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Conjunuse

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  • 1. GIS Based Decision Support System for Conjunctive Water Use in Irrigation Projects N.H.Rao NAARM
  • 2. GIS : art, science, engineering and technology associated with spatial patterns and processes; computer hardware and software system to collect, manage, analyze, and display spatially referenced data
    • Decision Support System: Interactive computerised tool under user control to help in making decisions ;
    • Have analytical capabilities (graphical and modelling)
    • Allow combining computer input and output with judgment
    • Are custom fit (no general package)
  • 3. Conjunctive Use
    • Integrated management of surface water and ground water resources in a region to meet specified objectives:
    • augment canal supplies
    • control water table
    • maximize production/income
    • control groundwater pollution
  • 4. f(weather, soils, water, land use economics) f (spatially variable resources, time) f(geographically referenced data, time) GIS Maps, Computers Process with Conjunctive use involves dealing with spatial patterns/processes
  • 5. Conjunctive use decisions require :
    • Tools to :
    • identify relatively homogenous spatial units over which weather, resources, land use etc. are homogenous --- GIS
    • assess recharge/unit and its spatial distribution (percolation + seepage models)
    • assess impact of recharge and pumping distribution on water table (groundwater flow model)
    • identify suitable conjunctive use strategy (simulation, optimization)
  • 6. USER Decisions Problem situation Input Information Decision Support System Knowledge/ Expert system Data Models Reports GIS GIS based DSS for conjunctive use