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DSD-SEA 2018 RIBASIM Applied For Subak Irrigation Schemes In Yeh Ho River Basin Bali - Infantri Yekti

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Presentation by Mrs. Dr. Mawiti Infantri Yekti, ST, MT (Civil Engineering Faculty of Udayana University, Indonesia)) at the Seminar Cutting Edge Hydro Software for South-East Asia, during the Deltares Software Days South-East Asia 2018. Thursday, 6 September 2018, Yogyakarta.

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DSD-SEA 2018 RIBASIM Applied For Subak Irrigation Schemes In Yeh Ho River Basin Bali - Infantri Yekti

  1. 1. RIBASIM APPLIED FOR SUBAK IRRIGATION SCHEMES INVITED SPEAKER: Dr. MAWITI INFANTRI YEKTI “DeltarEs Software Days South-East AsiA” Yogyakarta, 6 – 8 September 2018
  2. 2. YEH HO RIVER BASIN AND SUBAK IRRIGATION SCHEMES
  3. 3. SUBAK, TRI HITA KARANA, AND HIERARCHY SUBAK TEMPLES BESAKIH TEMPLE LAKE (ULUN DANU) TEMPLE BATU KARU TEMPLE TANAH LOT TEMPLE WEIR TEMPLE BOX TEMPLE WDU TEMPLE
  4. 4. MANAGED FLOW IN SUBAK PADDY TERRACES CHARACTERISTIC PADDY TERRACES MANAGED FLOW MODELAPPROACH Objectives managed flow: 1. irrigation 2. domestic need Assess other feasibilities: - water treatment plan - micro hydro Develop full stakeholder involvement and technical expertise Define managed flow options - river basin area - hydrologic analysis - river characteristics - flow regime - reservoir dam characteristics - minimizing rapid surface irrigation water - mitigation of soil erosion - reduce landslides Land/soil conservation - maximise yield - reduce pest - mitigate social conflict Bali Water Temple Cropping pattern Indigenous water management (Subak association) Sustainable indigenous paddy terrace Tri Hita Karana philosophy Select the best managed flow by simulation Operation of managed flow in hydraulic structure of dam Start Socio-agriculturalPhysical Monitoring and evaluation of operation Paddy terraces End Yes No Subak association
  5. 5. PARTICIPATORY IRRIGATION MANAGEMENT (PIM) PIM In socio culture and economics of agriculture PIM In light of a religious community PIM In irrigation system operation and maintenance
  6. 6. PROBLEMS IN YEH HO RIVER BASIN To increase irrigation water supply in Yeh Ho River Basin Process of water sharing was changed (among farmers)  To develop an optimal reservoir operation strategy based on operation of the Subak irrigation schemes and capable to support agricultural productivity at upstream, midstream, and downstream level
  7. 7. HYDROLOGY, HYDRAULIC, AND SUBAK SCHEMES APPROACH Soil samples To determine type and characteristics of soils Third aspect of the Tri Hita Karana A closed paddy terraces block with inlets and outlets: (1) Every paddy block of one farmer has one inlet and one outlet; (2) Boundaries of the Subak schemes are naturally clear Data on agriculture production Subak Caguh upstream and Subak Meliling downstream Fieldwork On water sources and hydraulic structures
  8. 8. SCHEME OBSERVATION BLOCK INLET BY QUARTERNARY BOX OUTLET FROM PADDY TERRACES BLOCK QUARTERARY 1 AND 2 DRAIN 1 AND 2
  9. 9. IRRIGATION-DRAINAGE OF SUBAK WATER DISTRIBUTION UNIT (WDU) DRAINAGE SYSTEM OF RECEIVING WATER BODY, RECOVERABLE FLOW FOR IRRIGATION DOWNSTREAM INTERMITTENT IRRIGATION
  10. 10. RESULT IRRIGATION-DRAINAGE Outlet provide recoverable flow Maximum = 83 % Average = 62 % Minimum = 21 %
  11. 11. SOIL CHARACTERISTICS Silty clay With medium until high plasticity and brown to yellowish colours Subak farmers TO irrigate For saturation of root zone before land preparation, which requires a large amount of water
  12. 12. MODEL AND SCENARIO ANALYSIS Reduced availability of water for irrigation from upstream sources and from the river River basin simulation uses dependable 80 % of discharge Optimisation based on shifting 15 days of start of land preparation with five scenarios Recoverable flow plays an important role Two values have been applied = 62 % for average 21 % for minimum To achieve optimal production of rice in paddy terraces in
  13. 13. MODEL AND SCENARIO ANALYSIS
  14. 14. YEH HO RIVER BASIN IN RIBASIM
  15. 15. OPTIMUM RESULT CROPPING PATTERN OF THE FIFTH SCENARIO IN SUBAK AGUNG YEH HO
  16. 16. Subak Caguh in the midstream of Yeh Ho River Basin
  17. 17. WATER ALLOCATION AND AGRICULTURE PRODUCTION OF 5TH SCENARIO
  18. 18. SUMMARY SIMULATION AND OPTIMISATION In the period where availability of discharge of upstream weirs Aya and Penebel are stable Especially with respect to upstream schemes, September – October and February – March of the fifth scenario are best periods to start land preparation Is also important for allocation of water under deficit conditions
  19. 19. DISCHARGE OVER UPSTREAM WEIR
  20. 20. SUMMARY SIMULATION AND OPTIMiSATION Verification of the model with R2 main Yeh Ho Sungsang and recoverable flow Sungsang Utilisation at hydraulic structures (%)
  21. 21. EVALUATION Evaluation Role of recoverable flow is very important To compensate decreasing water of the river Shifting 15 days start of land preparation Subak farmers have ability of negotiation based on the Tri Hita Karana philosophy Based on the ratio Between actual diverted flow and target diverted flow under different scenarios the water demand in Yeh Ho River Basin was served by 60.9 – 79.0 % by Telaga Tunjung Reservoir Subak farmers make together a deal Opening and closing the irrigation water supply that only applies to the water distribution units One inlet and one outlet enforced Subak farmers To apply the principle of justice in management, which has proven to be effective Confluence flows Provide information to Subak farmers per scheme for supplying irrigation water
  22. 22. OUR PORTFOLIO
  23. 23. RIBASIM APPLIED FOR SUBAK IRRIGATION SCHEMES – IN YEH HO RIVER BASIN – “DeltarEs Software Days South-East AsiA” Yogyakarta, 6 – 8 September 2018
  24. 24. THANK YOU! SUKSEMA

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