Water management for Mosaic systems

  • Water allocation in modern irrigation systems is typically handled by the irrigation department based on the needs of cultivated land under each irrigation canal.
  • A successful pilot project called the 'Bulk Water Allocation' system treated an irrigation canal as a tank and enabled management by the farmer association, showcasing a unique approach.
  • The success of this water management practice suggests that it could be a viable methodology to be implemented in Mosaic Systems.

Bulk Water Allocation System (BWA)

The Bulk Water Allocation (BWA) system was introduced as a pilot project in the area to address water management challenges in the Mahaweli H system. It proved to be an effective and reliable solution. The system operates at the level of Field Canal Groups, led by elected leaders. The structure of this water management system is depicted in the provided figure.

water managmnt
Management structure of system H in implementing BWA
  • Transparent and systematic decision-making and information flow is facilitated in the Mahaweli H system, allowing for proper functioning of the entire system. Unresolved issues are addressed in Project Level Committee Meetings held every two months.
  • Pre-season meetings provide an opportunity for farmers to propose their cultivation plans, which are then negotiated and discussed with local officers to develop a reasonable plan.
  • The Jalapalaka or water master plays a crucial role in water distribution, simulating a water-storing tank where the availability of water is determined at the beginning of the season and any withdrawals or deposits impact future availability.
  • The dry season cultivation area has increased by 52%, leading to a 10.7% increase in annual cropping intensity. Crop diversification is a key focus, particularly in tail end areas, which comprise 60% of total farmers.