Download - Conjunuse
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GIS Based Decision Support System for Conjunctive Water
Use in Irrigation Projects
N.H.Rao
NAARM
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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)
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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
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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
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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)
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USER
DecisionsProblem situation
Input Information
Decision Support System
Knowledge/ Expert system
Data Models Reports
GIS
GIS based DSS for conjunctive use