To be Submitted to Journal of Climate, 2003 1 Dynamic Water Allocation Framework for Multiple Uses II: Performance under Climate Information Based Reservoir Inflow Forecasts A.Sankarasubramanian 1 , Upmanu Lall 1, 2 , Ashish Sharma 3 and João Lucas 2 1 International Research Institute for Climate Prediction, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964 - USA e-mail: sankar@iri.columbia.edu 2 Department of Earth and Environmental Engineering, Columbia University, New York 10027. e-mail:ula2@columbia.edu 3 School of Civil and Environmental Engineering, The University of New South Wales, Sydney, Australia. e-mail: a.sharma@unsw.edu.au ABSTRACT A dynamic water allocation framework for a multipurpose, single reservoir is formulated to utilize climate information based reservoir inflow forecasts to quantify the reliability of supply for each use. Based on the semi-parametric approach of De Souza and Lall [2003], 12 months lead retrospective reservoir inflow forecasts were developed for the period 1949-1995 for the Oros reservoir utilizing the climatic conditions available up to June of that year. These retrospective forecasts were utilized for both single purpose and multipurpose water allocation from the Oros reservoir to assess the utility of climate forecasts over the climatological approach and the currently pursued strategy of Zero inflow assumption. Under single purpose water allocation experiment, the behavior of the Oros reservoir is modified to a within-year storage system by forcing the annual demand to be unbounded. The main purpose of this assumption is to understand the performance of the reservoir in terms of resilience, reliability and vulnerability indices suggested by Hashimoto et al., [1982]. Results from this exercise suggest that