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WEAP (theWater Evaluation and Adaptation Planning system) is a model-building tool forwater resource planning and policy analysis[1] that is distributed at no charge to non-profit, academic, and governmental organizations in developing countries.
WEAP is used to createsimulations ofwater demand,supply, runoff,evapotranspiration, water allocation,infiltration,crop irrigation requirements, instream flow requirements,ecosystem services, groundwater and surface storage,reservoir operations, pollution generation, treatment, discharge, and instreamwater quality. The simulations can be created under scenarios of varying policy,hydrology, climate, land use, technology, and socio-economic factors.[2] WEAP links to theUSGS MODFLOW groundwater flow model and the US EPA QUAL2K surface water quality model.
WEAP was created in 1988 and continues to be developed and supported by the U.S. center of theStockholm Environment Institute, a non-profit research institute based atTufts University inSomerville, Massachusetts. It is used forclimate change vulnerability studies andadaptation planning and has been applied by researchers and planners in thousands of organizations worldwide.
Establishing the ‘current accounts’ and building scenarios and evaluating the scenarios about criteria are the main WEAP applications inSimulation problems.[3]