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