management system goes to the huge administrative structure while only a small portion is used to maintain and repair it. <br />As a result the system is unable to hold the needs of today’s irrigation needs for a fast growing population.<br />Canal irrigation in warabandi<br /><ul><li>ROTATIONAL IRRIGATION SYSTEM
It is designed to deliver a constant flow of water among irrigators along a tertiary canal. A constant time per unit irrigated area is allocated to all the farmers regardless of their location along the canal. These results in decreasing volumes of water delivered to downstream farmers. A variable time model is developed which allocates more time to the downstream farmers to deliver a constant volume of water per unit area to all the farmers in the command area of a tertiary unit.
India is a large producer of agricultural products. Irrigation resources are limited & the water-use-efficiency as well as agricultural productivity is low.
Micro irrigation (MIS) which is the most efficient method of irrigation was introduced in 1987. MIS has become popular in India & it has been adopted on 400,000 ha. The integrated approach evolved by JAIN IRRIGATION (JISL) & the support provide ny various Govt. & other agencies are the main factors for the rapid growth of micro-irrigation in India.
For successful implementation of MIS, numerous technical services such as land survey, water & soil analysis, climatological data, design, availability of high quality components, installation, extension & training of farmers as well as after sales customer services, etc. are necessary.
It is the delivery of water at low flow rates through various types of water applicators by a distribution system located on the soil surface, beneath the surface, or suspended above the ground. Water is applied as drops, tiny streams, or spray, through emitters, sprayers, or porous tubing.
Plastic(polythene)</li></ul>Supply water to emitters (sometimes “emitters” are part of laterals itself)<br /><ul><li>APPLICATOR HYDRAULICS</li></ul>Need pressure in pipelines to distribute water through the system, but the applicator need to dissipate that pressure.<br />Where,<br />qe = emitter discharge<br />K = emitter discharge coefficient<br />H = pressure head at the emitter<br />X = emitter discharge exponent (varies with emitter type)<br />TYPES OF MIS<br />Surface trickle (drip)<br />Water applied through small emitter openings to the soil surface (normally less than 3 gal/hr. per emitter)<br />Spray<br /> Water applied to the soil surface at low pressure(less than about 1 gal/min/spray applicator)<br />Subsurface trickle <br />Water applied through small emitter openings below the soil surface.<br />THANK YOU<br />BY- NISHANT SOURABH<br />BTE-08-031<br />