Presentation on theme: "Management of water scarcity through micro irrigation"— Presentation transcript:
1 Management of water scarcity through micro irrigation Università degli Studi di FirenzeDipartimento di Ingegneria Agraria e ForestaleManagement of water scarcitythrough micro irrigationGraziano Ghinassi – ITAL-ICID5th Asian Regional Conference - Special session on Micro irrigation New Delhi, December 8th, 2009
2 Goals of modern on-farm irrigation Attention to water and energy (efficient use of the resources)Low (minimal) impact on environmentEconomic sustainability of farmer’s activity
3 Micro irrigation has the potential to achieve these goals Irrigation system should be:-selected according to performance and economic criteria (equipment quality, market price, …)well designed and assembledmanaged properly (i.e., working pressure, lateral length, …)
4 Farmers and micro irrigation Common idea: micro=water and energy saving per seInaccurate designModifications to the original designPoor system maintenanceUnfamiliar performanceExceeding equipment technical lifetimeComplex scheduling
5 Farmers and micro irrigation Farmers’ self-evaluation about on-farm system and practice management degree (S.E.Agr.I.T. research project):LOW: 7%;FAIR: 79%;GOOD: 14%.General excess of irrigation water (up to 160%)
6 Test and design of drip lines and system units Ve.Pro.L.G.s 2008Test and design of drip lines and system units
7 Test and design of drip lines and system units Ve.Pro.L.G.s 2008Test and design of drip lines and system units
8 SOFTWARE DATABASEVe.Pro.L.G.s 2008 is a user-friendly application software created by the National Irrigation Laboratory of the University of Pisa (Italy) and supported by ARSIA Regione Toscana.Equipped with the characteristics of about 70 drip line models, measured according to standardized laboratory test.
9 Use: test existing drip systems, compare options for Use: test existing drip systems, compare options for rehabilitation or new design, based on set performance and cost (water and energy)Input: data describing specific situations (type and position of manifold, drip lines length, field slopes, seasonal irrigation water supply, pressure at the inlet, etc..), costs (dripline, energy, …) and constraints (dripline lifetime, …)Output: driplines matching farmer requirements
32 Actual operating conditions -Lateral: LDPE PN6 Ø 20 mm-0.75 m spacing self-compensating emitters-4 l/h nominal discharge200 kPa max inlet pressure100 to 130 m length4% field slopeMeasured EU: 58%Potential EU (estimated by Ve.Pro.L.G.s)=93.3%
38 Conclusions Farmers wish for correct resources management The way drip systems operate is unsuitable to proper irrigation practice in many casesUsers can play an important role in improving system performanceVe.Pro.L.G.s 2008 software is an effective tool
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